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The following tables contain lists of existing codes sections approaching their nonretroactive enforcement dates or recently adopted requiJanuary 1, 2007. These NIST Handbook 44, “Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring D

action by device manufacturers, owners/operators, or regulatory officials. This information is provided to alert interested parties to upco

Requirements in the tables are paraphrased; therefore, the latest edition of Handbook 44 should be consulted for the complete text. Cogreater clarity or make other editorial changes are not included in this information. A complete report of changes to the handbook is publNational Conference on Weights and Measures. Changes to requirements are also referenced in the amendments table in each edition of Han

you contact the statutory authority in your weights and measures jurisdiction for specific details on the enforcement of these code requir

Retroactive requirements apply to all equipment in commercial service prior to, and in use at any time on or after, the enforcement date

are enforceable for equipment: (1) manufactured, (2) new and used brought into a jurisdiction, and (3) previously in noncommercial ususe after the effective date. Note: Paragraphs designated with a bracketed superscript number one [1] include multiple requirements wi

NIST Handbook 44 Codes 

(With a Nonretroactive Enforcement Date On or After January 1, 2007) 

Code Section Paragraph Requirement 

1.10. General Code G-S.1. Identification (d); Software 

Identifier [1] 

For not built-for-purpose, software based devices, the current software version or revision identifier to be prefaced by words, an abbreviation, or a symbol, that clearly identifies the number as threquired version or revision. 

Abbreviations for the word “Version” shall, as a minimum, begin the letter “V” and may be followed by the word “NumbAbbreviations for the word “Revision” shall, as a minimum, begin the letter “R” and may be followed by the word “Number.” abbreviation for the word “Number” shall, as a minimum, begin witletter “N” (e.g., No or No.).

2.20. Scales S.2.1.3.1. Zero-Tracking for Scales 

Manufactured Between January 1, 1981 and January 1, 2007 

The maximum load that can be “rezeroed,” when either placed on 

removed from the platform all at once under normal operating conditions, shall be: 

(a) for bench, counter, and livestock scales: 0.6 scale division(b) for vehicle, axle-load, and railway track scales: 3.0 scale 

divisions; and 

(c) for all other scales: 1.0 scale division. 
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NIST Handbook 44 Codes 

(With a Nonretroactive Enforcement Date On or After January 1, 2007) 

Code Section Paragraph Requirement 

2.20. S.2.1.3.2. Zero-Tracking for Scales 

Manufactured On or After January 1, 2007 

The maximum load that can be “rezeroed,” when either placed on 

removed from the platform all at once under normal operating conditions, shall be: 

(a) for vehicle, axle-load, and railway track scales: 3.0 scale 

divisions; and 

 (b) for all other scales: 0.5 scale division. 
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NIST Handbook 44 Codes Newly Adopted or Recently Modified 

(Applicable to All Equipment Effective January 1, 2007) 

Code Section Paragraph Requirement New o

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2.20. Scales T.N.4.5.1. Time Dependence; Class II, III, and IIII Non-automatic 

Weighing Instruments 

Specifies the tolerances and a constant temperature, 20 °C ± 2 °C (68 °F ± 4 °F), at which the time dependence test shall 

be conducted during type evaluation on a non-automatic weighing instrument of Classes II, III, and IIII. 

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2.20. T.N.4.7. Creep Recovery for Load Cells During Type Evaluation The difference between the initial reading of the minimum load of the measuring range (Dmin) and the reading after 

returning to minimum load subsequent to the maximum load (Dmax) having been applied for 30 minutes shall not 

exceed:

(a) 0.5 times the value of the load cell verification 

interval (0.5 v) for Class I, II, III, and IIII load cells, or 

(b) 1.5 times the value of the load cell verification 

interval (1.5 v) for Class III L load cells. 

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2.20. UR.3.7. Minimum Load on a Vehicle Scale A vehicle scale shall not be used to weigh net loads smaller than: 

(a) 10 d when weighing scrap material for recycling or 

weighing refuse materials at landfills and transfer stations; 

(b) 50 d for all other weighing. 

As used in this paragraph, scrap materials for recycling shall be limited to ferrous metals, paper (including cardboard), textiles, plastic, and glass. 

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(Applicable to All Equipment Effective January 1, 2007) 

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2.21. Belt-Conveyor Scale Systems 

N.1.1. Official Test An official test of a belt-conveyor scale system shall 

include tests specified in N.3.1. Zero Load Tests, N.3.2. Material Tests, and, if applicable, N.3.3. Simulated Load Tests. 

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3.30. Liquid-Measuring Devices 

S.1.2. Units A liquid-measuring device shall indicate, and record if the 

device is equipped to record, its deliveries in liters, gallons, quarts, pints, fluid ounces, or binary-submultiples or 

decimal subdivisions of the liter or gallon. 

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3.30. S.2.2. Provision for Sealing Provision shall be made for an approved means of security 

(e.g., data change audit trail) or physical seal that must be broken before an adjustment or interchange can be made of any (a) measuring element or indicating element, (b) adjustable element that controls the delivery rate that affects accuracy, and (c) metrological parameter that will affect the metrological integrity of the device or system. When applicable, the adjusting mechanism shall be readily accessible for affixing a security seal. 

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NIST Handbook 44 Codes Newly Adopted or Recently Modified 

(Applicable to All Equipment Effective January 1, 2007) 

Code Section Paragraph Requirement New o

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3.30. S.2.2. Table S.2.2. Categories of 

Device and Methods of Sealing 

Removes the January 1, 2005 sunset date and reinstates requirements for a Category 2 device and the corresponding acceptable method of sealing a Category 2 device. Table also specifies requirements for a Category 1 and Category 3 device and the corresponding method of sealing these devices. 

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3.31. Vehicle-Tank Meters 

S.1.1.3. Value of Smallest Unit The value of the smallest unit of indicated delivery, and 

recorded delivery if the meter is equipped to record, shall not exceed the equivalent of: 

(a) 0.5 L (0.1 gal) or 0.5 kg (1 lb) on milk-metering 

systems, 

(b) 0.5 L (0.1 gal) on meters with a rated maximum 

flow rate of 750 L/min (200 gal/min) or less, 

(c) 5 L (1 gal) on meters with a rated maximum 

flow of 375 L/min (100 gal/min) or more used for jet fuel aviation refueling systems, or 

(d) 5 L (1 gal) on other meters. 

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(Applicable to All Equipment Effective January 1, 2007) 

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3.31. S.2.2. Provision for Sealing Provision shall be made for an approved means of security 

(e.g., data change audit trail) or physical seal that must be broken before a change, adjustment, or interchange can 

be made of any (a) measuring element or indicating element, (b) adjustable element that controls the delivery rate that affects accuracy, and (c) metrological parameter that will affect the metrological integrity of the device or system. When applicable, the adjusting mechanism shall be readily accessible for affixing a security seal. 

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3.31. Table S.2.2. Categories of Device and 

Methods of Sealing 

Table S.2.2. specifies requirements for a Category 1, 2, and 3 device and the corresponding method of sealing those devices that apply to vehicle-tank meter applications. 

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NIST Handbook 44 Codes Newly Adopted or Recently Modified 

(Applicable to All Equipment Effective January 1, 2007) 

Code Section Paragraph Requirement New o

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3.32. Liquefied Petroleum Gas and Anhydrous Ammonia LiquidMeasuring Devices 

S.2.2. Provision for Sealing Provision shall be made for an approved means of security 

(e.g., data change audit rail) or physical security seal must 

be broken before an adjustment or interchange can be made of any (a) measuring element or indicating element, (b) adjustable element that controls the delivery rate that affects accuracy, and (c) metrological parameter that will affect the metrological integrity of the device or system. When applicable, the adjusting mechanism shall be readily accessible for affixing a security seal. 

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3.32. Table S.2.2. Categories of Device and 

Methods of Sealing 

Table S.2.2. specifies requirements for a Category 1, 2, and 3 device and the corresponding method of sealing those devices that apply to liquefied petroleum gas and anhydrous ammonia liquid-measuring device applications. 

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3.34. Cryogenic Liquid-Measuring Devices 

S.2.5. Provision for Sealing Provision shall be made for an approved means of security 

(e.g., data change audit trail) or physical security seal must be broken before an adjustment or interchange can 

be made of any (a) measuring element or indicating element, (b) adjustable element that controls the delivery rate that affects accuracy, (c) automatic temperature or density compensating systems, and (d) metrological parameter that will affect the metrological integrity of the device or system. When applicable, the adjusting mechanism shall be readily accessible for affixing a security seal. 

Modifparagr
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NIST Handbook 44 Codes Newly Adopted or Recently Modified 

(Applicable to All Equipment Effective January 1, 2007) 

Code Section Paragraph Requirement New o

Req

3.34 Table S.2.5. Categories of Device and 

Methods of Sealing 

Table S.2.5. specifies requirements for a Category 1, 2, and 3 device and the corresponding method of sealing those devices that apply to cryogenic liquid-measuring device applications. 

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3.35. Milk Meters S.2.3. Provision for Sealing Provision shall be made for an approved means of security 

(e.g., data change audit trail) or physical security seal must be broken before an adjustment or interchange can 

be made of any (a) measuring element or indicating element, (b) adjustable element that controls the delivery rate that affects accuracy, and (c) metrological parameter that will affect the metrological integrity of the device or system. When applicable, the adjusting mechanism shall be readily accessible for affixing a security seal. 

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3.35. Table S.2.3. Categories of Device and 

Methods of Sealing 

Table S.2.3. specifies requirements for a Category 1, 2, and 3 device and the corresponding method of sealing those devices that apply to milk meter applications. 

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3.37 Mass Flow Meters 

S.3.5. Provision for Sealing Provision shall be made for an approved means of security 

(e.g., data change audit trail) or physical seal so that no adjustment or interchange can be made of any (a) measuring element or indicating element, (b) adjustable element that controls the delivery rate that affects 

accuracy, (c) the zero adjustment mechanism, and (d) metrological parameter that will affect the metrological integrity of the device or system. When applicable, the adjusting mechanism shall be readily accessible for affixing a security seal. 

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NIST Handbook 44 Codes Newly Adopted or Recently Modified 

(Applicable to All Equipment Effective January 1, 2007) 

Code Section Paragraph Requirement New o

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3.37. Table S.3.5. Categories of Device and 

Methods of Sealing 

Removes the January 1, 2005 sunset date and reinstates requirements for a Category 2 device and the corresponding acceptable method of sealing a Category 2 device. Table also specifies requirements for a Category 1 and Category 3 device and the corresponding method of sealing these devices. 

Modif

3.37. S.4.1. Diversion of Measured 

Product 

No means shall be provided by which any measured product can be diverted from the measuring instrument. However, two or more delivery outlets may be permanently installed and operated simultaneously, provided that any diversion of flow to other than the intended receiving receptacle cannot be readily accomplished or is readily apparent. Such means include physical barriers, visible valves, or indications that make it clear which outlets are in operation, and explanatory signs if deemed necessary. An outlet that may be opened for purging or draining the measuring system, or for recirculating product if recirculation is required in order to maintain the product in a deliverable state shall be permitted. Effective automatic means shall be provided to prevent the passage of liquid through any such outlet during normal operation of the measuring system and to inhibit meter indications (or advancement of indications) and recorded representations while the outlet is in operation. 

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3.38. Carbon Dioxide Liquid-Measuring Devices 

S.2.5. Provision for Sealing Provision shall be made for an approved means of security 

(e.g., data change audit trail) or physical security seal that must be broken before an adjustment or interchange can 

be made of any (a) measuring element or indicating element, (b) adjustable element that controls the delivery rate that affects accuracy, (c) automatic temperature or density compensating system, and (d) metrological parameter that will affect the metrological integrity of the device or system. When applicable, the adjusting mechanism shall be readily accessible for affixing a security seal. 

Modifparagr
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(Applicable to All Equipment Effective January 1, 2007) 

Code Section Paragraph Requirement New o

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3.38. Table S.2.5. Categories of Device and 

Methods of Sealing 

Table S.2.5. specifies requirements for a Category 1, 2, and 3 device and the corresponding method of sealing those devices that apply to carbon dioxide liquid-measuring device applications. 

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DefinitionsAppendix D Dmin (minimum load of the measuring range) The Dmin or minimum load of the measuring range is the smallest value of a quantity (mass) which is applied to a load 

cell during test or use. This value shall not be less than Emin.[2.20] 

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DefinitionsAppendix D Emin (minimum dead load) The Emin or minimum dead load is the smallest value of a quantity (mass) which may be applied to a load cell during test 

or use without exceeding the mpe.[2.20] 

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3.32. Liquefied Petroleum Gas and Anhydrous Ammonia LiquidMeasuring Devices 

S.4.3. Location of Marking Information; Retail Motor-Fuel Dispensers 

The marking information required in General Code, Paragraph G S.1. Identification shall appear as follows: 

(a) within 60 cm (24 in) to 150 cm (60 in) from the 

base of the dispenser; 

(b) either internally and/or externally provided the 

information is permanent and easily read; and 

(c) on a portion of the device that cannot be readily 

removed or interchanged (i.e., not on a service access panel). 

Note: The use of a dispenser key or tool to access internal marking information is permitted for retail motor-fuel dispensers. [Nonretroactive as of January 1, 2003] 

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3.37. Mass Flow Meters 

S.5.1. Location of Marking Information; Retail Motor-Fuel Dispensers 

The marking information required in General Code, Paragraph G S.1. Identification shall appear as follows: 

(a) within 60 cm (24 in) to 150 cm (60 in) from the 

base of the dispenser; 

(b) either internally and/or externally provided the 

information is permanent and easily read; and 

(c) on a portion of the device that cannot be readily 

removed or interchanged (i.e., not on a service access panel). 

Note: The use of a dispenser key or tool to access internal marking information is permitted for retail motor-fuel dispensers. [Nonretroactive as of January 1, 2003] 

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