Report of the

**Committee on** **Specifications and Tolerances**

Jack Kane, Chairman

Bureau of Weights and Measures

Department of Labor and Industry

Montana

Reference

Key Number

###### 300 INTRODUCTION

This is the final report of the Committee on Specifications and
Tolerances (S&T) (Committee) for the 89th Annual Meeting of the National
Conference on Weights and Measures (NCWM). The report is based on the
89th Interim Report offered in NCWM Publication 16, "Committee Reports,"
the Addendum Sheets issued at the Annual Meeting, and actions taken by
the membership at the Voting Session of the Annual Meeting.

Table A identifies the agenda items in the report by Reference Key
Number, Item Title, and Page Number. The item numbers are those assigned
in the Interim Meeting Agenda. Voting items are indicated with a
**"V,**" or if the item was part of the consent calendar by the suffix
**"VC"** after the item number. Items marked with an **"I"** after the
reference key numbers are information items. Items marked with a **"D"**
after the key numbers are developing issues. The developing designation
indicates an item that while it has merit, it may not be adequately
developed for action at the national level. Developing items inform
parties about issues that are developing in different localities or in
the regional associations. A developing item is returned to the
submitter to develop further before any action is taken at the national
level. The Committee withdrew items marked with a **"W."** Items marked
with a **"W"** generally will be referred to the regional weights and
measures associations because they either need additional development,
analysis, and input, or did not have sufficient Committee support to
bring them before the NCWM. Table B lists the Appendices to the report,
and Table C provides a summary of the results of the voting on the
Committee\'s items and the report in entirety.

This Report contains many recommendations to revise or amend National
Institute of Standards and Technology (NIST) Handbook 44 (HB-44),
2004 Edition, "Specifications, Tolerances, and Other Technical
Requirements for Weighing and Measuring Devices." Proposed revisions to
the handbook(s) are shown in **bold face print** by **~~striking out~~**
information to be deleted and **[underlining]{.underline}** information
to be added. Requirements that are proposed to be nonretroactive are
printed in **bold-faced *italics.***

**Note:** The policy of NIST is to use metric units of measurement in
all of its publications; however, recommendations received by the NCWM
technical committees have been printed in this publication as they were
submitted and may, therefore, contain references to inch-pound units.

**Table A**

**Index to Reference Key Items**

**Reference**

**Key Number Title of Item Page**

[300 INTRODUCTION 1](#introduction)

[310 GENERAL CODE 4](#general-code)

[310-1 I G-S.1. Identification; Built-for-Purpose Software Based
Devices, Table G-S.1. Identification, G‑S.1.1. Location of Marking
Information for Not Built For Purpose Software Based Devices, and
Appendix D; Definition of Not-Built-for-Purpose Device
4](#i-g-s.1.-identification-built-for-purpose-software-based-devices-table-g-s.1.-identification-gs.1.1.-location-of-marking-information-for-not-built-for-purpose-software-based-devices-and-appendix-d-definition-of-not-built-for-purpose-device)

[310-2 W G-N.3. Compatibility of Indicators and Weighing or Measuring
Elements
8](#w-g-n.3.-compatibility-of-indicators-and-weighing-or-measuring-elements)

[320  SCALES 9](#scales)

[320-1 V S.1.12. Manual Gross Weight Entries and UR.3.9. Use of Manual
Gross Weight Entries
9](#v-s.1.12.-manual-gross-weight-entries-and-ur.3.9.-use-of-manual-gross-weight-entries)

[320-2 W S.6.4. Railway Track Scales 11](#w-s.6.4.-railway-track-scales)

[320-3 VC Table S.6.3.a. Marking Requirements and Table S.6.3.b. Notes
for Table S.6.3.a; Note 24 Section Capacity Prefix
13](#vc-table-s.6.3.a.-marking-requirements-and-table-s.6.3.b.-notes-for-table-s.6.3.a-note-24-section-capacity-prefix)

[320-4 VC N.3.2. Field Standard Weight Carts
15](#vc-n.3.2.-field-standard-weight-carts)

[320-5 VC N.1.5. Discrimination Test 16](#vc-n.1.5.-discrimination-test)

[320-6 VC Table 3 Parameters for Accuracy Classes; Footnote 5 Grain
Hopper Scales
16](#vc-table-3-parameters-for-accuracy-classes-footnote-5-grain-hopper-scales)

[320-7 W Appendix D; Definition of Counter Scale, S.2.1.3. Scales
Equipped with an Automatic Zero-Setting Mechanism, N.1.3.1. Bench or
Counter Scales, and N.1.3.8. All Other Scales Except Crane Scales,
Hanging Scales, Hopper Scales, Wheel-Load Weighers, and Portable
Axle-Load Weighers
18](#w-appendix-d-definition-of-counter-scale-s.2.1.3.-scales-equipped-with-an-automatic-zero-setting-mechanism-n.1.3.1.-bench-or-counter-scales-and-n.1.3.8.-all-other-scales-except-crane-scales-hanging-scales-hopper-scales-wheel-load-weighers-and-portable-axle-load-weighers)

[320-8 I S.1.1. (c) Zero Indication; Requirements for Markings or
Indications for Other than Digital Zero Indications
20](#i-s.1.1.-c-zero-indication-requirements-for-markings-or-indications-for-other-than-digital-zero-indications)

[321 BELT-CONVEYOR SCALE SYSTEMS 22](#belt-conveyor-scale-systems)

[321-1 VC S.1.5. Rate of Flow Indicators and Recorders and UR.1. Use
Requirements; Operated Capacity
22](#vc-s.1.5.-rate-of-flow-indicators-and-recorders-and-ur.1.-use-requirements-operated-capacity)

[321-2 VC N.2. Conditions of Test, N.2.1. Initial Verification, N.2.2.
Subsequent Verification, and N.2.3. Minimum Test Load
23](#vc-n.2.-conditions-of-test-n.2.1.-initial-verification-n.2.2.-subsequent-verification-and-n.2.3.-minimum-test-load)

[321-3 VC N.3.1.2. Initial Stable Zero, N.3.1.3. Test of Zero Stability,
and T.1.1. Tolerance Values-Test of Zero Stability
24](#vc-n.3.1.2.-initial-stable-zero-n.3.1.3.-test-of-zero-stability-and-t.1.1.-tolerance-values-test-of-zero-stability)

[321-4 VC N.3.1.4. Check For Consistency of the Conveyor Belt Along Its
Entire Length
25](#vc-n.3.1.4.-check-for-consistency-of-the-conveyor-belt-along-its-entire-length)

[321-5 VC T.3.1.1. Effect on Zero-Load Balance
26](#vc-t.3.1.1.-effect-on-zero-load-balance)

[321-6 VC UR.2.2.(b) Conveyor Installation; Live Portions of Scale
27](#vc-ur.2.2.b-conveyor-installation-live-portions-of-scale)

[321-7 VC UR.3.2.(b) Maintenance 27](#vc-ur.3.2.b-maintenance)

[322 AUTOMATIC BULK WEIGHING SYSTEMS
28](#automatic-bulk-weighing-systems)

[322-1 I Tolerances 28](#i-tolerances)

[324 AUTOMATIC WEIGHING SYSTEMS 34](#automatic-weighing-systems)

[324-1 V Tentative Status of the Automatic Weighing Systems Code
34](#v-tentative-status-of-the-automatic-weighing-systems-code)

[330 LIQUID-MEASURING DEVICES 35](#liquid-measuring-devices)

[330-1 VC S.2.2.1. Multiple Measuring Elements With a Single Provision
for Sealing
35](#vc-s.2.2.1.-multiple-measuring-elements-with-a-single-provision-for-sealing)

[330-2 VC S.4.4.2. Location of Marking Information; Retail Motor-Fuel
Dispensers
36](#vc-s.4.4.2.-location-of-marking-information-retail-motor-fuel-dispensers)

[330-3 W Table T.2. Accuracy Classes for Liquid Measuring Devices Table
T.2. Accuracy Classes for Liquid Measuring Devices Covered in Section
3.30
38](#w-table-t.2.-accuracy-classes-for-liquid-measuring-devices-table-t.2.-accuracy-classes-for-liquid-measuring-devices-covered-in-section-3.30)

[330-4 W UR.2.5. Product Identification
39](#w-ur.2.5.-product-identification)

[330-5 VC Appendix D; Definition of Retail Device
40](#vc-appendix-d-definition-of-retail-device)

[331 VEHICLE-TANK METERS 41](#vehicle-tank-meters)

[331-1 V Recognition of Temperature Compensation
41](#v-recognition-of-temperature-compensation)

[331-2 I N.4.2. Special Tests (Except Milk-Measuring Systems), N.4.5.
Product Depletion Test, and T.5. Product Depletion Test
44](#i-n.4.2.-special-tests-except-milk-measuring-systems-n.4.5.-product-depletion-test-and-t.5.-product-depletion-test)

[331-3 I S.2.4. Zero Set-Back Interlock
47](#i-s.2.4.-zero-set-back-interlock)

[332 LPG AND ANHYDROUS AMMONIA LIQUID-MEASURING DEVICES
48](#lpg-and-anhydrous-ammonia-liquid-measuring-devices)

[332-1 W UR.2.3. Vapor-Return Line 48](#w-ur.2.3.-vapor-return-line)

[358 MULTIPLE DIMENSION MEASURING DEVICES
49](#multiple-dimension-measuring-devices)

[358-1 VC S.1.6. Customer Indications and Recorded Representations,
Table S.1.6. Required Information to be Provided by Multiple Dimension
Measuring Systems, UR.5. Customer Information Provided, and Table UR.5.
Customer Information to be Provided
49](#vc-s.1.6.-customer-indications-and-recorded-representations-table-s.1.6.-required-information-to-be-provided-by-multiple-dimension-measuring-systems-ur.5.-customer-information-provided-and-table-ur.5.-customer-information-to-be-provided)

[358-2 VC S.1.8. Indications Below Minimum and Above Maximum and Table
S.4.1.b. Notes for Table S.4.1.a.; Note 7
53](#vc-s.1.8.-indications-below-minimum-and-above-maximum-and-table-s.4.1.b.-notes-for-table-s.4.1.a.-note-7)

[358-3 VC S.3. Systems with Two or More Measuring Elements and
Definition of Measurement Field
54](#vc-s.3.-systems-with-two-or-more-measuring-elements-and-definition-of-measurement-field)

[358-4 VC N.1.4.1. Test Objects and Definition of Test Objects
56](#vc-n.1.4.1.-test-objects-and-definition-of-test-objects)

[358-5 VC T.3. Tolerance Values 57](#vc-t.3.-tolerance-values)

[358-6  VC T.5.2. Power Supply Voltage, T.5.2.1. Alternating Current
Power Supply, and T.5.2.2. Direct Current Power Supply
58](#vc-t.5.2.-power-supply-voltage-t.5.2.1.-alternating-current-power-supply-and-t.5.2.2.-direct-current-power-supply)

[358-7 VC Tentative Status of the Multiple Dimension Measuring Devices
Code
59](#vc-tentative-status-of-the-multiple-dimension-measuring-devices-code)

[360 OTHER ITEMS 60](#other-items)

[360-1 W Revise NIST Handbook 44 60](#w-revise-nist-handbook-44)

[360-2 I International Organization of Legal Metrology (OIML) Report
60](#i-international-organization-of-legal-metrology-oiml-report)

[360-3  D Developing Issues 61](#d-developing-issues)

[360-4 I Add International Terms that are Synonyms to NIST Handbook
44 Terms to Appendix D; Definitions
61](#i-add-international-terms-that-are-synonyms-to-nist-handbook-44-terms-to-appendix-d-definitions)

**Table B**

**Appendices**

**Appendix Title Page**

[A Item 360-3: Developing Issues A1](#appendixa)

[B Item 324-1: Tentative Status of the Automatic Weighing Systems Code
B1](#appendixb)

**Table C**

**Voting Results**

  ----------------- ----------------- ---------- ----------- --------- -------------
  Reference Key     House of State               House of              Results
  Number            Representatives              Delegates             

                    Yeas              Nays       Yeas        Nays      

  300 (Consent      All Yeas          No Nays    All Yeas    No Nays   Passed
  Calendar)                                                            

  320-1             35                1          34          1         Passed

  324-1             36                0          35          0         Passed

  331-1             19                15         19          14        Returned to
                                                                       Committee

  300 (Report in    All Yeas          No Nays    All Yeas    No Nays   Passed
  its Entirety                                                         
  Voice Vote)                                                          
  ----------------- ----------------- ---------- ----------- --------- -------------

**Details of all Items**

(In order by Reference Key Number)

###### 310 GENERAL CODE

####### 310-1 I G-S.1. Identification; Built-for-Purpose Software Based Devices, Table G-S.1. Identification, G‑S.1.1. Location of Marking Information for Not Built For Purpose Software Based Devices, and Appendix D; Definition of Not-Built-for-Purpose Device

**Source:** Carryover Item 310-1B.

**Recommendation:** Modify General Code paragraph G-S.1., delete
paragraph G-S.1.1., renumber paragraph G-S.1.2., add new Table G-S.1.,
and add a new definition for "not-built-for-purpose device" to Appendix
D as follows:

> **G-S.1. Identification. -** All equipment, except weights and
> separate parts necessary to the measurement process, but not having
> any metrological effect, shall be clearly marked **[in accordance with
> Table G-S.1]{.underline}.** for the purposes of identification, with
> the following information:
>
> \(a\) the name, initials, or trademark of the manufacturer or
> distributor;
>
> \(b\) a model designation that positively identifies the pattern or
> design of the device;
>
> *(c)* *the model designation shall be prefaced by the term \"Model,\"
> \"Type,\" or \"Pattern.\" These terms may be followed by the term
> \"Number\" or an abbreviation of that word. The abbreviation for the
> word \"Number\" shall, as a minimum, begin with the letter \"N\"
> (e.g., No or No.). The abbreviation for the word "Model" shall be
> "Mod" or "Mod."*
>
> *\[Nonretroactive January 1, 2003\]*
>
> (Added 2000) (Amended 2001)
>
> *\[Note: Prefix lettering may be initial capitals, all capitals or all
> lower case.\]*
>
> *(d) except for equipment with no moving or electronic component parts
> and not-built-for-purpose, **~~software~~
> [microprocessor]{.underline}**-based devices, a nonrepetitive serial
> number;*
>
> *\[Nonretroactive as of January 1, 1968\]*
>
> \(e\) for **~~not built-for-purpose, software~~
> [microprocessor]{.underline}**-based devices the current software
> version designation **[or revision number]{.underline}**;
>
> (Added 2003)
>
> *(f) the serial number shall be prefaced by words, an abbreviation, or
> a symbol, that clearly identifies the number as the required serial
> number; and*
>
> *\[Nonretroactive as of January 1, 1986\]*
>
> *(g) the serial number shall be prefaced by the words \"Serial
> Number\" or an abbreviation of that term. Abbreviations for the word
> \"Serial\" shall, as a minimum, begin with the letter \"S,\" and
> abbreviations for the word \"Number\" shall, as a minimum, begin with
> the letter \"N\" (e.g., S/N, SN, Ser. No, and S No.).*
>
> *\[Nonretroactive as of January 1, 2001\]*
>
> *(h) for devices that have an NTEP Certificate of Conformance (CC),
> the CC Number or a corresponding CC addendum number **~~shall be~~**
> prefaced by the terms \"NTEP CC,\" \"CC,\" or \"Approval.\" These
> terms may be followed by the term \"Number\" or an abbreviation of
> that word. The abbreviation for the word \"Number\" shall, as a
> minimum, begin with the letter \"N\" (e.g., No or No.).*
>
> *\[Nonretroactive as of January 1, 2003\]*
>
> The required information shall be so located that it is readily
> observable without the necessity of the disassembly of a part
> requiring the use of any means separate from the device.
>
> (Amended 1985, 1991, 1999, 2000, 2001, 2003, [and 200X]{.underline})

G-S.1.1. Location of Marking Information for Not Built-For-Purpose,
Software-Based Devices. - For not built-for-purpose, software-based
devices, the following shall apply:

> ***~~(a) the manufacturer or distributor and the model designation
> shall be continuously displayed or marked on the device (see note
> below), or~~***
>
> ***~~(b) the Certificate of Conformance (CC) Number shall be
> continuously displayed or marked on the device (see note below),
> or~~***
>
> ***~~(c) all required information in G-S.1. Identification. (a), (b),
> (c), (e), and (h) shall be continuously displayed. Alternatively, a
> clearly identified "view only" System Identification, G-S.1.
> Identification, or Weights and Measures Identification shall be
> accessible through the "Help" menu. Required information includes that
> information necessary to identify that the software in the device is
> the same type that was evaluated.~~***
>
> ***~~Note: Clear instructions for accessing the remaining required
> G-S.1. information shall be listed on the CC. Required information
> includes that information necessary to identify that the software in
> the device is the same type that was evaluated.~~***
>
> ***~~\[Nonretroactive as of January 1, 2004\]~~***
>
> **~~(Added 2003)~~**
>
> ***G‑S.1.~~2~~1. Remanufactured Devices and Remanufactured Main
> Elements. -** All remanufactured devices and remanufactured main
> elements shall be clearly and permanently marked for the purposes of
> identification with the following information:*
>
> *(a) The name, initials, or trademark of the last remanufacturer or
> distributor;*
>
> *(b) The remanufacturer\'s or distributor\'s model designation if
> different than the original model designation.*
>
> *\[Nonretroactive as of January 1, 2002\]*
>
> (Added 2001)
>
> **Note:** Definitions for "manufactured device," "repaired device,"
> and "repaired element" are also included (along with definitions for
> "remanufactured device" and "remanufactured element") in Appendix D,
> Definitions.

+-----+------------------------+------------------+------------------+
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+-----+------------------------+------------------+------------------+
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|     |                        | e]{.underline}** | e]{.underline}** |
|     |                        |                  |                  |
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|     |                        | Elements, or     | Elements, or     |
|     |                        | System           | System           |
|     |                        | s]{.underline}** | s]{.underline}** |
+-----+------------------------+------------------+------------------+
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+-----+------------------------+------------------+------------------+
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| [Re |                        | D]{.underline}** | D]{.underline}** |
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+-----+------------------------+------------------+------------------+
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| }** |                        |                  |                  |
+-----+------------------------+------------------+------------------+
| **  | **[Physically and      |                  |                  |
| [M: | permanently            |                  |                  |
| ]{. | marked]{.underline}**  |                  |                  |
| und |                        |                  |                  |
| erl |                        |                  |                  |
| ine |                        |                  |                  |
| }** |                        |                  |                  |
+-----+------------------------+------------------+------------------+
| **  | ***[Either: (1)        |                  |                  |
| [D: | displayed by accessing |                  |                  |
| ]{. | a clearly identified   |                  |                  |
| und | view only System       |                  |                  |
| erl | Identification, G-S.1. |                  |                  |
| ine | Identification, or     |                  |                  |
| }** | Weights and Measures   |                  |                  |
|     | Identification         |                  |                  |
|     | accessible through the |                  |                  |
|     | "Help" menu. Required  |                  |                  |
|     | information includes   |                  |                  |
|     | that information       |                  |                  |
|     | necessary to identify  |                  |                  |
|     | that the software in   |                  |                  |
|     | the device is the same |                  |                  |
|     | type that was          |                  |                  |
|     | evaluated, or (2)      |                  |                  |
|     | continuously           |                  |                  |
|     | displayed. Note: For   |                  |                  |
|     | revision or software   |                  |                  |
|     | version number, clear  |                  |                  |
|     | instructions for       |                  |                  |
|     | accessing this         |                  |                  |
|     | information shall be   |                  |                  |
|     | listed on the CC in    |                  |                  |
|     | lieu of the "Help"     |                  |                  |
|     | menu. Required         |                  |                  |
|     | information includes   |                  |                  |
|     | that information       |                  |                  |
|     | necessary to identify  |                  |                  |
|     | that the software in   |                  |                  |
|     | the device is the same |                  |                  |
|     | or subsequent type     |                  |                  |
|     | that was               |                  |                  |
|     | eval                   |                  |                  |
|     | uated.]{.underline}*** |                  |                  |
|     |                        |                  |                  |
|     | ***[(Nonretroactive as |                  |                  |
|     | of January             |                  |                  |
|     | 200X)]{.underline}***  |                  |                  |
+-----+------------------------+------------------+------------------+
| *   | ***[As a minimum, the  |                  |                  |
| *[N | model designation      |                  |                  |
| ote | (positively            |                  |                  |
| 1:  | identifying the        |                  |                  |
| ]{. | pattern, design, type, |                  |                  |
| und | series, generic, or    |                  |                  |
| erl | trademark designation) |                  |                  |
| ine | must be marked on the  |                  |                  |
| }** | device. If the model   |                  |                  |
|     | designation changes    |                  |                  |
|     | with differing         |                  |                  |
|     | parameters such as     |                  |                  |
|     | size, features,        |                  |                  |
|     | options, intended      |                  |                  |
|     | application, not       |                  |                  |
|     | Handbook 44 compliant, |                  |                  |
|     | construction, etc.,    |                  |                  |
|     | the specific model     |                  |                  |
|     | designation shall be   |                  |                  |
|     | physically marked or   |                  |                  |
|     | continuously displayed |                  |                  |
|     | or be capable of being |                  |                  |
|     | disp                   |                  |                  |
|     | layed.]{.underline}*** |                  |                  |
|     |                        |                  |                  |
|     | ***[(Nonretroactive as |                  |                  |
|     | of January             |                  |                  |
|     | 200X)]{.underline}***  |                  |                  |
+-----+------------------------+------------------+------------------+
| *   | ***[As a minimum,      |                  |                  |
| *[N | either the             |                  |                  |
| ote | manufacturer or        |                  |                  |
| 2:  | distributor and the    |                  |                  |
| ]{. | model designation, or  |                  |                  |
| und | the CC Number shall be |                  |                  |
| erl | continuously           |                  |                  |
| ine | displayed. Clear       |                  |                  |
| }** | instructions for       |                  |                  |
|     | accessing the          |                  |                  |
|     | remaining required     |                  |                  |
|     | G-S.1. information     |                  |                  |
|     | shall be listed on the |                  |                  |
|     | CC, which may be       |                  |                  |
|     | available as an        |                  |                  |
|     | unaltered copy of the  |                  |                  |
|     | CC printed by the      |                  |                  |
|     | device or through      |                  |                  |
|     | another on-site        |                  |                  |
|     | d                      |                  |                  |
|     | evice.]{.underline}*** |                  |                  |
|     |                        |                  |                  |
|     | ***[(Nonretroactive as |                  |                  |
|     | of January             |                  |                  |
|     | 200X)]{.underline}***  |                  |                  |
+-----+------------------------+------------------+------------------+
| **  |                        |                  |                  |
| (Ta |                        |                  |                  |
| ble |                        |                  |                  |
| Ad  |                        |                  |                  |
| ded |                        |                  |                  |
| 2   |                        |                  |                  |
| 00X |                        |                  |                  |
| )** |                        |                  |                  |
+-----+------------------------+------------------+------------------+

**Definition: [Not-built-for-purpose device. Any main device or element
which was not originally manufactured with the intent that it be used
as, or part of, a weighing or measuring device or system.]{.underline}**

**Background/Discussion:** During the 2003 NCWM Annual Meeting, the
Committee agreed to split Item 310-1, a proposal to modify paragraph
G-S.1. Identification to address software based devices, into two parts:
Item 310-1A and 310-1B. Voting Item 310-1A, a proposal to define
"built-for-purpose" software-based devices and to require the marking of
specific identification information on "not-built-for-purpose" software
based devices, was proposed for a vote and adopted.

The Committee believed that Item 310-1B, a proposal to include
"built-for-purpose" devices and to define "not-built for-purpose"
devices was not sufficiently prepared and should remain an information
item to allow for additional development. This proposal appears in the
recommendation above. Industry representatives indicated there was a
need to address both "not-built-for-purpose" software based devices and
"built-for-purpose" software based devices equally and provided the
Committee with proposed language as shown in the recommendation. Based
on the comments, regarding inequity, received the Committee kept the
proposal to modify G-S.1. to include "built-for-purpose" software based
devices an information item to allow for further review and development
by the NTETC Technical Sectors and the regional weights and measures
associations.

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) had no opposition to allowing alternate methods for
providing required identification information marking on
"built-for-purpose" software-based devices. The WWMA supported the
concept of allowing "built-for-purpose" software-based devices to
display G‑S.1. Identification information provided that the physical
identification information contains the following minimum information:
(1) manufacturer or distributor, (2) model designation, and (3) serial
number. The WWMA recommended this item remain informational until it can
be further developed.

Prior to the October 2003 NTETC Measuring Sector Meeting, the NIST NTETC
Technical Advisors developed an alternate proposal to modify G.S.1. and
add a new Table G.S.1. that provides alternate methods other than
physical markings for meeting some of the requirements of G-S.1. for
both "not-built-for-purpose" and "built-for-purpose" devices. The
alternate proposal was presented to the NTETC Measuring Sector for
consideration.

At its October 2003 Meeting, the NTETC Measuring Sector reviewed an
alternate proposal developed by the NIST Weights and Measures Division
(WMD) which presents the G-S.1. information in tabular format. The
Sector agreed with the WMD proposal in principle, but recommended some
small changes to simplify the table. The Sector forwarded the alternate
WMD proposal for G-S.1. as modified to the Southern Weights and Measures
Association (SWMA) as well as the NCWM S&T Committee.

At its October 2003 Meeting, the SWMA reviewed the proposal from the
NTETC Measuring Sector and agreed that the proposal should be forwarded
to the NCWM S&T Committee for consideration as a voting item.

At the 2004 NCWM Interim Meeting, the S&T Committee heard both support
and opposition to the proposal developed by the NTETC Measuring Sector
at its October 2003 Meeting. There was general support for the table
developed by WMD and modified by the NTETC Measuring Sector. There was
also general support for the definition of "not-built-for-purpose"
device. The SMA opposed the NTETC Measuring Sector's proposal because of
the difference in requirements for "built-for-purpose" devices and
"not-built-for-purpose" devices. The primary SMA opposition was that, in
the proposal, "built-for-purpose" devices are required to have the name
of the manufacturer, the model designation, and a nonrepetitive serial
number physically marked on the device. "Not-built-for-purpose" devices
are allowed to either physically mark or display those three pieces of
basic information. The SMA believes that the built-for-purpose devices
should have the same option of marking or displaying the make, model,
and serial number. One weights and measures official stated that the
revision number or software version number should be marked or displayed
on "built-for-purpose" devices as is required on "not-built-for-purpose"
devices. The official believes that changes can be made to the
programming of some "built-for-purpose" devices that is not readily
apparent to field officials. Marking or displaying a new version number
will assist the field official in determining whether or not the
metrological functions of the device are the same as the model submitted
for NTEP evaluation. The Committee agreed that the revision number or
software version numbers should be readily available to field officials
and modified Table G-S.1. to include the requirement that a
"built-for-purpose" device have the current revision number or software
version number displayed or permanently marked. The Committee also
recognized that currently Handbook 44, OIML R-76 Nonautomatic weighing
instruments, and OIML R-117 Measuring systems for liquids other than
water all require the name of the manufacturer, a model designation, and
serial number information to be marked on a "built-for-purpose" devices.
The Committee believes that, at this time, continuing the requirement
for marking basic identification information does not place an
additional burden on "built-for-purpose" device manufacturer's. The
2003 Weighing Sector Meeting, was held prior to the 2003 NTETC Measuring
Sector Meeting; therefore, the Weighing Sector did not review and
discuss the current proposal. The Weighing Sector was not scheduled to
meet again until the fall of 2004. The Weighing Sector's Technical
advisor advised the Committee of the plan to distribute the current
proposal along with a ballot requesting support from the membership
prior to the 2004 NCWM Annual Meeting. The Committee agreed that if the
Weighing Sector supported the proposal the item should be ready for a
vote of the Conference at that NCWM Annual Meeting.

At its April 2004 Meeting the SMA determined that based on the results
of the S&T Committee\'s request to poll the Weighing Sector Members,
there appears to be no clear consensus that the proposal is ready to be
a voting item. The SMA opposed this item and recommended that it be
removed from the voting calendar.

At its May 2004 meeting, NEWMA received comments from the SMA opposing
310-1 because there was no clear consensus among the Weighing Sector
members. Gilbarco requested the item be made informational. Gilbarco
believed that G-S.1.(e) requiring a software revision number would be
overly burdensome to both industry and NTEP since there are frequent
software changes and that the non-retroactive date of January 2004 in
proposed new Table G-S.1. has already passed. Belue Associates also
recommended making this item informational. NEWMA agreed to recommend
that item 310-1 be changed to an Information Item.

At the 2004 NCWM Annual Meeting, during the open hearing the SMA stated
that item 310-1 should not go forward for a vote because the ballot of
the Weighing Sector failed to provide clear support for the item. A
manufacturer stated that the term microprocessor is not appropriate
because their devices contain numerous microprocessors. Another
manufacturer stated that the requirement for marking the current
software version number would place an unrealistic burden on their
company. The Committee agreed that sufficient opposition and questions
were raised during the open hearing to demonstrate that the item is not
sufficiently developed to be a voting item at this meeting. The
Committee agreed to make item 310-1 an information item to be returned
to the NTETC Weighing and Measuring Sectors for further development.

For more background information, refer to the 2003 S&T Final Report.

####### 310-2 W G-N.3. Compatibility of Indicators and Weighing or Measuring Elements

(This item was withdrawn.)

**Source:** National Type Evaluation Technical Committee Measuring
Sector

**Recommendation:** Add a new paragraph G-N.3. Compatibility of
Indicators and Weighing or Measuring Elements to Handbook 44 to clarify
what requirements must be met to interface an indicating element and a
weighing or measuring element that have not been previously evaluated
together on a single NTEP Certificate of Conformance (CC), but which
have their own NTEP CC listing compatible communication specifications.

> [G-N.3. Compatibility of Indicators and Weighing or Measuring
> Elements. - To be considered compatible, all of the following
> conditions shall be met:]{.underline}
>
> [(a) The communication means to be used for the input to the
> electronic indicator (analog, digital, pulse, frequency, serial, etc.)
> has been previously evaluated with a weighing and measuring
> element;]{.underline}
>
> [(b) The communication means to be used for the output of the weighing
> or measuring element (analog, digital, pulse, frequency, serial, etc.)
> has been previously evaluated with an electronic
> indicator;]{.underline}
>
> [(c) The communication means to be used for the electronic indicator
> input is the same as the communication means to be used for the
> weighing and measuring element output (analog-analog, digital-digital,
> pulse-pulse, frequency-frequency, serial-serial, etc.);]{.underline}
>
> [(d) The devices are communicating with each other and the system into
> which they are installed can be accurately calibrated;
> and]{.underline}
>
> [(e) If required, Handbook 44 compliant tickets can be
> printed.]{.underline}

**Background/Discussion:** At the May 2001 NTEP Laboratory Meeting, one
of the participating laboratories asked for input regarding what testing
should be required if the manufacturer of an indicator wanted a CC to
recognize an indicator for use with different types of measuring
devices, such as positive displacement (pd) meters, turbine meters, and
mass flow meters. The California NTEP Laboratory agreed to provide a
draft of changes to the Liquid-Measuring Devices Checklist and
Procedures that included requirements for indicators intended for use
with more than one device type.

At its October 2003 Meeting, the NTETC Measuring Sector reviewed a
proposal submitted by the work group to add a new paragraph N.X. only to
Handbook 44 Section 3.30., 3.31., 3.32., and 3.37. The NTETC Measuring
Sector modified the proposal as shown above to be a General Code Test
Note to provide guidance to field officials for determining the
compatibility of indicators and weighing and measuring elements. The
Sector agreed to forward the modified proposal to the NCWM S&T Committee
through the SWMA.

At its October 2003 Meeting, the SWMA recommended that the proposal be
forward to the NCWM S&T Committee as an information item.

At its November 2003 Meeting, the Scale Manufacturers Association agreed
that the proposed new paragraph G‑N.3. was not sufficiently developed
for weighing applications and recommended that the proposal be referred
to the NTETC Weighing Sector for further development.

At the 2004 NCWM Interim Meeting, the S&T Committee heard several
comments indicating that this item is not sufficiently developed to move
forward. However, one manufacturer stated that his company manufactures
measuring and indicating elements or components that can be interfaced
to provide a complete measuring system. He believed this item needed to
be in Handbook 44 for the use of the field official and that the
proposal as written provided at least some guidance on compatibility of
components. The NIST WMD stated that there may be better alternatives,
such as the Examination Procedure Outlines, to placing these guidelines
in Handbook 44. The Committee agreed that the item is not sufficiently
developed to move forward. The Committee decided to withdraw Item
310-2 from the S&T Committee Agenda until it is further developed and
resubmitted with the support of the NTETC Weighing and Measuring
Sectors.

For more background information, refer to the 2003 S&T Final Report.

###### 320  SCALES

####### 320-1 V S.1.12. Manual Gross Weight Entries and UR.3.9. Use of Manual Gross Weight Entries

(This item was adopted.)

**Source:** Carryover Item 320-1. (This item originated from the Western
Weights and Measures Association (WWMA) and first appeared on the
Committee's 2002 agenda.)

**Recommendation:** Modify paragraphs S.1.12. and UR.3.9. as follows:

> ***S.1.12. Manual ~~Gross~~ Weight Entries. -** A device **[when being
> used for direct sale]{.underline}** shall accept an entry of a manual
> gross **[or net]{.underline}** weight value only when the scale **~~is
> at gross load zero and the scale~~ [gross or net\*
> weight]{.underline}** indication is **[at]{.underline}** zero **~~in
> the gross weights display mode~~.** Recorded manual weight entries,
> except those on labels generated for packages of standard weights,
> shall identify the weight value as a manual weight entry by one of the
> following terms: "Manual Weight," "Manual Wt," or "MAN WT." The use of
> a symbol to identify multiple manual weight entries on a single
> document is permitted, provided that the symbol is defined on the same
> page on which the manual weight entries appear and the definition of
> the symbol is automatically printed by the recording element as part
> of the document.*
>
> *\[Nonretroactive as of January 1, 1993\]*
>
> ***[\[\*Nonretroactive as of January 1, 2005\]]{.underline}***
>
> (Added 1992) **[(Amended 2004)]{.underline}**
>
> **UR.3.9. Use of Manual Gross [or Net]{.underline} Weight Entries. -**
> Manual gross or net weight entries are permitted ~~for use~~ in the
> following applications only:
>
> \(1\) When **[a point-of-sale system interfaced with a scale
> gives]{.underline}** credit **~~is given~~** for a weighed item **~~on
> point-of-sale systems interfaced with scales~~;**
>
> **(2) [When an item is pre-weighed on a legal for trade scale and
> marked with the correct net weight;]{.underline}**
>
> **[(3)]{.underline}** When a device or system **[is]{.underline}**
> generat~~**e**s~~**[ing]{.underline}** labels for standard weight
> packages;
>
> **(~~3~~[4]{.underline})** When postal scales or weight classifiers
> **[are]{.underline}** generat**~~e~~[ing]{.underline}** manifests for
> packages to be picked up at a later time; or
>
> **(~~4~~[5]{.underline})** When livestock and vehicle scale systems
> **[are]{.underline}** generat**~~e~~[ing]{.underline}** weight tickets
> to correct erroneous tickets.
>
> (Added 1992) (Amended 2000 **[and 2004]{.underline})**

**Discussion:** Since 2002, the Committee considered multiple proposals
to recognize applications where manual weight entries are conducted on
point-of-sale systems (POS). Specific instances include transactions
where items exceed the POS nominal capacity or the Universal Product
Code is illegible, but the weight and unit price information are
available on the item's label and can be entered in the POS to calculate
a price.

Handbook 44 includes provisions to deter fraudulent use of the manual
weight entry feature. Paragraph S.1.12. describes when a scale can
accept such an entry and how it must be identified. Paragraph UR.3.9.
specifies only four applications where the use of manual weight entries
are permitted. Handbook 44 also requires that a scale shall be suitable
for use, which includes its weighing capacity. The feature is not
intended as a substitute for a system with insufficient weighing
capacity.

The Committee acknowledged that manual weight entries are used in gross
and net weight transactions. The Committee considered several proposals
to address this practice. These proposals were either limited in the
applications they covered, unclear on what tare information must be
recorded, or appeared to prohibit manual tare entries. After lengthy
discussion at the 2003 NCWM Annual Meeting, the Committee agreed to keep
the following proposal an information item to allow sufficient time for
these deficiencies to be addressed:

> *S.1.12. Manual ~~Gross~~ Weight Entries. - A device shall accept an
> entry of a manual ~~gross~~ weight value only when the scale is at
> gross load zero and the scale [gross or net\* weight]{.underline}
> indication is [at]{.underline} zero ~~in the gross weights display
> mode~~. Recorded manual weight entries, except those on labels
> generated for packages of standard weights, shall identify the weight
> value as a manual weight entry by one of the following terms: "Manual
> Weight," "Manual Wt," or "MAN WT." The use of a symbol to identify
> multiple manual weight entries on a single document is permitted,
> provided that the symbol is defined on the same page on which the
> manual weight entries appear and the definition of the symbol is
> automatically printed by the recording element as part of the
> document.*
>
> *\[Nonretroactive as of January 1, 1993\]*
>
> *\[\*[Nonretroactive as of January 1, 2004]{.underline}.\]*
>
> UR.3.9. Use of Manual ~~Gross~~ Weight Entries. - Manual ~~gross~~
> weight entries are permitted for use in the following applications
> only: (1[) on a point-of-sale system interfaced with
> scales]{.underline} when credit is given for a weighed item ~~on
> point-of-sale systems interfaced with scales~~[, or when an item is
> pre-weighed and marked with the correct net weight]{.underline}; (2)
> when a device or system [is]{.underline} generat~~e~~[ing]{.underline}
> labels for standard weight packages; (3) when postal scales or weight
> classifiers [are]{.underline} generat~~e~~[ing]{.underline} manifests
> for packages to be picked up at a later time; ~~or~~ [and]{.underline}
> (4) ~~when~~ [on]{.underline} livestock [scale]{.underline} and
> vehicle scale systems generate weight tickets to correct erroneous
> tickets.

During its September 2003 Annual Technical Conference, the WWMA examined
the recommendation developed by the 2003 S&T Committee and an alternate
proposal that limited use of the manual weight entry feature to
point-of-sale (POS) systems. The WWMA agreed that limiting the use of
the feature to POS systems was too restrictive. The WWMA also agreed
that the S&T Committee's recommendation would make the current practice
of entering preset tare values with a load on the scale during direct
sale transactions very difficult. Consequently, the WWMA recommended an
alternate proposal for paragraph S.1.12. and modified paragraph U.3.9.
to limit manual weight entries to either gross or net weighed items as
follows:

> *S.1.12. Manual ~~Gross~~ Weight Entries. - A device shall accept an
> entry of a manual gross [or net]{.underline} weight value only when
> the scale is at gross load zero and the scale [gross or net\*
> weight]{.underline} indication is [at]{.underline} zero ~~in the gross
> weights display mode~~. Recorded manual weight entries, except those
> on labels generated for packages of standard weights, shall identify
> the weight value as a manual weight entry by one of the following
> terms: "Manual Weight," "Manual Wt," or "MAN WT." The use of a symbol
> to identify multiple manual weight entries on a single document is
> permitted, provided that the symbol is defined on the same page on
> which the manual weight entries appear and the definition of the
> symbol is automatically printed by the recording element as part of
> the document.*
>
> *\[Nonretroactive as of January 1, 1993\]*
>
> *[\[\*Nonretroactive as of January 1, 2005\]]{.underline}*
>
> (Added 1992) [(Amended 2004)]{.underline}
>
> UR.3.9. Use of Manual ~~Gross~~ Weight Entries. - Manual gross [or
> net]{.underline} weight entries are permitted for use in the following
> applications only: (1[) on a point-of-sale system interfaced with
> scales]{.underline} when credit is given for a weighed item ~~on
> point-of-sale systems interfaced with scales~~[, or when an item is
> pre-weighed and marked with the correct net weight]{.underline}; (2)
> when a device or system [is]{.underline} generat~~e~~[ing]{.underline}
> labels for standard weight packages; (3) when postal scales or weight
> classifiers [are]{.underline} generat~~e~~[ing]{.underline} manifests
> for packages to be picked up at a later time; and (4) on livestock
> scale and vehicle scale systems [that]{.underline} generate weight
> tickets to correct erroneous tickets.

One scale manufacturer noted that prepackaged standard weight
commodities require nutritional labeling; therefore, paragraph S.1.12.
should specify use of the feature only in direct sales applications. The
Committee considered a recommendation to modify paragraph S.1.12. to
permit a device to accept a manual weight entry when the scale is at
gross or net load zero. The Committee concluded that this practice would
mislead the customer in direct sales applications to believe that the
indicated or printed weight information on the receipt represents the
object on the scale.

The Northeastern Weights and Measures Association recommended modifying
the proposal to require manual weight entries only when a device is used
for direct sale, removing the term "gross" from paragraph UR.3.9. and
making the proposal an information item.

The Scale Manufacturers Association (SMA) recommended an alternate
proposal to modify paragraphs S.1.12. and UR.3.9. shown in the
recommendation above. The Committee agreed with SMA's recommendation to
modify paragraph S.1.12. as shown in the recommendation above to include
the text "when being used for direct sale." The text was added to
paragraph S.1.12. to eliminate any conflict that might arise when using
the manual weight entry feature to label standard weight packages on
scales approved for direct sale applications. The Committee modified the
proposal to permit use of scales to prepack items without requiring the
scale to return to zero between each weighment. Other modifications were
made to the proposal to ensure that the text was grammatically correct.

The Committee acknowledged the importance of using a "legal for trade"
scale to obtain weight values for preweighed items and modified the SMA
proposal accordingly.

For more background information, refer to the 2002 and 2003 S&T Final
Reports.

####### 320-2 W S.6.4. Railway Track Scales 

(This item was withdrawn.)

**Source:** Carryover Item 320-3. (This item originated from the Central
Weights and Measures Association (CWMA) and first appeared on the
Committee's 2003 agenda.)

**Discussion:** The Committee considered a proposal to modify paragraph
S.6.4. in the Scales Code as follows:

> S.6.4. Railway Track Scales. - A railway track scale shall be marked
> with the maximum capacity of each section of the load-receiving
> element of the scale. Such marking shall be accurately and
> conspicuously presented on, or adjacent to, the identification or
> nomenclature plate that is attached to the indicating element of the
> scale. *~~The nominal capacity of a scale with more than two sections
> shall not exceed twice its rated section capacity. The nominal
> capacity of a two-section scale shall not exceed its rated section
> capacity^\*^.~~ [The marked nominal capacity shall not exceed the
> sectional capacity (SC) multiplied by the number of sections (N) of
> the scale minus 0.5 sections. The formula is stated as
> Nominal Capacity  SC x (N - 0.5)\*.]{.underline}*
>
> *\[\*Nonretroactive as of January 1, 200~~2~~[4]{.underline}\]*

This proposal was intended to increase the allowable nominal capacity of
railway track scales by modifying the formula in paragraph S.6.4. Most
manufacturers acknowledge that modular systems designed to railroad
engineering specifications are able to withstand loads greater than
those permitted in paragraph S.6.4. However, one manufacturer found that
the length of modular systems is limited by the ratio of the nominal
capacity to the section capacity allowed in paragraph S.6.4.

Any requirement that addresses scale capacity must not conflict with the
requirement that prohibits scales from operating outside of the
allowable limits of their marked capacity. Movement of locomotives
across railway track scale systems results in loads that exceed the
marked scale capacity. Properly designed systems can withstand the
overload and indicate an accurate weight once the total load is no
longer in excess of 105 % of the marked scale capacity.

The Committee reviewed examples of railway track scale loading where the
movement of rail cars across modular systems resulted in loads that
exceeded the nominal capacity limit specified in paragraph S.6.4. During
each weighment, cars are uncoupled to prevent coupler interaction or
weight transfer. The design load capacity (per railroad requirements)
was not exceeded.

In July 2003, the Committee acknowledged that the proposed change to the
formula permits nominal capacities that may exceed the system's safe
load. Additionally, weights and measures jurisdictions may not have
sufficient weights to test systems that exceed 640 000 lb capacity.
Consequently, the Committee recommended further review of the proposal
by manufacturers and the NTETC Weighing Sector.

The CWMA recommended the proposal move forward as written pending
additional input from the Weighing Sector and the Association of
American Railroads (AAR). The CWMA also noted that if any abbreviations
for section capacity were adopted as outlined in S&T Item 320-3 then
those abbreviations should be used in the formula.

The Western Weights and Measures Association heard testimony from the
AAR indicating they did not support the proposal because the proposed
formula allows systems with capacities that would exceed a scale's
structural capacity. The AAR was satisfied with the current language in
paragraph S.6.4., but was willing to work with the submitter of the
proposal to address the submitter's concerns. Based upon the testimony
from the AAR, the WWMA recommended the proposal be withdrawn.

The Southern Weights and Measures Association recommended the NCWM S&T
Committee withdraw this proposal, but did not provide its rationale for
reaching this position.

The AAR also noted that the proposal sets no limits on nominal capacity,
thus permitting systems with capacities far above the typical weight
loads. The AAR indicated that it has not received any requests for
changes to capacities or input on problems with existing capacity limits
from railway track scale users or manufacturers. The AAR found that the
heaviest gross load for existing four axle cars is 315 000 lb, yet a
two-section railway track scale equipped with 100 000 lb load cells can
accommodate a load of 340 000 lb.

One representative from the railroad industry noted that there are
limits to the amount of test weight that can be concentrated on a
70-foot railway track scale. For example, only 100 000 lb can be
concentrated in a 7-foot span. Furthermore meeting both the current
Handbook 44 minimum requirement for a test to 12.5 % scale capacity with
test weights and then 25 % of scale capacity is difficult, if the
proposal allows scales that exceed 500 000 lb capacity.

The Committee later considered an alternate proposal developed by
Systems Associates, Inc., the submitter of the original proposal as
follows:

> Modify paragraph S.6.4. as follows:
>
> S.6.4. Railway Track Scales.
>
> [(a)]{.underline} A railway track scale shall be marked with the
> maximum capacity of each section of the load-receiving element of the
> scale. Such marking shall be accurately and conspicuously presented
> on, or adjacent to the identification or nomenclature plate that is
> attached to the indicating element of the scale.
>
> [(b)]{.underline} *The nominal capacity of a [railway
> track]{.underline} scale ~~with more than two sections~~ shall not
> exceed* *~~twice its rated section capacity~~* [the lesser of;
> 640 000 lb or 80 000 lb for each 5 feet of weigh rail length or
> portion thereof and; the section capacity (SC) multiplied by the
> number of sections (N) of the scale minus 0.5. The formula is stated
> as Nominal Capacity = SC x (N - 0.5).]{.underline} *~~The nominal
> capacity of a two-section scale shall not exceed its rated section
> capacity.~~*
>
> *\[\*Nonretroactive as of January 1, 2002\]*
>
> Add new paragraph UR.X. as follows:
>
> [UR.X. Railcars weighed statically shall be uncoupled and alone on the
> load-receiving element as the weight is recorded.]{.underline}

The Committee has not heard sufficient technical grounds for modifying
the formula to permit unlimited nominal capacities for railway track
scales. The proposal appears to have little support from parties that
would be most affected by the changes to paragraph S.6.4., if the
proposal were adopted. Additionally, there remains some concern about
the difficulty of locating sufficient test weights and the ability to
concentrate a test load on scales with capacities that exceed
640 000 lb. Consequently, the Committee withdrew the proposal from the
agenda and asked the AAR and Systems Associates, Inc. to find an
alternate proposal that is amenable to both parties and the industries
they represent.

**Editorial Note:** The Northeastern Weights and Measures Association
(NEWMA) proposal to modify Table 4, Minimum Test Weights and Test Loads
begins to address the maximum test load on all large capacity scales.
erroneously appeared in Interim Agenda Item 320-2. The Committee agreed
that it has merit, but is insufficiently developed for Committee action.
Consequently, NEWMA's proposal now appears in Appendix A as developing
item Part 2, Scales Code in the 2004 Committee's Final Report.

####### 320-3 VC Table S.6.3.a. Marking Requirements and Table S.6.3.b. Notes for Table S.6.3.a; Note 24 Section Capacity Prefix 

(This item was adopted.)

**Source:** Central Weights and Measures Association (CWMA)

**Recommendation:** Modify Table S.6.3.a. Marking Requirements as
follows:

+----------------+-----------+------------+------------+-----+-------+
| **Table        |           |            |            |     |       |
| S.6.3.a.**     |           |            |            |     |       |
|                |           |            |            |     |       |
| # Markin       |           |            |            |     |       |
| g Requirements |           |            |            |     |       |
+----------------+-----------+------------+------------+-----+-------+
| **To Be Marked | *         |            |            |     |       |
| With ⇓**       | *Weighing |            |            |     |       |
|                | Eq        |            |            |     |       |
|                | uipment** |            |            |     |       |
+----------------+-----------+------------+------------+-----+-------+
|                | **        | **         | **Weighing | **L | **    |
|                | Weighing, | Indicating | and        | oad | Other |
|                | load-r    | element    | load       | c   | equi  |
|                | eceiving, | not        | -receiving | ell | pment |
|                | and       | p          | element    | w   | or    |
|                | i         | ermanently | not        | ith | d     |
|                | ndicating | attached   | p          | CC  | evice |
|                | element   | to         | ermanently | (11 | (     |
|                | in same   | weighing   | attached   | )** | 10)** |
|                | housing   | and        | to         |     |       |
|                | or        | load       | indicating |     |       |
|                | covered   | -receiving | element or |     |       |
|                | on the    | element or | covered by |     |       |
|                | same      | covered by | a separate |     |       |
|                | CC^1^**   | a separate | CC**       |     |       |
|                |           | CC**       |            |     |       |
+----------------+-----------+------------+------------+-----+-------+
| Manufacturer's | **X**     | **X**      | **X**      | **  | **X** |
| ID (1)         |           |            |            | X** |       |
+----------------+-----------+------------+------------+-----+-------+
| **.**          | **.**     | **.**      | **.**      | **  | **.** |
|                |           |            |            | .** |       |
| **.**          | **.**     | **.**      | **.**      |     | **.** |
|                |           |            |            | **  |       |
| **.**          | **.**     | **.**      | **.**      | .** | **.** |
+----------------+-----------+------------+------------+-----+-------+
| Section        |           | **X**      | **X**      |     |       |
| Capacity       |           |            |            |     |       |
| **[and         |           |            |            |     |       |
| Prefix]        |           |            |            |     |       |
| {.underline}** |           |            |            |     |       |
| (14)(2         |           |            |            |     |       |
| 0)(22)**[(24)] |           |            |            |     |       |
| {.underline}** |           |            |            |     |       |
+----------------+-----------+------------+------------+-----+-------+
| **Note:** For  |           |            |            |     |       |
| applicable     |           |            |            |     |       |
| notes, see     |           |            |            |     |       |
| Table S.6.3.b. |           |            |            |     |       |
|                |           |            |            |     |       |
| ^1^Weighing/   |           |            |            |     |       |
| load-receiving |           |            |            |     |       |
| elements and   |           |            |            |     |       |
| indicators     |           |            |            |     |       |
| which are in   |           |            |            |     |       |
| the same       |           |            |            |     |       |
| housing or     |           |            |            |     |       |
| which are      |           |            |            |     |       |
| permanently    |           |            |            |     |       |
| attached will  |           |            |            |     |       |
| generally      |           |            |            |     |       |
| appear on the  |           |            |            |     |       |
| same CC. If    |           |            |            |     |       |
| not in the     |           |            |            |     |       |
| same housing,  |           |            |            |     |       |
| elements shall |           |            |            |     |       |
| be hard wired  |           |            |            |     |       |
| together or    |           |            |            |     |       |
| sealed with a  |           |            |            |     |       |
| physical seal  |           |            |            |     |       |
| or an          |           |            |            |     |       |
| electronic     |           |            |            |     |       |
| link. This     |           |            |            |     |       |
| requirement    |           |            |            |     |       |
| does not apply |           |            |            |     |       |
| to peripheral  |           |            |            |     |       |
| equipment that |           |            |            |     |       |
| has no input   |           |            |            |     |       |
| or effect on   |           |            |            |     |       |
| device         |           |            |            |     |       |
| calibrations   |           |            |            |     |       |
| or             |           |            |            |     |       |
| c              |           |            |            |     |       |
| onfigurations. |           |            |            |     |       |
+----------------+-----------+------------+------------+-----+-------+
| (Added 1990)   |           |            |            |     |       |
| (Amended 1992, |           |            |            |     |       |
| 1999, 2000,    |           |            |            |     |       |
| 20             |           |            |            |     |       |
| 01 **~~and~~** |           |            |            |     |       |
| 2002**[, and   |           |            |            |     |       |
| 2004]{         |           |            |            |     |       |
| .underline})** |           |            |            |     |       |
| (Footnote      |           |            |            |     |       |
| 1 Added 2001)  |           |            |            |     |       |
+----------------+-----------+------------+------------+-----+-------+

Add new Note 24. to Table S.6.3.b. Notes for Table S.6.3.a. as follows:

> **[24. The section capacity shall be prefaced by the words "Section
> Capacity" or an abbreviation of that term. Abbreviations shall be "Sec
> Cap" or "Sec C" All capital letters and periods may be
> used.]{.underline}**
>
> **[(Added 2004)]{.underline}**

**Discussion:** The CWMA believes that current NIST Handbook 44 may be
interpreted to prohibit the abbreviation of section capacity.
Manufacturers abbreviate marking information because some device
identification badges are limited in space. The CWMA recommended adding
a new paragraph S.6.4.3. that requires identification of section
capacity information with a prefix and defines acceptable abbreviations
for that prefix. The CWMA did not submit specific language for
addressing the abbreviation of section capacity in Table S.6.3.a.
Marking Requirements and Table S.6.3.b. Notes For Table S.6.3.a.

The Western Weights and Measures Association (WWMA) heard that the NTETC
Weighing Sector and manufacturers supported the intent of the proposal.
However, the WWMA believed the CWMA proposal should be simplified and
modified for clarity. The WWMA agreed that use of the abbreviations "SC"
and "S Cap" to identify section capacity are not acceptable because they
might be interpreted to represent scale capacity. The WWMA considered a
recommendation to include identification requirements for section
capacity in General Code paragraph G-S.1. Identification since that
requirement specifies other marking information and prefixes.
Ultimately, the WWMA decided to address the abbreviation of "section
capacity" as a Scales Code requirement. The WWMA worked with the NTETC
Weighing Sector Technical Advisor to develop the alternate proposal to
modify Table S.6.3.a. and Table S.6.3.b., which is shown in the
recommendation above.

The Scale Manufacturers Association supported the proposal for including
in Table S.6.3.a. and Table S.6.3.b. language that requires a prefix to
identify the scale's section capacity and specifies how the prefix must
be abbreviated.

The Committee agreed that the best approach for designating a prefix
that identifies the scale's section capacity is the WWMA alternate
proposal which is outlined in the recommendation above. This proposal is
consistent with the current practice of listing other scale marking
requirements in one table. The Committee modified the proposed new Note
24. by removing the word "Acceptable." The Committee did not believe it
was necessary to include this term since acceptable abbreviations are
adequately defined in the note's text.

####### 320-4 VC N.3.2. Field Standard Weight Carts

(This item was adopted.)

**Source:** Carryover Item 320-11. (This item originated from the
Northeastern Weights and Measures Association (NEWMA) and first appeared
on the Committee's 2003 agenda.)

**Recommendation:** Add new paragraph N.3.2.

> **[N.3.2. Field Standard Weight Carts. - Field Standard Weight Carts
> that comply with the tolerances expressed in Fundamental
> Considerations, paragraph 3.2. (i.e., one-third of the smallest
> tolerance applied) may be included as part of the minimum required
> test load for shift tests and other test procedures.]{.underline}**
>
> **[(Added 2004)]{.underline}**

**Discussion:** Originally, NEWMA submitted a proposal which was
intended to modify the NIST Handbook 44 Scales Code to recognize the use
of weight carts during a shift test. During its October 2003 Interim
Meeting, NEWMA indicated that its original proposal was not ready for
adoption by the NCWM. New York noted that NEWMA's proposal shown below
should include a reference to the Handbook 44 Fundamental Considerations
3.2 Tolerances for Standards. New York also recommended modifying
NEWMA's proposal to eliminate any requirements that specify a particular
type of information that must be included in the weight cart's
calibration report as follows:

> N.1.3.4.1. Weight Carts. - Weight carts may be included as part of the
> minimum required test load required in N.1.3.4. provided that the mass
> value of the weight cart has been determined by weights and measures
> and is clearly marked thereon. Further, a certificate of calibration
> issued by the weights and measures jurisdiction that issued the weight
> certificate must be available at all times. ~~Said certificate shall
> contain at a minimum the following information: the date of
> calibration, name, model, and serial number of the weight cart; the
> minimum graduation of the scale used in the calibration of the weight
> cart; and the name of the jurisdiction and inspector or metrologist
> who determined the mass value~~.

At the 2004 NCWM Interim Meeting, the Committee heard that the NEWMA
proposal was unclear as to how the mass value is determined by a weights
and measures jurisdiction. The Committee agreed that the portions of the
proposed language intended to address the reference standard should
include information about the uncertainty of the scale used as the
reference standard rather than the scale's minimum graduation size. The
uncertainty of the reference scale is essential in the calibration
report for the weight cart to establish the accuracy of measurements
made with the field standard.

The Central Weights and Measures Association (CWMA) developed an
alternate proposal that specified weight carts may be used as part of
the minimum load for shift tests on vehicle scales. The CWMA believed
that an additional proposal was needed to permit the use of weight carts
in tests other than shift tests. The CWMA also recommended that the
proposal make reference to weight carts meeting the Fundamental
Considerations Tolerance for Standards when a weight cart is used as the
testing apparatus in accordance with the requirements for calibration of
a field test standard in NIST Handbook 105-8, Specification and
Tolerances for Field Standard Weight Carts.

The Committee agreed that the test note should include language that
permits use of weight carts for shift tests and other tests as well as
specify a standard for the weight cart. The Fundamental Considerations
prescribe the allowable error in a field test standard used by weights
and measures officials. The Committee also noted that the proposed
paragraph designation of "N.1.3.4.1." is already in use. Consequently,
the Committee modified the CWMA proposal as shown in the recommendation
above to include a new paragraph designation and to require that field
standard weight carts comply with the guidelines for test apparatus in
the Fundamental Considerations.

The Committee acknowledged that it is general knowledge that NIST
Handbook 105-8 is available through the NIST Weights and Measures
Division web site at www.nist.gov/owm and Handbook 105-8 was published
in December 2003.

####### 320-5 VC N.1.5. Discrimination Test 

(This item was adopted.)

**Source:** Central Weights and Measures Association (CWMA)

**Recommendation:** Modify paragraph N.1.5. as follows:

> ***N.1.5. Discrimination Test. -** A discrimination test shall be
> conducted on all automatic indicating scales with the weighing device
> in equilibrium at **[or near]{.underline}** zero load and at **[or
> near]{.underline}** maximum test load, and under controlled conditions
> in which environmental factors are reduced to the extent that they
> will not affect the results obtained. **[For scales equipped with the
> Automatic Zero-Setting Mechanism (AZSM), the discrimination test may
> be conducted at a range outside of the AZSM range.]{.underline}***
>
> *\[Nonretroactive as of January 1, 1986\]*
>
> (Added 1985) **[(Amended 2004)]{.underline}**

**Discussion:** The CWMA agreed that it is impossible to conduct a
discrimination test and verify the zone of uncertainty *at* zero if the
Automatic Zero-Setting Mechanism (AZSM) is operational. The CWMA
believed the test should be conducted *near* zero without the weights
and measures official having to disable AZSM. The CWMA did not want
officials having to access the inside of scales to disable and then make
operational AZSM or any other feature.

The Scale Manufacturers Association supported this item.

The Committee recognized that there are environmental and scale design
factors that can affect the results of a discrimination test. The
Committee also acknowledged that it is acceptable to perform a
discrimination test at zero load just above the zero tracking range for
scales that are equipped with AZSM. The test is also acceptable when
performed just below the scale's maximum capacity, in the event that a
scale is set up to display an indication of over capacity when that
maximum total load is in excess of the capacity established in paragraph
S.1.7. Capacity Indication, Weight Ranges, and Unit Weights.

The Committee believes it is important for weights and measures
officials to understand how to conduct the discrimination test on scales
equipped with or not equipped with AZSM. The Committee agreed that the
test shall be conducted either "at or near" the zero load and "at or
near" the maximum test load and modified the proposal accordingly. The
modified language also allows officials to use their discretion in
conducting the discrimination test on scales equipped with AZSM. In this
case, the official may elect to disable the feature or conduct the
discrimination test near the zero load and near the maximum test load
when an operational AZSM makes the test difficult.

####### 320-6 VC Table 3 Parameters for Accuracy Classes; Footnote 5 Grain Hopper Scales

(This item was adopted.)

**Source:** Central Weights and Measures Association (CWMA)

**Recommendation:** Add a new footnote to Table 3 as follows:

+-------------+-------------------------+-------------+--------------+
| #######     |                         |             |              |
| # *Table 3* |                         |             |              |
|             |                         |             |              |
| **          |                         |             |              |
| *Parameters |                         |             |              |
| for         |                         |             |              |
| Accuracy    |                         |             |              |
| Classes***  |                         |             |              |
+-------------+-------------------------+-------------+--------------+
| ***Class*** | ***Val­ue of the         | ***Nu­m­be­r   |              |
|             | veri­fi­ca­tion scale      |  of­ scale^4 |              |
|             | divi­sion***             |  ^divi­sions |              |
|             |                         | (n)***      |              |
|             | ***(d or e^1^)***       |             |              |
+-------------+-------------------------+-------------+--------------+
|             |                         | **          | *            |
|             |                         | *Mini­mum*** | **Maximum*** |
+-------------+-------------------------+-------------+--------------+
| ***SI       |                         |             |              |
| Units***    |                         |             |              |
+-------------+-------------------------+-------------+--------------+
| *.*         | *.*                     | *.*         | *.*          |
|             |                         |             |              |
| *.*         | *.*                     | *.*         | *.*          |
|             |                         |             |              |
| *.*         | *.*                     | *.*         | *.*          |
+-------------+-------------------------+-------------+--------------+
| *III^2**    | *0.1 to 2 g, inclusive* | *100*       | *10 000*     |
| ,\ [5]{.und |                         |             |              |
| erline}**^* |                         |             |              |
+-------------+-------------------------+-------------+--------------+
| *.*         | *.*                     | .           | .            |
|             |                         |             |              |
| *.*         | *.*                     | .           | .            |
|             |                         |             |              |
| *.*         | *.*                     | .           | .            |
+-------------+-------------------------+-------------+--------------+
| ######      |                         |             |              |
| ### *INCH‑P |                         |             |              |
| OUND Units* |                         |             |              |
+-------------+-------------------------+-------------+--------------+
| *III^2**    | *0.0002 lb to 0.005 lb, | *100*       | *10 000*     |
| ,\ [5]{.und | inclusive*              |             |              |
| erline}**^* |                         | .           | .            |
|             | *.*                     |             |              |
| .           |                         | .           | .            |
|             | *.*                     |             |              |
| .           |                         | .           | .            |
|             | *.*                     |             |              |
| .           |                         |             |              |
+-------------+-------------------------+-------------+--------------+
| *^1^For     |                         |             |              |
| Class I and |                         |             |              |
| II devices  |                         |             |              |
| equipped    |                         |             |              |
| with        |                         |             |              |
| auxiliary   |                         |             |              |
| reading     |                         |             |              |
| means       |                         |             |              |
| (i.e., a    |                         |             |              |
| rider, a    |                         |             |              |
| vernier, or |                         |             |              |
| a least     |                         |             |              |
| significant |                         |             |              |
| decimal     |                         |             |              |
| dif         |                         |             |              |
| ferentiated |                         |             |              |
| by size,    |                         |             |              |
| shape, or   |                         |             |              |
| color), the |                         |             |              |
| value of    |                         |             |              |
| the         |                         |             |              |
| v           |                         |             |              |
| erification |                         |             |              |
| scale       |                         |             |              |
| division"e" |                         |             |              |
| is the      |                         |             |              |
| value of    |                         |             |              |
| the scale   |                         |             |              |
| division    |                         |             |              |
| immediately |                         |             |              |
| preceding   |                         |             |              |
| the         |                         |             |              |
| auxiliary   |                         |             |              |
| means.*     |                         |             |              |
|             |                         |             |              |
| *.*         |                         |             |              |
|             |                         |             |              |
| *.*         |                         |             |              |
|             |                         |             |              |
| *.*         |                         |             |              |
|             |                         |             |              |
| **[^5^The   |                         |             |              |
| minimum     |                         |             |              |
| number of   |                         |             |              |
| scale       |                         |             |              |
| divisions   |                         |             |              |
| for a Class |                         |             |              |
| III Hopper  |                         |             |              |
| Scale used  |                         |             |              |
| for         |                         |             |              |
| weighing    |                         |             |              |
| grain shall |                         |             |              |
| be          |                         |             |              |
| 2000.]{.u   |                         |             |              |
| nderline}** |                         |             |              |
+-------------+-------------------------+-------------+--------------+
| *\[Non      |                         |             |              |
| retroactive |                         |             |              |
| as of       |                         |             |              |
| January 1,  |                         |             |              |
| 1986\]*     |                         |             |              |
|             |                         |             |              |
| (Amended    |                         |             |              |
| 1986, 1987, |                         |             |              |
| 1997, 1998, |                         |             |              |
| 1999,       |                         |             |              |
| **~~and~~** |                         |             |              |
| 2003,       |                         |             |              |
| **[and      |                         |             |              |
| 2004]{.un   |                         |             |              |
| derline})** |                         |             |              |
| (Footnote   |                         |             |              |
| 4 Added     |                         |             |              |
| 1997)       |                         |             |              |
| *           |                         |             |              |
| *[(Footnote |                         |             |              |
| 5 Added     |                         |             |              |
| 2004)]{.u   |                         |             |              |
| nderline}** |                         |             |              |
+-------------+-------------------------+-------------+--------------+

**Discussion:** Requirements for the minimum and maximum number of scale
divisions are listed in Table 3 Parameters for Accuracy Classes;
however, the table presently does not recognize a limitation to the
minimum and maximum number of scale divisions included in user
requirement, paragraph UR.1.2. Grain Hopper Scales. To ensure both
manufacturer and users are aware of this limitation, the CWMA
recommended adding a new footnote 5 to Table 3 making the information
about grain hopper scales available in paragraphs intended for device
manufacturers. The CWMA believes that paragraph UR.1.2. requirements for
the minimum number of scale divisions for a Class III Hopper Scale used
for grain weighing is overlooked.

The Scale Manufacturers Association (SMA) opposed this proposal because
it introduces a new application into Table 3. SMA prefers that Table
3 not include any application requirements.

The Committee believes that adding a new note to Table 3 helps to
clarify for the manufacturer and official the allowable minimum number
of scale divisions for a Class III Hopper Scale used in grain weighing
applications. Adding the text from the user requirement into Table 3 is
consistent with current Table 3 requirements for hopper scales and
further explains the parameters that apply for this device type.

The Committee acknowledged that there are instances where a long laundry
list of exceptions can make a requirement unwieldy; however, the
proposal does not fall into that category. The Committee remains
convinced that Table 3 is the appropriate location for the proposed
footnote and the proposal as written provides needed information to
parties that must design and inspect devices for compliance with
accuracy class requirements.

####### 320-7 W Appendix D; Definition of Counter Scale, S.2.1.3. Scales Equipped with an Automatic Zero-Setting Mechanism, N.1.3.1. Bench or Counter Scales, and N.1.3.8. All Other Scales Except Crane Scales, Hanging Scales, Hopper Scales, Wheel-Load Weighers, and Portable Axle-Load Weighers

(This item was withdrawn.)

**Source:** Carryover Item 320-4. (This item originated from the
National Type Evaluation Technical Committee (NTETC) Weighing Sector and
first appeared on the Committee's 2003 agenda.)

**Discussion:** The Committee was asked to consider several proposals to
clarify the definition, shift test, and other requirements for "counter
scale" as follows:

> Counter Scale. ~~One~~ [A scale]{.underline} that, by reason of its
> size, arrangement of parts, and ~~moderate~~ [with a]{.underline}
> nominal capacity [no greater than 100 kg (220 lb)]{.underline}, is
> adapted for use on a counter or bench. Sometimes called "bench scale."
> \[2.20\]

The Western Weights and Measures Association (WWMA) recommended an
alternate proposal to amend paragraph S.2.1.3. as follows:

> *S.2.1.3. Scales Equipped with an Automatic Zero-Set­ting Mech­anism. -
> Under normal operating conditions the maximum load that can be
> \"rezeroed,\" when either placed on or removed from the platform all
> at once, shall be:*
>
> *(a) For bench~~,~~ [and]{.underline} counter~~, and livestock~~
> [scales installed prior to January 1, 200X]{.underline}: 0.6 scale
> division;*
>
> *[(b) For livestock scales: 0.6 scale division]{.underline}*
>
> *(~~b~~[c]{.underline}) For vehicle, axle-load, and railway track
> scales: 3.0 scale divi­sions; ~~and~~*
>
> *(~~c~~[d]{.underline}) For all other scales [installed prior to
> January 1, 200X]{.underline}: 1.0 scale division~~.~~[;
> and]{.underline}*
>
> *[(e) For all scales other than livestock, vehicle, axle-load, and
> railway track scales: 0.5 scale division.]{.underline}*
>
> *\[Nonretroactive ~~and enforceable~~ as of
> January 1, ~~1981~~[200X]{.underline}\]*

Delete paragraph N.1.3.1. as follows:

> ~~N.1.3.1. Bench or Counter Scales. A shift test shall be conducted
> with a half-capacity test load centered successively at four points
> equidistant between the center and the front, left, back, and right
> edges of the load-receiving element.~~

Renumber paragraphs N.1.3.2. Dairy-Product-Test Scale through N.1.3.7.
Vehicle On-board Weighing Systems.

Amend paragraph N.1.3.8. as follows:

> N.1.3.[7]{.underline}~~8~~. All Other Scales Except Crane Scales,
> Hanging Scales, Hopper Scales, Wheel-Load Weighers, and Portable
> Axle-Load Weighers. - [When testing a scale with a load receiving
> element having no more than four load supports, a]{.underline} ~~A~~
> shift test shall be conducted with a [one-third]{.underline}
> ~~half-~~capacity test load centered, as nearly as possible,
> successively at the center of each quarter of the load-receiving
> element [as shown in the figures below]{.underline}.~~, or~~ [For
> scales with a capacity greater than 151 kg (301 lb) and having more
> than one load support, a shift test may be conducted]{.underline} with
> a quarter capacity test load centered, as nearly as possible,
> successively over each main load support.

![](media/image1.png){width="6.34375in" height="2.2069444444444444in"}

In 2003, the Committee examined a 2002 NTETC Weighing Sector proposal to
modify paragraphs N.1.3.1. and N.1.3.8. that prescribed test procedures
based on the number of platform supports. The proposal also revised the
definition of "counter scale" to include a nominal capacity limit that
distinguishes bench/counter scales from floor scales. A capacity limit
of 100 kg for bench/counter scales was recommended for consistency with
Measurement Canada requirements.

The Weighing Sector also noted that NIST Handbook 44 paragraph S.2.1.3.
Scales Equipped with an Automatic Zero-Setting Mechanism specifies a
different maximum load that can be rezeroed for bench/counter scales
(0.6 scale division) from that prescribed for all other scales
(1.0 scale division).

Industry and weights and measures officials opposed the proposed changes
to paragraphs N.1.3.1. and N.1.3.8. because they were too confusing, but
they did support modifications to the definition of "counter scale" as
shown above.

During its discussions at the 2003 NCWM Annual Meeting, the Committee
acknowledged there are benefits to harmonizing requirements. However,
the Committee concluded that modifying the definition of counter scale
alone did not clarify which shift test procedure is appropriate for a
given scale design and did not provide field officials with sufficient
information to conduct an appropriate shift test. The Committee
recommended that the Weighing Sector consider developing a policy where
scale design information must be included on all NTEP Certificates of
Conformance to assist officials in the determination of the appropriate
shift test for a particular scale design.

The Central Weights and Measures Association (CWMA) believes that the
current Handbook 44 definition of "counter scale" was adequate for the
official to determine whether or not a scale is classified as a counter
scale and to conduct the appropriate shift test. Therefore, the CWMA
recommended the proposal to modify the definition of "counter scale" be
withdrawn.

The Western Weights and Measure Association (WWMA) heard opposition to
the proposed definition as written. The WWMA also reviewed several
alternate proposals from NIST. Scale manufacturers commented that
language in OIML R 76 Non-Automatic Weighing Instruments is less
ambiguous and requires a one-third capacity shift test load centered in
the quadrants of a scale. In addition, the test procedure results in a
load that has the equivalent effect of a shift test load at one‑half
capacity that is currently prescribed in paragraph N.1.3.1. Industry
indicated that this approach is appropriate since a majority of scales
they manufacture meet both U.S. and international performance
requirements. Consequently, the WWMA recommended an alternate proposal
shown above to address the Weighing Sector's concerns about how to align
Handbook 44 with OIML R 76  paragraphs 4.5.7. (Zero-tracking device) and
A.4.7. (Eccentricity tests).

The Northeastern Weights and Measures Association (NEWMA) opposed the
proposed definition as written, but did not provide an explanation for
its opposition. NEWMA also indicated it would need additional time to
review the WWMA alternate proposal.

The Southern Weights and Measures Association reviewed the WWMA
alternate proposal and recommended that the NCWM S&T Committee keep this
proposal an information item until the Weighing Sector has the
opportunity to provide input.

The Scale Manufacturers Association (SMA) opposed the proposed
definition and recommended that it be withdrawn and returned to the
Weighing Sector where it should be considered for harmonization with
OIML requirements. The SMA also believed that if modifications are made
to paragraph S.2.1.3. then the requirement should specify that the
0.5 division is the maximum load that can be rezeroed for new scales
equipped with an AZSM.

NIST WMD noted that the WWMA alternate proposal, as written, appears to
include a nonretroactive enforcement date which may eliminate AZSM
requirements entirely for existing scales.

The Committee agreed that the proposal needed additional work. The
proposals before the Committee have attempted to address three different
issues: (1) refining the definition of a device type, (2) reducing the
limits for automatic zero setting mechanisms on Class III scales, and
(3) prescribing the appropriate shift test procedures for a device type,
that seem to have the counter/bench scale as a common thread. The WWMA
proposal should be reviewed against current paragraph N.1.3.8. in the
2004 Edition of NIST Handbook 44 to determine what is the most
appropriate test load and test pattern. One resounding theme in many
comments about the WWMA proposal is that the Weighing Sector should be
in agreement that the language harmonizes with OIML requirements. The
OIML requirements appear to be based on load support design rather than
a specific device nomenclature. Consequently, the Committee is
withdrawing this item until the Weighing Sector can develop the issue
further and resolve the concerns expressed by industry and weights and
measures officials.

####### 320-8 I S.1.1. (c) Zero Indication; Requirements for Markings or Indications for Other than Digital Zero Indications

**Source:** NCWM S&T Committee

**Discussion:** In response to a request for an interpretation of
paragraph S.1.1.(c), the Committee included on its agenda a proposal to
amend the paragraph to clarify the original intent of the requirement as
follows:

> S.1.1. Zero Indication.
>
> \(a\) On a scale equipped with indicating or recording elements,
> provision shall be made to either indicate or record a zero-balance
> condition.
>
> \(b\) On an automatic-indicating scale or balance indicator, provision
> shall be made to indicate or record an out‑of-balance condition on
> both sides of zero.
>
> \(c\) A zero-balance condition may be indicated by other than a
> continuous digital zero indication, provided that an effective
> automatic means is provided to inhibit a weighing operation or to
> return to a continuous digital indication when the scale is in an
> out‑of‑balance condition **[and is marked or includes supplemental
> indications or markings to indicate that the "other than digital zero
> indication" represents a no-load zero-balance condition of the
> scale]{.underline}.**

The NTETC Weighing Sector requested clarification from the S&T Committee
regarding scales and point‑of‑sale systems where the device's
zero-balance condition is represented by other than digital zero
indications such as scrolling messages (advertisements), dashes, or
other means. The Weighing Sector requested clarification on whether
scales with this feature require additional markings or indications that
inform customers that the scales are at a zero‑balance condition and are
being used properly according to General Code paragraph G-S.6. Marking
Operational Controls, Indications, and Features.

The reason for the Weighing Sector's request is that there is
disagreement among NIST Weights and Measures Division (WMD), the NTEP
laboratories, and manufacturers over the interpretation of NIST Handbook
44 General Code paragraph G-S.6. Marking Operational Controls,
Indications, and Features, Scales Code paragraph S.1.1. Zero Indication,
and the interpretation of the discussion included in the 78^th^ (1993)
NCWM Specifications and Tolerances Committee Item 320-1 S.1.1. Zero
Indication. This has resulted in inconsistent type evaluations and
weights and measures code enforcement for scales and point‑of‑sale
systems interfaced with scales that use methods such as screen savers,
power savers, scrolling displays, and modes of operation to indicate
that a device is at a zero-balance condition when no load is on the
scale.

NIST and some of the participating laboratories have stated that General
Code paragraph G-S.6 requires weighing devices to be marked or an
indication provided that states that zero-balance is represented by
other than a digital zero indication and that this interpretation is
supported by the Report of the 78^th^ of the NCWM Annual Meeting, S&T
Committee Item 320-1. Additionally, NCWM Publication 14 was amended in
2003 to include checklist procedures to verify that digital electronic
scales equipped with other than a continuous digital zero indication
comply. Other participating laboratories and some manufacturers state
that the markings are not necessary because Handbook 44 paragraph S.1.1.
(c) does not specifically state that the additional markings are
required and that the actions of the 78^th^ NCWM to amend paragraph
S.1.1.(c) provided sufficient customer protection for devices that use
this feature.

As stated earlier, NIST WMD believes that paragraph G-S.6. requires that
a weighing device must be marked or an indication provided that states
that zero-balance is represented by other than a digital zero indication
(e.g., a zero enunciator is provided or the scale is marked with
statements such as "scale at zero" or "scrolling message indicates the
scale is at zero"). Handbook 44 code paragraphs have also been adopted
for the purpose of providing customers with sufficient information to
make an informed decision during a direct sale weighing transaction as
follows:

1.10. General Code

G-S.5.2.2.(d) Digital Indication and Representation

G-S.5.2.4. Values.

G-S.5.3.1. On Devices That Indicate or Record in More Than One Unit

G-S.6. Marking Operational Controls, Indications, and Features

G-UR.3.3. Position of Equipment

2.20. Scales

S.1. Design of Indicating and Recording Elements and of Recorded
Representations

S.1.4. Indicators

S.1.5.4. Readability

S.1.8.3. Customer's Indications

S.1.12. Manual Gross Weight Entries

S.4.3. Multiple Load-Receiving Elements

Table S.6.3.b.Notes for Table S.6.3.a.; Note 13 -- A scale designed for
a special application . . . features."

NIST WMD also believed that changes were required to Scales Code
paragraph S.1.1.(c) to clarify the intent of the past S&T Committee and
to prevent further misinterpretation. The S&T Committee concurred with
this position and consequently proposed changes to paragraph S.1.1.(c)
as outlined above.

During the 2004 NCWM Interim Meeting, the Committee was briefed on some
ongoing discussions about zero indications within the Weighing Sector
for the past several years. The Weighing Sector was presented with a
retail scale using a touch screen with a screen saver that extends the
screen's life. The scale screen saver changes to display the indications
when the scale is off zero. In this example, the Weighing Sector agreed
there was no fraud, but the scale should display a zero indication prior
to a subsequent weighment. Because discussions are still ongoing, some
Weighing Sector members believe the proposal may be premature.

Weights and measures officials indicate there may be
"not-built-for-purpose" devices which do not comply with the proposed
interpretation. The "not-built-for-purpose" devices are interfaced with
approved devices; however, they continue weighing when off of zero.
Consequently, officials question whether the proposed changes to
paragraph S.1.1.(c) are intended to be nonretroactive requirements.

The Committee agreed that its interpretation of paragraph S.1.1.(c) is
consistent with the original intent. After hearing comments about how
some systems are designed to operate, the Committee recommended that
additional language is needed to clarify that no marking is required if
operator intervention is necessary to verify a zero condition before the
start of a transaction. The Committee made the proposal an information
item to provide sufficient time for input from the Weighing Sector,
which did not have the proposal available at its 2003 meeting and for
the development of suggested language to address operator intervention.

After the Weighing Sector reviews the proposal at its August
2004 meeting, the Committee plans to move the proposal forward as a
voting item on its 2005 agenda. The Committee believes this will provide
a record of how the requirement should be applied. The Committee
intended that all primary indicators must comply with paragraph S.1.1.,
therefore, the proposal should be a retroactive requirement.

###### 321 BELT-CONVEYOR SCALE SYSTEMS

####### 321-1 VC S.1.5. Rate of Flow Indicators and Recorders and UR.1. Use Requirements; Operated Capacity

(This item was adopted.)

**Source:** Western Weights and Measures Association (WWMA)

**Recommendation:** Amend paragraphs S.1.5. and UR.1. as follows:

> ***S.1.5. Rate of Flow Indicators and Recorders.** - A belt-conveyor
> scale shall be equipped with a rate of flow indicator and an analog or
> digital recorder. Permanent means shall be provided to produce an
> audio or visual signal when the rate of flow is equal to or less than
> **~~35 ~~[20 ]{.underline}%** and when the rate of flow is equal to or
> greater than **~~98 ~~[100 ]{.underline}**% of the rated capacity of
> the scale. The type of alarm (audio or visual) shall be determined by
> the individual installation.*
>
> *\[Nonretroactive as of January 1,1986\]*
>
> (Amended 1989 **[and 2004]{.underline})**
>
> **UR.1. Use Requirements. -** A belt-conveyor scale system shall be
> operated between **~~35~~[20 ]{.underline}**% and
> **~~98 ~~[100 ]{.underline}**% of its rated capacity.

(Amended 2004)

**Discussions:** During the 2002 Belt-Conveyor Scale Technical Seminar,
there was considerable discussion about harmonization of the NIST
Handbook 44 Belt-Conveyor Scale Systems Code with OIML R 50 Continuous
Totalizing Automatic Weighing Instruments. Preliminary data was
presented to provide evidence that belt-conveyor scales tested only at
zero and a single flow rate as specified by Handbook 44 may have
excessive errors at other flow rates.

Occasionally, there are periods of varying duration, when a scale
operates at different flow rates even though most belt-conveyor scales
tend to operate a majority of the time at relatively the same flow rate.
Other devices in Handbook 44 are tested throughout their rated operating
range; therefore, belt-conveyor scales should be subject to similar
testing to ensure accuracy at all ranges.

The WWMA heard comments in support of the proposal from a manufacturer
and user. The WWMA recommended that the NCWM S&T Committee move the
proposal forward as a voting item.

The Southern Weights and Measures Association supported this proposal as
written.

The Committee received additional industry support for the proposal as
written. The Committee recognized that the proposal was the result of
work by the Belt-Conveyor Scale Technical Seminar representatives, the
NIST Technical Advisor to the Seminar, and the WWMA.

The original proposal included a proposal to change the nonretroactive
date from 1986 to 2004. The Committee discussed the impact of changing
the nonretroactive enforcement date from 1986 to 2004. The Committee
agreed with NIST that such a change would make the requirement in
paragraph S.1.5. less restrictive than the current requirements. The
Committee agreed that systems installed prior to 2005 would already meet
the less restrictive requirement for a signal to indicate a rate of flow
outside of the 20 % to 100 % range of scale capacity. The Committee
acknowledged that it is acceptable for systems to operate within a range
that is narrower than the proposed 20 % to 100 % of the scale's capacity
as long as it complies with other Handbook 44 requirements.
Consequently, the Committee maintained the 1986 nonretroactive
enforcement date in paragraph S.1.5. and removed the proposed
requirement for different enforcement dates based on an installation
before or after January 1, 2005, from the proposal to modify paragraph
UR.1. The Committee agreed that the proposal with modifications was
ready for a vote as shown in the recommendation above.

####### 321-2 VC N.2. Conditions of Test, N.2.1. Initial Verification, N.2.2. Subsequent Verification, and N.2.3. Minimum Test Load

(This item was adopted.)

**Source:** Western Weights and Measures Association (WWMA)

**Recommendation**: Modify paragraph N.2. as follows:

> **N.2. Conditions of Test. -** A belt-conveyor scale shall be tested
> after it is installed on the conveyor system with which it is to be
> used and under such environmental conditions as may normally be
> expected. **~~It shall be tested at normal use capacity and may also
> be tested at any other rate of flow that may be used at the
> installation.~~** Each test shall be conducted **~~for~~ [with test
> loads no less than the minimum test load.]{.underline}**
>
> **(~~a) not less than 1000 scale divisions~~**
>
> **~~(b) at least three revolutions of the belt, and~~**
>
> **~~(c) at least 10 minutes of operation, or for a normal
> weighment.~~**

(Amended 1986 **[and 2004]{.underline}**)

Add new paragraphs N.2.1., N.2.2., and N.2.3., as follows:

> **[N.2.1. Initial Verification. - A belt-conveyor scale system shall
> be tested at an intermediate flow rate, near 35 % flow rates and
> normal use capacity. The system may also be tested at any other rate
> of flow that may be used at the installation.]{.underline}**

**[(Added 2004)]{.underline}**

> **[N.2.2. Subsequent Verification. - Subsequent testing shall include
> testing at the normal flow rate and other flow rates used at the
> installation. The official with statutory authority may determine that
> testing only at the normal flow rate is necessary for subsequent
> verifications if evidence is provided that the system is used to
> operate no less than 70 % of the maximum flow rate at least 80 % of
> the time, or that the range of the normal operational flow rate does
> not vary by more that 10 %, inclusive of the normal operational flow
> rate, (e.g. If the normal flow rate is 70 % an acceptable range can be
> 63 % to 73 %).]{.underline}**

**[(Added 2004)]{.underline}**

> **[N.2.3. Minimum Test Load. - The minimum test load shall not be less
> than the largest of the following values.]{.underline}**
>
> **[(a) 800 scale divisions,]{.underline}**
>
> **[(b) The load obtained at maximum flow rate in one revolution of the
> belt, or]{.underline}**
>
> **[(c) At least 10 minutes of operation.]{.underline}**
>
> **[The official with statutory authority may determine that a shorter
> time down to 2 % of the load totalized in one hour at the maximum flow
> rate may be used, provided that:]{.underline}**
>
> **[2 % of the load totalized in one hour at the maximum flow rate is
> greater than the time to achieve (a) and (b) and testing is performed
> that demonstrates that the system can perform within tolerances with
> both the shorter test time and with minimum totalized loads described
> in N.2.3. (a), (b), or (c).]{.underline}**

**[(Added 2004)]{.underline}**

**Discussion:** Participants at the 2002 NIST Belt Conveyor Scale
Systems Technical Seminar, developed a proposal that requires testing a
belt-conveyor scale at several flow rates to verify that it maintains
accuracy over a range of flow rates for a specific installation. The
seminar participants also developed guidelines for an appropriate
minimum test load.

Current NIST Handbook 44 test procedures do not clearly require tests at
flow rates other than the normal operating flow rate. Belt-conveyor
scales often operate at other flow rates for varying time periods and
thus need to provide accurate weighing at all flow rates.

The WWMA heard comments in support of this item from a manufacturer and
user. There was also a comment that a corresponding definition for
"minimum test load" would be redundant and may not be necessary. The
WWMA believes the proposal provides additional clarification of the
"minimum test load" thus eliminating the need to amend Appendix D
Definitions.

The Southern Weights and Measures Association supported the proposal as
written.

The Committee modified the proposal for paragraph N.2.3. to clarify the
amount of testing necessary when performing a shorter test so the time
period is sufficient in length and does not contribute to scale error.
The Committee concluded that defining terms such as "minimum test load,"
"initial verification," and "subsequent verification" is not necessary
since those terms are commonly used in reference to tests on many other
types of weighing devices and are thought to be well understood.

####### 321-3 VC N.3.1.2. Initial Stable Zero, N.3.1.3. Test of Zero Stability, and T.1.1. Tolerance Values-Test of Zero Stability

(This item was adopted.)

**Source:** Western Weights and Measures Association (WWMA)

**Recommendation:** Amend paragraphs N.3.1.2. and N.3.1.3 as follows:

> **N.3.1.2. Initial Stable Zero. -** The conveyor system shall be
> operated to warm up the belt and the belt scale shall be zero adjusted
> as required. A series of zero-load tests shall be carried out until
> three consecutive zero-load tests each indicate an error which does
> not exceed ± 0.06 % **~~of the full-scale capacity~~ [of the totalized
> load at full scale capacity for the duration of the
> test]{.underline}~~, or ± 1 division, whichever is less~~.** No
> adjustments can be made during the three consecutive zero-load test
> readings.
>
> (Added 2002) **[(Amended 2004)]{.underline}**
>
> **N.3.1.3. Test of Zero Stability. -** The conveyor system shall be
> **~~run~~ [operated]{.underline}** to warm up the belt and the belt
> scale shall be zero adjusted as required. A series of zero-load tests
> shall be carried out immediately before the simulated or materials
> test until the three consecutive zero-load tests each indicate an
> error which does not exceed ± 0.06 % **~~of the full-scale capacity~~
> [of the totalized load at full scale capacity for the duration of the
> test]{.underline}~~, or ± 1 division, whichever is less~~.** No
> adjustments can be made during the three consecutive zero-load test
> readings.
>
> **~~Immediately after material has been weighed over the belt-conveyor
> scale during the conduct of the materials test, the zero-load test
> shall be repeated. The zero error from this test shall not exceed ±
> 0.12 % of the full-scale capacity or ± 2 divisions, whichever is
> less.~~**

(Added 2002) **[(Amended 2004)]{.underline}**

Add a new paragraph T.1.1. Tolerance Values -- Test of Zero Stability as
follows:

> [**T.1.1. Tolerance Values -- Test of Zero Stability.** --
> **Immediately after material has been weighed over the belt-conveyor
> scale during the conduct of the materials test, the zero-load test
> shall be repeated. The change in the accumulated or subtracted weight
> on the Master Weight Totalizer during the zero test shall not exceed
> 0.12 % of the totalized load at full scale capacity for the duration
> of the test.**]{.underline}

**[(Added 2004)]{.underline}**

**Discussion:** In 2002, paragraphs N.3.1.2. and N.3.1.3. were added to
the Belt-Conveyor Scale Systems Code to define a stable zero and
establish an acceptable variation in zero (zero error), when the system
is operated at a no load condition. The change was made, in part, to
make the code consistent with requirements in OIML R 50 Continuous
Totalizing Automatic Weighing Instrument. R 50 defines the allowable
zero error in terms of a percent of the totalized load at the system's
maximum flow-rate only for the time-period it takes to complete the
test. Current paragraphs N.3.1.2. and N.3.1.3. specify the allowable
zero error only as a percent of full scale capacity which can be a
rather large value and usually results in an error stated in scale
divisions since that value is the lesser of the two values. Some
comparisons of the allowable zero error in terms of scale divisions,
percent of full scale capacity, and percent of capacity for the test
duration are shown in the table below:

<table style="width:100%;">
<colgroup>
<col style="width: 9%" />
<col style="width: 6%" />
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 7%" />
<col style="width: 9%" />
<col style="width: 9%" />
<col style="width: 7%" />
<col style="width: 7%" />
<col style="width: 9%" />
<col style="width: 7%" />
</colgroup>
<tbody>
<tr class="odd">
<td colspan="12"><strong>Comparison of 0.06 % of Scale Capacity to
0.06 % of Test Load (TL)</strong></td>
</tr>
<tr class="even">
<td><p><strong>Full Scale Capacity (ton/</strong></p>
<p><strong>hour)</strong></p></td>
<td><p><strong>Belt Speed (ft/</strong></p>
<p><strong>min)</strong></p></td>
<td><p><strong>Belt</strong></p>
<p><strong>Load</strong></p>
<p><strong>(lb/ft)</strong></p></td>
<td><p><strong>Belt</strong></p>
<p><strong>Length</strong></p>
<p><strong>(ft)</strong></p></td>
<td><p><strong>Belt</strong></p>
<p><strong>Rev</strong></p>
<p><strong>Time</strong></p>
<p><strong>(rev/</strong></p>
<p><strong>min)</strong></p></td>
<td><p><strong>Time</strong></p>
<p><strong>Per</strong></p>
<p><strong>3 Rev</strong></p>
<p><strong>(min)</strong></p></td>
<td><p><strong>3 Rev</strong></p>
<p><strong>Load</strong></p>
<p><strong>(ton)</strong></p></td>
<td><p><strong>10</strong></p>
<p><strong>Min</strong></p>
<p><strong>Load</strong></p>
<p><strong>(ton)</strong></p></td>
<td><p><strong>“d”</strong></p>
<p><strong>Size</strong></p>
<p><strong>(ton)</strong></p></td>
<td><p><strong>Min</strong></p>
<p><strong>Test</strong></p>
<p><strong>Load</strong></p>
<p><strong>(ton)</strong></p></td>
<td><p><strong>0.06 %</strong></p>
<p><strong>of</strong></p>
<p><strong>Capacity</strong></p>
<p><strong>(ton)</strong></p></td>
<td><p><strong>0.06 %</strong></p>
<p><strong>of</strong></p>
<p><strong>TL</strong></p>
<p><strong>(ton)</strong></p></td>
</tr>
<tr class="odd">
<td>250</td>
<td>250</td>
<td>33.33</td>
<td>200</td>
<td>0.8</td>
<td>2.40</td>
<td>10.00</td>
<td>41.67</td>
<td>0.02</td>
<td>41.67</td>
<td>0.15</td>
<td>0.025</td>
</tr>
<tr class="even">
<td>500</td>
<td>300</td>
<td>55.56</td>
<td>250</td>
<td>0.83</td>
<td>2.50</td>
<td>20.83</td>
<td>83.33</td>
<td>0.05</td>
<td>83.33</td>
<td>0.3</td>
<td>0.05</td>
</tr>
<tr class="odd">
<td>650</td>
<td>300</td>
<td>72.22</td>
<td>225</td>
<td>0.75</td>
<td>2.25</td>
<td>24.38</td>
<td>108.33</td>
<td>0.1</td>
<td>108.33</td>
<td>0.39</td>
<td>0.065</td>
</tr>
<tr class="even">
<td>1000</td>
<td>650</td>
<td>51.28</td>
<td>1500</td>
<td>2.31</td>
<td>6.92</td>
<td>115.38</td>
<td>166.67</td>
<td>0.1</td>
<td>166.67</td>
<td>0.6</td>
<td>0.1</td>
</tr>
<tr class="odd">
<td>3000</td>
<td>700</td>
<td>142.86</td>
<td>1800</td>
<td>2.57</td>
<td>7.71</td>
<td>385.71</td>
<td>500.00</td>
<td>0.5</td>
<td>500.00</td>
<td>1.8</td>
<td>0.3</td>
</tr>
<tr class="even">
<td>5000</td>
<td>500</td>
<td>333.33</td>
<td>1800</td>
<td>3.6</td>
<td>10.8</td>
<td>900.00</td>
<td>833.33</td>
<td>0.5</td>
<td>900.00</td>
<td>3.0</td>
<td>0.57</td>
</tr>
<tr class="odd">
<td colspan="12">Rev= revolution min= minimum</td>
</tr>
</tbody>
</table>

The proposal modifies current Handbook 44 language to redefine the
maximum allowable change of zero that is more appropriate for the master
weight totalizer.

The Southern Weights and Measures Association supported the WWMA
proposal as written.

The Committee recognized that the proposal was the result of work by the
Belt-Conveyor Scale Technical Seminar representatives, the NIST
Technical Advisor to the Seminar, and the WWMA. The Committee made the
proposal a voting item.

The Belt-Conveyor Scale Technical Seminar participants originally
recommended use of tolerances expressed in scale divisions because it
was consistent with practices in the NIST Handbook 44 Scales Code and
possibly less confusing for officials and service agents. However,
industry noted that use of a tolerance that is based on a specific
number of divisions is not appropriate, and all references to tolerances
expressed in scale divisions should be removed from the proposal. NIST
WMD agreed with this position and believes that tolerances in terms of a
relative percentage error are correct and consistent with OIML
recommendations for belt-conveyor scales and similar instruments that
weigh dynamically.

The Committee agreed with comments from industry and concluded that the
use of a tolerance that is based on a specific number of divisions
results in a value that does not correspond to variances in the test
duration. A percentage tolerance value can be calculated regardless of
the test duration. Consequently, the proposal was modified to remove all
references to tolerance values in scale divisions.

####### 321-4 VC N.3.1.4. Check For Consistency of the Conveyor Belt Along Its Entire Length

(This item was adopted.)

**Source:** Western Weights and Measures Association (WWMA)

**Recommendation:** Modify paragraph N.3.1.4. as follows:

> **N.3.1.4. Check For Consistency of the Conveyor Belt Along Its Entire
> Length. -** After a zero-load test with flow rate filtering disabled,
> the totalizer shall not change more than **[±]{.underline}** three
> scale divisions from its initial indication during one complete belt
> revolution.

(Added 2002) **[(Amended 2004)]{.underline}**

**Discussion:** The intent of paragraph N.3.1.4. is to ensure that the
conveyor belt is consistent in weight throughout its entire length. To
meet this requirement, a belt must be the same size and thickness
throughout its entire length. The types of splices, belt material, and
construction are a major contributing factor to maintaining uniform belt
weight. During the stability tests, adjustments are made to the scale
totalizer to average the entire belt weight to provide a zero reading
over complete revolutions of the belt. The belt should not have
variances large enough to affect the tolerance of the weighed load
because a material test load seldom fully captures a complete revolution
of the belt and is not able to use the same averaging process that
occurs during the stability tests.

Different interpretations exist over the true value of three scale
divisions. The addition of the "±" (plus or minus) symbol will ensure
that all officials and commercial operators are reading, interpreting,
and applying the requirement consistently.

The Southern and Western Weights and Measures Associations supported the
proposal as written.

The Committee received additional industry support for the proposal as
written. The Committee recognized that the proposal was the result of
work by the NIST Belt-Conveyor Scale Technical Seminar representatives,
the NIST Technical Advisor to the Seminar, and the WWMA. Based on its
review of the issue and after hearing only favorable comments, the
Committee recommended the proposal for a vote.

####### 321-5 VC T.3.1.1. Effect on Zero-Load Balance

(This item was adopted.)

**Source:** Western Weights and Measures Association (WWMA)

**Recommendation:** Modify paragraph T.3.1.1. as follows:

> **T.3.1.1. Effect on Zero-Load Balance. -** The zero-load indication
> shall not change by more than **~~0.07 ~~[0.035 ]{.underline}**% of
> the rated capacity of the scale (without the belt) for a change in
> temperature of 10 °C (18 °F) at a rate not to exceed 5 °C (9 °F) per
> hour.
>
> **[(Amended 2004)]{.underline}**

**Discussion:** The current 0.07 % tolerance for change in the zero-load
indication was originally added to paragraph T.3.1.1. in 1986 to ensure
consistency between NIST Handbook 44 and R 76 Non-Automatic Weighing
Instruments. The 0.07 % value was recognized prior to the 1994 edition
of R 50 Continuous Totalizing Automatic Weighing Instrument, which
unlike the 1980 edition of R 50 it superseded, includes influence factor
testing.

The proposal amends paragraph T.3.1.1. to reduce the allowable variation
because of temperature effect on zero-load balance to harmonize the
requirements with the most current edition of OIML R 50. The appropriate
tolerance value for the effect of temperature on zero-load balance for a
belt-conveyor scale is 0.035 %. Modification of the tolerance would
require reevaluation of existing data for devices with "Active" NTEP
Certificates of Conformance to ensure those scales meet the more
stringent tolerance. Manufacturers contacted about the possibility of
the proposal requiring NTEP to reevaluate existing test data agreed that
aligning requirements with international standards held a higher
priority and also indicated the proposed tolerances can easily be met.

The WWMA and Southern Weights and Measures Association supported the
proposal as written. The WWMA acknowledged the proposal is a retroactive
requirement. The WWMA agreed that the proposal may require a
reevaluation of existing data for devices with "Active" Certificates of
Conformance.

The Committee received additional industry support for the proposal as
written. The Committee recognized that the proposal was the result of
work by the NIST Belt-Conveyor Scale Technical Seminar representatives,
the NIST Technical Advisor to the Seminar, and the WWMA. Based on its
review of the issue and after hearing only favorable comments, the
Committee recommended the proposal for a vote.

####### 321-6 VC UR.2.2.(b) Conveyor Installation; Live Portions of Scale

(This item was adopted.)

**Source:** Western Weights and Measures Association (WWMA)

**Recommendation:** Modify paragraph UR.2.2.(b) as follows:

> **UR.2.2. Conveyor Installation**
>
> **(b) Live Portions of Scale. -** All live portions of the scale shall
> be protected **~~by~~[with]{.underline}** appropriate guard devices
> **[and clearances, as recommended by the scale
> manufacturer,]{.underline}** to prevent accidental interference with
> the weighing operation. **[Also, see UR. 3.2.]{.underline}**
>
> **[(Amended 2004)]{.underline}**

**Discussion:** Existing installation requirements only provide
guidelines for using guards to prevent objects from obstructing the live
portions of the scale. Adequate clearance for live portions of the scale
is equally important to prevent materials or other objects from jamming
or impeding the free motion of moving components of metrological
criticality.

In the period following a routine installation, it may become evident
that scale components and/or the scale structure may need more clearance
due to the physical properties of materials or other environmental
factors at the site. A user requirement is necessary since installers
may not anticipate the future influence of these factors on the device's
performance.

The WWMA heard comments in support of this item from a manufacturer and
user. The WWMA further modified the proposal to reduce any ambiguity and
emphasize compliance with corresponding installation and operation
requirements in General Code paragraphs G-UR.2.1. Installation and
G-UR.3.1. Method of Operation.

The Southern Weights and Measures Association supported the proposal as
written.

The Committee received additional industry support for the proposal as
written. The Committee recognized that the proposal was the result of
work by the Belt-Conveyor Scale Technical Seminar representatives, the
NIST Technical Advisor to the Seminar, and the WWMA. Hearing no
opposition, the Committee made the proposal a voting item.

####### 321-7 VC UR.3.2.(b) Maintenance 

(This item was adopted.)

**Source:** Western Weights and Measures Association (WWMA)

**Recommendation:** Add a new paragraph UR.3.2.(b) as follows:

> **UR.3.2. Maintenance. -** Belt-conveyor scales and idlers shall be
> maintained and serviced in accordance with manufacturer's instructions
> and the following:
>
> \(a\) The scale and area surrounding the scale shall be kept clean of
> debris or other foreign material that can detrimentally affect the
> performance of the system.
>
> **[(b) There shall be provisions to ensure that weighed material does
> not adhere to the belt and return to the weighing area.]{.underline}**

**[(Added 2004)]{.underline}**

Renumber existing paragraphs UR.3.2.(b) through UR.3.2.(e) to become
UR.3.2.(c) through UR.3.2.(f).

**Discussion:** This proposal is intended to prevent the re-circulation
of previously weighed material that has accumulated on the belt. The
existing user requirements for belt maintenance only require clean up or
removal of debris or foreign material. When the material that is being
weighed as a saleable commodity is allowed to stick or freeze to a
conveyor belt, then the true weight of delivered product determined by
the scale can be affected since the weighed material adhering to the
belt may continue to be reweighed by the scale. Current requirements do
not include specific language to address this concern. Some possible
examples of mechanisms that can be used to prevent material from
adhering to the belt are a belt scraper installed at the head-pulley
and/or a secondary scraper elsewhere on the conveyor belt system.

The WWMA agreed with comments it heard in support of this item from a
manufacturer and user.

The Committee received additional industry support for the proposal as
written. The Committee recognized that the proposal was the result of
work by the NIST Belt-Conveyor Scale Technical Seminar representatives,
the NIST Technical Advisor to the Seminar, and the WWMA. Based on its
review of the issue and after hearing only favorable comments, the
Committee recommended the proposal for a vote.

###### 322 AUTOMATIC BULK WEIGHING SYSTEMS

####### 322-1 I Tolerances

**Source:** Carryover Item 322-1. This item originated from the
Northeastern Weights and Measures Association (NEWMA) and first appeared
on the Committee's 2002 agenda.

**Recommendation:** Delete paragraphs T.1.4., T.2., T.2.1, T.3.2. and
T.3.3. as follows:

> **~~T.1.4. To Tests Involving Digital Indications or
> Representations. - To the tolerances that would otherwise be applied,
> there shall be added an amount equal to one-half the value of the
> scale division. This does not apply to digital indications or recorded
> representations that have been corrected for rounding using error
> weights.~~**
>
> **~~T.2. Minimum Tolerance Values. - The minimum tolerance value shall
> not be less than half the value of the scale division.~~**
>
> **~~T.2.1. For Systems used to Weigh Construction Materials. - The
> minimum maintenance and acceptance tolerance shall~~ ~~be 0.1 % of the
> weighing capacity of the system, or the value of the scale division,
> whichever is less~~.**
>
> **~~T.3.2. For Systems used to Weigh Grain. - The basic maintenance
> tolerance shall be 0.1 % of test load.~~**
>
> **~~T.3.3. For all Other Systems. - The basic maintenance tolerance
> shall be 0.2 % of test load.~~**

Renumber paragraph T.3. and renumber and modify T.3.1. as follows:

> **T.~~3~~.[2]{.underline}. Basic Tolerance Values.**
>
> **T.~~3~~.[2]{.underline}.1. Acceptance Tolerance. -** The basic
> acceptance tolerance shall be one-half the basic maintenance
> tolerance**[, but never less than 1 division.]{.underline}**

Add new paragraphs T.2.2., T.2.3., and T.2.3.1. and Table 1. and Table
2. as follows:

T.2.2. General. - The tolerance applicable to devices not marked with an
accuracy class shall have the tolerances applied as specified in
Table 1. below.

  ------------------------ ----------------------------- --------------------------- -----------------------------
  **[Table 1. Tolerance                                                              
  for Unmarked                                                                       
  Scales]{.underline}**                                                              

  **[Type of               **[Tolerance]{.underline}**   **[Decreasing Load          **[Other applicable
  Device]{.underline}**                                  Multiplier]{.underline}**   Requirements]{.underline}**

  **[Grain                 **[Class III, T.2.3 (table    **[1.0]{.underline}**       **[T.2.1.,
  Hoppers]{.underline}**   2)]{.underline}**                                         T.2.3.1]{.underline}**

  **[Other                 **[Class III L, T.2.3 (table  **[1.0]{.underline}**       **[T.2.1.,
  Systems]{.underline}**   2)]{.underline}**                                         T.2.3.1]{.underline}**
  ------------------------ ----------------------------- --------------------------- -----------------------------

[T.2.3. Tolerances Applicable to Devices Marked III or III
L.]{.underline}

> **[T.2.3.1. Maintenance Tolerance Values - The maintenance tolerance
> values are specified in Table 2 below.]{.underline}**

+-----------+--------------+-------------+--------------+--------------+
| **[Table  |              |             |              |              |
| 2.        |              |             |              |              |
| Ma        |              |             |              |              |
| intenance |              |             |              |              |
| Tolerance |              |             |              |              |
| for       |              |             |              |              |
| Marked    |              |             |              |              |
| Sca       |              |             |              |              |
| les]{.und |              |             |              |              |
| erline}** |              |             |              |              |
|           |              |             |              |              |
| **[(All   |              |             |              |              |
| values in |              |             |              |              |
| this      |              |             |              |              |
| table are |              |             |              |              |
| in scale  |              |             |              |              |
| divisio   |              |             |              |              |
| ns)]{.und |              |             |              |              |
| erline}** |              |             |              |              |
|           |              |             |              |              |
| **[       |              |             |              |              |
| Tolerance |              |             |              |              |
| in scale  |              |             |              |              |
| divisi    |              |             |              |              |
| ons]{.und |              |             |              |              |
| erline}** |              |             |              |              |
+-----------+--------------+-------------+--------------+--------------+
|           | **[1]{.      | **[2]{.u    | **[3]{.      | **[5]{.      |
|           | underline}** | nderline}** | underline}** | underline}** |
+-----------+--------------+-------------+--------------+--------------+
| **[Cl     | **[Test      |             |              |              |
| ass]{.und | Load]{.      |             |              |              |
| erline}** | underline}** |             |              |              |
+-----------+--------------+-------------+--------------+--------------+
| **[       | **[0 --      | **[501 -    | **[2001 -    | **[4001 +]{. |
| III]{.und | 500]{.       | 2000]{.u    | 4000]{.      | underline}** |
| erline}** | underline}** | nderline}** | underline}** |              |
+-----------+--------------+-------------+--------------+--------------+
| **[III    | **[0 --      | **[501 -    | **[(Add 1d   |              |
| L]{.und   | 500]{.       | 1000]{.u    | for each     |              |
| erline}** | underline}** | nderline}** | additional   |              |
|           |              |             | 500 d or     |              |
|           |              |             | fraction     |              |
|           |              |             | thereof)]{.  |              |
|           |              |             | underline}** |              |
+-----------+--------------+-------------+--------------+--------------+

Add a new footnote to Section 2.20 Scales Code Table 1.1. Tolerances for
Unmarked Scales as follows:

> **[^X^Automatic bulk weighing systems see Section 2.22 for
> specifications and tolerances.]{.underline}**

**Discussion:** Since 2002, the Committee has considered a proposal to
change the automatic bulk weighing systems tolerances from a percentage
basis to division values, which are based on the device's accuracy
class. The proposal was intended to align tolerances in the Automatic
Bulk Weighing Systems (ABWS) Code and the Scales Code.

The Committee has kept the proposal as an information item to allow
interested parties sufficient time to work through issues surrounding
the permissible system errors and other concerns. The U.S. Grain
Inspection, Packers and Stockyard Administration (GIPSA) indicated
opposition to the proposed tolerances because of concerns about the
allowable cumulative error in a system's performance. GIPSA also noted
that NEWMA indicated that some asphalt and cement plants use hopper
scales that are considered ABWS by officials because these devices are
capable of weighing single and multiple drafts, while other
jurisdictions classify these devices as hopper scales, which are held to
different tolerances. During past discussions, the Committee questioned
whether training would help clarify any confusion that exists over which
systems fall under the ABWS Code. The Committee noted that a hopper
modified to include a controller and is only capable of weighing several
drafts is an automated hopper, not an ABWS.

*Grain Inspection, Packers and Stockyard Administration (GIPSA)
Position*

GIPSA submitted the following position to the Committee for
consideration. In 1986 when the ABWS Code was established those systems
were recognized as a special type and design. The tolerances for grain
scales in this code were kept as a percentage so they would be
proportional throughout the entire test load. The proposed step
tolerance structure is not proportional throughout the system's entire
weighing range and would double the allowable tolerance for test loads
in some scale configurations. GIPSA believes the proposed structure
might encourage scale owners to inappropriately select a scale
configuration that permits the greater tolerance. Furthermore under the
proposed step tolerance structure, if some weights and measures
jurisdictions do not apply the tolerance to the grain and test weights
(test load) when conducting substitution tests, then the allowable error
doubles up through the entire system's capacity.

Since 1986, the ABWS Code percentage tolerance for grain scales has
served the grain industry well and there has not been any interest in
changing the tolerance structure. In view of GIPSA's 17-year history of
successful implementation of the ABWS Code in grain scale applications
and the high level of understanding and acceptance of the code, GIPSA
believes that the rationale behind NEWMA's proposal does not warrant a
change to grain scale tolerances. GIPSA provided three comparison tables
to demonstrate its position. The tables are intended to show a
comparison of a 0.1 % tolerance and Table 6 Class III tolerance applied
to a 120 000 lb x 20 lb and 50 000 lb x 10 lb device, given a specific
amount of test weights and using the substitution test method during the
increasing load test.

<table style="width:100%;">
<colgroup>
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 6%" />
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 7%" />
<col style="width: 8%" />
<col style="width: 5%" />
<col style="width: 8%" />
<col style="width: 12%" />
</colgroup>
<tbody>
<tr class="odd">
<td colspan="12"><p>GIPSA Comparison of 0.1 % Tolerance to Accuracy
Class III Tolerances</p>
<p>120 000 lb x 20 lb ABWS</p></td>
</tr>
<tr class="even">
<td><p>Indicated</p>
<p>Grain</p>
<p>Weight</p>
<p>(lb)</p></td>
<td><p>Error</p>
<p>In Grain Weight</p>
<p>(lb)</p></td>
<td><p>Actual Grain</p>
<p>Weight</p>
<p>(lb)</p></td>
<td><p>Test</p>
<p>Weight</p>
<p>(lb)</p></td>
<td><p>Indicated</p>
<p>Weight</p>
<p>(lb)</p></td>
<td><p>Error for Indicated</p>
<p>Weigh-ment</p>
<p>(lb)</p></td>
<td><p>0.1 % Tolerance on Test</p>
<p>Weights</p>
<p>(lb)</p></td>
<td><p>Error</p>
<p>on</p>
<p>Accum-ulated</p>
<p>Test Load</p>
<p>(lb)</p></td>
<td><p>0.1 %</p>
<p>Tolerance on Accumu-lated</p>
<p>Test Load</p>
<p>(lb)</p></td>
<td><strong>n</strong></td>
<td><p>Class III</p>
<p>Tolerance</p>
<p>On Test</p>
<p>Weights</p>
<p>(lb)</p></td>
<td><p>Class III</p>
<p>Tolerance on Accumulated Test Load</p>
<p>(lb)</p></td>
</tr>
<tr class="odd">
<td>0</td>
<td>0</td>
<td>0</td>
<td>12000</td>
<td>11980</td>
<td>-20</td>
<td>20</td>
<td>-20</td>
<td>20</td>
<td>600</td>
<td>40<sup>b</sup></td>
<td>40<sup>b</sup></td>
</tr>
<tr class="even">
<td>11980</td>
<td>-20</td>
<td>12000</td>
<td>12000</td>
<td>23960</td>
<td>-20</td>
<td>20</td>
<td>-40<sup>a</sup></td>
<td>24</td>
<td>1200</td>
<td>40<sup>b</sup></td>
<td>40<sup>b</sup></td>
</tr>
<tr class="odd">
<td>23960</td>
<td>-40</td>
<td>24000</td>
<td>12000</td>
<td>35960</td>
<td>0</td>
<td>20</td>
<td>-40<sup>a</sup></td>
<td>36</td>
<td>1800</td>
<td>40<sup>b</sup></td>
<td>40<sup>b</sup></td>
</tr>
<tr class="even">
<td>35960</td>
<td>-40</td>
<td>36000</td>
<td>12000</td>
<td>47980</td>
<td>+20</td>
<td>20</td>
<td>-20</td>
<td>48</td>
<td>2400</td>
<td>40<sup>b</sup></td>
<td>60<sup>b</sup></td>
</tr>
<tr class="odd">
<td>47980</td>
<td>-20</td>
<td>48000</td>
<td>12000</td>
<td>60000</td>
<td>+20</td>
<td>20</td>
<td>0</td>
<td>60</td>
<td>3000</td>
<td>40<sup>b</sup></td>
<td>60</td>
</tr>
<tr class="even">
<td>60000</td>
<td>0</td>
<td>60000</td>
<td>12000</td>
<td>72000</td>
<td>0</td>
<td>20</td>
<td>0</td>
<td>72</td>
<td>3600</td>
<td>40<sup>b</sup></td>
<td>60<sup>c</sup></td>
</tr>
<tr class="odd">
<td>72000</td>
<td>0</td>
<td>72000</td>
<td>12000</td>
<td>84020</td>
<td>+20</td>
<td>20</td>
<td>+20</td>
<td>84</td>
<td>4200</td>
<td>40<sup>b</sup></td>
<td>100<sup>b</sup></td>
</tr>
<tr class="even">
<td>84000</td>
<td>+20</td>
<td>83980</td>
<td>12000</td>
<td>96000</td>
<td>0</td>
<td>20</td>
<td>+20</td>
<td>96</td>
<td>4800</td>
<td>40<sup>b</sup></td>
<td>100<sup>b</sup></td>
</tr>
<tr class="odd">
<td>96020</td>
<td>+20</td>
<td>96000</td>
<td>12000</td>
<td>108040</td>
<td>+20</td>
<td>20</td>
<td>+40</td>
<td>108</td>
<td>5400</td>
<td>40<sup>b</sup></td>
<td>100<sup>c</sup></td>
</tr>
<tr class="even">
<td>107900</td>
<td>+40</td>
<td>107860</td>
<td>12000</td>
<td>119920</td>
<td>+20</td>
<td>20</td>
<td>+60</td>
<td>120</td>
<td>6000</td>
<td>40<sup>b</sup></td>
<td>100<sup>c</sup></td>
</tr>
</tbody>
</table>

^a^ Error exceeds the current allowable 0.1 % tolerance

^b^ Value expressed as an Accuracy Class III tolerance is greater than
the current ABWS Code 0.1 % tolerance

^c^ Value expressed as an Accuracy Class III tolerance is less than the
current ABWS Code 0.1 % tolerance

<table style="width:100%;">
<colgroup>
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 7%" />
<col style="width: 7%" />
<col style="width: 0%" />
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 8%" />
<col style="width: 5%" />
<col style="width: 8%" />
<col style="width: 10%" />
</colgroup>
<tbody>
<tr class="odd">
<td colspan="13"><p>GIPSA Comparison of 0.1 % Tolerance to Accuracy
Class III Tolerances</p>
<p>50 000 lb x 10 lb ABWS</p></td>
</tr>
<tr class="even">
<td><p>Indicated</p>
<p>Grain</p>
<p>Weight</p>
<p>(lb)</p></td>
<td><p>Error</p>
<p>In Grain Weight</p>
<p>(lb)</p></td>
<td><p>Actual Grain</p>
<p>Weight</p>
<p>(lb)</p></td>
<td colspan="2"><p>Test</p>
<p>Weight</p>
<p>(lb)</p></td>
<td><p>Indicated</p>
<p>Weight</p>
<p>(lb)</p></td>
<td><p>Error for Indicated</p>
<p>Weigh-ment</p>
<p>(lb)</p></td>
<td><p>0.1 % Tolerance on Test</p>
<p>Weights</p>
<p>(lb)</p></td>
<td><p>Error</p>
<p>on</p>
<p>Accum-ulated</p>
<p>Test Load</p>
<p>(lb)</p></td>
<td><p>0.1 %</p>
<p>Tolerance on Accumu-lated</p>
<p>Test Load</p>
<p>(lb)</p></td>
<td><strong>n</strong></td>
<td><p>Class III</p>
<p>Tolerance</p>
<p>On Test</p>
<p>Weights</p>
<p>(lb)</p></td>
<td><p>Class III</p>
<p>Tolerance on Accumulated Test Load</p>
<p>(lb)</p></td>
</tr>
<tr class="odd">
<td>0</td>
<td>0</td>
<td>0</td>
<td>5000</td>
<td colspan="2">5010</td>
<td>+10</td>
<td>10</td>
<td>+10</td>
<td>10</td>
<td>500</td>
<td>10</td>
<td>10</td>
</tr>
<tr class="even">
<td>5010</td>
<td>+10</td>
<td>5000</td>
<td>5000</td>
<td colspan="2">10010</td>
<td>0</td>
<td>10</td>
<td>+10</td>
<td>10</td>
<td>1000</td>
<td>10</td>
<td>20<sup>b</sup></td>
</tr>
<tr class="odd">
<td>10020</td>
<td>+10</td>
<td>10010</td>
<td>5000</td>
<td colspan="2">15000</td>
<td>-20<sup>a</sup></td>
<td>10</td>
<td>-10</td>
<td>15</td>
<td>1500</td>
<td>10</td>
<td>20<sup>b</sup></td>
</tr>
<tr class="even">
<td>15020</td>
<td>-10</td>
<td>15030</td>
<td>5000</td>
<td colspan="2">20020</td>
<td>0</td>
<td>10</td>
<td>-10</td>
<td>20</td>
<td>2000</td>
<td>10</td>
<td>20</td>
</tr>
<tr class="odd">
<td>20020</td>
<td>-10</td>
<td>20030</td>
<td>5000</td>
<td colspan="2">25010</td>
<td>-10</td>
<td>10</td>
<td>-20</td>
<td>25</td>
<td>2500</td>
<td>10</td>
<td>30<sup>b</sup></td>
</tr>
<tr class="even">
<td>25030</td>
<td>-20</td>
<td>25050</td>
<td>5000</td>
<td colspan="2">30010</td>
<td>-20<sup>a</sup></td>
<td>10</td>
<td>-40<sup>a</sup></td>
<td>30</td>
<td>3000</td>
<td>10</td>
<td>30</td>
</tr>
<tr class="odd">
<td>30030</td>
<td>-40</td>
<td>30070</td>
<td>5000</td>
<td colspan="2">35030</td>
<td>0</td>
<td>10</td>
<td>-40<sup>a</sup></td>
<td>35</td>
<td>3500</td>
<td>10</td>
<td>30<sup>c</sup></td>
</tr>
<tr class="even">
<td>35030</td>
<td>-40</td>
<td>35070</td>
<td>5000</td>
<td colspan="2">40030</td>
<td>0</td>
<td>10</td>
<td>-40</td>
<td>40</td>
<td>4000</td>
<td>10</td>
<td>30<sup>c</sup></td>
</tr>
<tr class="odd">
<td>40040</td>
<td>-40</td>
<td>40080</td>
<td>5000</td>
<td colspan="2">45040</td>
<td>0</td>
<td>10</td>
<td>-40</td>
<td>45</td>
<td>4500</td>
<td>10</td>
<td>50<sup>b</sup></td>
</tr>
<tr class="even">
<td>45040</td>
<td>-40</td>
<td>45080</td>
<td>5000</td>
<td colspan="2">50030</td>
<td>-10</td>
<td>10</td>
<td>-50</td>
<td>50</td>
<td>5000</td>
<td>10</td>
<td>50</td>
</tr>
</tbody>
</table>

^a^ Error exceeds the current allowable 0.1 % tolerance

^b^ Value expressed as an Accuracy Class III tolerance is greater than
the current ABWS Code 0.1 % tolerance

^c^ Value expressed as an Accuracy Class III tolerance is less than the
current ABWS Code 0.1 % tolerance

+-----------------+----------+---------------+------------------------+
| GIPSA           |          |               |                        |
| Comparison of   |          |               |                        |
| 0.1 % Tolerance |          |               |                        |
| to Accuracy     |          |               |                        |
| Class III       |          |               |                        |
| Tolerances      |          |               |                        |
|                 |          |               |                        |
| For Typical     |          |               |                        |
| ABWS Used in    |          |               |                        |
| Grain Weighing  |          |               |                        |
+=================+==========+===============+========================+
| Scale Capacity  | Test     | Current       | Proposed Accuracy      |
| x division      | Load     | Handbook 44   | Class III Tolerances   |
|                 |          | Tolerance     |                        |
|                 | (lb)     |               | \[accumulated test     |
|                 |          | (lb)          | load tolerance\]\      |
|                 |          |               | (lb)                   |
+-----------------+----------+---------------+------------------------+
| 5,000 lb x 0.5  | 500      | 0.5           | 1                      |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 5,000    | 5             | 2.5 \[10\]             |
+-----------------+----------+---------------+------------------------+
| 5,000 lb x 1 lb | 500      | 1             | 1                      |
+-----------------+----------+---------------+------------------------+
|                 | 5,000    | 5             | 5 \[10\]               |
+-----------------+----------+---------------+------------------------+
| 5,000 lb x 2 lb | 500      | 2             | 2                      |
+-----------------+----------+---------------+------------------------+
|                 | 5,000    | 5             | 6 \[20\]               |
+-----------------+----------+---------------+------------------------+
| 10,000 lb x 1   | 1,000    | 1             | 2                      |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 10,000   | 10            | 5 \[20\]               |
+-----------------+----------+---------------+------------------------+
| 10,000 lb x 2   | 1,000    | 2             | 2                      |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 10,000   | 10            | 10 \[20\]              |
+-----------------+----------+---------------+------------------------+
| 10,000 lb x 5   | 1,000    | 5             | 5                      |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 10,000   | 10            | 10 \[50\]              |
+-----------------+----------+---------------+------------------------+
| 20,000 lb x 2   | 2,000    | 2             | 4                      |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 20,000   | 20            | 5 \[40\]               |
+-----------------+----------+---------------+------------------------+
| 20,000 lb x 5   | 2,000    | 5             | 5                      |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 20,000   | 20            | 15 \[50\]              |
+-----------------+----------+---------------+------------------------+
| 30,000 lb x 5   | 3,000    | 5             | 10                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 30,000   | 30            | 25 \[100\]             |
+-----------------+----------+---------------+------------------------+
| 30,000 lb x 10  | 3,000    | 10            | 10                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 30,000   | 30            | 30 \[100\]             |
+-----------------+----------+---------------+------------------------+
| 50,000 lb x 5   | 5,000    | 5             | 10                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 50,000   | 50            | 25 \[100\]             |
+-----------------+----------+---------------+------------------------+
| 50,000 lb x 10  | 5,000    | 10            | 10                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 50,000   | 50            | 50 \[100\]             |
+-----------------+----------+---------------+------------------------+
| 50,000 lb x 20  | 5,000    | 20            | 20                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 50,000   | 50            | 60 \[200\]             |
+-----------------+----------+---------------+------------------------+
| 75,000 lb x 10  | 7,500    | 10            | 20                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 75,000   | 75            | 50 \[200\]             |
+-----------------+----------+---------------+------------------------+
| 75,000 lb x 20  | 7,500    | 20            | 20                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 75,000   | 75            | 60 \[200\]             |
+-----------------+----------+---------------+------------------------+
| 100,000 lb x 10 | 10,000   | 10            | 20                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 100,000  | 100           | 50 \[200\]             |
+-----------------+----------+---------------+------------------------+
| 100,000 lb x 20 | 10,000   | 20            | 20                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 100,000  | 100           | 100 \[200\]            |
+-----------------+----------+---------------+------------------------+
| 100,000 lb x 50 | 10,000   | 50            | 50                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 100,000  | 100           | 100 \[500\]            |
+-----------------+----------+---------------+------------------------+
| 120,000 lb x 20 | 12,000   | 20            | 40                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 120,000  | 120           | 100 \[400\]            |
+-----------------+----------+---------------+------------------------+
| 120,000 lb x 50 | 12,000   | 50            | 50                     |
| lb              |          |               |                        |
+-----------------+----------+---------------+------------------------+
|                 | 120,000  | 120           | 150 \[500\]            |
+-----------------+----------+---------------+------------------------+

*Western Weights and Measures Association (WWMA) Position*

The WWMA remains concerned about the potential effects of the cumulative
errors associated with the proposed step tolerances and continues to
recommend that this item be withdrawn.

*Northeastern Weights and Measures Association (NEWMA) Position*

NEWMA does not intend the proposal to require that operators of grain
hopper scales replace their scales. NEWMA indicated there are apparent
similarities between a 0.1 % and Accuracy Class III tolerance
structures. NEWMA finds the tolerance structures are closely aligned,
yet slightly different at various points. Consequently, it will always
be possible to cite borderline examples where the test results at
selective test loads may produce differing "pass" or "fail" results on a
particular scale. This difference can work both ways where application
of percent tolerances may pass a scale when Class III tolerances would
fail that same device and vice versa.

NEWMA believes the 0.1 % tolerance structure in the current ABWS Code
emphasizes accuracy primarily at the device's lower capacity ranges.
Manufacturers may indicate they are only concerned with a device's
performance at 500 d because if the device can pass at that point then
it will pass throughout its entire capacity range. In contrast, the
Class III tolerance structure places an emphasis on accuracy at the
higher scale capacities, which is typically where the scale will be
used. For example, at 4000 d the Class III tolerance is actually 1 d
tighter than the 0.1 % tolerance. NEWMA finds these differences to be
minor.

The concerns heard in 1986 about a less stringent tolerance for loads
slightly above 500 d are not the same today because officials know how
to properly conduct a substitution test. This is due, in part, to work
in 2003 to clarify the definition for substitution test.

NEWMA provided the graph shown below to demonstrate the slight
differences in the scale tolerance structures. The graph includes a
plotted scale error of 0.12 %. NEWMA notes that it is unlikely that
either tolerance structure would result in a failure rate until the test
load exceeds 50 000 lb. The graph also includes a "load cell curve" that
often appears on high resolution electronic scales like those in the
GIPSA examples. NEWMA contends that, if you examine the population
rather than the individual scale, the overall outcome of a test will be
the same in the long run for both tolerance structures. It also is
unlikely that device users could take advantage of the tolerance if
adjustments are made as close as practicable to zero error.

![](media/image2.wmf)

NEWMA also contends that there is no significant difference in the
design of a manual hopper scale or a hopper scale used in an ABWS. NEWMA
does not see manufacturers offer two different models of hopper or use
different load cells based on whether or not a device is evaluated under
the Scales Code or ABWS Code. History seems to indicate that the 0.1 %
tolerance was retained in the ABWS Code in 1986 not because these were
unique devices, but primarily because it was too great of a change for
many at that time. History also indicates that the 5 d tolerance step
for Accuracy Class III was a compromise to those who did not want to
lose the 0.1 % tolerance structure and the use of scales with small
division sizes. NEWMA believes that in 1986 a majority of ABWSs were
mechanical analog devices, whereas today they are predominantly
electronic.

NEWMA noted that the change in applicable tolerances from 0.1 %
tolerance to an Accuracy Class tolerance structure did not seem to pose
a significant problem for a large number of other weighing devices.
Between 1990 and 1993, the NCWM made a number of changes to the Scales
Code Table T.1.1. Tolerances for Unmarked Scales. These changes brought
most of the unmarked scales, initially grandfathered in 1986 at a 0.1 %
tolerance, under the Class III tolerance structure. As part of those
changes the old decreasing load multiplier was reduced from 1.5 to 1.0.
NEWMA does not remember significant increase in device rejections
following these transition periods.

NEWMA cites the major reason for its proposal is to make the application
of tolerances easier for the inspector. NEWMA finds that applying a
percent tolerance is difficult and somewhat subjective, since the
official is faced with the difficulty in understanding and correctly
applying the minimum tolerance and in dealing with rounding errors at
intermediate test loads. NEWMA believes that, if polled any group of
officials and asked them to make a tolerance chart for any given ABWS
device, you will probably get many different answers. NEWMA notes that
in GIPSA's first example there is a tolerance of 40 lb for a 24 000 lb
test load. However, the actual tolerance is 34 lb, if using direct
reading. Should one round up or round down? What if the test load is
20 000 lb with a 30 lb tolerance, which is right at the break point
between graduations? In this instance is the tolerance 20 lb or 40 lb?
Any confusion is eliminated under the proposed Accuracy Class tolerance
structure.

NEWMA offers what it believes is one more compelling reason to move to
Class III tolerance and that is international trade. The NCWM is
embarking on a careful effort to consider harmonizing U.S. requirements
with OIML requirements. NEWMA believes that all U.S. regulatory agencies
should be part of this process to get the United States aligned with the
rest of the world. If the U.S. system is better, then we should work
together to change OIML standards. If OIML requirements are as good as
U.S. requirements, then there is compelling reason under the OIML Treaty
to be part of the world community. Adopting Class III Tolerances would
bring the United States closer to international standards. Harmonization
not only affects the sale of measuring devices, but also their use. The
United States exports a great deal of grain to the world. Why shouldn't
the United States and the rest of the world have a single standard to
verify the measurement of grain at all levels of commerce.

NEWMA welcomes the opportunity for more discussion with the S&T
Committee and GIPSA. NEWMA strongly believes that the very minor
differences in tolerance applications on a few borderline cases does not
justify having a unique code for a device that is identical in design
and performance to devices evaluated under the Scales Code. Anyone
wishing to discuss this proposal with NEWMA should contact Bill Wilson
(Clinton County, New York) at

518-565-4681, by fax at 518-565-4694, or by e-mail at
<wilsonperu@aol.com> or Ross Andersen (New York) at

518-457-3146, by fax at 518-457-5693, or by e-mail at
<ross.andersen@agmkt.state.ny.us>.

*NCWM S&T Committee Position*

The Committee wants to stress that a system must meet all ABWS Code
specifications such as interlocks and overfill sensors as well as
performance requirements. There is ongoing work to harmonize many U.S.
requirements with OIML standards; however, R 107 Discontinuous
Totalizing Automatic Weighing Instruments (Totalizing Hopper Weighers),
unlike the ABWS Code, requires a material test. The U.S. and OIML
procedures for substitution tests consider the use of error weights to
determine the scale's true performance and to avoid introducing
uncertainties in the test process. If error weights are not used, the
potential does exist for introducing additional error when the known
test load falls between tolerance break points in the accuracy class
structure.

The Committee heard testimony from GIPSA that all issues that might
arise from the proposal have not been examined, especially those
affecting the grain industry. GIPSA understands the need to harmonize
U.S. and OIML requirements, but recommended a closer examination of the
grain industry's concerns. The Committee believes that a U.S. National
Work Group (USNWG) should be given serious consideration as a possible
forum to work on suitable ABWS tolerances. USNWGs bring public and
private sector representatives together that have experience and
expertise in a particular device area to work to resolve items on a
limited and device specific agenda. NIST USNWGs have made great strides
and had multiple successes in tackling many device specific issues. The
Committee decided to keep the proposal an information item to allow
GIPSA, NEWMA, the grain industry, and all other parties affected by the
proposed changes to the ABWS tolerances additional time to compare data
and come to an amendable and appropriate solution for ABWS tolerances.

For more background information, refer to the 2002 and 2003 S&T Final
Reports.

###### 324 AUTOMATIC WEIGHING SYSTEMS

####### 324-1 V Tentative Status of the Automatic Weighing Systems Code

(This item was adopted.)

**Source:** Carryover Item 324-1. (This item originated from the
Southern Weights and Measures Association (SWMA) and first appeared on
the Committee's 2002 agenda.)

**Recommendation:** Modify the Automatic Weighing Systems Code as shown
in Appendix B and change the status of the code from "tentative" to
"permanent".

**Discussion:** Since 2002, the Committee has considered a proposal to
change the status of the Automatic Weighing Systems (AWS) Code from
"tentative" to "permanent" to provide up-to-date appropriate
requirements that can be enforced by weights and measures officials. The
item was maintained as an information item on the Committee's agenda to
provide time for the AWS Working Group to resolve issues with the limits
on units of measurement, inconsistencies in the text, and laboratory
tests. The Committee recognized that, although the AWS Working Group
addressed many issues, industry still had concerns about devices that
comply with NIST Handbook 44, but generate packages that do not meet
NIST Handbook 133 requirements for net content.

At its September 2003 Annual Technical Conference, the WWMA heard
comments from manufacturers that continue to oppose changing the current
status of the tentative code because of allowable device errors
permitted in Handbook 44 that may present inconsistencies with package
lot requirements in Handbooks 130 and 133. A scale that complies with
Handbook 44 accuracy requirements, when used for packaging, may produce
package lots that do not meet allowable variance restrictions on net
contents under Handbook 133. The manufacturers recommended further work
by the AWS Working Group to resolve the remaining issues. The WWMA
considered a proposal to amend the application of the AWS code
exclusively to automatic weigh-labelers used in USDA facilities, but
concluded that this proposed solution would not eliminate the concerns
about packages checked at the point-of-pack. The WWMA recommended that
this item remain informational.

During the January 2004 NCWM Interim Meeting, the Committee reviewed a
proposal to amend the AWS Code that included modifications recommended
by the AWS Working Group as well as language that addressed
manufacturers" concerns expressed at the WWMA Annual Technical
Conference. Manufacturers indicated that with minor changes to this
alternate proposal the AWS Code is ready for permanent status. The
Committee agreed that the alternate proposal should be included as part
of this proposal to change the code status to permanent. The alternate
proposal to modify the AWS Code is included in Appendix B. The Committee
recognized that the AWS Working Group must be balloted on modifications
recommended by manufacturers. The Committee asked that the NIST
Technical Advisor to the AWS Working Group report on the results of the
work group's ballot and any further modifications beyond editorial
changes become separate voting items at the July 2004 NCWM Annual
Meeting.

During the 2004 NCWM Annual Meeting, the Committee heard that the AWS
Working Group ballot result was 8 in favor to 1 against the alternate
proposal. The Scale Manufacturers Association (SMA) supported the
proposal as modified by the AWS Working Group. The Committee agreed that
it was acceptable to remove NTEP procedures from Handbook 44 and make
that information available to the type evaluation laboratories in the
upcoming 2005 edition of NCWM Publication 14.

For more background information, refer to the 2002 and 2003 S&T Final
Report.

###### 330 LIQUID-MEASURING DEVICES

####### 330-1 VC S.2.2.1. Multiple Measuring Elements With a Single Provision for Sealing

(This item was adopted.)

**Source:** Carryover Item 330-1. (This item originated from the
National Type Evaluation Technical Committee (NTETC) Measuring Sector
and first appeared on the Committee's 2003 agenda.)

**Recommendation:** Add a new paragraph to NIST Handbook 44, Section
3.30. Liquid-Measuring Devices S.2.2.1. Multiple Measuring Elements With
a Single Provision for Sealing as follows:

> ***[S.2.2.1. Multiple Measuring Elements with a Single Provision for
> Sealing. - A change to the adjustment of any measuring element shall
> be individually identified.]{.underline}***
>
> ***[\[Nonretroactive as of January 1, 2005\]]{.underline}***
>
> **[Note: Examples of acceptable identification of a change to the
> adjustment of a measuring element include but are not limited
> to:]{.underline}**

(a) **[a broken, missing, or replaced physical seal on an individual
    measuring element,]{.underline}**

(b) **[a change in a calibration factor for each measuring
    element,]{.underline}**

(c) **[display of the date of or the number of days since the last
    calibration event for each measuring element, or]{.underline}**

(d) **[a counter indicating the number of calibration events per
    measuring element]{.underline}.**

**Background/Discussion:** At its September 2003 Meeting, the Western
Weights and Measures Association (WWMA) expressed concern that the
integrity of all adjustments protected by the security means is lost
when a physical security seal is removed, replaced, broken, or damaged.
The WWMA recommended that this item remain informational until the NTETC
Measuring Sector addressed the WWMA concerns.

At its October 2003 Meeting, the NTETC Measuring Sector modified the
proposed language as shown above and agreed to forward it to the NCWM
S&T Committee for consideration at the 2004 NCWM Interim Meeting.

At its October 2003 Meeting, the SWMA supported the proposal as modified
by the 2003 NTETC Measuring Sector and agreed to recommend to the NCWM
S&T Committee that it consider the proposal as a voting item for the
2004 NCWM Annual Meeting.

> At the 2004 NCWM Interim Meeting, the Committee received comments from
> two weights and measures officials regarding the situation in which
> performance tests are conducted on a retail motor-fuel dispenser
> (RMFD) with multiple measuring elements and only a single sealing
> mechanism for all the measuring elements. \[This, extra time and
> effort is required to perform a reinspection of the dispenser.\] If
> one or more of the measuring elements fails the initial test and
> requires adjustment, at the time of reinspection, the field official
> has no way of knowing which measuring elements were actually adjusted
> and must perform at least an audit test on all of the measuring
> elements to verify that only those elements rejected on the initial
> inspection have been adjusted. The manufacturer of RMFDs that
> presently utilize this sealing option informed the Committee that his
> company has developed a means to indicate to field officials which
> measuring elements have been adjusted between an initial inspection
> and the reinspection of a rejected dispenser based on the requirements
> in the proposal. The Committee agreed to move the item forward, with a
> nonretroactive enforcement date of January 1, 2005, for a vote at the
> 2004 NCWM Annual Meeting.
>
> At their May 2004 meetings, the CWMA & NEWMA supported this item as
> presented.
>
> At the 2004 NCWM Annual Meeting the Committee heard no opposition to
> this item and agreed to recommend the item for a vote.

For more background information, refer to the 2003 S&T Final Report.

####### 330-2 VC S.4.4.2. Location of Marking Information; Retail Motor-Fuel Dispensers

(This item was adopted.)

**Source:** NIST Weights and Measures Division

**Recommendation:** Modify NIST Handbook 44, Section 3.30.
Liquid-Measuring Devices S.4.4.2. Location of Marking Information;
Retail Motor-Fuel Dispensers (RMFD) as follows:

> ***S.4.4.2. Location of Marking Information; Retail Motor-Fuel
> Dispensers. -** The required marking information in the General Code,
> Paragraph G-S.1. shall appear as follows:*

(a) *~~Placement of this information shall not be on a portion of the
    device that can be readily removed or interchanged without the use
    of a tool separate from the device.~~*

> ***[shall be within 24 to 60 inches from the base of the
> dispenser;]{.underline}***
>
> *(b) ~~The information shall appear 24 to 60 inches from the base of
> the dispenser when placed on the outside of the device.~~*

***[may be internal and/or external provided the information is
permanent and easily read;]{.underline}***

(c) ***~~When placed behind an access door or panel the information
    shall appear 24 inches to 60 inches from the base of the dispenser
    in a readily legible position. The use of a dispenser key shall not
    be considered a tool separate from the device.~~***

> ***[shall be on a portion of the device that cannot be readily removed
> or interchanged]{.underline} [( i.e., not on a service access
> panel)]{.underline}.***
>
> ***[Note: the use of a dispenser key or tool to access internal
> marking information is permitted.]{.underline}***
>
> *\[Nonretroactive as of January 1, 2003\]*
>
> (Added 2002) **[(Amended 2004)]{.underline}**

**Background/Discussion:** The language in the 2004 edition of NIST
Handbook 44, paragraph S.4.4.2.(c) would allow the placement of G-S.1.
Identification markings on a door or panel that is removable.
Additionally, the wording allowed placement of marking information
behind a panel that could be removed and easily exchanged through the
use of a key (e.g., lower meter access panels), but did not permit the
information to be located behind a panel that could be removed using
other means such as a removing a screw or moving a lever. The proposed
modifications to paragraph S.4.4.2. clarified the original intent,
whereby it is acceptable to place G-S.1. information on permanent
components located 24 inches to 60 inches above the base of the
dispenser within the dispenser cabinet; however, those components could
only be accessed by opening a door or panel that required the use of a
key or other tool separate from the device. Scales Code paragraph S.6.2.
Location of Marking Information included similar language that had
allowed for access of required marking information through the use of a
tool since 1989. The proposed changes make the access to marking
information requirement in both codes more consistent.

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) was notified that this item would be considered at
the 2003 meeting of the National Type Evaluation Committee (NTETC)
Measuring Sector and heard no other comments on this item. The WWMA
believed that there was insufficient justification to allow additional
tools separate from the device, other than a dispenser key, to be used
to access identification information and recommended that this item
remain developmental.

At its October 2003 Meeting, the NTETC Measuring Sector developed an
alternate proposal which clarified S.4.4.2. by reorganizing the format
of the paragraph. The proposal also recommended changing the maximum
height restriction for placement of the required marking information
from 60 inches to 72 inches from the base of the dispenser.

At its October 2003 Meeting, the SWMA concurred with the alternate NTETC
Measuring Sector proposal and agreed to forward it to the NCWM S&T
Committee for consideration with the recommendation that it be a voting
item on the 2004 NCWM S&T Committee's Agenda.

At the 2004 NCWM Interim Meeting, the S&T Committee received several
comments indicating that changing the maximum height restriction for
placement of the required marking information from 60 inches to
72 inches is unreasonable because many field officials would have
difficulty reading the required information if it were placed at a
height greater than 60 inches. There was general support for the
language submitted by the NTETC Measuring Sector provided the current
maximum height restriction at 60 inches is retained. The S&T Committee
modified the proposal and agreed to present the item for a vote at the
2004 NCWM Annual Meeting in July.

At its May 2004 meeting, the Northeastern Weights and Measures
Association developed an alternate proposal to the NCWM S&T to simplify
and clarify the language in S.4.4.2. and submitted it to the NCWM S&T
Committee with the recommendation that it be a voting item at the NCWM
Annual Meeting.

At the 2004 NCWM Annual Meeting, the Committee reviewed the alternate
NEWMA proposal. The Committee agreed it included the essential marking
information in a more clear and concise format and recommended it as a
voting item.

####### 330-3 W Table T.2. Accuracy Classes for Liquid Measuring Devices Table T.2. Accuracy Classes for Liquid Measuring Devices Covered in Section 3.30

(This item was withdrawn.)

**Source:** NIST Weights and Measures Division

**Recommendation:** Modify Accuracy Class 0.3 in NIST Handbook 44,
Section 3.30. Liquid-Measuring Devices Table T.2. as follows:

+-------+---------------------------------+--------+--------+--------+
| **    |                                 |        |        |        |
| Table |                                 |        |        |        |
| T.2.  |                                 |        |        |        |
| Acc   |                                 |        |        |        |
| uracy |                                 |        |        |        |
| Cl    |                                 |        |        |        |
| asses |                                 |        |        |        |
| for   |                                 |        |        |        |
| L     |                                 |        |        |        |
| iquid |                                 |        |        |        |
| Meas  |                                 |        |        |        |
| uring |                                 |        |        |        |
| De    |                                 |        |        |        |
| vices |                                 |        |        |        |
| Co    |                                 |        |        |        |
| vered |                                 |        |        |        |
| in**  |                                 |        |        |        |
|       |                                 |        |        |        |
| *     |                                 |        |        |        |
| *NIST |                                 |        |        |        |
| Han   |                                 |        |        |        |
| dbook |                                 |        |        |        |
| 44 Se |                                 |        |        |        |
| ction |                                 |        |        |        |
| 3     |                                 |        |        |        |
| .30** |                                 |        |        |        |
+-------+---------------------------------+--------+--------+--------+
| **Acc | **Application**                 | **Acce | *      | **S    |
| uracy |                                 | ptance | *Maint | pecial |
| Cl    |                                 | Toler  | enance | Test   |
| ass** |                                 | ance** | Toler  | Toler  |
|       |                                 |        | ance** | ance** |
+-------+---------------------------------+--------+--------+--------+
| 0.3   | Petroleum products including    | 0      | 0.3 %  | 0.     |
|       | large capacity motor fuel       | .~~2~~ |        | [4]{.u |
|       | devices (flow rates over        | [15 ]{ |        | nderli |
|       | 115 L/min (30 gpm))\*\*, heated | .under |        | ne}5 % |
|       | products at or greater than     | line}% |        |        |
|       | 50 °C asphalt at or below       |        |        |        |
|       | temperatures 50 °C, all other   |        |        |        |
|       | liquids not shown where the     |        |        |        |
|       | typical delivery is over 200 L  |        |        |        |
|       | (50 gal)                        |        |        |        |
+-------+---------------------------------+--------+--------+--------+

**Background/Discussion:** Currently NIST Handbook 44 Liquid-Measuring
Devices (LMD), Vehicle Tank-Meters (VTM), and Mass Flow Meters (MFM)
Codes include different tolerances for 0.3 Accuracy Class meters. This
creates a technical inconsistency among the codes. Tighter tolerances
are applied to vehicle-mounted meters than stationary meters even though
the same model of meter may be used to measure the same product in both
applications. There is no technical justification for this difference. A
similar inconsistency in tolerances is found between the MFM, LMD, and
VTM Codes. The proposed changes would result in the application of
slightly tighter acceptance tolerances to LMDs than are in the current
code. An alternate approach would be to broaden the tolerances in the
VTM code to correspond with the LMD and MFM codes and to provide equal
benefit to all applications of the same meter.

At its September 2003 Meeting, the Central Weights and Measures
Association (CWMA) concluded that further input is needed from
manufacturers of the effected devices to determine whether or not they
can meet tighter tolerances. The CWMA recommended that the National Type
Evaluation Technical Committee (NTETC) Measuring Sector review this item
and provide input.

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) was notified that this item was to be considered at
the 2003 meeting of the NTETC Measuring Sector and heard no other
comments on this item. The WWMA S&T Committee supports the concept that
the applicable tolerance should be equivalent with respect to products
measured through the same type and class of device regardless of its
installation (stationary or vehicle-mounted).

At its October 2003 Meeting, the Northeastern Weights and Measures
Association (NEWMA) did not support this proposal because it does not
promote harmonization with OIML R 117 Measuring Systems for Liquids
other than Water.

At its October 2003 Meeting, the NTETC Measuring Sector reviewed the
proposed change to Table T.2. The Sector agreed with the manufacturers
of turbine meters and mass flow meters attending the meeting that
tightening the tolerances for those meter types was inappropriate
because it would be not possible, or at least very difficult for those
meter types to comply. Uniformity across the codes is not sufficient
justification for changing the tolerances. Consequently, the Sector
voted to oppose the proposed changes to the tolerances.

At its September 2003 Meeting, the Southern Weights and Measures
Association (SWMA) S&T Committee agreed with the NTETC Measuring Sector
and withdrew this item from its agenda.

At the 2004 NCWM Interim Meeting, the S&T Committee heard considerable
opposition to changing the tolerances in the LMD Code. The suggestion
was made that the S&T Committee begin to investigate harmonizing the
Handbook 44 tolerances for liquid-measuring devices with those of
Measurement Canada and those in OIML R 117 Measuring Systems for Liquids
other than Water. The Committee agreed to withdraw item 330-3 from the
S&T Committee Agenda for the 2004 NCWM Annual Meeting and recommended
that the NCWM consider harmonizing Handbook 44 tolerances for
liquid-measuring devices with Measurement Canada and OIML requirements
and recommendations.

####### 330-4 W UR.2.5. Product Identification

(This item was withdrawn.)

**Source:** Carryover Item 330-4. (This item originated from the
National Type Evaluation Technical Committee (NTETC) Measuring Sector
and first appeared on the Committee's 2003 agenda.)

**Recommendation:** Modify NIST Handbook 44, Section 3.30.
Liquid-Measuring Devices UR.2.5. Product Storage Identification as
follows:

> **UR.2.5. Product ~~Storage~~ Identi­fication.**
>
> [UR.2.5.1. Measuring Element Identi­fication.]{.underline}

(a) [The measuring elements of any multi-product dispenser shall be
    permanently, plainly, and visibly identified as to product being
    measured.]{.underline}

(b) [When the measuring elements of any multi-product dispenser are
    marked by means of a color code, the color code key shall be
    con­spicuou­sly displayed at the place of business and be consistent
    with the color code used for product storage.]{.underline}

> [(Added 200X)]{.underline}
>
> **[UR.2.5.2. Product Storage Identi­fication.]{.underline}**

(a) The fill connection for any petroleum product storage tank or vessel
    supplying motor-fuel devices shall be permanently, plainly, and
    visibly marked as to product contained.

(b) When the fill connection device is marked by means of a color code,
    the color code key shall be con­spicuously displayed at the place of
    business.

> (Added 1975 and Amended 1976 [and renumbered 200X]{.underline}**)**

**Background/Discussion:** At the June 2002 NTEP Laboratory Meeting, the
laboratories discussed the scenario in which field officials are
sometimes not able to determine which measuring element is associated
with a particular grade or blend of fuel on multi-product dispensers. In
this situation, the official does not know which measuring element to
mark or tag as rejected if only one grade or blend is rejected for not
meeting performance requirements, since many meters no longer have
visible external moving parts which indicate product flow. During the
performance of a subsequent inspection following adjustment or repair of
the device, the field official may be required to test all grades and
blends offered through the rejected dispenser to determine that only the
correct measuring element was adjusted.

At its September 2003 Meeting, the Central Weights and Measures
Association (CWMA) recommended that the NCWM S&T Committee withdraw this
item from its agenda because it will put an undue burden on current
retailers and will ultimately not help enforcement officials.

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) heard comments that the NTETC Measuring Sector would
be reviewing this item at their October 2003 meeting. The WWMA supported
the concept of the proposal and recommended that it remain an
information item until the NTETC Measuring Sector provides a specific
proposal to the NCWM S&T for consideration

At its October 2003 Meeting, the Northeastern Weights and Measures
Association (NEWMA) recommended that this proposal should remain an
information item.

At its October 2003 Meeting, the NTETC Measuring Sector determined that
it no longer supports this item because it addresses an enforcement
concern of only a limited number of jurisdictions and as such, does not
warrant a new Handbook 44 requirement. The NTETC Measuring Sector voted
to recommend that the NCWM S&T Committee withdraw this item from its
agenda.

At its October 2003 Meeting, the SWMA agreed to forward a recommendation
to the NCWM S&T Committee that this item be withdrawn from its agenda.

At the 2004 NCWM Interim Meeting, the Meter Manufacturers Association
indicated support for this item. A large manufacturer of retail
motor-fuel dispensers agreed with the CWMA and SWMA that this item would
place an extra burden on device owners without providing substantial
benefit to weights and measures official and should be withdrawn. The
S&T Committee also agreed with the CWMA and SWMA and decided to withdraw
Item 330‑4 from its agenda.

For more background information, refer to the 2003 S&T Final Report.

####### 330-5 VC Appendix D; Definition of Retail Device

(This item was adopted.)

**Source:** Carryover Item 330-6. (This item originated from the Western
Weights and Measures Association (WWMA) and first appeared on the
Committee's 1999 agenda.)

**Recommendation:** Modify the definition of retail devices as follows:

> **retail device.** A **[measuring]{.underline}** device **~~used for~~
> [primarily utilized to measure product for the purpose of sale to the
> end user.]{.underline}**
>
> **~~1. single deliveries of less than 378 L (100 gal),~~**
>
> **~~2. retail deliveries of motor fuels to individual highway
> vehicles, or~~**
>
> **~~3. single deliveries of liquefied petroleum gas for domestic use
> and liquefied petroleum gas or liquefied anhydrous ammonia for
> nonresale use.~~**
>
> (Amended 1987 **and 2004**) **\[[3.30 and]{.underline}** 3.32\]

**Background/Discussion:** Between 1999 and 2003, the Committee
considered several proposals that define retail devices as those that
deliver product to the final user. The Committee agreed that these
proposals change the classification of some devices, previously
classified as wholesale devices, to retail devices that are held to a
lesser tolerance.

At the Fall 2003 regional meetings, the CWMA, SWMA, and WWMA all agreed
to forward alternate proposals for definitions of the term "retail
device," that defined a retail device as a device primarily used for
non-resale use.

At its October 2003 Meeting, NEWMA did not support the proposal as
written. NEWMA believes that the definition of a retail device should be
based on quantity rather than application.

At the 2004 NCWM Interim Meeting one weights and measures official and a
retail motor-fuel dispenser manufacturer's representative indicated
support for the alternate proposal submitted by the SWMA. A
representative from the WWMA indicated that the WWMA believes that if a
device is used for any "retail" sales, even for a single delivery, it
should be considered a retail device and the applicable tolerances used.
The Committee disagreed with this position. The Committee believes that
weights and measures jurisdictions need some latitude in determining
when a device should be classified as wholesale or retail; therefore,
the Committee supported the alternative language submitted by the SWMA
and agreed to present Item 330-5 for a vote at the NCWM Annual Meeting
in July.

At the 2004 NCWM Annual Meeting, a railroad industry representative
expressed concern that references to retail devices are currently found
in only the LMD, LPG and Anhydrous Ammonia, and Mass Flow Meters Codes.
The individual believed that the term could also be applied to railway
track scales. A weights and measures official indicated that the
definition should be applicable to only liquid measuring devices. While
there may be merit to considering the use of the term for weighing
devices, the term is presently used only in Handbook 44 Sections 3.30,
3.32, and 3.37; consequently the Committee presented the item for a vote
as written.

For more background information, refer to the 1999 through 2003 S&T
Final Reports.

###### 331 VEHICLE-TANK METERS

####### 331-1 V Recognition of Temperature Compensation

(This item did not pass or fail; therefore, it returns to the
Committee.)

**Source:** Carryover Item 331-1 (This item originated from the Western
Weights and Measures Association (WWMA) and first appeared on the
Committee's 2000 agenda.)

**Recommendation:** Modify NIST Handbook 44, Section 3.31. Vehicle-Tank
Meters Code (VTM) by adding the following new paragraphs to recognize
temperature compensation as follows:

> **[S.2.4. Automatic Temperature Compensation for Refined Petroleum
> Products.]{.underline}**
>
> **[S.2.4.1. Automatic Temperature Compensation for Refined Petroleum
> Products. - A device may be equipped with an automatic means for
> adjusting the indication and registration of the measured volume of
> product to the volume at 15 °C (60 °F), where not prohibited by State
> Law.]{.underline}**
>
> **[S.2.4.2. Provision for Deactivating. - On a device equipped with an
> automatic temperature-compensating mechanism that will indicate or
> record only in terms of liters (gallons) compensated to 15 °C (60 °F),
> provision shall be made for deactivating the automatic
> temperature-compensating mechanism so that the meter can indicate and
> record, if it is equipped to record, in terms of the uncompensated
> volume.]{.underline}**
>
> **[S.2.4.2.1. Gross and Net Indications - A device equipped with
> automatic temperature compensation shall indicate and record, if
> equipped to record, both the gross (uncompensated) and net
> (compensated) volume for testing purposes. If both values cannot be
> displayed or recorded for the same test draft, means shall be provided
> to select either the gross or net indication for each test
> draft.]{.underline}**
>
> **[S.2.4.3. Provision for Sealing Automatic Temperature-Compensating
> Systems. - Adequate provision shall be made for an approved means of
> security (e.g., data change audit trail) or physically applying
> security seals in such a manner that an automatic
> temperature‑compensating system cannot be disconnected and that no
> adjustment may be made to the system.]{.underline}**
>
> **[S.2.4.4. Temperature Determination with Automatic Temperature
> Compensation. - For test purposes, means shall be provided (e.g.,
> thermometer well) to determine the temperature of the liquid
> either:]{.underline}**
>
> **[(a) In the liquid chamber of the meter, or]{.underline}**
>
> **[(b) Immediately adjacent to the meter in the meter inlet or
> discharge line.]{.underline}**

**[(Added 200X)]{.underline}**

> **[S.5.6. Temperature Compensation for Refined Petroleum Products. -
> If a device is equipped with an automatic temperature compensator, the
> primary indicating elements, recording elements, and recording
> representation shall be clearly and conspicuously marked to show that
> the volume delivered has been adjusted to the volume at 15 °C
> (60 °F).]{.underline}**
>
> **[(Added 200X)]{.underline}**
>
> **[N.4. Testing Procedures]{.underline}**
>
> **[N.4.1.3. Automatic Temperature-Compensating Systems for Refined
> Petroleum Products. - On devices equipped with automatic
> temperature-compensating systems, normal tests shall be
> conducted:]{.underline}**

(a) **[by comparing the compensated volume indicated or recorded to the
    actual delivered volume corrected to 15 °C (60 °F);
    and]{.underline}**

(b) **[with the temperature-compensating system deactivated, comparing
    the uncompensated volume indicated or recorded to the actual
    delivered volume.]{.underline}**

> **[The first test shall be performed with the automatic
> temperature-compensating system operating in the \"as found\"
> condition. On devices that indicate or record both the compensated and
> uncompensated volume for each delivery, the tests in (a) and (b) may
> be performed as a single test.]{.underline}**
>
> **[(Added 200X)]{.underline}**
>
> **[N.5. Temperature Correction for Refined Petroleum Products. -
> Corrections shall be made for any changes in volume resulting from the
> differences in liquid temperatures between the time of passage through
> the meter and time of volumetric determination in the prover. When
> adjustments are necessary, appropriate petroleum measurement tables
> should be used.]{.underline}**
>
> **[(Added 200X)]{.underline}**
>
> **T.2.1. [Automatic Temperature-Compensating Systems. - The difference
> between the meter error (expressed as a percentage) for results
> determined with and without the automatic temperature-compensating
> system activated shall not exceed:]{.underline}**
>
> **[(a) 0.4 %  for mechanical automatic temperature-compensating
> systems; and]{.underline}**
>
> **[(b) 0.2 %  for electronic automatic temperature-compensating
> systems.]{.underline}**
>
> **[The delivered quantities for each test shall be approximately the
> same size. The results of each test shall be within the applicable
> acceptance or maintenance tolerance.]{.underline}**
>
> **[(Added 200X)]{.underline}**
>
> **[UR.2.5. Temperature Compensation for Refined Petroleum
> Products.]{.underline}**
>
> **[UR.2.5.1. Automatic.]{.underline}**
>
> **[UR.2.5.1.1. When to be Used. - In a State that does not prohibit,
> by law or regulation, the sale of temperature-compensated product a
> device equipped with an operable automatic temperature compensator
> shall be connected, operable, and in use at all times. An electronic
> or mechanical automatic temperature-compensating system may not be
> removed, nor may a compensated device be replaced with an
> uncompensated device, without the written approval of the responsible
> weights and measures jurisdiction.]{.underline}**
>
> **[\[Note: This requirement does not specify the method of sale for
> product measured through a meter.\]]{.underline}**
>
> **[UR.2.5.1.2. Invoices. - An invoice based on a reading of a device
> that is equipped with an automatic temperature compensator shall show
> that the volume delivered has been adjusted to the volume at 15 °C
> (60 °F).]{.underline}**

**[(Added 200X)]{.underline}**

**Discussion/Background:** When this item was originally submitted,
weights and measures officials indicated confusion about the specific
meter applications that are covered by an NTEP Certificate of
Conformance for a meter that includes the temperature-compensation
feature. The WWMA acknowledged that there are jurisdictions that permit
temperature compensated deliveries in applications that are not
addressed by NIST Handbook 44. Other states do not allow the use of
automatic temperature compensation for the delivery of products using a
VTM.

At the 2003 NCWM Annual Meeting the Committee again heard comments both
in favor of and opposition to the item. The vote on the item did not
yield a sufficient number of aye or nay votes for the item to be
accepted or defeated and therefore it returned to the Committee for
further action.

At its September 2003 Meeting, the WWMA continued its strong support of
this item as proposed and agreed to recommend that the NCWM S&T
Committee move it forward as a voting item.

The NIST Weights and Measures Division (WMD) believes that, for
consistency with the requirements for liquified petroleum gas and for
uniformity throughout the industry, there should be a method of sale
requirement in Handbook 130 for refined petroleum products sold using
VTMs. Such a requirement would apply in states that adopt the Handbook
130 Method of Sale Regulation, provided it is not in conflict with other
existing state statutes.

At the 2004 NCWM Interim Meeting, the Meter Manufacturers Association
(MMA) indicated support for the proposal. One official indicated that
the item should remain an information item until the Method of Sale
Regulation in Handbook 130 requires the sale of petroleum products to
utilize temperature correction to the standard reference temperature of
60 ºF. Another official stated that not having standards and test
methods in the VTM Code of Handbook 44 creates a hardship for officials
in jurisdictions where temperature compensation is allowed and utilized
on VTMs delivering petroleum products and urged the NCWM to adopt this
proposal. The Committee agreed to present Item 331-1 for a vote at the
2004 NCWM Annual Meeting in July.

At their May 2004, meetings the CWMA & NEWMA supported item 331-1 as
proposed.

At the 2004 NCWM Annual Meeting, the MMA continued to support the
proposal. Several weights and measures official indicated that a
corresponding Handbook 130 requirement specifying the use of temperature
compensated meters for deliveries of petroleum products using a VTM
needs to be in place before this proposal moves forward.

The Committee stated its belief that the Specifications, Test Notes,
Tolerances, and User Requirements contained in the proposal are
technically correct and provide both the weights and measures inspector
and the NTEP laboratories with the proper criteria to use when
evaluating a VTM with temperature compensation capability.

The addition of this language to the VTM Code would not require,
approve, nor solicit any jurisdiction to either prohibit or accept the
use of temperature compensation in that jurisdiction.

The Committee further noted that the adoption of a nationally accepted
method of sale for temperature compensation by all jurisdictions would
not be obtainable in the foreseeable future and, thus, encouraged each
jurisdiction to adopt by either statute, rule, or regulation
requirements that state prohibit, permit or require temperature
compensation in their jurisdiction.

The Committee agreed that there were a sufficient number of states that
needed the proposal as an inspection tool to warrant adding the proposal
to NIST Handbook 44 at this time without waiting for method of sale
requirements to be added to NIST Handbook 130. Therefore the Committee
agreed to recommend the proposal for a vote.

For additional background on this item see the 2000 through 2003
NCWM S&T Final Reports.

####### 331-2 I N.4.2. Special Tests (Except Milk-Measuring Systems), N.4.5. Product Depletion Test, and T.5. Product Depletion Test

**Source:** Carryover Item 331-6. (This item originated from the
Northeastern Weights and Measures Association (NEWMA) and first appeared
on the Committee's 2003 agenda.)

**Recommendation:** Modify NIST Handbook 44, Section 3.31. Vehicle-Tank
Meters (VTM) Code, paragraph N.4.2. Special Tests (Except Milk-Measuring
Systems) and add new paragraphs N.4.5. Product Depletion Test and T.5.
Product Depletion Test to the Vehicle-Tank Meters Code as follows:

> **N.4.2. Special Tests (Except Milk-Measuring Systems). -** "Special"
> tests shall be made to develop the operating characteristics of a
> measuring system and any special elements and accessories attached to
> or associated with the device. Any test except as set forth in N.4.1.
> **[or N.4.5.]{.underline}** shall be considered a special test.
> Special test of a measuring system shall be made ~~as follows:~~
>
> ~~(a) A~~[a]{.underline}t a minimum discharge rate of 20 % of the
> marked maximum discharge rate or at the minimum discharge rate marked
> on the device whichever is less~~;~~[.]{.underline}
>
> **~~(b) To develop operating characteristics of the measuring system~~
> ~~during a split-compartment delivery~~.**

N.4.5. Product Depletion Test. - The effectiveness of the vapor
eliminator shall be tested by depleting the product supply and
continuing until the lack of fluid causes the meter register to stop
completely. The test shall be completed by switching to another
compartment with sufficient product on a multi-compartment vehicle, or
by adding sufficient product to a single compartment vehicle. When
adding product to a single compartment vehicle, allow appropriate time
for any entrapped vapor to disperse before continuing the test.

> **[(Added 200X)]{.underline}**
>
> **[T.5. Product Depletion Test. - The difference in the delivered
> volumes for the normal test and the product depletion test shall not
> exceed 0.5 % of the equivalent of one minute of flow at the maximum
> rated flow rate for the system]{.underline}.**
>
> **[(Added 200X)]{.underline}**

**Alternate Recommendation:** The National Type Evaluation Technical
Committee (NTETC) Measuring Sector recommended modifying NIST Handbook
44, Section 3.31. Vehicle-Tank Meters paragraph N.4.2. Special Tests
(Except Milk-Measuring Systems) and adding new paragraphs N.4.5. Product
Depletion Test and T.5. Product Depletion Test and Table T.5. Tolerances
for Product Depletion Tests to the Vehicle-Tank Meters Code as follows:

> **N.4.2. Special Tests (Except Milk-Measuring Systems). -** "Special"
> tests shall be made to develop the operating characteristics of a
> measuring system and any special elements and accessories attached to
> or associated with the device. Any test except as set forth in N.4.1.
> **[or N.4.5.]{.underline}** shall be considered a special test.
> Special tests of a measuring system shall be made ~~as follows:~~
>
> ~~**(a**)~~ **~~A~~**[a]{.underline}t a minimum discharge rate of 20 %
> of the marked maximum discharge rate or at the minimum discharge rate
> marked on the device whichever is less~~;~~[.]{.underline}
>
> **~~(b) To develop operating characteristics of the measuring system
> during a split compartment delivery.~~**

N.4.5. Product Depletion Test. - The effectiveness of the vapor
eliminator shall be tested by depleting the product supply and
continuing until the lack of fluid causes the meter indication to stop
completely for at least 10 seconds. If the meter indication fails to
stop completely for at least 10 seconds, continue to operate the system
for 3 minutes. The test shall be completed by switching to another
compartment with sufficient product on a multi-compartment vehicle, or
by adding sufficient product to a single compartment vehicle. When
adding product to a single compartment vehicle, allow appropriate time
for any entrapped vapor to disperse before continuing the test.

> **[(Added 200X)]{.underline}**
>
> **[T.5. Product Depletion Test. - The difference in the delivered
> volumes for the normal test and the product depletion test shall not
> exceed the tolerance shown in Table T.5. and all test results shall be
> within applicable tolerances.]{.underline}**

+-----------------------------------+-----------------------------------+
| **[Table T.5. Tolerances For      |                                   |
| Vehicle Tank Meters (Except Milk  |                                   |
| Meters)]{.underline}**            |                                   |
|                                   |                                   |
| **[On Product Depletion           |                                   |
| Tests]{.underline}**              |                                   |
+-----------------------------------+-----------------------------------+
| **[Manufacturer's rated capacity  | **[Maintenance and acceptance     |
| (Maximum gpm)]{.underline}**      | tolerances]{.underline}**         |
+-----------------------------------+-----------------------------------+
| **[Up to 125]{.underline}**       | **[125 in^3^]{.underline}**       |
+-----------------------------------+-----------------------------------+
| **[126-250]{.underline}**         | **[200 in^3^]{.underline}**       |
+-----------------------------------+-----------------------------------+
| **[251-500]{.underline}**         | **[300 in^3^]{.underline}**       |
+-----------------------------------+-----------------------------------+
| **[501 - 750]{.underline}**       | **[400 in^3^]{.underline}**       |
+-----------------------------------+-----------------------------------+
| **[Over 751]{.underline}**        | **[600 in^3^]{.underline}**       |
+-----------------------------------+-----------------------------------+

**Background/Discussion:** The proposal intends to recognize that the
measurement of vapor when product is depleted during the vehicle-tank
meter (VTM) split compartment test (product depletion test) is a system
problem and the amount of vapor measured is not related to the prover
size. The proposal also requires a split-compartment test (product
depletion test) for single compartment vehicles to verify the
performance of the air elimination mechanism. Currently paragraph
N.4.2.(b) refers only to a split-compartment delivery. The proposed
tolerance structure is based on the meter's flow rate such that the
tolerance for a given meter remains constant regardless of the size of
the test draft.

At the 2003 NCWM Interim Meeting, NEWMA noted concerns with the current
tolerances for a split compartment test (product depletion test) because
VTMs that fail tests completed in a jurisdiction using 100-gallon
provers are passing tests in neighboring jurisdictions that use larger
provers (i.e., 200-gallon). The Committee agreed the proposal has merit
because the product depletion test is necessary for vehicle-tank meters,
and the proposal provides guidelines on the appropriate test conditions.
Therefore, the Committee changed the status of this item from developing
to an information item.

The Committee is uncertain that all sizes of vehicle-tank meters can
attain the 0.5 % tolerance proposed for the difference in the test
results between the normal and product depletion tests. The Committee
asks for data that demonstrates the ability of VTMs to meet the proposed
tolerance. The Committee recommended that NEWMA consult with Measurement
Canada on its test procedures. Because tanks of different sizes drain at
different rates the Committee asked NEWMA to develop guidelines for
switching tanks when all tanks are not the same size.

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) heard no comments on this item. The WWMA is concerned
that the proposed tolerance for product depletion tests would allow
errors exceeding current applicable tolerances. Additionally, the WWMA
agreed with the NCWM S&T Committee that data is needed to demonstrate
that VTMs can attain the proposed tolerances. The WWMA recommended that
the item remain informational pending further development by New York
and the NTETC Measuring Sector.

At the October 2003 NEWMA Meeting, New York expressed concern that, in
the NEWMA proposal, the product depletion test would not be considered a
"special test" and that tolerances based on the agreement between the
normal tests and the product depletion tests might result in accepting
values outside the "special test" tolerances. Therefore, NEWMA proposed
that the exemption in paragraph N.4.2. stating "that the testing set
forth in paragraph N.4.5. shall not be considered a 'special test' " be
removed. NEWMA also submitted the following examples of product
depletion test results to further show the need for a product depletion
test tolerance that is not dependent on prover size. The table assumes
that error in the meter under normal test conditions is relatively
linear between a 100 gal and a 200 gal test and that the actual amount
of vapor passed for either test would remain approximately the same.

<table>
<colgroup>
<col style="width: 11%" />
<col style="width: 11%" />
<col style="width: 11%" />
<col style="width: 11%" />
<col style="width: 8%" />
<col style="width: 6%" />
<col style="width: 3%" />
<col style="width: 0%" />
<col style="width: 0%" />
<col style="width: 2%" />
<col style="width: 0%" />
<col style="width: 6%" />
<col style="width: 6%" />
<col style="width: 1%" />
<col style="width: 8%" />
<col style="width: 6%" />
<col style="width: 1%" />
</colgroup>
<tbody>
<tr class="odd">
<td colspan="17"><h2
id="examples-product-depletion-test---proposed">Examples: Product
Depletion Test - Proposed</h2></td>
</tr>
<tr class="even">
<td colspan="4"><h4 id="meter-marked-100-gpm-max20-gpm-min">Meter
Marked: 100 gpm Max/20 gpm Min</h4></td>
<td colspan="7">Proposed Product</td>
<td colspan="2"><h1 id="section"></h1></td>
<td><h1 id="section-1"></h1></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="odd">
<td>Tolerances:</td>
<td>Acceptance</td>
<td>Maintenance</td>
<td>Special Test</td>
<td colspan="7">Depletion Agreement</td>
<td colspan="2"></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td>100 gal prover</td>
<td>0.15 gal</td>
<td>0.3 gal</td>
<td>0.45 gal</td>
<td colspan="7">0.5 gal</td>
<td colspan="2"></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="odd">
<td>200 gal prover</td>
<td>0.30 gal</td>
<td>0.6 gal</td>
<td>0.90 gal</td>
<td colspan="7">0.5 gal</td>
<td colspan="2"></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="3"></td>
<td colspan="2"></td>
<td colspan="2"></td>
<td colspan="2"></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="odd">
<td colspan="13"><strong>Sample Test Results (Maintenance Tol.): Assume
linear error in normal tests and fixed passage of vapor</strong></td>
<td></td>
<td colspan="2"></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td>Expected</td>
<td></td>
<td>Expected</td>
<td></td>
<td colspan="3"></td>
<td colspan="2"></td>
<td colspan="3"></td>
<td></td>
<td colspan="3">Proposed</td>
</tr>
<tr class="odd">
<td>Error for Normal Test at 100 gal</td>
<td>Error for Normal Test at 200 gal</td>
<td>Error PD Test 100 gal</td>
<td>Error PD Test 200 gal</td>
<td>PD Agreement</td>
<td colspan="5">Normal Test P/F</td>
<td colspan="4">Special Test P/F</td>
<td colspan="3">Prod Depletion Agreement P/F</td>
</tr>
<tr class="even">
<td>(gal)</td>
<td>(gal)</td>
<td>(gal)</td>
<td>(gal)</td>
<td>gal</td>
<td>100 gal</td>
<td colspan="4">200 gal</td>
<td colspan="2">100 gal</td>
<td colspan="2">200 gal</td>
<td>100 gal</td>
<td colspan="2">200 gal</td>
</tr>
<tr class="odd">
<td>0.25</td>
<td>0.50</td>
<td>-0.25</td>
<td>1.00</td>
<td>-0.50</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Pass</td>
<td colspan="2">Pass</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="even">
<td>0.00</td>
<td>0.00</td>
<td>-0.50</td>
<td>0.50</td>
<td>-0.50</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Pass*</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="odd">
<td>-0.25</td>
<td>-0.50</td>
<td>-0.75</td>
<td>0.00</td>
<td>-0.50</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Fail</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="even">
<td>0.25</td>
<td>0.50</td>
<td>-0.45</td>
<td>1.20</td>
<td>-0.70</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Pass</td>
<td colspan="2">Pass</td>
<td>Fail</td>
<td colspan="2">Fail</td>
</tr>
<tr class="odd">
<td>0.00</td>
<td>0.00</td>
<td>-0.70</td>
<td>0.70</td>
<td>-0.70</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Pass*</td>
<td>Fail</td>
<td colspan="2">Fail</td>
</tr>
<tr class="even">
<td>-0.25</td>
<td>-0.50</td>
<td>-0.95</td>
<td>0.20</td>
<td>-0.70</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Fail</td>
<td>Fail</td>
<td colspan="2">Fail</td>
</tr>
<tr class="odd">
<td>0.25</td>
<td>0.50</td>
<td>-0.10</td>
<td>0.85</td>
<td>-0.35</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Pass</td>
<td colspan="2">Pass</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="even">
<td>0.00</td>
<td>0.00</td>
<td>-0.35</td>
<td>0.35</td>
<td>-0.35</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Pass</td>
<td colspan="2">Pass</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="odd">
<td>-0.25</td>
<td>-0.50</td>
<td>-0.60</td>
<td>-0.15</td>
<td>-0.35</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Fail</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="even">
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td colspan="4"></td>
<td colspan="2"></td>
<td colspan="2"></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td colspan="12"><strong>Sample Test Results (Acceptance Tol.): Assume
linear error in normal tests and fixed passage of vapor</strong></td>
<td colspan="2"></td>
<td></td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td>Expected</td>
<td></td>
<td>Expected</td>
<td></td>
<td colspan="3"></td>
<td colspan="2"></td>
<td colspan="2"></td>
<td colspan="2"></td>
<td colspan="3">Proposed</td>
</tr>
<tr class="odd">
<td>Error for Normal Test at 100 gal</td>
<td>Error for Normal Test at 200 gal</td>
<td>Error PD Test 100 gal</td>
<td>Error PD Test 200 gal</td>
<td>PD Agreement</td>
<td colspan="5">Normal Test P/F</td>
<td colspan="4">Special Test P/F</td>
<td colspan="3">Prod Depletion Agreement P/F</td>
</tr>
<tr class="even">
<td>(gal)</td>
<td>(gal)</td>
<td>(gal)</td>
<td>(gal)</td>
<td>gal</td>
<td>100 gal</td>
<td colspan="4">200 gal</td>
<td colspan="2">100 gal</td>
<td colspan="2">200 gal</td>
<td>100 gal</td>
<td colspan="2">200 gal</td>
</tr>
<tr class="odd">
<td>0.12</td>
<td>0.24</td>
<td>-0.38</td>
<td>0.74</td>
<td>-0.50</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Pass</td>
<td colspan="2">Pass</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="even">
<td>0.00</td>
<td>0.00</td>
<td>-0.50</td>
<td>0.50</td>
<td>-0.50</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Pass*</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="odd">
<td>-0.12</td>
<td>-0.24</td>
<td>-0.62</td>
<td>0.26</td>
<td>-0.50</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Pass*</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="even">
<td>0.12</td>
<td>0.24</td>
<td>-0.58</td>
<td>0.94</td>
<td>-0.70</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Pass</td>
<td colspan="2">Pass*</td>
<td>Fail</td>
<td colspan="2">Fail</td>
</tr>
<tr class="odd">
<td>0.00</td>
<td>0.00</td>
<td>-0.70</td>
<td>0.70</td>
<td>-0.70</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Pass*</td>
<td>Fail</td>
<td colspan="2">Fail</td>
</tr>
<tr class="even">
<td>-0.12</td>
<td>-0.24</td>
<td>-0.82</td>
<td>0.46</td>
<td>-0.70</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Pass*</td>
<td>Fail</td>
<td colspan="2">Fail</td>
</tr>
<tr class="odd">
<td>0.12</td>
<td>0.24</td>
<td>-0.23</td>
<td>0.59</td>
<td>-0.35</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Pass</td>
<td colspan="2">Pass</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="even">
<td>0.00</td>
<td>0.00</td>
<td>-0.35</td>
<td>0.35</td>
<td>-0.35</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Pass</td>
<td colspan="2">Pass</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="odd">
<td>-0.12</td>
<td>-0.24</td>
<td>-0.47</td>
<td>0.11</td>
<td>-0.35</td>
<td>Pass</td>
<td colspan="4">Pass</td>
<td colspan="2">Fail</td>
<td colspan="2">Pass*</td>
<td>Pass</td>
<td colspan="2">Pass</td>
</tr>
<tr class="even">
<td colspan="10">* Provides different result from 100 gal test.</td>
<td colspan="2"></td>
<td colspan="2"></td>
<td></td>
<td colspan="2"></td>
</tr>
</tbody>
</table>

At its October 2003 Meeting, the NTETC Measuring Sector reviewed a
change to Handbook 44 adopted at the 1974 NCWM which added Table 2. --
Tolerances For Vehicle Tank Meters on Supply Exhaustion Tests Except
Milk Meters to Section 3.31. Vehicle-Tank Meters code. The Sector agreed
that an additional flow rate designation should be added to the table to
recognize larger meter sizes currently manufactured, and to forward an
alternate proposal to modify NIST Handbook 44, Section 3.31 Vehicle-Tank
Meters to address Product Depletion Tests to the NCWM S&T Committee
through the SWMA.

At its October 2003 Meeting, the SWMA concurred with the NTETC Measuring
Sector's alternate proposal. The SWMA agreed to forward the proposal to
the NCWM S&T Committee for consideration with the recommendation that it
be a voting item on the NCWM S&T Committee's 2004 Agenda.

At the 2004 NCWM Interim Meeting, the Meter Manufacturers Association
(MMA) voiced support for the intent of the alternative proposal
submitted by the NTETC Measuring Sector provided T.4. is modified by
removing the words "and all test results shall be within applicable
tolerances." A Maryland Weights and Measures Official noted that the
proposal if modified as the MMA recommends, provides a substantial
change in tolerance; however, Maryland is in favor of the concept
because the tolerance for a given meter is not linked to the size of the
prover used for testing. A New York Official stated that a product
depletion test should be viewed as the test in which a "disturbance" is
introduced, similar to a test for the effect of radio frequency
interference (RFI) on a scale. New York preferred a tolerance expressed
as a flat percentage and suggested a tolerance of 0.5 % of the meter's
marked maximum flow rate rather than the step tolerances in the proposed
Table T.5. A representative from Measurement Canada indicated that there
is an opportunity for the United States and Canada to harmonize the
requirement for a product depletion test. Canada is currently using a
tolerance of 0.25 % of the meter's marked maximum flow rate applied to
the product depletion test results; however, Measurement Canada is still
conducting a study to determine if the 0.25 % tolerance is appropriate.
The Committee agreed that item 331-2 should remain an information item
and is returning the item to the NTETC Measuring Sector for further
development.

####### 331-3 I S.2.4. Zero Set-Back Interlock

**Source:** Southern Weights and Measures Association (SWMA)

**Recommendation:** Add a new paragraph S.2.4. to Handbook 44, Section
3.31. Vehicle-Tank Meters as follows:

> ***[S.2.4. Zero Set-Back Interlock, Vehicle-Tank Meters. -- A device
> shall be so constructed that after a delivery cycle has been
> completed, an automatic interlock system shall engage to prevent a
> subsequent delivery until the indicating and, if equipped, recording
> elements have been returned to their zero position.]{.underline}***
>
> ***[\[Nonretroactive as of January 1, 200X\]]{.underline}***

**Background/Discussion:** At its October 2003 Meeting, the SWMA
reviewed a proposal to add a specification requiring a zero set-back
interlock on vehicle-tank meters as shown above. The submitter commented
that this specification has been in place for retail motor-fuel
dispensers for many years. Its purpose is to prevent a second party from
being charged for product delivered to the first party. However, there
is no requirement for interlocks on Vehicle-Tank Meters. Currently the
only protection is provided by two User Requirements paragraphs, UR.2.3.
Ticket in Printing Device, which prohibits the "riding of tickets"
(having a ticket in the printer while the vehicle is moving from one
location to another) and UR.2.1. Return of Indication Element to Zero,
which requires the indications to be set to zero before a delivery. Both
of these requirements are extremely difficult, if not impossible to
enforce with the newer technology where printers are frequently mounted
in the cab of the vehicle and are not visible to an observer outside the
vehicle. The SWMA agreed to forward the proposal to the NCWM S&T
Committee for consideration with the recommendation that it be a
nonretroactive requirement.

At the 2004 NCWM Interim Meeting, the Meter Manufacturers Association
(MMA) stated that there was a need to have the ability to make multiple
deliveries at a single location or to one buyer without having to remove
a delivery ticket. The MMA supported the concept of the proposal
provided it was limited to devices with electronic indicators that have
the ability to print more than one delivery on a single delivery ticket.
Maryland Weights and Measures agreed with the MMA. The Committee agreed
that the proposal should remain an information item on the S&T Agenda to
allow the NTETC Measuring Sector and other interested parties time to
further develop the proposal.

At the 2004 NCWM Annual Meeting, the MMA stated that a zero set-back
interlock would be a desirable feature on systems with an electronic
indicator; however, it is not practical to add the feature to a system
with a mechanical indicator. While the proposal has merit and there
appears to be some support for the concept, the Committee recognized
from the comments that there are still a number of issues which need to
be resolved before the proposal is ready for a vote. Consequently, the
Committee referred the proposal back to the NTETC Measuring Sector for
further development.

###### 332 LPG AND ANHYDROUS AMMONIA LIQUID-MEASURING DEVICES

####### 332-1 W UR.2.3. Vapor-Return Line

(This item was withdrawn.)

**Source:** Carryover Item 332-2. (This item was developed by the
Southern Weights and Measures Association (SWMA) and first appeared on
the Committee's 2002 agenda.)

**Recommendation:** Modify NIST Handbook 44, Section 3.32. LPG and
Anhydrous Ammonia Liquid-Measuring Devices paragraph UR.2.3. as follows:

> **UR.2.3. Vapor Return Line -** During any metered delivery of
> liquefied petroleum gas from a supplier's tank to a receiving
> container, there shall be no vapor-return line from the receiving
> container to the supplier's tank **[except]{.underline}:**

(a) in the case of any receiving container to which normal deliveries
    can**[not]{.underline}** be made without the use of such
    vapor-return line, or

(b) in the case of any new receiving container when the ambient
    temperature is **~~below~~ [above]{.underline}** 90 °F**~~.~~ [,
    or]{.underline}**

> **[(c) in the case of wholesale terminal deliveries.]{.underline}**

**Background/Discussion:** At its September 2001 Annual Meeting, the
SWMA heard a concern from Tennessee that vapor-return lines are commonly
used at LPG loading rack terminals where large capacity transports are
loaded for distribution to bulk LPG dealers. At least some of the
operating terminals are applying industry-derived factors that are used
to credit customers for metered product that is returned as vapor to the
sellers' storage tanks. Paragraph U.R.2.3.(a) provides an exception that
allows the use of a vapor return line when abnormal conditions exist,
such as high pressure in the receiving tank, which would prevent
delivery without the use of a vapor return line. The SWMA questions
whether or not bulk terminal locations fall under this exemption. The
terminals where vapor-return lines are being used have insufficient
pumping ability to fill the large vessels that are used to distribute
LPG to bulk dealer facilities. When pumping capacity becomes an issue
the condition can be remedied by installing new pumping and metering
equipment which is capable of filling the large pressure vessels without
a vapor-return line. Additionally, the terminals have the option of
weighing the product rather than metering it. These conditions exist at
LPG terminals in all regions of the United States, thus, this is not a
unique situation only affecting the State of Tennessee.

SWMA agreed with Tennessee that the following options should be reviewed
and the appropriateness of using vapor return lines in these LPG filling
operations should be addressed:

1.  Allow loading rack terminals to use vapor-return lines and review a
    proposal from industry on applying the vapor factor to credit the
    purchaser. A mean credit value may be adequate, although it has been
    determined that the vapor returned is not always consistent from
    delivery to delivery.

2.  Allow a vapor meter to be installed between the receiving vessel and
    the seller's tanks, then convert the vapor measurements to liquid
    quantities and credit the purchaser.

3.  Provide a consensus opinion that bulk terminal loading-rack
    installations meet the exception contained in paragraph UR.2.3. (a)
    and no action is needed by weights and measures officials.

4.  Provide a consensus opinion that the conditions do not meet the
    exception noted in paragraph UR.2.3. and weights and measures
    officials should require terminals currently unable to load without
    vapor-return lines to take corrective action to comply with NIST
    Handbook 44.

Following the 2003 NCWM Interim Meeting, the Committee received
recommended changes to UR.2.3. from the State of Tennessee to address
the use of vapor return lines in wholesale terminal applications. The
Committee agreed the proposal should remain an information item to
provide the regional associations an opportunity to review and discuss
Tennessee's proposal. For clarity, the Committee modified Tennessee's
proposal to make the last sentence in the proposal a separate paragraph
(c) as shown in the recommendation above.

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) heard no comments on this item during its open
hearings. The WWMA S&T Committee expressed concerned that the proposal
does not include a means for compensating for product in a vapor state
that returns to the facilities' storage tank. The WWMA agreed with SWMA
option number 4, in which weights and measures officials should require
terminals currently unable to load without vapor-return lines to take
corrective action to comply with NIST Handbook 44. The WWMA agreed to
recommend that the NCWM S&T Committee withdraw this item from its
agenda.

At its October 2003 Meeting, the NEWMA recommended that this proposal
should remain an information item.

At its October 2003 Meeting, the SWMA did not include this item on its
agenda.

At the 2004 NCWM Interim Meeting, the NIST Weights and Measures Division
shared a concern with the Committee that allowing terminals to
selectively use or not use a vapor return line during tank filling
promotes non-uniformity in deliveries from one facility to another. The
Committee expressed a belief that all parties involved in the loading of
tank-trucks at the wholesale level understand the ramifications of using
a vapor return line and are willing to accept transactions that require
the use of a vapor return line. The Committee agreed to present Item
332‑1 for a vote at the 2004 NCWM Annual Meeting in July.

At the 2004 NCWM Annual Meeting a weights and measures official
expressed concern with the amount of product that can potentially be
transferred from the receiving tank to the supply tank when using a
vapor return line. Information provided from several sources indicated a
range of potential product transfer from 2.5 % to 2.8 % of the delivered
volume. The information provided during the open hearing regarding the
amount of vapor displaced during the filling process convinced the
Committee that selectively allowing the use of a vapor-return line
during a wholesale delivery may create considerable inequity in the
market place. The Committee agreed to withdraw Item 332-1 from its
agenda.

###### 358 MULTIPLE DIMENSION MEASURING DEVICES

####### 358-1 VC S.1.6. Customer Indications and Recorded Representations, Table S.1.6. Required Information to be Provided by Multiple Dimension Measuring Systems, UR.5. Customer Information Provided, and Table UR.5. Customer Information to be Provided

(This item was adopted.)

**Source:** Multiple Dimension Measuring Devices Working Group

**Recommendation:** Modify Handbook 44 Section 5.58. Multiple Dimension
Measuring Devices, paragraph S.1.6., delete the current Table S.1.6. and
replace it with a new Table S.1.6., and add new paragraph UR.5. and new
Table UR.5. as follows:

> **S.1.6. Customer Indications and Recorded Representations. -**
> Multiple dimension measuring **[devices or]{.underline}** systems must
> provide information as specified in Table S.1.6. **[As a minimum, all
> devices or systems must be able to meet either column I or column II
> in Table S.1.6.]{.underline} ~~(See Table Appendix at the end of this
> code.)~~**

**[(Amended 2004)]{.underline}**

+----------+-------------+---------------+----------------+-----------+
| *        |             |               |                |           |
| *~~Table |             |               |                |           |
| S.1.6.   |             |               |                |           |
| Inf      |             |               |                |           |
| ormation |             |               |                |           |
| to be    |             |               |                |           |
| Provided |             |               |                |           |
| on       |             |               |                |           |
| Multiple |             |               |                |           |
| D        |             |               |                |           |
| imension |             |               |                |           |
| M        |             |               |                |           |
| easuring |             |               |                |           |
| Sys      |             |               |                |           |
| tems~~** |             |               |                |           |
+==========+=============+===============+================+===========+
| **~~S    | *           | **~~Scenario  | **~~Scenario   | **~~      |
| cenarios | *~~Scenario | 1.2~~**       | 1.3~~**        | Scenarios |
| ~~**    | 1.1~~**     |               |                | 2, 3,     |
|          |             |               |                | 4~~**     |
+----------+-------------+---------------+----------------+-----------+
| **~~Inf  | *           | **~~Customer  | **~~Customer   | **~       |
| ormation | *~~Customer | present~~**   | present        | ~Customer |
| ~~**    | present~~** |               | (printer and   | is not    |
|          |             | **~~(display  | display)~~**   | pre       |
|          | *           | only)~~**     |                | sent.~~** |
|          | *~~(printer |               |                |           |
|          | only)~~**   |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **       | **~~P (only | **~~D (only   | **~~D or P     | **~~P or  |
| ~~System | in          | in            | (only in       | A~~**     |
| ID~~**   | m           | multi-system  | multi-~~**     |           |
|          | ulti-system | appl          |                |           |
|          | applic      | ications)~~** | **~~system     |           |
|          | ations)~~** |               | app            |           |
|          |             |               | lications)~~** |           |
+----------+-------------+---------------+----------------+-----------+
| **       | **~~N/A~~** | **~~N/A~~**   | **~~N/A~~**    | **~~P or  |
| ~~Object |             |               |                | A~~**     |
| ID~~**   |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **~~Di   | **~~P~~**   | **~~D~~**     | **~~D and      | **~~P or  |
| mensions |             |               | P~~**          | A~~**     |
| and/or   |             |               |                |           |
| volume,  |             |               |                |           |
| u        |             |               |                |           |
| nits~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| *        | **~~P~~**   | **~~D~~**     | **~~D and      | **        |
| *~~Error |             |               | P~~**          | ~~N/A~~** |
| indic    |             |               |                |           |
| ator~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **~      | **~~P~~**   | **~~D~~**     | **~~D or P~~** | **        |
| ~Billing |             |               |                | ~~N/A~~** |
| me       |             |               |                |           |
| thod~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **       | **~~P~~**   | **~~D~~**     | **~~D or P~~** | **        |
| ~~Billed |             |               |                | ~~N/A~~** |
| we       |             |               |                |           |
| ight~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| *        | **~~P~~**   | **~~D~~**     | **~~D or P~~** | **        |
| *~~Total |             |               |                | ~~N/A~~** |
| p        |             |               |                |           |
| rice~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **~~Dim  | **~~P~~**   | **~~D~~**     | **~~D or P~~** | **~~P or  |
| weight   |             |               |                | A~~**     |
| (if      |             |               |                |           |
| applica  |             |               |                |           |
| ble)~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| *        | **~~P~~**   | **~~D~~**     | **~~D or P~~** | **~~P or  |
| *~~Scale |             |               |                | A~~**     |
| weight   |             |               |                |           |
| (if      |             |               |                |           |
| applica  |             |               |                |           |
| ble)~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **~~Tare | **~~P~~**   | **~~D~~**     | **~~D or P~~** | **~~P or  |
| (if      |             |               |                | A~~**     |
| applica  |             |               |                |           |
| ble)~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **~~O    | **~~P~~**   | **~~D~~**     | **~~D or P~~** | **~~P or  |
| versized |             |               |                | A~~**     |
| indic    |             |               |                |           |
| ator~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **~~Di   | **~~P or    | **~~D or      | **~~D or P or  | **~~P or  |
| mensions | M~~**       | M~~**         | M~~**          | A~~**     |
| are of   |             |               |                |           |
| smallest |             |               |                |           |
| box~~**  |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **~      | **~~A~~**   | **~~A~~**     | **~~A~~**      | **~~P or  |
| ~Billing |             |               |                | A~~**     |
| rate or  |             |               |                |           |
| rate     |             |               |                |           |
| chart,   |             |               |                |           |
| co       |             |               |                |           |
| nversion |             |               |                |           |
| fac      |             |               |                |           |
| tors~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+
| **~~D =  |             |               |                |           |
| DISPL    |             |               |                |           |
| AYED~~** |             |               |                |           |
|          |             |               |                |           |
| **~~A =  |             |               |                |           |
| A        |             |               |                |           |
| VAILABLE |             |               |                |           |
| UPON     |             |               |                |           |
| REQUEST  |             |               |                |           |
| (        |             |               |                |           |
| retained |             |               |                |           |
| for at   |             |               |                |           |
| least    |             |               |                |           |
| 30 days  |             |               |                |           |
| after    |             |               |                |           |
| invo     |             |               |                |           |
| ice)~~** |             |               |                |           |
|          |             |               |                |           |
| **~~N/A: |             |               |                |           |
| NOT      |             |               |                |           |
| APPLIC   |             |               |                |           |
| ABLE~~** |             |               |                |           |
|          |             |               |                |           |
| **~~P =  |             |               |                |           |
| PRI      |             |               |                |           |
| NTED~~** |             |               |                |           |
|          |             |               |                |           |
| **~~M =  |             |               |                |           |
| MARKED   |             |               |                |           |
| ON THE   |             |               |                |           |
| DE       |             |               |                |           |
| VICE~~** |             |               |                |           |
+----------+-------------+---------------+----------------+-----------+

+--------------------------+---------+-----------+--------+----------+
| ##                       |         |           |        |          |
| ####### Table S.1.6. Req |         |           |        |          |
| uired Information to be  |         |           |        |          |
| Provided by Multiple Dim |         |           |        |          |
| ension Measuring Systems |         |           |        |          |
+--------------------------+---------+-----------+--------+----------+
| ######### Information    | **      | **[Column |        | *        |
|                          | [Column | I         |        | *[Column |
|                          | I\*]    | I\*]{.und |        | II       |
|                          | {.under | erline}** |        | I]{.unde |
|                          | line}** |           |        | rline}** |
+--------------------------+---------+-----------+--------+----------+
|                          | **[P    | **        |        | **[      |
|                          | rovided | [Provided |        | Provided |
|                          | by      | by        |        | by       |
|                          | device] | invoice   |        | invoice  |
|                          | {.under | or other  |        | or other |
|                          | line}** | me        |        | means as |
|                          |         | ans]{.und |        | s        |
|                          |         | erline}** |        | pecified |
|                          |         |           |        | in       |
|                          |         |           |        | con      |
|                          |         |           |        | tractual |
|                          |         |           |        | agreemen |
|                          |         |           |        | t]{.unde |
|                          |         |           |        | rline}** |
+--------------------------+---------+-----------+--------+----------+
|                          |         | #### [Cu  | **[Cu  |          |
|                          |         | stomer pr | stomer |          |
|                          |         | esent]{.u | not    |          |
|                          |         | nderline} | pres   |          |
|                          |         |           | ent]{. |          |
|                          |         |           | underl |          |
|                          |         |           | ine}** |          |
+--------------------------+---------+-----------+--------+----------+
| **[1 Device              | **[D or | *         | *      | **[P or  |
| identification           | P]      | *[P]{.und | *[P]{. | A]{.unde |
| ^1^]{.underline}**       | {.under | erline}** | underl | rline}** |
|                          | line}** |           | ine}** |          |
+--------------------------+---------+-----------+--------+----------+
| **[2 Error message (when | **[D or | *         | **[    | **[N/    |
| ap                       | P]      | *[P]{.und | N/A]{. | A]{.unde |
| plicable)]{.underline}** | {.under | erline}** | underl | rline}** |
|                          | line}** |           | ine}** |          |
+--------------------------+---------+-----------+--------+----------+
| **[3 Hexahedron          | **[D or | *         | *      | **[P or  |
| dime                     | P]      | *[P]{.und | *[P]{. | A]{.unde |
| nsions^2^]{.underline}** | {.under | erline}** | underl | rline}** |
|                          | line}** |           | ine}** |          |
+--------------------------+---------+-----------+--------+----------+
| **[4 Hexahedron volume   | **[D or | *         | *      | **[P or  |
| (if                      | P]      | *[P]{.und | *[P]{. | A]{.unde |
| used)^2^]{.underline}**  | {.under | erline}** | underl | rline}** |
|                          | line}** |           | ine}** |          |
+--------------------------+---------+-----------+--------+----------+
| **[5 Actual weight (if   | **[D or | *         | *      | **[P or  |
| used)^2^]{.underline}**  | P]      | *[P]{.und | *[P]{. | A]{.unde |
|                          | {.under | erline}** | underl | rline}** |
|                          | line}** |           | ine}** |          |
+--------------------------+---------+-----------+--------+----------+
| **[6 Tare (if            | **[D or | **[       | **[    | **[N/    |
| used)^2^]{.underline}**  | P]      | N/A]{.und | N/A]{. | A]{.unde |
|                          | {.under | erline}** | underl | rline}** |
|                          | line}** |           | ine}** |          |
+--------------------------+---------+-----------+--------+----------+
| **[7 Hexahedron          | **[D or | *         | *      | **[P or  |
| measurement statement    | P or    | *[P]{.und | *[P]{. | G]{.unde |
| ^3^]{.underline}**       | M]      | erline}** | underl | rline}** |
|                          | {.under |           | ine}** |          |
|                          | line}** |           |        |          |
+--------------------------+---------+-----------+--------+----------+
| **[D = DISPLAYED, P =    |         |           |        |          |
| PRINTED or RECORDED IN A |         |           |        |          |
| MEMORY DEVICE and        |         |           |        |          |
| AVAILABLE UPON REQUEST   |         |           |        |          |
| BY CUSTOMER ^4^, M =     |         |           |        |          |
| MARKED, G = PUBLISHED    |         |           |        |          |
| GUIDELINES OR CONTRACTS, |         |           |        |          |
| A = AVAILABLE UPON       |         |           |        |          |
| REQUEST BY CUSTOMER ^4^, |         |           |        |          |
| N/A = NOT                |         |           |        |          |
| A                        |         |           |        |          |
| PPLICABLE]{.underline}** |         |           |        |          |
|                          |         |           |        |          |
| **[Notes:]{.underline}** |         |           |        |          |
|                          |         |           |        |          |
| > **[1 This is only      |         |           |        |          |
| > required in systems    |         |           |        |          |
| > where more than one    |         |           |        |          |
| > device or measuring    |         |           |        |          |
| > element is being       |         |           |        |          |
| > used.]{.underline}**   |         |           |        |          |
|                          |         |           |        |          |
| 2.  **[Some devices or   |         |           |        |          |
|     systems may not      |         |           |        |          |
|     utilize all of these |         |           |        |          |
|     values; however as a |         |           |        |          |
|     minimum either       |         |           |        |          |
|     hexahedron           |         |           |        |          |
|     dimensions or        |         |           |        |          |
|     hexahedron volume    |         |           |        |          |
|     must be displayed or |         |           |        |          |
|                          |         |           |        |          |
|  printed.]{.underline}** |         |           |        |          |
|                          |         |           |        |          |
| 3.  **[This is an        |         |           |        |          |
|     explanation that the |         |           |        |          |
|     dimensions and/or    |         |           |        |          |
|     volume shown are     |         |           |        |          |
|     those of the         |         |           |        |          |
|     smallest hexahedron  |         |           |        |          |
|     in which the object  |         |           |        |          |
|     that was measured    |         |           |        |          |
|     may be enclosed      |         |           |        |          |
|     rather than those of |         |           |        |          |
|     the object           |         |           |        |          |
|                          |         |           |        |          |
|   itself.]{.underline}** |         |           |        |          |
|                          |         |           |        |          |
| 4.  **[The information   |         |           |        |          |
|     "available upon      |         |           |        |          |
|     request by customer" |         |           |        |          |
|     shall be retained by |         |           |        |          |
|     the party having     |         |           |        |          |
|     issued the invoice   |         |           |        |          |
|     for at least         |         |           |        |          |
|     30 calendar days     |         |           |        |          |
|     after the date of    |         |           |        |          |
|     i                    |         |           |        |          |
| nvoicing.]{.underline}** |         |           |        |          |
|                          |         |           |        |          |
| **[\* As a minimum all   |         |           |        |          |
| devices or systems must  |         |           |        |          |
| be able to meet either   |         |           |        |          |
| column I or column       |         |           |        |          |
| II.]{.underline}**       |         |           |        |          |
|                          |         |           |        |          |
| **[Hexahedron = An       |         |           |        |          |
| object with six          |         |           |        |          |
| rectangular, plane       |         |           |        |          |
| surfaces                 |         |           |        |          |
| (sides).]{.underline}**  |         |           |        |          |
+--------------------------+---------+-----------+--------+----------+
| **[(Amended              |         |           |        |          |
| 2004)]{.underline}**     |         |           |        |          |
+--------------------------+---------+-----------+--------+----------+

> **[UR.5. Customer Information Provided. - The user of a multiple
> dimension measuring device or system shall provide transaction
> information to the customer as specified in Table UR.5.]{.underline}**
>
> **[(Added 2004)]{.underline}**

+---------------------------------+-----------+--------------+--------+
| ######### Table UR.5            |           |              |        |
| . Customer Information Provided |           |              |        |
+---------------------------------+-----------+--------------+--------+
| **[Information]{.underline}**   | **[No     |              | **     |
|                                 | co        |              | [Contr |
|                                 | ntractual |              | actual |
|                                 | agreem    |              | agreem |
|                                 | ent]{.und |              | ent]{. |
|                                 | erline}** |              | underl |
|                                 |           |              | ine}** |
+---------------------------------+-----------+--------------+--------+
|                                 | **        | **[Customer  |        |
|                                 | [Customer | not          |        |
|                                 | pres      | present]{.   |        |
|                                 | ent]{.und | underline}** |        |
|                                 | erline}** |              |        |
+---------------------------------+-----------+--------------+--------+
| ### [1 Obj                      | **[       | **[P]{.      | **[P   |
| ect identification]{.underline} | N/A]{.und | underline}** | or     |
|                                 | erline}** |              | A]{.   |
|                                 |           |              | underl |
|                                 |           |              | ine}** |
+---------------------------------+-----------+--------------+--------+
| **[2 Billing method (Scale or   | **[D or   | **[P]{.      | **[P   |
| Dimensional weight if           | P]{.und   | underline}** | or     |
| used)]{.underline}**            | erline}** |              | A]{.   |
|                                 |           |              | underl |
|                                 |           |              | ine}** |
+---------------------------------+-----------+--------------+--------+
| **[3 Billing rate or rate       | **[D or P | **[P or G or | **[P   |
| chart]{.underline}**            | or        | A]{.         | or     |
|                                 | A]{.und   | underline}** | A]{.   |
|                                 | erline}** |              | underl |
|                                 |           |              | ine}** |
+---------------------------------+-----------+--------------+--------+
| **[4 Dimensional weight (if     | *         | **[P]{.      | **[P   |
| used)]{.underline}**            | *[P]{.und | underline}** | or     |
|                                 | erline}** |              | A]{.   |
|                                 |           |              | underl |
|                                 |           |              | ine}** |
+---------------------------------+-----------+--------------+--------+
| **[5 Conversion factor (if      | **[D or P | **[P]{.      | **[P   |
| dimensional weight is           | or        | underline}** | or     |
| used)]{.underline}**            | A]{.und   |              | G]{.   |
|                                 | erline}** |              | underl |
|                                 |           |              | ine}** |
+---------------------------------+-----------+--------------+--------+
| **[6 Dimensional weight         | **[D or   | **[P]{.      | **[P   |
| statement^1 ^(if dimensional    | P]{.und   | underline}** | or     |
| weight is used)]{.underline}**  | erline}** |              | G]{.   |
|                                 |           |              | underl |
|                                 |           |              | ine}** |
+---------------------------------+-----------+--------------+--------+
| **[7 Total price]{.underline}** | *         | **[P]{.      | **[P   |
|                                 | *[P]{.und | underline}** | or     |
|                                 | erline}** |              | A]{.   |
|                                 |           |              | underl |
|                                 |           |              | ine}** |
+---------------------------------+-----------+--------------+--------+
| **[A = AVAILABLE UPON REQUEST   |           |              |        |
| BY CUSTOMER ^2^,]{.underline}** |           |              |        |
|                                 |           |              |        |
| **[D =                          |           |              |        |
| DISPLAYED,]{.underline}**       |           |              |        |
|                                 |           |              |        |
| **[G = PUBLISHED GUIDELINES OR  |           |              |        |
| CONTRACTS,]{.underline}**       |           |              |        |
|                                 |           |              |        |
| **[M = MARKED,]{.underline}**   |           |              |        |
|                                 |           |              |        |
| **[N/A = NOT                    |           |              |        |
| APPLICABLE,]{.underline}**      |           |              |        |
|                                 |           |              |        |
| ##### P = PRINTED               |           |              |        |
|                                 |           |              |        |
| **[^1^ This is an explanation   |           |              |        |
| that the dimensional weight is  |           |              |        |
| not a true weight but is a      |           |              |        |
| calculated value obtained by    |           |              |        |
| applying a conversion factor to |           |              |        |
| the hexahedron dimensions or    |           |              |        |
| volume of the                   |           |              |        |
| object.]{.underline}**          |           |              |        |
|                                 |           |              |        |
| **[^2^ The information          |           |              |        |
| "available upon request by      |           |              |        |
| customer" shall be retained by  |           |              |        |
| the party having issued the     |           |              |        |
| invoice for at least            |           |              |        |
| 30 calendar days after the date |           |              |        |
| of invoicing.]{.underline}**    |           |              |        |
|                                 |           |              |        |
| **[Hexahedron = An object with  |           |              |        |
| six rectangular, plane surfaces |           |              |        |
| (sides).]{.underline}**         |           |              |        |
+---------------------------------+-----------+--------------+--------+
| **[(Table added                 |           |              |        |
| 2004)]{.underline}**            |           |              |        |
+---------------------------------+-----------+--------------+--------+

**Background/Discussion:** This proposal was developed by the NIST
Weights and Measures Division at the request of the MDMD Working Group
following its meeting in July 2003. The Work Group approved the proposal
and agreed to forward it to the NCWM S&T Committee for consideration.
The current Table S.1.6. contains not only specifications for devices or
systems but also includes user requirements. The manufacturer of a
device or system is responsible for assuring compliance with NIST
Handbook 44 specifications. The owner or operator of a device or system
is responsible for assuring that the device or system is used in a
manner consistent with user requirements of Handbook 44. Separating the
requirements into two separate tables would aid manufacturers, users,
and weights and measures officials in determining responsibility for
complying with a particular requirement. NCWM adoption of this item
would aid in the effort to change the status of the Multiple Dimension
Measuring Devices Code from "tentative" to "permanent."

At their Fall 2003 Meetings, the Western, and Southern Weights and
Measures Associations agreed with the proposal as written. In addition,
the Western Weights and Measures Association commended the MDMD Working
Group for its work on this issue.

At the 2004 NCWM Interim Meeting, the Committee heard support for all
items relating to the MDMD Code. The Committee also heard a suggestion
to move a proposal to change the status of the code from "tentative" to
"permanent" to the end of the 358 items. This change in the order of the
items would insure that the status of the code would be decided after
all other proposed changes to the code had been considered. The
Committee agreed and reordered the items accordingly and proposed the
items for a vote.

At their May 2004, meetings the CWMA & NEWMA supported this item as
presented.

At the 2004 NCWM Annual Meeting, a manufacturer of multiple dimension
measuring devices indicated support for agenda items 358-1 through
358-7, noting that the proposals represented sound technical
requirements developed by the work group with representation from
manufacturers, users, and weights and measures officials.

####### 358-2 VC S.1.8. Indications Below Minimum and Above Maximum and Table S.4.1.b. Notes for Table S.4.1.a.; Note 7

(This item was adopted.)

**Source:** Multiple Dimension Measuring Devices Working (MDMD) Group

**Recommendation:** Modify Handbook 44 Section 5.58. Multiple Dimension
Measuring Devices paragraph S.1.8. and Note 7 of Table S.4.1.b. as
follows:

> **S.1.8. Indications Below Minimum and Above Maximum. -** Except for
> entries of tare, when objects are smaller than the minimum dimensions
> identified in paragraph S.1.7. or larger than **~~105 %~~
> [any]{.underline}** of the maximum dimensions **[plus
> 9 d,]{.underline}** and/or **[maximum]{.underline}** volume marked on
> the device **[plus 9 d]{.underline}, [or when a combination of
> dimensions for the object being measured exceeds the measurement
> capability of the device]{.underline}**, the indicating or recording
> element shall either:
>
> \(a\) not display or record any usable values, or

(b) identify the displayed or recorded representation with an error
    indication.

[(Amended 2004)]{.underline}

+-----------------------------------------------------------------------+
| **Multiple Dimension Measuring Systems Table S.4.1.b. Notes for Table |
| S.4.1.a.**                                                            |
+-----------------------------------------------------------------------+
| **.**                                                                 |
|                                                                       |
| **.**                                                                 |
|                                                                       |
| **.**                                                                 |
|                                                                       |
| 7\. Materials, shapes, structures, **[combination of object           |
| dimensions,]{.underline}** or object orientations that are            |
| inappropriate for the device or those that are appropriate.           |
|                                                                       |
| **.**                                                                 |
|                                                                       |
| **.**                                                                 |
|                                                                       |
| **.**                                                                 |
+-----------------------------------------------------------------------+
| **[(Amended 2004)]{.underline}**                                      |
+-----------------------------------------------------------------------+

**Background/Discussion:** This proposal was developed by the NIST
Weights and Measures Division prior to MDMD Working Group's July
2003 Meeting, to address a request to clarify the requirements in
Paragraph S.1.8 and the marking requirement in Note 7 in Table S.4.1.b.
for limitation of use. Some device designs use a measurement pattern (as
shown in example below) that may not allow the device to measure to both
the marked maximum height limit and the marked maximum width limit on
the same object. The marked maximum height and width are individually
correct with respect to the device capability. The minimum and maximum
dimension requirements in NIST Handbook 44 did not adequately address
this scenario. Handbook 44 stated that if an object exceeded the marked
measuring limitation for any axis by 105 % it must not display or record
a value or it must provide an error message. In the example below, the
shape, structure, or orientation of the largest object (object 3) in the
example below does not exceed the manufacturers marked capacity for
height or width individually; however, the system is not capable of
providing an accurate measurement for this object because this
combination of dimensions is beyond the device's capability. Note 7 in
Table S.4.1.b., did not specifically address this situation.

**Example:**

**Correct Measurement Correct Measurement No Measurement**

At its July 2003 Meeting, the MDMD Working Group agreed that the current
105 % limit on overcapacity indication should be changed to the marked
maximum plus 9 d for each dimension and/or total volume indicated. This
change is consistent with Measurement Canada's requirements and other
Handbook 44 Codes that have an overcapacity limit. The Working Group
also agreed that the other proposed modifications to paragraph S.1.8.
and Note 7 in Table S.4.1.a. are appropriate to recognize new
measurement technologies that have been developed since the Tentative
Code was adopted. The Work Group agreed to forward the proposals shown
above to the S&T Committee for consideration. NCWM adoption of this item
would aid in the effort to change the status of the Multiple Dimension
Measuring Devices Code from "tentative" to "permanent."

At their Fall 2003 Meetings, the Western and Southern Weights and
Measures Associations agreed with the proposal as written. In addition,
the Western commended the MDMD Working Group for its work on this issue.

At the 2004 NCWM Interim Meeting, the Committee heard support for all
items relating to the MDMD Code. The Committee also heard a suggestion
to move a proposal to change the status of the code from "tentative" to
"permanent" to the end of the 358 items. This change the in order of the
items would insure that the status of the code would be decided after
all other proposed changes to the code had been considered. The
Committee agreed and reordered the items accordingly and proposed the
items for a vote.

At their May 2004, meetings the CWMA & NEWMA supported this item
358-2 as presented.

At the 2004 NCWM Annual Meeting, a manufacturer of multiple dimension
measuring devices indicated support for agenda items 358-1 through
358-7, noting that the proposals represented sound technical
requirements developed by the work group with representation from
manufacturers, users, and weights and measures officials.

####### 358-3 VC S.3. Systems with Two or More Measuring Elements and Definition of Measurement Field

(This item was adopted.)

**Source:** Multiple Dimension Measuring Devices Working Group

**Recommendation:** Modify Handbook 44 5.58. Multiple Dimension
Measuring Devices, paragraph S.3. as follows, and add a definition for
the term "Measurement Field."

> **S.3.** **System with Two or More Measuring Elements. -** A multiple
> dimension measuring system with a single indicating or recording
> element, or a combination indicating-recording element, that is
> coupled to two or more measuring elements with independent measuring
> systems, shall be provided with a means to prohibit the activation of
> any measuring element (or elements) not in use, and shall be provided
> with automatic means to indicate clearly and definitely which
> measuring element is in use.
>
> **[Note: This requirement does not apply to individual devices that
> use multiple emitters/sensors within a device in combination to
> measure objects in the same measurement field.]{.underline}**
>
> [**measurement field.** -- **A region of space or the measurement
> pattern produced by the measuring instrument in which objects are
> placed or passed through, either singly or in groups, when being
> measured by a single device. \[5.58.\]**]{.underline}

(Amended 2004)

Example:

**Background/Discussion:** This proposal was developed by the NIST
Weights and Measures Division prior to MDMD Working Group's July
2003 Meeting to clarify the requirements in paragraph S.3. The original
intent of this paragraph was to address more than one measuring element
in separate locations within a single facility that are all coupled to a
single indicator. For example, in a shipping hub there may be multiple
lines each measuring different objects to increase the shipping capacity
of the facility. All the measuring lines may be connected to a single
indicator. At least one manufacturer believes that some interpret the
term "measuring element" as applying to a device with multiple measuring
elements (emitters/sensors) as shown in the example above. A problem
arises with the existing language if a relatively narrow box is placed
on the belt such that only one or two of the measuring elements shown
makes measurements. The manufacturer is concerned that some may
interpret paragraph S.3. to require the device in the example to
identify the measuring element or elements involved in the measurement
of a single object. The recommended changes should clarify the intent
and application of this section. The Working Group supported the
proposal as developed by WMD. NCWM adoption of this proposal would aid
in the effort to change the status of the Multiple Dimension Measuring
Devices Code from "tentative" to "permanent."

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) heard comments from a manufacturer supporting the
proposal. The WWMA recommended alternate language for the proposed note
to paragraph S.3. to clarify the intent of the proposal and editorial
corrections to the language in the definition of "measurement field."

At its October 2003 Meeting, the Southern Weights and Measures
Association (SWMA) supported the proposal as submitted by the MDMD
Working Group. The SWMA was not necessarily opposed to the language
submitted by WWMA, but it did not think the language was significantly
different.

At the 2004 NCWM Interim Meeting, the Committee heard support for all
items relating to the MDMD Code. The Committee also heard a suggestion
to move a proposal to change the status of the code from "tentative" to
"permanent" to the end of the 358 items. This change in the order of the
items would insure that the status of the code would be decided after
all other proposed changes to the code had been considered. Measurement
Canada indicated that the "note" in the original proposal and the WWMA
alternate definition for "measurement field" were the most technically
correct of the alternate language options proposed. Measurement Canada
also recommended that the term "measuring element" in the example
drawing be replaced with the term "emitter/sensor." The Committee agreed
with Measurement Canada's recommendation and amended the proposal as
presented above. The Committee agreed and reordered the items
accordingly and proposed the item for a vote.

At their May 2004, meetings the CWMA & NEWMA supported this item as
presented.

At the 2004 NCWM Annual Meeting, a manufacturer of multiple dimension
measuring devices indicated support for agenda items 358-1 through
358-7, noting that the proposals represented sound technical
requirements developed by the work group with representation from
manufacturers, users, and weights and measures officials.

####### 358-4 VC N.1.4.1. Test Objects and Definition of Test Objects

(This item was adopted.)

**Source:** Multiple Dimension Measuring Devices Working Group

**Recommendation:** Modify Handbook 44 Section 5.58. Multiple Dimension
Measuring Devices, by adding a new paragraph N.1.4.1. Test Objects and a
new definition of the term "test object" as follows:

> **[N.1.4.1  Test Object. - Verification of devices may be conducted
> using appropriate test objects of various sizes and of stable
> dimensions. Test object dimensions must be known to an expanded
> uncertainty (coverage factor k = 2) of not more than one-third of the
> applicable device tolerance. The dimensions shall also be checked to
> the same uncertainty when used at the extreme values of the influence
> factors.]{.underline}**
>
> **[The dimensions of all test objects shall be verified using a
> reference standard that is traceable to NIST (or equivalent national
> laboratory) and meet the tolerances expressed in NIST Handbook
> 44 Fundamental Considerations, paragraph 3.2. (i.e., one-third of the
> smallest tolerance applied to the device).]{.underline}**
>
> **[(Added 2004)]{.underline}**
>
> **[test object. - An object whose dimensions are verified by
> appropriate reference standards and intended to verify compliance of
> the device under test with certain metrological requirements.
> \[5.58\]]{.underline}**
>
> **[(Added 2004)]{.underline}**

**Background/Discussion:** This proposal originated from the July
2003 MDMD Working Group Meeting. Test standards similar to those
developed by Canada for type approval are not currently available in the
United States. Without available standards or standards specifications,
it is difficult to ensure consistent test results from field
inspections. Some state and local inspectors have conducted tests of
multiple dimension measuring devices using packages that were available
at the test site. If field officials choose to use on-site packages,
great care must be taken in the selection of objects that are in a very
stable condition and can be compared to a certified length standard with
an appropriate degree of uncertainty. Cardboard boxes are particularly
subject to damage and deformity. Due to the relative uncertainty of the
measurement process, multiple dimension measuring devices with a
division size of less than 1 cm (0.5 inch) should only be tested with
verified test standards. Uncertainty can be stated as the range of
values within which the true value to the "standard" is estimated to lie
and defines the limits of error about a measured value between which the
true value will lie with the confidence level stated. A coverage factor
of k = 2 provides a confidence level of 95 %. The Multiple Dimension
Measuring Devices Code provides guidance regarding the appropriate size
of test objects, but it does not provide any other criteria for what
constitutes an appropriate test object. The term "test object" is also
not defined in Handbook 44. OIML R 129 Multi-dimensional measuring
instruments, provides a definition for a test object and criteria for
using test objects to verify the performance of multiple dimension
measuring devices. Proposed paragraph N.1.4.1. provides field officials
who do not have specifically designed standards for testing multiple
dimension measuring devices with a mechanism for testing these devices,
provided care is taken in developing proper reference standards. The
approach can be compared to the testing of in-motion-monorail scales
with carcasses. In both cases, care must be taken to verify that the
standards are appropriate at the beginning of a test and remain stable
throughout the entire test of the device. The Working Group agreed to
submit the proposal as written to the NCWM S&T Committee for
consideration at the NCWM Interim Meeting. NCWM adoption of this item
would aid in the effort to change the status of the Multiple Dimension
Measuring Devices Code from "tentative" to "permanent."

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) heard comments from a manufacturer supporting the
proposal. The WWMA S&T Committee was concerned about an apparent
conflict between the language in the first proposed paragraph, which
states that the expanded uncertainty of the test object must be known to
one‑fifth of the applicable device tolerance in field testing and to
language in the second paragraph, which states that the test object be
verified using standards with an uncertainty less than one-third of the
smallest tolerance applied to the device. The WWMA recommended removing
the expanded uncertainty language in the first paragraph of the original
proposal since the language may be more appropriate for standards used
for type evaluation tests.

At is October 2003 Meeting, the Southern Weights and Measures
Association (SWMA) reviewed and supported the change to
N.1.4.1 submitted by the WWMA.

After further review of the MDMD Working Group's proposal presented at
the 2004 NCWM Interim Meeting, Measurement Canada submitted alternate
language to simplify paragraph N.1.4.1. as shown above.

At the 2004 NCWM Interim Meeting, the Committee heard support for all
items relating to the MDMD Code. The Committee also heard a suggestion
to move a proposal to change the status of the code from "tentative" to
"permanent" to the end of the 358 items. This change in the order of the
items would insure that the status of the code would be decided after
all other proposed changes to the code had been considered. The
Committee agreed and reordered the items accordingly and proposed the
items for a vote.

At their May 2004, meetings the CWMA & NEWMA supported this item as
presented.

At the 2004 NCWM Annual Meeting, a manufacturer of multiple dimension
measuring devices indicated support for agenda items 358-1 through
358-7, noting that the proposals represented sound technical
requirements developed by the work group with representation from
manufacturers, users, and weights and measures officials.

####### 358-5 VC T.3. Tolerance Values 

(This item was adopted.)

**Source:** Multiple Dimension Measuring Devices (MDMD) Working Group

**Recommendation:** Modify Handbook 44 Section 5.58. Multiple Dimension
Measuring Devices, paragraph T.3. Tolerance Values as follows:

> **T.3. Tolerance Values. -** The maintenance and acceptance tolerance
> values shall be ±1 division. **~~These tolerances apply regardless of
> the shape or material of the object being measured unless otherwise
> marked on the device.~~**
>
> **[(Amended 2004)]{.underline}**

**Background/Discussion:** This proposal originated from the July
2003 MDMD Working Group Meeting. One member of the group indicated that
his company believes that paragraph T.3. should be clarified and that
the entire second sentence in the paragraph is unnecessary and could be
misleading. The present wording of this section seems to imply that
multiple tolerances are permitted on a system if they are marked on the
device. Tolerances applicable to devices performing similar or
duplicative functions should be equivalent. The work group agreed to
submit the proposal as written to the NCWM S&T Committee for
consideration at the NCWM Interim Meeting. NCWM adoption of this item
would aid in the effort to change the status of the Multiple Dimension
Measuring Devices Code from "tentative" to "permanent."

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) heard comments from a manufacturer supporting the
proposal. The WWMA supported the proposal as submitted and recommended
that the NCWM S&T Committee move the proposal forward as a voting item.

At its October 2003 Meeting, the Southern Weights and Measures
Association (SWMA) supported the proposal as written.

At the 2004 NCWM Interim Meeting, the Committee heard support for all
items relating to the MDMD Code. The Committee also heard a suggestion
to move a proposal to change the status of the code from "tentative" to
"permanent" to the end of the 358 items. This change in the order of the
items would insure that the status of the code would be decided after
all other proposed changes to the code had been considered. The
Committee agreed and reordered the items accordingly and proposed the
items for a vote.

At their May 2004, meetings the CWMA & NEWMA supported this item as
presented.

At the 2004 NCWM Annual Meeting, a manufacturer of multiple dimension
measuring devices indicated support for agenda items 358-1 through
358-7, noting that the proposals represented sound technical
requirements developed by the work group with representation from
manufacturers, users, and weights and measures officials.

####### 358-6  VC T.5.2. Power Supply Voltage, T.5.2.1. Alternating Current Power Supply, and T.5.2.2. Direct Current Power Supply

(This item was adopted.)

**Source:** Multiple Dimension Measuring Devices (MDMD)Working Group

**Recommendation:** Modify Handbook 44 Section 5.58. Multiple Dimension
Measuring Devices, paragraph T.5.2. Power Supply Voltage, add new
paragraphs T.5.2.1. Alternating Current Power Supply and T.5.2.2. Direct
Current Power Supply, as follows and remove paragraph T.7. Electric
Power Supply.

> **T.5.2. Power Supply Voltage. - ~~Devices shall satisfy the
> applicable tolerances when subjected to power supply voltage variation
> of -15 % to +10 % of the voltage rating specified by the
> manufacturer.~~**
>
> **[T.5.2.1. Alternating Current Power Supply. - Devices that operate
> using alternating current must perform within the conditions defined
> in paragraphs T.3. through T.6., inclusive, from --15 %  to +10 %  of
> the marked nominal line voltage(s) at 60 Hz, or the voltage range
> marked by the manufacturer, at 60 Hz.]{.underline}**
>
> **[(Added 2004)]{.underline}**
>
> **[T.5.2.2. Direct Current Power Supply. - Devices that operate using
> direct current shall operate and perform within the applicable
> tolerance at any voltage level at which the device is capable of
> displaying metrological registrations.]{.underline}**
>
> **[(Added 2004)]{.underline}**
>
> **[(Amended 2004)]{.underline}**
>
> **~~T.7. Electric Power Supply. ‑ Battery‑operated instruments shall
> not indicate nor record values outside the applicable tolerance limits
> when battery power output is excessive or deficient.~~**
>
> **~~(Added 1999)~~**

**Background/Discussion:** This proposal originated from the July
2003 MDMD Working Group Meeting. The requirements currently in
paragraphs T.5.2. and T.7. do not clearly distinguish between
alternating current and direct current power supplies. The language was
also not consistent with similar requirements in other Handbook
44 Codes, such as paragraph T.N.8.3. Electric Power Supply in the Scales
Code or paragraph T.N.7.3. Electric Power Supply in the Automatic
Weighing Systems Code. All codes should be consistent and, where
possible, should harmonize with international requirements. The Work
Group agreed to submit the proposal as written to the NCWM S&T Committee
for consideration at the NCWM Interim Meeting. NCWM adoption of this
item would aid in the effort to change the status of the Multiple
Dimension Measuring Devices Code from "tentative" to "permanent."

At its September 2003 Meeting, the Western Weights and Measures
Association (WWMA) heard comments from a manufacturer supporting the
proposal. The WWMA supported the proposal as submitted and recommended
that the NCWM S&T Committee move the proposal forward as a voting item.

At its October 2003 Meeting, the Southern Weights and Measures
Association (SWMA) supported the proposal as written.

At the 2004 NCWM Interim Meeting, the Committee heard support for all
items relating to the MDMD Code. The Committee also heard a suggestion
to move a proposal to change the status of the code from "tentative" to
"permanent" to the end of the 358 items. This change in the order of the
items would insure that the status of the code would be decided after
all other proposed changes to the code had been considered. The
Committee agreed and reordered the items accordingly and proposed the
items for a vote.

At their May 2004, meetings the CWMA & NEWMA supported this item as
presented.

At the 2004 NCWM Annual Meeting, a manufacturer of multiple dimension
measuring devices indicated support for agenda items 358-1 through
358-7, noting that the proposals represented sound technical
requirements developed by the work group with representation from
manufacturers, users, and weights and measures officials.

####### 358-7 VC Tentative Status of the Multiple Dimension Measuring Devices Code

(This item was adopted.)

**Source:** Carryover Item 358-1. (This item originated from the
Southern Weights and Measures Association (SWMA) and first appeared on
the Committee's 2002 agenda.)

**Recommendation:** Change the status of the Multiple Dimension
Measuring Devices Code (MDMD) from tentative to permanent.

**Discussion:** In response to comments from weights and measures
officials and industry representatives, the Multiple Dimension Measuring
Devices Code was considered in 2002 for permanent status. The Committee
heard that the code should be harmonized with the more stringent
Canadian requirements. Industry representatives cautioned that other
issues may exist because the code was developed prior to some of the
latest electronic technology. Therefore, in July 2002 the proposal was
changed from a voting item to an information item pending further
review.

During the 2003 NCWM Interim Meeting, the Committee heard that Canada is
considering a number of proposals to modify Canadian requirements for
Multiple Dimension Measuring Devices (MDMD) devices. Consequently, in
the interest of aligning U.S. and Canadian requirements, the Committee
agreed that the proposal should remain an information item to allow time
for review and comparison of U.S. and pending Canadian requirements.

The MDMD Working Group met July 17-18, 2003, to discuss outstanding
issues in the MDMD Code. The Work Group submitted proposals
(358-1 through 358-6 in this report) for changes to NIST Handbook 44 to
the NCWM S&T Committee for consideration at the January 2004 NCWM
Interim Meeting.

At the 2004 NCWM Interim Meeting, the Committee heard support for all
items relating to the MDMD Code. The Committee also heard a suggestion
to move a proposal to change the status of the code from "tentative" to
"permanent" to the end of the 358 items. This change in the order of the
items would insure that the status of the code would be decided after
all other proposed changes to the code had been considered. The
Committee agreed and reordered the items accordingly and proposed the
items for a vote.

At their May 2004, meetings the CWMA & NEWMA supported this item as
presented.

At the 2004 NCWM Annual Meeting, a manufacturer of multiple dimension
measuring devices indicated support for agenda items 358-1 through
358-7, noting that the proposals represented sound technical
requirements developed by the work group with representation from
manufacturers, users, and weights and measures officials.

For background information, refer to the 2002 and 2003 S&T Final Report.

###### 360 OTHER ITEMS

####### 360-1 W Revise NIST Handbook 44

(This item was withdrawn.)

**Source:** Carryover Item 360-1 (This item originated from the Southern
Weights and Measures Association (SWMA) and first appeared on the
Committee's 1999 agenda.)

**Discussion:** Work on revising NIST Handbook 44 has not resumed since
2000 when there were unanticipated changes to key members on the
Handbook 44 Working Group. The Committee continues in its support of the
BOD's efforts to eventually revise Handbook 44 to create a more
user-friendly document.

The Western Weights and Measures Association recommended that this item
remain informational and encouraged the NCWM Board of Directors (BOD) to
support the revision project.

The Committee acknowledged that there is a need to create a more
user-friendly document for the field official. An inspector's field
manual that provides the "basic" information necessary to perform both
an initial and subsequent field tests was one suggested publication.
However, there has not been any work to revise Handbook 44 for almost
five years. Consequently, the Committee withdrew this item from its
agenda with plans to revisit the issue whenever the BOD is able to
resume its work plan and can provide resources for the project.

####### 360-2 I International Organization of Legal Metrology (OIML) Report 

The complete OIML Report is included as part Appendix B of the NCWM OIML
Board of Director's 2004 Final Report.

Many issues before the OIML, the Asian-Pacific Legal Metrology Forum
(APLMF), and other international groups are within the purview of the
S&T Committee. Additional information on OIML activities is available on
the OIML web site at http://www.oiml.org/.

For more information on specific device activities see the Weights and
Measures Division staff listed in the table below:

+----------+---------+------------------+-----------------+-----------+
| ##       |         |                  |                 |           |
|  NIST We |         |                  |                 |           |
| ights an |         |                  |                 |           |
| d Measur |         |                  |                 |           |
| es Divis |         |                  |                 |           |
| ion Cont |         |                  |                 |           |
| act List |         |                  |                 |           |
+==========+=========+==================+=================+===========+
| *        | **Tele  | **Email**        | **Device Type** | **Postal  |
| *Staff** | phone** |                  |                 | Mail**    |
|          |         |                  |                 |           |
|          |         |                  |                 | **or      |
|          |         |                  |                 | Fax**     |
+----------+---------+------------------+-----------------+-----------+
| Steven   | 301-9   | <steve           | Weighing        | NIST WMD  |
| Cook     | 75-4003 | n.cook@nist.gov> | Devices         |           |
| (LMDG)   |         |                  |                 | 1         |
|          |         |                  |                 | 00 Bureau |
|          |         |                  |                 | Dr        |
|          |         |                  |                 |           |
|          |         |                  |                 | MS 2600   |
|          |         |                  |                 |           |
|          |         |                  |                 | Gait      |
|          |         |                  |                 | hersburg, |
|          |         |                  |                 | MD        |
|          |         |                  |                 |           |
|          |         |                  |                 | 2         |
|          |         |                  |                 | 0899-2600 |
|          |         |                  |                 |           |
|          |         |                  |                 | Fax:      |
|          |         |                  |                 |           |
|          |         |                  |                 | 301       |
|          |         |                  |                 | -926-0647 |
+----------+---------+------------------+-----------------+-----------+
| Richard  | 301-9   | richard.h        | R 134 -         |           |
| Harshman | 75-8107 | arshman@nist.gov | Weighing Road   |           |
| (LMDG)   |         |                  | Vehicles        |           |
|          |         |                  | In-Motion       |           |
|          |         |                  |                 |           |
|          |         |                  | R 60 - Load     |           |
|          |         |                  | Cells           |           |
+----------+---------+------------------+-----------------+-----------+
| Diane    | 301-9   | <dia             | R 59 Moisture   |           |
| Lee      | 75-4405 | ne.lee@nist.gov> | Meters for      |           |
| (LMDG)   |         |                  | Cereal Grains   |           |
|          |         |                  | and Oilseeds    |           |
+----------+---------+------------------+-----------------+-----------+
| Ralph    | 301-9   | <ralph.r         | R 117 -         |           |
| Richter  | 75-4025 | ichter@nist.gov> | Measuring       |           |
| (ILMG)   |         |                  | Systems for     |           |
|          |         |                  | Liquids Other   |           |
|          |         |                  | Than Water      |           |
|          |         |                  |                 |           |
|          |         |                  | R 105 - Direct  |           |
|          |         |                  | Mass Flow       |           |
|          |         |                  |                 |           |
|          |         |                  | Measuring       |           |
|          |         |                  | Systems for     |           |
|          |         |                  | Quantities of   |           |
|          |         |                  | Liquids, and    |           |
|          |         |                  | Gas Meters      |           |
+----------+---------+------------------+-----------------+-----------+
| Wayne    | 301-9   | <s.s             | Measuring       |           |
| Stiefel  | 75-4011 | tiefel@nist.gov> | Devices         |           |
| (ILMG)   |         |                  |                 |           |
+----------+---------+------------------+-----------------+-----------+
| Ambler   | 301-9   | <                | Electronic      |           |
| Thompson | 75-2333 | ambler@nist.gov> | Measuring       |           |
| (ILMG)   |         |                  | Devices         |           |
+----------+---------+------------------+-----------------+-----------+
| Juana    | 301-9   | <juana.wi        | R 21 Taximeters |           |
| Williams | 75-3989 | lliams@nist.gov> |                 |           |
| (LMDG)   |         |                  |                 |           |
+----------+---------+------------------+-----------------+-----------+
| LMDG -   |         |                  |                 |           |
| Legal    |         |                  |                 |           |
| M        |         |                  |                 |           |
| etrology |         |                  |                 |           |
| Devices  |         |                  |                 |           |
| Group    |         |                  |                 |           |
|          |         |                  |                 |           |
| ILMG -   |         |                  |                 |           |
| Inter    |         |                  |                 |           |
| national |         |                  |                 |           |
| Legal    |         |                  |                 |           |
| M        |         |                  |                 |           |
| etrology |         |                  |                 |           |
| Group    |         |                  |                 |           |
+----------+---------+------------------+-----------------+-----------+

The Committee encourages the BOD to implement a plan to address
U.S./OIML harmonization.

####### 360-3  D Developing Issues

The NCWM established a mechanism to disseminate information about
emerging issues which have merit and are of national interest.
Developing issues have not received sufficient review by all parties
affected by the proposal or may be insufficiently developed to warrant
review by the NCWM S&T Committee. The developing issues listed below are
currently under review by at least one regional association or technical
committee.

The developing issues are listed in Appendix A according to the specific
NIST Handbook 44 Code Section under which they fall.

The S&T Committee encourages interested parties to examine the proposals
included in Appendix A and send their comments to the contact listed in
each item.

The Committee asks that the regional weights and measures associations
and National Type Evaluation Technical Committee Sectors continue their
work to fully develop each proposal. Should an association or Sector
decide to discontinue work on a developmental item, the Committee asks
that it be notified.

####### 360-4 I Add International Terms that are Synonyms to NIST Handbook 44 Terms to Appendix D; Definitions 

**Source:** Northeastern Weights and Measures Association (NEWMA)

**Discussion:** Many Handbook 44 and OIML technical concepts and
procedures are in harmony, yet, there are significant differences in the
terminology used. The harmonization of language is not necessary to
harmonize requirements provided a state of equivalence exists; however,
improvements should be promoted where the language is confusing or has
the potential for misinterpretation. Currently, the U.S. National
Working Group (USNWG) on R 76 Non-Automatic Weighing Instruments is
working on a proposal to amend NIST Handbook 44 Appendix D, Definitions
to include international terminology that is synonymous with Handbook
44 definitions. The USNWG will identify Handbook 44 terms or definitions
that are equivalent to international vocabulary in a format that is
similar to the example shown below:

> **automatic zero-setting mechanism [(OIML R 76: zero-tracking
> device)]{.underline}.** Automatic means provided to maintain zero . .
> . operation. \[2.20\]

The work to amend Appendix D will also clarify terminology for
international participants in the proposed Mutual Acceptance Arrangement
(MAA)(see BOD Agenda, Appendix A for more information), where it is
imperative that all affected parties are aware and understand each
other's requirements. For example, the Handbook 44 term "automatic zero
setting" has an entirely different meaning in R 76. Handbook 44 is also
inconsistent in the use of many terms such as "division," "increment,"
and "interval." The addition of international terminology to existing
Handbook 44 language may also help to eliminate any confusion about the
use of other frequently used terms such as: device, element, mechanism,
scale, weigher, and balance.

A subcommittee made up of USNWG members has volunteered to review and
suggest recommendations on Handbook 44 General Code and Scales Code
definitions where there is equivalent international terminology. The
group plans to ballot the USNWG and submit a completed proposal to the
NCWM S&T Committee. This item is intended to familiarize the public and
private sectors with the proposed approach to modify Appendix D.

NEWMA supports this item and views it as a first step toward educating
weights and measures officials. Future steps should include making
proposed changes to incorporate international terms in the text of
Handbook 44 with the ultimate goal of having one mutually acceptable set
of terms.[^1] The Committee concurred with NEWMA's assessment that the
proposal is a necessary step to harmonize U.S. and international
terminology to ultimately harmonize U.S. and International Standards.
The Committee decided to make this an information item to allow the work
group sufficient time to complete its work.

# Appendix A

[]{#appendixa .anchor}

**Item 360-3: Developing Issues**

**D Part 1, General Code;G-S.5.6.1. Recorded Representation of Metric
Units on Equipment with Limited Character Sets**

**Source:** Western Weights and Measures Association (WWMA)

**Recommendation:** Modify paragraph G-S.5.6.1. as follows:

> **G-S.5.6.1. ~~Recorded Representation of Metric Units on Equipment
> with Limited Character Sets~~ [Acceptable Abbreviations for Recorded
> and Indicated Representation of Units on Equipment]{.underline}. -**
> The appropriate defining symbols are shown in Table 1.

Add the following new abbreviations to existing Table 1 Representation
of Units in the General Code:

  --------------------------------- ----------------------- ---------------------------------- ----------------------- ----------------------- ------------------------------ ------------------------- ---------------------------------- ------------------------- -------------------------
  **[Name of Unit]{.underline}**    **[Common Use           **[Representation]{.underline}**                                                   **[Name of Unit]{.underline}** **[Common Use             **[Representation]{.underline}**                             
                                    Symbol]{.underline}**                                                                                                                     Symbol]{.underline}**                                                                  

                                                            **[Form I]{.underline}**           **[Form                                                                                                  **[Form I]{.underline}**           **[Form II]{.underline}** 
                                                                                               II]{.underline}**                                                                                                                                                     

                                                            **[(double case)]{.underline}**    **[(single lower        **[(single case                                                                  **[(double case)]{.underline}**    **[(single lower          **[(single case
                                                                                               case)]{.underline}**    upper)]{.underline}**                                                                                               case)]{.underline}**      upper)]{.underline}**

  **[inch]{.underline}**            **[in]{.underline}**    **[in]{.underline}**               **[in]{.underline}**    **[IN]{.underline}**    **[deciliter]{.underline}**    **[dL]{.underline}**      **[dL]{.underline}**                                         

  **[foot]{.underline}**            **[ft]{.underline}**    **[ft]{.underline}**               **[ft]{.underline}**    **[FT]{.underline}**    **[kiloliter]{.underline}**    **[kL]{.underline}**      **[kL]{.underline}**                                         

  **[yard]{.underline}**            **[yd]{.underline}**    **[yd]{.underline}**               **[yd]{.underline}**    **[YD]{.underline}**    **[cubic meter]{.underline}**  **[M^3^]{.underline}**    **[m^3^]{.underline}**             **[m^3^]{.underline}**    **[M^3^]{.underline}**

  **[milligram]{.underline}**       **[mg]{.underline}**    **[mg]{.underline}**               **[mg]{.underline}**                            **[cubic inch]{.underline}**   **[in^3^]{.underline}**   **[in^3^]{.underline}**            **[in^3^]{.underline}**   **[IN^3^]{.underline}**

  **[megagram]{.underline}**        **[Mg]{.underline}**    **[Mg]{.underline}**                                                               **[cubic foot]{.underline}**   **[ft^3^]{.underline}**   **[ft^3^]{.underline}**            **[ft^3^]{.underline}**   **[FT^3^]{.underline}**

  **[grain]{.underline}**           **[gr]{.underline}**    **[gr]{.underline}**               **[gr]{.underline}**                            **[cubic yard]{.underline}**   **[yd^3^]{.underline}**   **[yd^3^]{.underline}**            **[yd^3^]{.underline}**   **[YD^3^]{.underline}**

  **[dram]{.underline}**            **[dr]{.underline}**    **[dr]{.underline}**               **[dr]{.underline}**                            **[gills]{.underline}**        **[gi]{.underline}**      **[gi]{.underline}**               **[Gi]{.underline}**      **[GI]{.underline}**

  **[ounce]{.underline}**           **[oz]{.underline}**    **[oz]{.underline}**               **[oz]{.underline}**    **[OZ]{.underline}**    **[pint]{.underline}**         **[pt]{.underline}**      **[pt]{.underline}**               **[pt]{.underline}**      **[PT]{.underline}**

  **[pound]{.underline}**           **[lb]{.underline}**    **[lb]{.underline}**               **[lb]{.underline}**    **[LB]{.underline}**    **[quart]{.underline}**        **[qt]{.underline}**      **[qt]{.underline}**               **[qt]{.underline}**      **[QT]{.underline}**

  **[hundredweight]{.underline}**   **[cwt]{.underline}**   **[cwt]{.underline}**              **[cwt]{.underline}**   **[CWT]{.underline}**   **[gallon]{.underline}**       **[gal]{.underline}**     **[gal]{.underline}**              **[gal]{.underline}**     **[GAL]{.underline}**

  **[pennyweight]{.underline}**     **[dwt]{.underline}**   **[dwt]{.underline}**              **[dwt]{.underline}**   **[DWT]{.underline}**   **[ampere]{.underline}**       **[A, I]{.underline}**    **[A, I]{.underline}**                                       **[A, I]{.underline}**

  **[ounce troy]{.underline}**      **[oz t]{.underline}**  **[oz t]{.underline}**             **[oz t]{.underline}**  **[OZ T]{.underline}**  **[resistance]{.underline}**   **[ohm]{.underline}**     **[ohm]{.underline}**              **[ohm]{.underline}**     **[OHM]{.underline}**

  **[milliliter]{.underline}**      **[mL]{.underline}**    **[mL]{.underline}**                                                                                                                                                                                     

  **[centiliter]{.underline}**      **[cL]{.underline}**    **[cL]{.underline}**                                                                                                                                                                                     
  --------------------------------- ----------------------- ---------------------------------- ----------------------- ----------------------- ------------------------------ ------------------------- ---------------------------------- ------------------------- -------------------------

**Discussion:** The WWMA notes that the current Table 1 does not include
many units that are in common use today.

To provide input on this proposal contact Gary Castro, California
Division of Measurement Standards by telephone at 916-229-3018, by fax
at 916-229-3015, or by e-mail at <gcastro@cdfa.ca.gov>.

**D Part 2, Scales; Table 4. Minimum Test Weights and Test Loads; Device
Capacity 500 000 lb**

**Source:** Northeastern Weights and Measures Association (NEWMA)

**Recommendation:** Modify Table 4. Minimum Test Weights and Test Loads
as follows:

+---------------+--------------------+-------+------------------------+
| **Table 4.**  |                    |       |                        |
|               |                    |       |                        |
| **Minimum     |                    |       |                        |
| Test Weights  |                    |       |                        |
| and Test      |                    |       |                        |
| Loads^1^**    |                    |       |                        |
+---------------+--------------------+-------+------------------------+
| **Device      | **Minimums (in     |       | **(where               |
| capacity**    | terms of device    |       | practicable)**         |
|               | capacity)**        |       |                        |
+---------------+--------------------+-------+------------------------+
|               | **Test weights     | *     |                        |
|               | (greater of)**     | *Test |                        |
|               |                    | loads |                        |
|               |                    | ^2^** |                        |
+---------------+--------------------+-------+------------------------+
| 0 to 150 kg   | 100 %              |       |                        |
|               |                    |       |                        |
| (0 to 300 lb) |                    |       |                        |
+---------------+--------------------+-------+------------------------+
| 151 to        | 25 % or 150 kg     | 75 %  | Test weights to dial   |
| 1 500 kg      | (300 lb)           |       | face ca­paci­ty,         |
|               |                    |       | 1 000 d, or test load  |
| (301 to       |                    |       | to used ca­pacity, if   |
| 3 000 lb)     |                    |       | great­er than mini­mums  |
|               |                    |       | speci­fied              |
|               |                    |       |                        |
|               |                    |       | During initial         |
|               |                    |       | verification, a scale  |
|               |                    |       | should be tested to    |
|               |                    |       | capacity.              |
+---------------+--------------------+-------+------------------------+
| 1 501 to      | 12.5 % or 500 kg   | 50 %  |                        |
| 20 000 kg     | (1 000 lb)         |       |                        |
|               |                    |       |                        |
| (3 001 to     |                    |       |                        |
| 40 000 lb)    |                    |       |                        |
+---------------+--------------------+-------+------------------------+
| 2             | 12.5 % or 5 000 kg | 25    |                        |
| 0 001 kg~~+~~ | (10 000 lb)        |  %^3^ |                        |
| **[to         |                    |       |                        |
| 250 000 kg]{  |                    |       |                        |
| .underline}** |                    |       |                        |
| (4            |                    |       |                        |
| 0 001 lb~~+~~ |                    |       |                        |
| **[to 500     |                    |       |                        |
| 000 lb]{.     |                    |       |                        |
| underline}**) |                    |       |                        |
+---------------+--------------------+-------+------------------------+
| ^1 ^If the    |                    |       |                        |
| amount of     |                    |       |                        |
| test weight   |                    |       |                        |
| in Table      |                    |       |                        |
| 4 combined    |                    |       |                        |
| with the load |                    |       |                        |
| on the scale  |                    |       |                        |
| would result  |                    |       |                        |
| in an unsafe  |                    |       |                        |
| condition,    |                    |       |                        |
| then the      |                    |       |                        |
| appropriate   |                    |       |                        |
| load will be  |                    |       |                        |
| determined by |                    |       |                        |
| the official  |                    |       |                        |
| with          |                    |       |                        |
| statutory     |                    |       |                        |
| authority.    |                    |       |                        |
|               |                    |       |                        |
| ^2^The term   |                    |       |                        |
| \"test load\" |                    |       |                        |
| means the sum |                    |       |                        |
| of the        |                    |       |                        |
| combination   |                    |       |                        |
| of field      |                    |       |                        |
| standard test |                    |       |                        |
| weights and   |                    |       |                        |
| any other     |                    |       |                        |
| applied load  |                    |       |                        |
| used in the   |                    |       |                        |
| conduct of a  |                    |       |                        |
| test using    |                    |       |                        |
| substitution  |                    |       |                        |
| test methods. |                    |       |                        |
| Not more than |                    |       |                        |
| three         |                    |       |                        |
| substitutions |                    |       |                        |
| shall be used |                    |       |                        |
| during        |                    |       |                        |
| substitution  |                    |       |                        |
| testing,      |                    |       |                        |
| after which   |                    |       |                        |
| the           |                    |       |                        |
| tolerances    |                    |       |                        |
| for strain    |                    |       |                        |
| load tests    |                    |       |                        |
| shall be      |                    |       |                        |
| applied to    |                    |       |                        |
| each set of   |                    |       |                        |
| test loads.   |                    |       |                        |
|               |                    |       |                        |
| ^3 ^The scale |                    |       |                        |
| shall be      |                    |       |                        |
| tested from   |                    |       |                        |
| zero to at    |                    |       |                        |
| least 12.5 %  |                    |       |                        |
| of scale      |                    |       |                        |
| capacity      |                    |       |                        |
| using known   |                    |       |                        |
| test weights, |                    |       |                        |
| and then to   |                    |       |                        |
| at least 25 % |                    |       |                        |
| of scale      |                    |       |                        |
| capacity      |                    |       |                        |
| using either  |                    |       |                        |
| a             |                    |       |                        |
| substitution  |                    |       |                        |
| or strain     |                    |       |                        |
| load test     |                    |       |                        |
| that utilizes |                    |       |                        |
| known test    |                    |       |                        |
| weights of at |                    |       |                        |
| least 12.5 %  |                    |       |                        |
| of scale      |                    |       |                        |
| capacity.     |                    |       |                        |
| Whenever      |                    |       |                        |
| practical, a  |                    |       |                        |
| strain load   |                    |       |                        |
| test should   |                    |       |                        |
| be conducted  |                    |       |                        |
| to the used   |                    |       |                        |
| capacity of   |                    |       |                        |
| the scale.    |                    |       |                        |
| When a strain |                    |       |                        |
| load test is  |                    |       |                        |
| conducted,    |                    |       |                        |
| the           |                    |       |                        |
| tolerances    |                    |       |                        |
| apply only to |                    |       |                        |
| the test      |                    |       |                        |
| weights or    |                    |       |                        |
| substitution  |                    |       |                        |
| test loads.   |                    |       |                        |
|               |                    |       |                        |
| (Amended      |                    |       |                        |
| 1988, 1989,   |                    |       |                        |
| 1994, and     |                    |       |                        |
| 2003)         |                    |       |                        |
+---------------+--------------------+-------+------------------------+

**Discussion:** The Committee acknowledged that the NEWMA proposal to
modify Table 4, Minimum Test Weights and Test Loads begins to address
the minimum test load required for all large capacity scales. However,
the proposal erroneously appeared in 2004 S&T Interim Agenda Item
320-2 when it is a separate issue that has merit, but is insufficiently
developed for Committee action. Consequently, NEWMA's proposal now
appears as a developing item in Appendix A Part 2, Scales Code as shown
in the recommendation above.

NEWMA submitted the proposal because jurisdictions encounter scales with
1 000 000 lb nominal capacity and must determine the minimum test load.
NEWMA finds that NIST Handbook 44 is flexible, but does not provide any
definitive guidelines on test loads for large capacity scales. NEWMA
recognized the problems jurisdictions face when testing scales with very
large capacities; therefore, it submitted a proposal to modify Table 4.
NEWMA modified its proposal by reducing the maximum scale capacity from
1 000 000 lb to 500 000 lb. NEWMA also removed from the proposal a new
footnote that permitted the official with statutory authority to
determine the minimum test load for scales that exceeded 500 000 lb
nominal capacity. NEWMA believes the proposal is very relevant, but is
not ready for adoption, until it receives thorough discussion at the
regional level.

The Scale Manufacturers Association reviewed the proposal, but did not
take a position on the modifications to Table 4.

The Committee agreed that Table 4 is the appropriate place in Handbook
44 to provide some guidance on the appropriate minimum test load for
subsequent tests on scales that exceed capacities of 400 000 lb. The
Committee believes that the issue warrants a high priority, but requires
further review and input from both the public and private sectors.

To provide input on this proposal contact Michael Sikula, New York
Bureau of Weights and Measures, by telephone at 518-457-3452, by fax at
518-457-2552, or by e-mail at <mike.sikula@agmkt.state.ny.us>.

# Appendix B

[]{#appendixb .anchor}

# Item 324-1: Tentative Status of the Automatic Weighing Systems Code

**Section 2.24. Automatic Weighing Systems** **~~- Tentative Code~~**

**~~This tentative code has only a trial or experimental status and is
not intended to be enforced by weights and measures officials. The
requirements are designed for study prior to the development and
adoption of a final Code for Automatic Weighing Systems. The tentative
code is intended to be used by the National Type Evaluation Program for
type evaluation of automatic weighing systems. If upgraded to become a
permanent code, all requirements, except those for tolerances, will be
nonretroactive as of the effective date of the permanent code; tolerance
requirements will apply retroactively as of the effective date of the
permanent code.~~**

**~~(Tentative Code Added 1995) (Amended 1998)~~**

The status of Section 2.24. Automatic Weighing Systems was changed from
tentative to permanent in July 2004 and will go into effect on January
1, 2005.

NTEP has been evaluating devices under the provisions of this code since
it was added to Handbook 44 in 1995. In addition, a number of weights
and measures jurisdictions as well as organizations such as USDA have
implemented this code using the provisions of General Code Paragraph
G-A.3. - Special and Unclassified Equipment. It is recommended that the
jurisdictions who have not implemented this code, work with industry to
expedite implementation of its use.

## A. Application

**A.1. -** This code applies to devices used to
**[automatically]{.underline}** weigh **[pre-assembled discrete loads or
single loads of loose materials in applications where automatic weighing
systems]{.underline}**[^2] **[are used or employed in the determination
of quantities, things, produce, or articles for distribution, purchase,
offered or submitted for sale, or in computing any basic charge or
payment for services rendered on the basis of weight, and in packaging
plants subject to regulation by the United States Department of
Agriculture (USDA).]{.underline} ~~or fill packages while the object is
in motion~~** Some weigh-labelers **[and check-weighers]{.underline}**
may also include a scale that is incorporated in a conveyor system that
weighs packages in a static [**or non‑automatic**]{.underline} weighing
mode[^3].

This includes:

(a) **[Automatic]{.underline} ~~W~~[w]{.underline}**eigh-labelers**~~,
    static and dynamic~~**

(b) **[Combination automatic and non-automatic
    weigh-lablers]{.underline}**

(c) Automatic checkweighers

> **~~(Amended 1997)~~**

(d) **[Combination automatic and non-automatic
    checkweighers]{.underline}**

(e) **[Automatic gravimetric filling machines that weigh discrete loads
    or single loads of loose materials and determine package and
    production lot compliance with net weight
    representations]{.underline}** [.]{.underline}

(Amended 1997 [**and 2004**)]{.underline}

**A.2. -** This code does not apply to:

(a) Belt-Conveyor Scale Systems

(b) Railway Track Scales

(c) Monorail Scales

(d) Automatic Bulk-Weighing Systems

(e) Devices that measure quantity on a time basis

(f) Controllers or other auxiliary devices except as they may affect the
    weighing performance

(g) **[Automatic gravimetric filling machines and other automatic
    weighing systems employed in determining the weight of a commodity
    in a plant or business with a quantity control program (e.g., a
    system of statistical process control) using suitable weighing
    instruments and measurement standards traceable to national
    standards to determine production lot compliance with net weight
    representations]{.underline}**[^4]**[.]{.underline}**

> **[(Added 2004)]{.underline}**

**A.3. -** Also see General Code requirements.

**~~A.4. Type Evaluation. - The National Type Evaluation Program will
accept for type evaluation only those devices that comply with all
requirements of this code.~~**

**~~(Added 1998)~~**

**S. Specifications**

**S.1. Design of Indicating and Recording Elements and of Recorded
Representations.**

> **S.1.1. Zero Indication.**
>
> \(a\) A weigh-labeler shall be equipped with an indicating or
> recording element. **~~It~~ [Additionally, a weigh-labeler equipped
> with an indicating or recording element]{.underline}** shall either
> indicate or record a zero-balance condition and an out-of-balance
> condition on both sides of zero.
>
> **[(Amended 2004)]{.underline}**
>
> \(b\) An automatic checkweigher may be equipped with an indicating or
> recording element.
>
> \(c\) A zero-balance condition may be indicated by other than a
> continuous digital zero indication, provided that effective automatic
> means is provided to inhibit a weighing operation or to return to a
> continuous digital indication when the device is in an out-of-balance
> condition.
>
> **S.1.1.1. Digital Indicating Elements.**
>
> \(a\) A digital zero indication shall represent a balance condition
> that is within ± ½ scale division.
>
> \(b\) A digital indicating device shall either automatically maintain
> a \"center of zero\" condition to ± ¼ scale division or less, or have
> an auxiliary or supplemental \"center-of-zero\" indicator that defines
> a zero‑balance condition to ± ¼ scale division or less.
>
> \(c\) Verification of the accuracy of the center of zero indication to
> ± ¼ scale division or less during **~~dynamic~~
> [automatic]{.underline}** operation is not required on automatic
> checkweighers.

[**(Amended 2004**)]{.underline}

> **S.1.2. Value of Division Units.** - The value of a division \"d\"
> expressed in a unit of weight shall be equal to:
>
> \(a\) 1, 2, or 5; or
>
> \(b\) a decimal multiple or submultiple of 1, 2, or 5.
>
> **S.1.2.1. Weight Units.** -- **[Except for postal scales, indicating
> and recording elements for shipping and postal applications, and
> scales used to print standard pack labels,]{.underline} ~~A~~**
> [a]{.underline} device shall indicate weight values using only a
> single unit of measure.

**[(Amended 2004)]{.underline}**

> **S.1.3. Provision for Sealing.**
>
> \(a\) **Automatic Weighing Systems, Except Automatic Checkweighers.
> -** A device shall be designed with provision(s) as specified in Table
> S.1.3., \"Categories of Device and Methods of Sealing,\" for applying
> a security seal that must be broken, or for using other approved means
> of providing security (e.g., data change audit trail available at the
> time of inspection), before any change that detrimentally affects the
> metrologi­cal integrity of the device can be made to any electronic
> mechanism.
>
> \(b\) **For Automatic Checkweighers. -** Security seals are not
> required in **~~field~~** applications where it would prohibit an
> authorized user from having access to the calibration functions of a
> device.

+----------------------------------+-----------------------------------+
| **Table S.1.3.**                 |                                   |
|                                  |                                   |
| **Categories of Device and       |                                   |
| Methods of Sealing**             |                                   |
+----------------------------------+-----------------------------------+
| **Categories of Device**         | **Method of Sealing**             |
+----------------------------------+-----------------------------------+
| Category 1: No Remote            | Seal by physical seal or two      |
| configuration capability.        | event counters: one for           |
|                                  | calibration parameters and one    |
|                                  | for configuration parameters.     |
+----------------------------------+-----------------------------------+
| Category 2: Remote configuration | The hardware enabling access for  |
| capability, but access is        | remote communication must be at   |
| controlled by physical hardware. | the device and sealed using a     |
|                                  | physical seal or two event        |
| The device shall clearly         | counters: one for calibration     |
| indicate that it is in the       | parameters and one for            |
| remote configuration mode and    | configuration parameters.         |
| record such message if capable   |                                   |
| of printing in this mode.        |                                   |
+----------------------------------+-----------------------------------+
| Category 3: Remote configuration | An event logger is required in    |
| capability access may be         | the device; it must include an    |
| unlimited or controlled through  | event counter (000 to 999), the   |
| a software switch (e.g.,         | parameter ID, the date and time   |
| password).                       | of the change, and the new value  |
|                                  | of the parameter. A printed copy  |
|                                  | of the information must be        |
|                                  | available through the device or   |
|                                  | through another on-site device.   |
|                                  | The event logger shall have a     |
|                                  | capacity to retain records equal  |
|                                  | to ten times the number of        |
|                                  | sealable parameters in the        |
|                                  | device, but not more than         |
|                                  | 1000 records are required. (Note: |
|                                  | Does not require 1000 changes to  |
|                                  | be stored for each parameter.)    |
+----------------------------------+-----------------------------------+

> **S.1.4. Automatic Calibration. -** A device may be fitted with an
> automatic or a semi-automatic calibration mechanism. This mechanism
> shall be incorporated inside the device. After sealing, neither the
> mechanism nor the calibration process shall facilitate fraud.
>
> **S.1.5. Adjustable Components. -** Adjustable components shall be
> held securely in adjustment and, except for a zero-load balance
> mechanism, shall be located within the housing of the element.

**S.2. Design of Zero and Tare Mechanisms.**

> **S.2.1. Zero Load Adjustment.**
>
> **S.2.1.1. Automatic Zero-Set­ting Mech­anism
> [­(Zero-tracking)]{.underline}. -** Except for automatic checkweighers,
> under normal operating conditions the maximum load that can be
> \"rezeroed,\" when either placed on or removed from the platform all
> at once, shall be 1.0 scale division.

**[(Amended 2004)]{.underline}**

> **S.2.1.2. Initial Zero-Setting Mechanism. -** Except for automatic
> checkweighers, an initial zero-setting mechanism shall not zero a load
> in excess of 20 % of the maximum capacity of the automatic weighing
> system unless tests show that the scale meets all applicable
> tolerances for any amount of initial load compensated by this device
> within the specified range.
>
> **S.2.2. Tare.** - On any automatic weighing system the value of the
> tare division shall be equal to the value of the scale division. The
> tare mechanism shall operate only in a backward direction (i.e., in a
> direction of underregistration) with respect to the zero-load balance
> condition of the automatic weighing system. A device designed to
> automatically clear any tare value shall also be designed to prevent
> the automatic clearing of tare until a complete transaction has been
> indicated.
>
> **Note:** On a computing automatic weighing system, this requires the
> input of a unit price, the display of the unit price, and a computed
> positive total price at a readable equilibrium. Other devices require
> a **~~complete~~** **[.]{.underline} ~~weighing operation, including
> tare, net, and gross weight determination~~ [transaction or lot run
> ~~has been~~ be completed]{.underline}**

**[(Amended 2004)]{.underline}**

**S.3.1. Multiple Range and Multi-Interval Automatic Weighing System.**
The value of \"e\" shall be equal to the value of \"d.\"

> **S.3.2. Load Cell Verification Interval Value. -** The relationship
> of the value for the load cell verification scale interval, v~min~, to
> the scale division \"d\" for a specific scale installation shall be:
>
> $v_{\text{min}} \leq \frac{d}{\sqrt{N}}$
>
> , where N is the number of load cells in the scale.
>
> **Note:** When the value of the scale division \"d\" differs from the
> verification scale division \"e\" for the scale, the value of \"e\"
> must be used in the formula above.
>
> **S.3.3. -** For automatic checkweighers, the value of \"e\" shall be
> specified by the manufacturer and may be larger than \"d,\" but in no
> case can \"e\" be more than 10 times the value of \"d.\"

**S.4. Weight Indicators, Weight Displays, Reports, and Labels.**

S.4.1. Weight Units. - An indicating or recording element shall indicate
weight values using only a single unit of measure.

> **S.4.~~2~~[1]{.underline}. Additional Digits in Displays. -**
> Auxiliary digital displays that provide additional digits for use
> during performance evaluation may be included on automatic
> checkweighers. However, in cases where these indications are not valid
> for determining the actual weight of a package (e.g., only appropriate
> for use in statistical process control programs by users) they shall
> be clearly and distinctly differentiated from valid weight displays by
> indicating them to the user.
>
> For example, the additional digits may be differentiated by color,
> partially covered by placing crosshatch overlays on the display, or
> made visible only after the operator presses a button or turns a key
> to set the device in a mode which enables the additional digits.
>
> **S.4.~~3~~[2]{.underline}. Damping. -** An indicating element
> equipped with other than automatic recording elements shall be
> equipped with effective means to permit the recording of weight values
> only when the indication is stable within plus or minus one scale
> division. The values recorded shall be within applicable tolerances.
>
> **S.4.~~4~~[3]{.underline}. Over Capacity Indication. -** An
> indicating or recording element shall not display nor record any
> values when the scale capacity is exceeded by nine scale divisions.
>
> **S.4.~~5~~[4]{.underline}. Label Printer. -** A device that produces
> a printed ticket to be used as the label for a package shall print all
> values digitally and of such size, style of type, and color as to be
> clear and conspicuous on the label.
>
> **S.4.~~5~~.[4]{.underline}1. Label Printing. -** If an automatic
> checkweigher prints a label containing weight information that will be
> used in a commercial transaction, it must conform to all of the
> requirements specified for weigh-labelers so that the printed ticket
> meets appropriate requirements.

**S.5. Accuracy Class.**

> **S.5.1. Marking. -** Weigh-labelers and automatic checkweighers shall
> be Class III devices and shall be marked accordingly, except that a
> weigh-labeler marked Class IIIS may be used in package shipping
> applications.
>
> (Amended 1997)

**S.6. Parameters for Accuracy Classes. -** The number of divisions for
device capacity is designated by the manufacturer and shall comply with
parameters shown in Table S.6.

+-----------+-------------------------------+------------+-------------+
| **Table   |                               |            |             |
| S.6.**    |                               |            |             |
|           |                               |            |             |
| **P       |                               |            |             |
| arameters |                               |            |             |
| for       |                               |            |             |
| Accuracy  |                               |            |             |
| Classes** |                               |            |             |
+-----------+-------------------------------+------------+-------------+
|           |                               | **Number   |             |
|           |                               | of         |             |
|           |                               | divisions  |             |
|           |                               | (n)**      |             |
+-----------+-------------------------------+------------+-------------+
| **Class** | **Value of the verification   | *          | **Maximum** |
|           | division (~~d or~~ e)**       | *Minimum** |             |
+-----------+-------------------------------+------------+-------------+
| ##        |                               |            |             |
|  SI Units |                               |            |             |
+-----------+-------------------------------+------------+-------------+
| III       | 0.1 to 2g inclusive           | 100        | 10 000      |
+-----------+-------------------------------+------------+-------------+
|           | equal to or greater than 5g   | 500        | 10 000      |
+-----------+-------------------------------+------------+-------------+
| #         |                               |            |             |
| # INCH-PO |                               |            |             |
| UND Units |                               |            |             |
+-----------+-------------------------------+------------+-------------+
| III       | 0.0002 lb to 0.005 lb,        | 100        | 10 000      |
|           | inclusive                     |            |             |
+-----------+-------------------------------+------------+-------------+
|           | 0.005 oz to 0.125 oz,         | 100        | 10 000      |
|           | inclusive                     |            |             |
+-----------+-------------------------------+------------+-------------+
|           | equal to or greater than      | 500        | 10 000      |
|           | 0.01 lb                       |            |             |
+-----------+-------------------------------+------------+-------------+
|           | equal to or greater than      | 500        | 10 000      |
|           | 0.25 oz                       |            |             |
+-----------+-------------------------------+------------+-------------+
| IIIS      | greater than 0.01 lb          | 100        | 1000        |
+-----------+-------------------------------+------------+-------------+
|           | greater than 0.25 oz          | 100        | 1000        |
+-----------+-------------------------------+------------+-------------+
| For Class |                               |            |             |
| III       |                               |            |             |
| devices,  |                               |            |             |
| the value |                               |            |             |
| of \"e\"  |                               |            |             |
| is        |                               |            |             |
| specified |                               |            |             |
| by the    |                               |            |             |
| man       |                               |            |             |
| ufacturer |                               |            |             |
| as marked |                               |            |             |
| on the    |                               |            |             |
| device;   |                               |            |             |
| \"d\"     |                               |            |             |
| shall not |                               |            |             |
| be        |                               |            |             |
| smaller   |                               |            |             |
| than      |                               |            |             |
| 0         |                               |            |             |
| .1 \"e.\" |                               |            |             |
| \"e\"     |                               |            |             |
| shall be  |                               |            |             |
| diffe     |                               |            |             |
| rentiated |                               |            |             |
| from      |                               |            |             |
| \"d\" by  |                               |            |             |
| size,     |                               |            |             |
| shape, or |                               |            |             |
| color.    |                               |            |             |
|           |                               |            |             |
| **        |                               |            |             |
| [(Amended |                               |            |             |
| 20        |                               |            |             |
| 04)]{.und |                               |            |             |
| erline}** |                               |            |             |
+-----------+-------------------------------+------------+-------------+

**S.7. Marking Requirements. \[See also G-S.1., G‑S.4., G-S.6., G-S.7.,
G-U.2.1.1., and UR.3.3.\]**

> **S.7.1. Location of Marking Information. -** Automatic weighing
> systems which are not permanently attached to an indicating element,
> and for which the load-receiving element is the only part of the
> weighing/load-receiving element visible after installation, may have
> the marking information required in G-S.1. of the General Code and
> Table S.7.a. and S.7.b. of the Automatic Weighing Systems Code located
> in an area that is accessible only through the use of a tool; provided
> that the information is easily accessible (e.g., the information may
> appear on the junction box under an access plate). The identification
> information for these automatic weighing systems shall be located on
> the weighbridge (load-receiving element) near the point where the
> signal leaves the weighing element or beneath the nearest access
> cover.
>
> **S.7.2. Marking Required on Components of Automatic Weighing Systems.
> -** The following components of automatic weighing systems shall be
> marked as specified in Tables S.7.a. and S.7.b.:
>
> \(a\) Main elements and components when not contained in a single
> enclosure for the entire automatic weighing system;
>
> \(b\) Load cells for which Certificates of Conformance (CC) have been
> issued under the National Type Evaluation Program; and
>
> \(c\) Other equipment necessary to a weighing system but having no
> metrological effect on the weighing system.

+-----------------+-----------+-----------+-----------+-----+-------+
| **Table         |           |           |           |     |       |
| S.7.a.**        |           |           |           |     |       |
| **Marking       |           |           |           |     |       |
| Requirements**  |           |           |           |     |       |
+=================+===========+===========+===========+=====+=======+
| **To Be**       | *         |           |           |     |       |
|                 | *Weighing |           |           |     |       |
| **Marked With   | Eq        |           |           |     |       |
| **             | uipment** |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
|                 | **        | **I       | *         | **L | **    |
|                 | Weighing, | ndicating | *Weighing | oad | Other |
|                 | load-r    | element   | and       | c   | equi  |
|                 | eceiving, | not       | load-     | ell | pment |
|                 | and       | pe        | receiving | w   | or    |
|                 | i         | rmanently | element   | ith | d     |
|                 | ndicating | attached  | not       | CC  | evice |
|                 | element   | to        | pe        | (10 | (9)** |
|                 | in same   | weighing  | rmanently | )** |       |
|                 | housing** | and       | attached  |     |       |
|                 |           | load-     | to        |     |       |
|                 |           | receiving | i         |     |       |
|                 |           | element** | ndicating |     |       |
|                 |           |           | element** |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Manufacturer\'s | x         | x         | x         | x   | x     |
| ID (1)          |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Model           | x         | x         | x         | x   | x     |
| Designation (1) |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Serial Number   | x         | x         | x         | x   | x     |
| and Prefix (2)  |           |           |           |     | (13)  |
+-----------------+-----------+-----------+-----------+-----+-------+
| Certificate of  | x         | x         | x         | x   | x     |
| Conformance     |           |           |           |     | (16)  |
| Number (16)     |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Accuracy Class  | x         | x (8)     | x         | x   |       |
| (14)            |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Nominal         | x         | x         | x         |     |       |
| Capacity        |           |           |           |     |       |
| (3)(15)         |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Value of        | x         | x         |           |     |       |
| Division, d (3) |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Value of \"e\"  | x         | x         |           |     |       |
| (4)             |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Temperature     | x         | x         | x         | x   |       |
| Limits (5)      |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Special         | x         | x         | x         |     |       |
| Application     |           |           |           |     |       |
| (11)            |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Maximum Number  |           | x (8)     | x         | x   |       |
| of Scale        |           |           |           |     |       |
| Divisions,      |           |           |           |     |       |
| n~max~ (6)      |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Minimum         |           |           | x         |     |       |
| Verification    |           |           |           |     |       |
| Division,       |           |           |           |     |       |
| (e~min~)        |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| \"S\" or \"M\"  |           |           |           | x   |       |
| (7)             |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Direction of    |           |           |           | x   |       |
| Loading (12)    |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Minimum Dead    |           |           |           | x   |       |
| Load            |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Maximum         | x         |           |           | x   |       |
| Capacity        |           |           |           |     |       |
| [(]{            |           |           |           |     |       |
| .underline}Max) |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Minimum         | x         |           |           |     |       |
| Capacity        |           |           |           |     |       |
| (Min            |           |           |           |     |       |
| [)]{.underline} |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Safe Load Limit |           |           |           | x   |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Load Cell       |           |           |           | x   |       |
| Verification    |           |           |           |     |       |
| Interval        |           |           |           |     |       |
| (v~min~)        |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| Maximum Belt    | x         |           | x         |     |       |
| Speed (m/sec or |           |           |           |     |       |
| m/min)          |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+
| **Note:** See   |           |           |           |     |       |
| Table S.7.b.    |           |           |           |     |       |
| for applicable  |           |           |           |     |       |
| parenthetical   |           |           |           |     |       |
| notes.          |           |           |           |     |       |
|                 |           |           |           |     |       |
| (Amended 1999)  |           |           |           |     |       |
+-----------------+-----------+-----------+-----------+-----+-------+

+-----------------------------------------------------------------------+
| **Table S.7.b.**                                                      |
|                                                                       |
| **Notes for Table S.7.a.**                                            |
+=======================================================================+
| 1.  Manufacturer\'s identification and model designation. (See        |
|     G-S.1.)                                                           |
|                                                                       |
| 2.  Serial number and prefix. (See G-S.1.)                            |
|                                                                       |
| 3.  The nominal capacity and value of the automatic weighing system   |
|     division shall be shown together (e.g., 50 000 x 5 kg, or 30 x    |
|     0.01 lb) adjacent to the weight display when the nominal capacity |
|     and value of the automatic weighing system division are not       |
|     immediately apparent. Each division value or weight unit shall be |
|     marked on variable‑division value or division-unit automatic      |
|     weighing systems.                                                 |
|                                                                       |
| 4.  Required only if different from \"d.\"                            |
|                                                                       |
| 5.  Required only on automatic weighing systems if the range is other |
|     than -10 °C to 40 °C (14 °F to 104 °F).                           |
|                                                                       |
| 6.  This value may be stated on load cells in units of 1000; (e.g.,   |
|     n: 10 is 10 000 divisions.)                                       |
|                                                                       |
| 7.  Denotes compliance for single or multiple load cell applications. |
|                                                                       |
| 8.  An indicating element not permanently attached to a weighing      |
|     element shall be clearly and permanently marked with the accuracy |
|     Class III, or IIIS and the maximum number of divisions, n~max~.   |
|                                                                       |
| 9.  Necessary to the weighing system but having no metrological       |
|     effect, e.g., auxiliary remote display, keyboard, etc.            |
|                                                                       |
| 10. The markings may be either on the load cell or in an accompanying |
|     document; except that, if an accompanying document is provided,   |
|     the serial number shall appear both on the load cell and in the   |
|     document. The manufacturer\'s name or trademark, the model        |
|     designation, and identifying symbol for the serial number shall   |
|     also be marked both on the load cell and in any accompanying      |
|     document.                                                         |
|                                                                       |
| 11. An automatic weighing system designed for a special application   |
|     rather than general use shall be conspicuously marked with        |
|     suitable words visible to the operator and customer restricting   |
|     its use to that application.                                      |
|                                                                       |
| 12. Required if the direction of loading the load cell is not         |
|     obvious.                                                          |
|                                                                       |
| 13. Serial number and prefix (See G-S.1) Modules without              |
|     "intelligence" on a modular system (e.g., printer, keyboard       |
|     module, cash drawer, and secondary display in a point-of-sale     |
|     system) are not required to have serial numbers.                  |
|                                                                       |
| 14. The accuracy Class of a device shall be marked on the device with |
|     the appropriate designation.                                      |
|                                                                       |
| 15. The nominal capacity shall be conspicuously marked on any         |
|     automatic-indicating or recording automatic weighing system so    |
|     constructed that the capacity of the indicating or recording      |
|     element, or elements, is not immediately apparent.                |
|                                                                       |
| 16. Required only if a CC has been issued for the equipment.          |
+-----------------------------------------------------------------------+

**N. Notes**

**N.1. Test Requirements for Automatic Weighing Systems.**

> **N.1.1. Test Pucks and Packages.**
>
> \(a\) Test pucks and packages shall be:
>
> \(i\) representative of the type, size, and weight ranges to be
> weighed on a device, and
>
> \(ii\) stable while in motion, hence the length and width of a puck or
> package should be greater than its height.
>
> \(b\) For type evaluation the manufacturer shall supply the test pucks
> or packages for each range of test loads.
>
> (Amended 1997)
>
> **N.1.2. Accuracy of Test Pucks or Packages. -** The error in any test
> puck or package shall not exceed one-fourth (1/4) of the acceptance
> tolerance. If packages are used to conduct field tests on automatic
> weighing systems, the package weights shall be determined on a
> reference scale or balance with an inaccuracy that does not exceed
> one‑fifth (1/5) of the smallest tolerance that can be applied to the
> device under test.
>
> **N.1.3. Verification (Testing) Standards.** - Field standard weights
> shall comply with requirements of NIST Handbook 105‑1 (Class F) or the
> tolerances expressed in Fundamental Considerations, paragraph 3.2.
> (i.e., one-third of the smallest tolerance applied).
>
> [**N.1.4. Radio Frequency Interference (RFI) and Other Electromagnetic
> Interference Susceptibility, Field Evaluation.** ‑ **An RFI test shall
> be conducted at a given installation when the presence of RFI has been
> verified and charac­terized if those conditions are considered \"usual
> and cus­tomary.\"**]{.underline}
>
> **[(Added 2004)]{.underline}**

**~~N.2. Test Requirements for Automatic Weighing Systems.~~**

> **N. ~~2.~~[1.5]{.underline}. Tests Loads. -** A performance test
> shall consist of four separate test runs conducted at different test
> loads according to Table N**. ~~3.2~~[1.5]{.underline}.**

  -----------------------------------------------------------------------
  **Table N. ~~3.2~~[1.5]{.underline}. Test Loads**

  At or near minimum capacity

  At or near maximum capacity

  At two (2) critical points between minimum and maximum capacity

  Test may be conducted at other loads if the device is intended for use
  at other specific capacities
  -----------------------------------------------------------------------

> **N. ~~2.2~~[1.6]{.underline}. Influence Factor Testing. -** Influence
> factor testing shall be conducted statically.

**N.~~3~~[2]{.underline}. Test Procedures - Weigh-Labelers. -** If the
device is designed for use in **~~static~~ [a
non-automatic]{.underline}** weighing **[mode]{.underline},** it shall
be tested **~~statically using mass standards~~ [in the non-automatic
mode according to Handbook 44 Section 2.20 Scales Code]{.underline}.**

**Note:** If the device is designed for only **~~dynamic~~
[automatic]{.underline}** weighing, it shall only be tested
**~~dynamically~~ [in the automatic mode]{.underline}.**

**[(Amended 2004)]{.underline}**

> **N.~~3~~[2]{.underline}.1. ~~Laboratory Static~~
> [Non-automatic]{.underline} Tests.**
>
> **N.~~3~~[2]{.underline}.1.1. Increasing‑Load Test. -** The
> increasing‑load test shall be conducted with the test loads
> approximately centered on the load‑receiving element of the scale.
>
> **N.~~3~~[2]{.underline}.1.2. Decreasing‑Load Test. -** The
> decreasing‑load test shall be conducted with the test loads
> approximately centered on the load‑receiving element of the scale.
>
> **N.~~3~~[2]{.underline}.1.3. Shift Test. -** To determine the effect
> of off-center loading, a test load equal to one-half (½) maximum
> capacity shall be placed in the center of each of the four points
> equidistant between the center and front, left, back, and right edges
> of the load receiver.
>
> **N.~~3~~[2]{.underline}.1.4. Discrimination Test. -** A
> discrimination test shall be conducted with the weighing device in
> equilibrium at zero­ load and at maximum test load, and under
> controlled conditions in which environ­mental factors are reduced to
> the extent that they will not affect the results obtained. This test
> is conducted from just below the lower edge of the zone of uncertainty
> for increasing load tests, or from just above the upper edge of the
> zone of uncertainty for decreasing‑load tests.
>
> **N.~~3~~[2]{.underline}.1.5. Zero‑Load Balance Change. -** A
> zero‑load balance change test shall be con­ducted on all automatic
> weighing systems after the removal of any test load. The zero‑load
> balance should not change by more than the minimum tolerance
> applicable. (Also see G‑UR.4.2.)
>
> **~~N.3.1.6. Influence Factor Testing. - Influence factor testing
> shall be conducted.~~**

**[(Amended 2004)]{.underline}**

> **~~N.3.2. Laboratory - Dynamic Tests. - The device shall be tested at
> the highest speed for each weight range using standardized test pucks
> or packages. Test runs shall be conducted using four test loads as
> described in Table N.3.2. Each test load shall be run a minimum of
> 10 consecutive times.~~**
>
> **~~N.3.2.1. Shift Test. - To determine the effect of eccentric
> loading, for devices without a means to align packages, a test load
> equal to one-third (1/3) maximum capacity shall be passed over the
> load receiver or transport belt (1) halfway between the center and
> front edge, and (2) halfway between the center and back edge.~~**
>
> **N.~~3.3~~[2.2.]{.underline}~~.~~ ~~Field~~ [Automatic]{.underline}
> Test Procedures.**
>
> **N.~~3.3~~. [2.2.]{.underline}1. Tests [Non-automatic]{.underline}
> ~~Static~~. -** If the automatic weighing system is designed to
> operate **[non-automatically]{.underline}~~statically~~,** and used in
> that manner, during normal use operation, it shall be tested
> **[non-automatically]{.underline}~~statically~~** using mass
> standards. The device shall not be tested **~~statically~~
> [non-automatically]{.underline}** if it is used only
> **~~dynamically~~[in the automatic mode]{.underline}.**
>
> **N.~~3.3~~[2.2.]{.underline}2. ~~Dynamic~~[Automatic]{.underline}
> Tests. -** The device shall be tested at the normal operating speed
> using packages. Test runs should be conducted using at least two test
> loads distributed over its normal weighing range (e.g., **~~at~~
> [near]{.underline}** the lowest and highest ranges in which the device
> is typically operated.) Each test load should be run a minimum of
> 10 consecutive times.

(Amended 2004)

**N. ~~4 ~~[3]{.underline}. Test Procedures - Automatic Checkweigher.**

> **N. ~~4 ~~[3]{.underline}.1. ~~Laboratory - Static~~ Tests
> Non-Automatic. -** If the scale is designed to operate
> **[non-]{.underline}~~statically~~ [automatically
> ]{.underline}**during normal user operation, it shall be tested
> **~~statically~~ [non-automatically]{.underline} [according to
> paragraphs N.2.1.1. Increasing Load Tests through N.2.1.5.
> Zero-Balance Change]{.underline} ~~using the applicable weigh-labeler
> requirements~~.**

**[(Amended 2004)]{.underline}**

> **N. ~~4 ~~.[3]{.underline}.2. ~~Laboratory - Dynamic~~
> [Automatic]{.underline} Tests. -** The device shall be tested at the
> highest speed in each weight range using standardized test pucks or
> packages. Test runs shall be conducted using
> **[two]{.underline}~~four~~** test loads. The number of consecutive
> test weighments shall **[one-half (1/2) of those
> specified]{.underline} ~~be as described~~** in Table
> N**.[3.]{.underline}**~~4~~.2. **[but not less than 10.]{.underline}**

**[(Amended 2004)]{.underline}**

+----------------------------------------+-----------------------------+
| **Table N. ~~4 ~~.[3.]{.underline}2.   |                             |
| Number of Sample Weights per Test for  |                             |
| Automatic Checkweighers**              |                             |
+----------------------------------------+-----------------------------+
| **Weighing Range**                     | **Number of sample weights  |
|                                        | per test**                  |
| **m = mass of test load**              |                             |
+----------------------------------------+-----------------------------+
| 20 divisions [\<]{.underline} m        | 60                          |
| [\<]{.underline} 10 kg                 |                             |
|                                        |                             |
| 20 divisions [\<]{.underline} m        |                             |
| [\<]{.underline} 22 lb                 |                             |
+----------------------------------------+-----------------------------+
| 10 kg \<m [\<]{.underline} 25 kg       | 32                          |
|                                        |                             |
| 22 lb \<m [\<]{.underline} 55 lb       |                             |
+----------------------------------------+-----------------------------+
| 25 kg \<m [\<]{.underline} 100 kg      | 20                          |
|                                        |                             |
| 55 lb \<m [\<]{.underline} 220 lb      |                             |
+----------------------------------------+-----------------------------+
| 100 kg (220 lb) \< m                   | 10                          |
+----------------------------------------+-----------------------------+

> **~~N.4.3. Field Test Procedures.~~**
>
> **~~N.4.3.1. Static Tests. - If the scale is designed to operate
> statically during normal user operation, it shall be tested statically
> according to Sections N.3.1.1. through N.3.1.5.~~**
>
> **~~N.4.3.2. Dynamic Tests. - The device shall be tested dynamically
> at the highest normal operating speed using packages at two test loads
> distributed over its normal weighing range. The number of consecutive
> weighments shall be one-half (½) of those specified in Table N.4.2.,
> but not less than 10.~~**

**T. Tolerances**

**T.1. Principles.**

> **T.1.1. Design. -** The tolerance for a weighing device is a
> performance requirement independent of the design principle used.
>
> **T.1.2. Scale Division. -** The tolerance for a weighing device is
> related to the value of the scale division (d) or the value of the
> verification scale division (e) and is generally expressed in terms of
> d or e. The random tolerance for automatic checkweighers is expressed
> in terms of Maximum Allowable Variance (MAV).

**T.2. Tolerance Application.**

> **T.2.1. General. -** The tolerance values are positive (+) and
> negative (‑) with the weighing device adjusted to zero at no load.
> When tare is in use, the tolerance values are applied from the tare
> zero reference; the tolerance values apply to certified test loads
> only.
>
> **T.2.2. Type Evaluation Examinations. -** For type evaluation
> examinations, the tolerance values apply to increasing and decreasing
> load tests within the temperature~~,~~ **[and]{.underline}** power
> supply~~,~~ ~~and barometric pressure~~ limits specified in T.7.
> **[Influence Factors.]{.underline}**

**[(Amended 2004)]{.underline}**

> **T.2.3. Multiple Range and Multi-Interval Automatic Weighing
> System.** - For multiple range and multi-interval devices, the
> tolerance values are based on the value of the scale division of the
> range in use.

**T.3. Tolerance Values**.

> **­T.3.1. Tolerance Values - Class III Weigh-Labeler.** (See Section
> T.3.2. Class IIIS Weigh-Labelers)
>
> **T.3.1.1. ~~Static~~ [Non-automatic]{.underline} Tests.** - Tolerance
> values shall be as specified in Table T.3. Class III - Tolerances in
> Divisions.

**[(Amended 2004)]{.underline}**

> **T.3.1.2. ~~Dynamic~~[Automatic]{.underline} Tests.** - Acceptance
> tolerance values shall be the same as maintenance tolerance values
> specified in Table T.3., Class III - Tolerances in Divisions.

[**(Amended 2004**)]{.underline}

  -------------------------- ----------------------- -----------------------
  **Table T.3. Class III -                           
  Tolerance in Divisions                             
  (~~d~~[e]{.underline})**                           

  **Test Load in Divisions** **Tolerance in          
                             Divisions**             

  **Class III**              **Acceptance**          **Maintenance**

  0 - 500                    ± 0.5                   ± 1

  501 - 2000                 ± 1                     ± 2

  2001 - 4000                ± 1.5                   ± 3

  4001 +                     ± 2.5                   ± 5
  -------------------------- ----------------------- -----------------------

> **T.3.2. Tolerance Values - Class IIIS Weigh-labelers in Package
> Shipping Applications.**
>
> **(**Added 1997)
>
> **T.3.2.1. ~~Static~~ [Non-automatic]{.underline} Tests.** - Tolerance
> values shall be as specified in Table T.3.2.1. **~~Static~~
> [Non-automatic ]{.underline}**Tolerances for Class IIIS
> Weigh-labelers.

**[(Amended 2004)]{.underline}**

> **T.3.2.2. ~~Dynamic~~[Automatic]{.underline} Tests. -** Tolerance
> values specified in Table T.3.2.2. **~~Dynamic~~
> [Automatic]{.underline}** Tolerances for Class IIIS Weigh-labelers
> shall be applied.

**[(Amended 2004)]{.underline}**

+----------+----------+----------+---+----------+----------+----------+
| **Table  |          |          |   | **Table  |          |          |
| T.3.2.1. |          |          |   | T.3.2.2. |          |          |
| ~~       |          |          |   | ~~       |          |          |
| Static~~ |          |          |   | Dynamic~ |          |          |
| [No      |          |          |   | ~[Automa |          |          |
| n-automa |          |          |   | tic]{.un |          |          |
| tic]{.un |          |          |   | derline} |          |          |
| derline} |          |          |   | Tol      |          |          |
| Tol      |          |          |   | erance** |          |          |
| erance** |          |          |   |          |          |          |
|          |          |          |   | **for    |          |          |
| **for    |          |          |   | Class    |          |          |
| Class    |          |          |   | IIIS     |          |          |
| IIIS     |          |          |   | Weigh-la |          |          |
| Weigh-la |          |          |   | belers** |          |          |
| belers** |          |          |   |          |          |          |
+----------+----------+----------+---+----------+----------+----------+
| **Test   | **T      |          |   | **Test   | **T      |          |
| Load in  | olerance |          |   | Load in  | olerance |          |
| Div      | in       |          |   | Div      | in       |          |
| isions** | Div      |          |   | isions** | Div      |          |
|          | isions** |          |   |          | isions** |          |
+----------+----------+----------+---+----------+----------+----------+
| **Class  | **Acce   | **Maint  |   | **Class  | **Acce   | **Maint  |
| IIIS**   | ptance** | enance** |   | IIIS**   | ptance** | enance** |
+----------+----------+----------+---+----------+----------+----------+
| 0 - 50   | ± 0.5    | ± 1      |   | 0 - 50   | ± 1.5    | ± 2      |
+----------+----------+----------+---+----------+----------+----------+
| 51 - 200 | ± 1      | ± 2      |   | 51 - 20  | ± 2      | ± 3      |
+----------+----------+----------+---+----------+----------+----------+
| 201 -    | ± 1.5    | ± 3      |   | 201 -    | ± 2.5    | ± 4      |
| 1000     |          |          |   | 1000     |          |          |
+----------+----------+----------+---+----------+----------+----------+
| (Added   |          |          |   | (Added   |          |          |
| 1997)    |          |          |   | 1997)    |          |          |
| **[      |          |          |   | **[      |          |          |
| (Amended |          |          |   | (Amended |          |          |
| 2004     |          |          |   | 2004     |          |          |
| )]{.unde |          |          |   | )]{.unde |          |          |
| rline}** |          |          |   | rline}** |          |          |
+----------+----------+----------+---+----------+----------+----------+

> **T.3.3. Tolerance Values. - Automatic Checkweighers.**
>
> **T.3.3.1. Laboratory Tests for Automatic Checkweighers.**
>
> **T.3.3.1.1. ~~Static~~[Non-automatic]{.underline} Tests.** - The
> acceptance tolerance values specified in Table T.3., Class
> III-Tolerances in Divisions, shall be applied.
>
> **[(Amended 2004)]{.underline}**
>
> **T.3.3.1.2. ~~Dynamic~~[Automatic]{.underline} Tests.**
>
> \(a\) The systematic error for each test run must be within the
> acceptance tolerances for the test loads as specified in Table N**.
> ~~3.2.~~ [1.5.]{.underline}**
>
> \(b\) The standard deviation of the results shall not exceed one-ninth
> (1/9) of the Maximum Allowable Variation (MAV) for specific package
> weights (3 standard deviations cannot exceed one-third (1/3) of the
> MAV value) as required in the **~~4th~~ [current]{.underline}**
> Edition of NIST Handbook 133. This value does not change regardless of
> whether acceptance, or maintenance tolerances are being applied to the
> device under test.
>
> **[(Amended 2004)]{.underline}**
>
> \(i\) For U.S. Department of Agriculture (USDA) inspected meat and
> poultry products packaged at a plant subject to inspection by the USDA
> Food Safety and Inspection Service, use Handbook 133 Table 2‑9, U.S.
> Department of Agriculture, Meat and Poultry, Groups and Lower Limits
> for Individual Packages, or
>
> \(ii\) for all other packages with a labeled net quantity in terms of
> weight use Handbook 133 Table 2‑5, Maximum Allowable Variations for
> Packages Labeled by Weight.
>
> \(iii\) For all packages with a labeled net quantity in terms of
> liquid or dry volume use Handbook 133 Table 2‑6, Maximum Allowable
> Variations for Packages Labeled by Liquid or Dry Volume.
>
> **[(Amended 2004)]{.underline}**
>
> **T.3.3.2. Field Tests for Automatic Checkweighers.**
>
> **T.3.3.2.1. ~~Static~~[Non-automatic]{.underline} Test
> Tolerances.** - The tolerance values shall be as specified in Table
> T.3., Class III-Tolerances in Divisions.
>
> **T.3.3.2.2. ~~Dynamic~~[Automatic]{.underline} Test Tolerances. -**
>
> \(a\) The systematic error requirement is not applied in a field test.
>
> \(b\) The standard deviation of the test results shall not exceed
> one-ninth (1/9) of the Maximum Allowable Variation (MAV) for specific
> package weights (3 standard deviations cannot exceed one-third (1/3)
> of the MAV value) as required in the **~~4th~~ [current]{.underline}**
> Edition of NIST Handbook 133.
>
> This value does not change regardless of whether acceptance or
> maintenance tolerances are being applied to the device under test.
>
> \(i\) For U.S. Department of Agriculture (USDA) inspected meat and
> poultry products packaged at a plant subject to inspection by the USDA
> Food Safety and Inspection Service, use Handbook 133 Table 2‑9, U.S.
> Department of Agriculture, Meat and Poultry, Groups and Lower Limits
> for Individual Packages, or
>
> \(ii\) For all other packages with a labeled net quantity in terms of
> weight use Handbook 133 Table 2‑5, Maximum Allowable Variations for
> Packages Labeled by Weight.

(iii) For all packages with a labeled net quantity in terms of liquid or
      dry volume use Handbook 133 Table 2‑6. Maximum Allowable
      Variations for Packages Labeled by Liquid or Dry Volume.

(Amended 2004)

**T.4. Agreement of Indications.** - In the case of a weighing system
equipped with more than one indicating element or indicating element and
recording element combination, the difference in the weight value
indications of any load shall not be greater than the absolute value of
the applicable tolerance for that load, and shall be within tolerance
limits.

**T.5. Repeatability.** - The results obtained from several weighings of
the same load under reasonably **~~static~~ [constant]{.underline}**
test conditions shall agree within the absolute value of the maintenance
tolerance for that load, and shall be within applicable tolerances.

(Amended 2004)

**T.6. Discrimination.** - A test load equivalent to 1.4 d shall cause a
change in the indicated or recorded value of at least 2.0 d. This
requires the zone of uncertainty to be not greater than 0.3 d (See N.
**~~3~~[2]{.underline}**.1.4.)

**T.7. Influence Factors.** - The following factors are applicable to
tests conducted under controlled conditions only.

> **T.7.1. Temperature.** - Devices shall satisfy the tolerance
> require­ments under the following temperature conditions:
>
> **T.7.1.1.** - If not specified in the operating instructions or if
> not marked on the device, the tempera­ture limits shall be: ‑10 °C to
> 40 °C (14 °F to 104 °F).
>
> **T.7.1.2.** - If temperature limits are specified for the device, the
> range shall be at least 30 °C (54 °F).
>
> **T.7.1.3. Temperature Effect on Zero-Load Balance.** - The zero-load
> indication shall not vary by more than one division per 5 °C (9 °F)
> change in temperature.
>
> **T.7.1.4. Operating Temperature.** - The indicating or recording
> element shall not display nor record any usable values until the
> operating temperature necessary for accurate weighing and a stable
> zero balance condi­tion have been attained.­

T.7.2. Barometric Pressure. - The zero indica­tion shall not vary by more
than one division for a change in baro­metric pressure of 1 kPa over the
total barometric pressure range of 95 kPa to 105 kPa (28 in to 31 in of
Hg).

> **T.7.** ~~3~~**[2]{.underline}. Electric Power Supply.**
>
> ~~**T.7.**[2]{.underline}**3.1. Power Supply, Voltage and
> Frequency.**~~
>
> **(a) ~~Alternating Current.~~ [Automatic weighing systems that
> operate using alternating current must perform within the conditions
> defined in paragraphs T3. through T.7., inclusive, from --15 % to
> +10 % of the marked nominal line voltage(s) at 60 Hz, or the voltage
> range marked by the manufacturer, at 60 Hz]{.underline}.~~Weighing
> devices that operate using alternating current must perform within the
> conditions defined in paragraphs T.3. through T.7., inclusive, over
> the line voltage range of 100 V to 130 V or 200 V to 250 V rms as
> appro­priate, and over the frequency range of 59.5 Hz to 60.5 Hz.~~**

(b) **[Automatic weighing systems that operate using DC current must
    perform within the conditions defined in paragraphs T3. through
    T.7., inclusive, from minimum operating voltage to + 20 % of the
    voltage marked on the instrument (nominal voltage).]{.underline}**

(c) **[Battery-operated electronic automatic weighing systems with
    external or plug-in power supply (AC or DC) shall either continue to
    function correctly or not indicate any weight values if the voltage
    is below the manufacturer's specified value, the latter being larger
    or equal to the minimum operating voltage.]{.underline}**

> **[Note: The minimum operating voltage is defined as the lowest
> possible operating voltage before the automatic weighing no longer
> indicates or records weight values.]{.underline}**
>
> **Note:** This requirement applies only to metrologically significant
> voltage supplies.
>
> (Amended 2001)
>
> **~~Battery. - Battery operated instruments shall not indicate nor
> record values outside the applicable tolerance limits when battery
> power output is excessive or deficient.~~**

**[(Amended 2004)]{.underline}**

> **T.7.~~3.~~2.[1.]{.underline} Power Interruption.** - A power
> interruption shall not cause an indicating or recording element to
> display or record any values outside the appli­cable tolerance limits.

**T.8. Radio Frequency Interference (RFI) and Other Electromag­netic­
In­terference Susceptibility.** - The difference be­tween the weight
indi­cation with the disturbance and the weight indication without the
disturbance [**(see also N.1.4.)**]{.underline} shall not exceed one
scale division (d) or the equipment shall:

> \(a\) blank the indication, or
>
> \(b\) provide an error message, or
>
> \(c\) the indication shall be so completely unstable that it could not
> be inter­preted, or transmitted into memory or to a recording element,
> as a correct measure­ment value.

(Amended 2004)

**UR.  User Requirements**

**UR.1. Selection Requirements.** - Equipment shall be suitable for the
service in which it is used with respect to elements of its design,
including but not limited to, its capacity, number of scale divisions,
value of the scale division or verification scale division, minimum
capacity, and computing capability.

> **UR.1.1. General.** - Automatic Weighing Systems shall be designated
> by the manufacturer for that service.
>
> **UR.1.2. Value of the Indicated and Recorded Scale Divi­sion.** - The
> value of the division as recorded shall be the same as the division
> value indicated.

**UR.2. Installation Requirements.**

> **UR.2.1. Protection From Environmental Factors.** - The indicating
> elements, the lever system or load cells, and the load­-receiving
> element of a perma­nently installed scale, and the indicating elements
> of a scale not intended to be permanently installed, shall be
> adequately pro­tected from environmental factors such as wind, weather,
> and RFI that may adversely affect the operation or perform­ance of the
> device.
>
> **UR.2.2. Foundation, Supports, and Clearance.** - The foun­dation and
> supports of any scale installed in a fixed location shall be such as
> to provide strength, rigidity, and permanence of all com­ponents, and
> clearance shall be provided around all live parts to the extent that
> no contacts may result when the load‑receiving element is empty, nor
> throughout the weighing range of the scale.
>
> **UR.2.3. Entry and Departure From Weighing Area.** - The belt or
> other conveyance that introduces the weighed load to the weighing zone
> and that carries the weighed load away from the weighing zone shall be
> maintained per the manufacturers recommendations.

**UR.3. Use Requirements.**

> **UR.3.1. Minimum Load.** - The minimum load shall be as specified by
> the manufacturer, but not less than 20 divisions since the use of a
> device to weigh light loads is likely to result in relatively large
> errors.
>
> **UR.3.1.1. Minimum Load for Class IIIS Weigh-labelers. -** The
> minimum load shall be as specified by the manufacturer, but not less
> than 10 divisions since the use of a device to weigh light loads is
> likely to result in relatively large errors.
>
> (Added 1997)
>
> **UR.3.2. Maximum Load.** - An automatic weighing system shall not be
> used to weigh a load of more than **~~the~~[its ]{.underline}**maximum
> capacity **~~of the automatic weighing system~~.**

**[(Amended 2004)]{.underline}**

> **UR.3.3. Special Designs.** - An automatic weighing system designed
> and marked for a special appli­cation shall not be used for other than
> its in­tended purpose.
>
> **UR.3.4. Use of Manual Gross Weight Entries.** - Manual entries are
> permitted only when a device or system is generating labels for
> standard weight packages.

**UR.4. Maintenance Requirements**.

> **UR.4.1. Balance Condition.** - If an automatic weighing system is
> equipped with a zero-load display, the zero‑load adjustment of an
> automatic weighing system shall be maintained so that the device
> indicates or records a zero­balance condition.
>
> **UR.4.2. Level Condition.** - If an automatic weighing system is
> equipped with a level‑condi­tion indicator, the automatic weighing
> system shall be maintained in level.
>
> **UR.4.3.** **Automatic Weighing System Modification.** - The length
> or the width of the load-­receiving element of an automatic weighing
> system shall not be increased beyond the manu­facturer\'s design
> dimension, nor shall the capacity of an automatic weighing system be
> increased beyond its design capacity by replacing or modifying the
> original primary indicating or recording element with one of a higher
> capacity, except when the modification has been approved by competent
> engineering author­ity, preferably that of the engineering department
> of the manu­facturer of the automatic weighing system, and by the
> weights and measures authority having jurisdiction over the automatic
> weighing system.

**D. Definitions**

**[automatic gravimetric filling machine (instrument). - A filling
machine or instrument that fills containers or packages with
predetermined and virtually constant mass of product from bulk by
automatic weighing, and which comprises essentially an automatic feeding
device or devices associates with one or more weighing units and the
appropriate discharge devices.]{.underline}**

**[(Added 2004)]{.underline}**

**automatic checkweigher. -** A**[n]{.underline} ~~dynamic~~** automatic
weighing system **[that does not require the intervention of an operator
during the weighing process]{.underline}** used to subdivide items of
different weights into one or more subgroups, such as identifying
packages that have acceptable or unacceptable fill levels ­**[according
to the value of the difference between their weight and a pre-determined
set point]{.underline}.** These systems may be used to fill standard
packages for compliance with net weight requirements.

(Amended 2004)

**automatic weighing system (AWS).** - An automatic weighing system is a
weighing device that, in combination with other hardware and/or software
components, automatically weighs discrete items **[and that does not
require the intervention of an operator during the weighing
process]{.underline}.** Examples include, but are not limited to,
weigh-labelers and checkweighers.

(Amended 2004)

**non-automatic checkweigher.** - **[A weighing instrument, that
requires the intervention of an operator during the weighing process,
used to subdivide items of different weights into one or more subgroups,
such as identifying packages that have acceptable or unacceptable fill
levels ­according to the value of the difference between their weight and
a pre-determined set point.]{.underline}**

> **[Notes: Determining the weighing result includes any intelligent
> action of the operator that affects the result, such as deciding and
> taking an action when an indication is stable or adjusting the weight
> of the weighed load.]{.underline}**
>
> **[Deciding that the weighing result is acceptable means - making a
> decision regarding the acceptance of each weighing result on observing
> the indication or releasing a print out. The weighing process allows
> the operator to take an action which influences the weighing result in
> the case where the weighing result is not acceptable.]{.underline}**

**[(Added 2004)]{.underline}**

[**non-automatic weighing system.** - **A weighing instrument or system
that requires the intervention of an operator during the weighing
process to determine the weighing result or to decide that it is
acceptable.**]{.underline}

> **[Notes: Determining the weighing result includes any intelligent
> action of the operator that affects the result, such as deciding and
> taking an action when an indication is stable or adjusting the weight
> of the weighed load.]{.underline}**
>
> **[Deciding that the weighing result is acceptable means - making a
> decision regarding the acceptance of each weighing result on observing
> the indication or releasing a print out. The weighing process allows
> the operator to take an action which influences the weighing result in
> the case where the weighing result is not acceptable.]{.underline}**

**[(Added 2004)]{.underline}**

**package rate. -** PPM - Packages per minute.

**random error(s). -** The sample standard deviation of the error
(indicated values) for a number of consecutive automatic weighings of a
load, or loads, passed over the load receptor, shall be expressed
mathematically as:

> ![](media/image4.wmf)
>
> where: x = error of a load indication

n = the number of loads

**systematic (average) error** ![](media/image5.wmf)**. -** The mean
value of the error (of indication) for a number of consecutive automatic
weighings of a load, or loads, passed over the load receiving element
(e.g., weigh-table), shall be expressed mathematically as:

![](media/image6.wmf)

where: x = error of a load indication

n = the number of loads

**test puck.** -- A metal**[,]{.underline} ~~or~~** plastic**[, or other
suitable]{.underline}** object **[that remains stable for the duration
of the test,]{.underline} ~~object~~** used [**as a test
load**]{.underline} to simulate a package. Pucks can be made in a
variety of dimensions and have different weights to represent a wide
range of package sizes. Metal versions may be covered with rubber
cushions to eliminate the possibility of damage to weighing and handling
equipment. The puck mass is adjusted to **~~specific~~
[an]{.underline}** accuracy [**specified in** **N.1.2.Accuracy of Test
Pucks or Packages **]{.underline}**~~so that pucks can be used to
conduct performance tests~~**.

(Amended 2004)

**weigh-labeler. -** An automatic weighing system that determines the
weight of a package and prints a label or other document bearing a
weight declaration for each discrete item (usually a label also includes
unit and total price declarations). ~~**Typically, this type of weighing
system determines the weight of packages dynamically, but may also
include a scale that is incorporated in a conveyor system that weighs
packages in a static weighing mode**.~~ Weigh-labelers are sometimes
used to weigh and label standard and random packages (also called
\"Prepackaging Scales\").

(Amended 2004)

[^1]: ^^

    Chairman Jack Kane, Montana

    Clark Cooney, Oregon

    Carol P. Fulmer, South Carolina

    Michael J. Sikula, New York

    Ted Kingsbury, Canada, Technical Advisor

    Richard Suiter, NIST, Technical Advisor

    Juana Williams, NIST, Technical Advisor

    **Committee on Specifications and Tolerances**

[^2]: **[An automatic weighing system does not require the intervention
    of an operator during the weighing process]{.underline}. [The
    necessity to give instructions to start a process or to release a
    load, or the function of the instrument (static, dynamic, set‑up,
    etc.) are not relevant in deciding the category of automatic or
    non-automatic instruments.]{.underline}**

[^3]: **[Prepackaging scales (and other commercial devices) used for
    putting up packages in advance of sale are acceptable for use in
    commerce if all appropriate provisions of Handbook 44 are met. Users
    of such devices must be alert to the legal requirements relating to
    the declaration of quantity on a package. Such require­ments are to
    the effect that, on the average, the contents of the individual
    packages of a particular commodity comprising a lot, shipment, or
    delivery must contain at least the quantity declared on the label.
    The fact that a scale or other commercial device may overregister,
    but within established tolerances, and is approved for commercial
    service is not a legal justification for packages to contain, on the
    average, less than the labeled quantity.]{.underline}**

[^4]: **[See NIST Handbook 130, Uniform Laws and Regulations In the Area
    of Legal Metrology and Engine Fuel Quality, Interpretations and
    Guidelines paragraph 2.6.11. Good Quantity Control
    Practices]{.underline}.**