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U.S. National Work Group for the

Development of Commercial Hydrogen Measurement Standards

October 12, 2011

Joint Device Standards Subcommittee (DSS) and Fuel Specifications Subcommittee (FSS)

Tele/Web Conference Meeting

MEETING SUMMARY

Time: Wednesday, October 12, 2011/1:00 p.m. – 2:30 p.m. EDT-USA & Canada (GMT - 05:00)

Meeting Name: H2 U.S. National Work Group, October 12, 2011

This meeting was sponsored by the U.S. Department of Energy and U.S. Department of Commerce's National 

Institute of Standards and Technology.

Purpose: The U.S. National Work Group (USNWG) met to continue its work to promote the establishment of a 

comprehensive set of (1) design, accuracy, installation, use, and method of sale requirements; (2) test procedures;

and (3) quality standards for hydrogen fuel and equipment used in hydrogen measurements for vehicle and other 

refueling applications. 

AGENDA ITEMS

Attachment List – Appendices A-C ..............................................................................................................2

Glossary of Acronyms...................................................................................................................................2

(1) Welcome Current/New Members and Roll Call.....................................................................................3

(2) Administrative Business .........................................................................................................................3

(a) Agenda Updates for October 2011...................................................................................................3

(3) FSS Items - Development of Quality Standards and Definitions for Commercial Hydrogen Fuel

(a) Report on the September 27, 2011, E-mail Ballot Results and Discussion on the Wording of the 

Proposed Definitions for Hydrogen Fuel for Internal Combustion Engines and Fuel Cell 

Vehicles............................................................................................................................................3

(b) Proposed Joint Statement from the USNWG in Support of the NCWM Hydrogen Fuel

Specification Agenda Items..............................................................................................................6

(4) DSS Items - Development of Device Standards and Test Procedures for Commercial Hydrogen 

Measurement...........................................................................................................................................6

(a) Review and Approve Proposed Checklist for Addition to NCWM Publication 14 .........................6

(b) Progress Report on the Development of Hydrogen Test Methods and Gap Analysis......................7

(5) Next Steps/Tasks.....................................................................................................................................7

(6) Next Meeting ..........................................................................................................................................8
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Attachments List

Appendix

Related

Agenda

Item(s)

Title Page

A** (5) Proposal to SWMA on the Development of Quality 

Standards and Definitions for Commercial Hydrogen Fuel 9

B* (4) (a) Hydrogen Checklist forwarded by the Measuring Sector to 

the NCWM NTEP Committee 12

C (1) Attendee List – October 12, 2011 USNWG Meeting 28

*Device Standards Subcommittee (DSS)

**Fuel Specifications Subcommittee (FSS)

Glossary of Acronyms

ASTM American Society of Testing and 

Materials International NCWM National Conference on Weights and Measures

CaFCP California Fuel Cell Partnership NGV Natural Gas Vehicle

CDFA 

DMS 

(CADMS)

California Department of Food and 

Agriculture, Division of Measurement 

Standards

NIST National Institute of Standards and 

Technology

CSA Canadian Standards Association, 

Incorporated NTETC National Type Evaluation Technical Committee

DSS Device Standards Subcommittee NTP Normal Temperature and Pressure

EPO 29

Draft Hydrogen Gas Retail Motor-Fuel 

Dispenser Examination Procedure 

Outline (EPO) 29

OEM Original Equipment Manufacturer

FSS Fuel Specifications Subcommittee OIML International Organization of Legal 

Metrology

HB 44

NIST Handbook 44, Specifications, 

Tolerances, and Other Technical 

Requirements for Weighing and 

Measuring Devices

OIML R 

139

Recommendation for Compressed gaseous 

fuel measuring systems for vehicles

HB 130

NIST Handbook 130, Uniform Laws 

and Regulations in the Area of Legal 

Metrology and Engine Fuel Quality

OWM Office of Weights and Measures (NIST)

HGV Hydrogen Gas Vehicle RMFD Retail Motor-Fuel Dispenser

ISO International Organization for 

Standardization SAE Society of Automotive Engineers

MMQ Minimum Measured Quantity SI International System of Units

MOS Method of Sale SWMA Southern Weights and Measures Assn.

MPa megapascal USNWG U.S. National Work Group

NEWMA Northeastern Weights and Measures 

Association WWMA Western Weights and Measures Assn.

This table is meant to assist the reader in the identification of acronyms used in this agenda and does not 

imply that these terms are used solely to identify these organizations or technical topics. 
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DISCUSSION AND DECISIONS ON AGENDA TOPICS

1:00 P.M. (EDT) 

(1) Welcome Current/New Members and Roll Call

New members of the USNWG and visitors were welcomed and the meeting was called to order. After roll call

(see Appendix C), the meeting's purpose was reviewed.

(2) Administrative Business

(a) Agenda Updates for October 2011

The USNWG discussed the agenda for the meeting and no additions or changes to the agenda were proposed.

(3) FSS Items - Development of Quality Standards and Definitions for Commercial Hydrogen Fuel

(a) Report on the September 27, 2011, E-mail Ballot Results and Discussion on the Wording of the 

Proposed Definitions for Hydrogen Fuel, Internal Combustion Engine, and Fuel Cell

Marc Buttler (NIST OWM) reported on the results of the September 27, 2011, e-mail ballot proposing to amend

the three hydrogen related definitions the USNWG recommended be added to NIST Handbook 130 – “Uniform 

Engine Fuels and Automotive Lubricants Regulation,” Section 2. Standard Fuel Specifications.

The results were reported as:

* Pending confirmation of Inter-laboratory Comparisons.

** “I prefer the original version, but defer to the fuel experts if they approve the changes.”

The ballot had proposed the following updates for the USNWG to consider:

• Revise the language in the proposed definition of “Fuel Cell” to harmonize with the language in 

SAE J2574.

• Revise the language in the proposed definitions for both “Hydrogen Fuel” and “Internal Combustion 

Engine” as proposed in comments received at the July 2011 National Conference on Weights and 

Measures.

At the conclusion of its October 12, 2011, meeting, after further modifications to the definitions, the USNWG 

agreed to recommend to the January 2012 NCWM, alternative definitions move forward for a vote in July 2012 to

read:

1.XX. Fuel Cell. – An electrochemical energy conversion device in which fuel and an oxidant react to 

generate electricity without any consumption, physically or chemically, of its electrodes or electrolyte. 

(Added 201X) 

Approve: 9

Conditional* Approval: 1

Oppose**: 1

Abstain: 1
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1.XX. Hydrogen Fuel. – A fuel composed of molecular hydrogen intended for consumption in a surface 

vehicle or electricity production device with an internal combustion engine or fuel cell. 

(Added 201X) 

1.XX. Internal Combustion Engine. – A device used to generate power by converting chemical energy 

bound in the fuel via spark-ignition or compression ignition combustion into mechanical work to power a 

vehicle or other device. 

(Added 201X). 

Background

On August 4, 2011, a summary of the changes to the definitions of hydrogen fuel, internal combustion engine, 

and fuel cell proposed in July 2011 by Jim McGetrick (BP America) was distributed to the USNWG for their 

consideration and comment. The proposal resulted in the voting status of the definition being downgraded to an 

information item and carried over to the 2012 NCWM agenda.

The proposal did not alter the status of the corresponding information item, which is a proposal for a new 

hydrogen fuel specification still under development in the fuel standards community. The July 2011 alternate

proposal for defining all three hydrogen related terms read:

1.XX Fuel Cell. – An electrochemical energy conversion device in which fuel and an oxidant react to 

generate ELECTRICAL energy without consumption of its electrodes or electrolytes.

(Added 201X)

1.XX. Hydrogen Fuel. – A fuel composed of the chemical MOLECULAR hydrogen intended for

consumption in a surface vehicle OR ELECTRICITY PRODUCTION DEVICE with an internal combustion 

engine or fuel cell. 

(Added 201X)

1.XX. Internal Combustion Engine. – A device used to generate power by converting chemical energy 

bound in the fuel VIA SPARK-IGNITION OR COMPRESSION IGNITION COMBUSTION into 

mechanical work to power a vehicle OR OTHER DEVICE. 

(Added 201X)

On September 6, 2011, the NIST Technical Advisors to the USNWG held a teleconference with James McGetrick 

and Dr. James Simnick (BP America), the developers of the July 2011 alternate proposal shown above. The 

teleconference was held to: (1) clarify the nature of their comments (technical, editorial, etc.); (2) ensure any 

suggested alternate language does not result in any omission or exclusion of any intended applications; and (3) 

possibly respond to any questions about the USNWG’s proposals. The submitters indicated their comments on 

the fuel quality standard proposal were meant to encourage academia and industry to fully vet the values for the 

maximum constituent levels before proceeding further; to avoid adoption of excessively stringent requirements. 

The suggested alternate language for the definitions, although technical in nature, was primarily intended to 

further clarify the meaning of the terms and, ultimately, not critical to their meaning. The Technical Advisors 

provided a history of: (1) the work by the USNWG; (2) the ongoing work by its members on various fuel 

quality standards committees such as ASTM, SAE, and ISO; and (3) the group’s goal to recommend a nationally 

and internationally accepted specification developed by a recognize standard’s body.

On September 7, 2011, Jackie Birdsall (CaFCP) recommended the USNWG consider the alternate definition for 

fuel cell in SAE J2574 Information Report Fuel Cell Electric Vehicle Terminology (NOTE: SAE J2574 was 

published on September 6, 2011) that would modify the proposed definition to read:

 
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1.XX Fuel Cell. – An electrochemical energy conversion device in which fuel and an oxidant react to 

generate ELECTRICITY without ANY consumption, PHYSICALY OR CHEMICALLY, of its electrodes or 

electrolyte.

The USNWG was balloted by e-mail on September 20, 2011, and then by an amended ballot on September 27, 

2011. The SAE J2574 definition for fuel cell and the alternate definitions for hydrogen fuel and internal 

combustion engine that were proposed in July 2011 were all distributed in the September 27 ballot for the 

USNWG’s review, comment, and vote and in preparation for the group’s October 12, 2011, meeting.

On September 25 - 29, 2011, the Western Weights and Measures Association (WWMA) met and considered 

NCWM carryover Items 237-1 (Engine Fuel Quality Requirements for Hydrogen) and 237-2 (Definitions for 

Hydrogen Fuel for Internal Combustion Engines and Fuel Cell Vehicles). The proposed definitions in agenda

Item 237-2 included all of the alternate language recommended by the October 2011 USNWG. DSS Chair,

Kristin Macey (CA DMS), reported to the USNWG that the WWMA voted unanimously to move the items 

forward as voting items to the 2012 NCWM. The USNWG acknowledges and thanks Chair Macey for 

representing the work of the group at the WWMA meeting.

The USNWG wishes to express its appreciation to Bill Collins of UTC Power who presented a history on the 

development of SAE J2719 at the October 2011 NEWMA regional association interim meeting. This information 

was intended to aid the NEWMA L&R Committee in completing their technical analysis of carryover Items 237-1 

and 237-2. NEWMA supported Item 237-1 as an informational item and Item 237-2 as a voting item.

October 2011 Discussions

During its October 12, 2011, meeting, the USNWG addressed multiple questions about its hydrogen fuel quality 

standard proposal. The USNWG had a question regarding what was intended by the latest proposal to add the 

text “electricity production device” to the definition of Hydrogen Fuel. Marc Buttler explained that this is 

generally in reference to the increased use of fuel cells in stationary electrical power generation applications and 

Joe Cohen added that cell towers is one very specific application.

Jim Ohi (Consultant DOE) had a question about whether the definition for Hydrogen Fuel, as proposed would be 

exclusively for gaseous fuels. FSS Chair Bob Boyd (Boyd Hydrogen, LLC) explained that the proposed new 

terminology, including the word “molecular” could encompass both gaseous and liquid retail sales of hydrogen 

fuel. Furthermore, Mr. Boyd stated that he is not opposed to the use of the word molecular in this instance. The 

calculations referenced in NIST Handbook 44 Section 3.39. Hydrogen Gas-Measuring Devices – Tentative Code 

in paragraph N.7. Density encompass the thermophysical properties of gaseous and liquid hydrogen. No 

comments were received in opposition to the term “molecular” on a technical basis.

The USNWG members present supported the results of the e-mail ballot with general consensus in favor of 

revising the proposal to include the latest modifications as shown above.

Juana Williams (NIST OWM) pointed out that Paragraph 2.32.1. Definitions for Hydrogen Fuel from the 

“Uniform Regulation for the Method of Sale (MOS) of Commodities” section of NIST Handbook 130 should also 

be updated so that both the MOS and the fuel specifications sections of HB 130 will have the same definition of 

hydrogen fuel. Marc Buttler will propose this amendment to L&R Committee Item 237-2 (Definitions for 

Hydrogen Fuel for Internal Combustion Engines and Fuel Cell Vehicles) at the SWMA meeting in Norfolk, 

Virginia, on October 23 - 26, 2011.
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(b) Proposed Joint Statement from the USNWG in Support of the NCWM Hydrogen Fuel Specification

Agenda Items

During the USNWG’s October 2011 discussion of its position statement for Item 237-1 (Engine Fuel Quality 

Requirements for Hydrogen), the FSS Chair, Bob Boyd, proposed replacing the table that had been developed 

with a direct reference to SAE J2719. This proposal was made with the understanding that the publication of 

SAE J2719 was imminent and that direct reference to the standard is now possible. Both Jackie Birdsall and Jim 

Ohi supported the proposal. Jim Ohi stated that this change “reduces future confusion.” A direct reference to the 

SAE standard is also in line with the precedence set by citing other fuels specifications already in HB 130. There 

was general consensus in support of this alternative proposal among the USNWG members present. The 

USNWG’s new alternative fuel specification proposal was developed to replace Table 1 and reads:

2.X. Hydrogen Fuel. – Shall meet the most recent version of SAE J2719, “Hydrogen Fuel Quality for 

Fuel Cell Vehicles.”

The USNWG has monitored the national and international work to develop a fuel specification to avoid 

redundancy and encourage harmonization of the standard. The permissible constituent values in SAE J2719 and 

ISO/DIS 14687-2 “Hydrogen Fuel - Product Specification - Part 2 PEM Fuel Cell Applications for Road Vehicles” 

are reported to be identical and were also reflected in Table 1. The USNWG’s Table 1 was an interim measure 

and more suited to the group’s work as it monitored the ongoing progress to develop a hydrogen fuel standard.

Juana Williams mentioned during the USNWG meeting that the NCWM process includes the opportunity for 

comments during both open hearings and voting session, up until the actual vote on an item occurs. The group 

discussed what to do if changes to items developed by the USNWG are proposed and amended during the 

NCWM; however, the group did not reach a firm conclusion other than to submit its most recent alternative 

proposals to the NCWM with a strong recommendation to adopt them as submitted. 

(4) DSS Items - Development of Device Standards and Test Procedures for Commercial Hydrogen 

Measurement

(a) Review and Approve Proposed Checklist for Addition to NCWM Publication 14 

Kristin Macey reported that CADMS has used the draft checklist to conduct multiple inspections and during one 

type evaluation. Michael Keilty (Endress & Hauser), leader of the NCWM group that developed the draft 

checklist, added that the draft was patterned after those used for gasoline and CNG dispensers. Tina Butcher

(NIST OWM) pointed out that the checklist is a reflection of requirements that the USNWG developed in their 

recommendation for the hydrogen device code that was adopted during the 2010 NCWM and subsequently 

published in the 2011 NIST HB 44 as Section 3.39. Hydrogen Gas-Measuring Devices – Tentative Code and, 

therefore, the checklist does not introduce any new requirements beyond what are already found in HB 44.

The group voted on the draft checklist (see Appendix B) with no changes and three votes in support were heard. 

However, four other USNWG members abstained and requested more time to complete a thorough review of the 

checklist. Following the meeting, one of the abstentions contacted Marc Buttler to change their vote in favor and 

another sent comments, but did not specify that their review was completed or position established. At this time, 

no requests were made to delay the NCWM’s approval of the checklist. Future comments by any stakeholder can 

be submitted to the NCWM NTEP administrator (jim.truex@ncwm.com) and should be copied to Marc Buttler 

(marc.buttler@nist.gov) for distribution to the entire USNWG.
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(b) Progress Report on the Development of Hydrogen Test Methods and Gap Analysis

Marc Buttler updated the USNWG on NIST efforts to develop and validate Examination Procedure Outlines 

(EPOs) for the three test methods recognized in NIST Handbook 44 (gravimetric, master meter, and PVT). 

Members of the USNWG are asked to contact Marc as they become aware of any opportunities to witness any 

progress being made in the development of test methods that should be considered for validation and 

documentation as a NIST EPO.

(5) Next Steps/Tasks

The following action items were taken by the FSS Technical Advisor in an effort to meet USNWG goals for the

adoption of a uniform hydrogen fuel quality standard. 

Status of SAE J2719

Marc Buttler confirmed that after a meeting with the Chair of the SAE work group on J2719 (Mike Steele), the

title of J2719, as stated in the language developed during the discussion of agenda item (3) (b), was correct and up 

to date with the version to be published. Furthermore, FSS Technical Advisor Buttler confirmed in October 2011

that publication had taken place and that SAE J2719 is available for purchase.

The Weights and Measures Standards Development Process

FSS Technical Advisor Buttler prepared a statement summarizing all FSS decisions made on the 

October 2011 USNWG agenda items (3)(a) and (3)(b) to update the SWMA regional association at their 

annual meeting in Norfolk, Virginia, on October 23 - 26, 2011. This statement can be found in 

Appendix A of this meeting summary. The statement was delivered and considered by the SWMA. The

SWMA voted to adopt all the alternative changes proposed by the USNWG and move both items 

forward as voting items (as revised) to the NCWM.

Development of the Type Evaluation Checklist

During their annual meeting that was held October 21 - 22, 2011, in Norfolk Virginia, the NCWM NTETC 

Measuring Sector also reviewed the checklist (see discussions in Agenda Item (4) (a)) and voted to move it 

forward to the January 2012 NCWM NTEP Committee for inclusion in NCWM Publication 14. The 

recommendation from the Measuring Sector adds a new note to the beginning of the hydrogen checklist that 

directs readers to Section I. Field Evaluation and Permanence Tests for Mass Flow Meters of Publication 14 for 

guidance on compressed gas test methods and permanence tests, and thereby establishes an identical set of 

requirements for product throughput and time for permanence examination as those already in use for CNG 

measuring devices. The note reads as follows:

Note: Refer to Section I Field Evaluation and Permanence Tests for Mass Flow Meters (All topics with 

the exception of “Testing for Volume Units Only or to Add Volume Units to Existing Certificates”) for 

test procedures.

Technical Advisor’s Note: During its annual meeting, the Measuring Sector also voted in favor of two other 

items related to type approval of hydrogen gas-measuring devices. The first item was to recognize hydrogen in 

the list of product categories for meters in Technical Policy C. This policy specifies the test procedures that must 

be conducted on a device before a device can be approved for use in a single or multiple product application(s). 

The second item adds the “kilogram” (kg) as an approved unit of measurement that can be displayed on a retail 

fueling dispenser’s indications when the device is used to deliver hydrogen. 
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The NCWM NTEP Committee will consider the recommendation from the Measuring Sector to add the checklist 

to NCWM Publication 14 for Measuring Devices. Marc Buttler will also forward any comments from the 

USNWG on the draft checklist that are received prior to the January 2012 final review of the draft by the NCWM 

NTEP Committee for the Committee’s consideration, along with the Measuring Sector’s recommendation.

(6) Next Meeting

The group agreed to schedule future meetings on an “as needed” basis as we approach the next annual NCWM in 

July, 2012.
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APPENDIX A: Proposal Delivered to Annual Meeting of the Southern Weights and 

Measures Association (SWMA)

Proposed New Hydrogen Fuel Quality Specification and Definitions for NIST Handbook 130 

October 19, 2011

The earlier proposed hydrogen fuel quality specification and related definitions were before the July 2011 National 

Conference on Weights and Measures and were carried over to 2012 as informational items.

On October 12, 2011, the U.S. National Work Group (USNWG) for the Development of Commercial Hydrogen 

Measurement Standards considered and approved the following changes to the items carried over from the 2011 NCWM to 

adopt new fuel quality requirements and related definitions for NIST Handbook 130 (HB 130) to address gaseous hydrogen 

refueling applications.

237-1 I HB 130, Engine Fuel Quality Requirements for Hydrogen

Source: Western Weights and Measures Association (WWMA)

Purpose: Adopt engine fuel quality requirements for hydrogen in HB 130 to address gaseous hydrogen refueling 

applications. 

Item Under Consideration: In April 2009, the U.S. National Work Group (USNWG) for the Development of Commercial 

Hydrogen Measurement Standards Fuel Specifications Subcommittee (FSS) presented the original recommended fuel quality 

standard for consideration.

The U.S. National Work Group (USNWG) Fuel Specifications Subcommittee (FSS) presents the following updated 

recommendation for consideration to be added to NIST Handbook 130 – IV. Uniform Regulations - G. Uniform Engine 

Fuels and Automotive Lubricants Regulation, Section 2. Standard Fuel Specifications.

Specification for Hydrogen Fuel: The FSS has been notified that publication of the SAE standard J2719 is imminent. The 

document has been approved by SAE for publication and is currently being prepared by the publisher for an expected release 

before the end of September 2011. In light of this development, the USNWG now recommends replacing the previously 

recommended table with the following quality standard by direct reference:

2.X. Hydrogen Fuel. – Shall meet the most recent version of SAE J2719, “Hydrogen Fuel Quality for Fuel Cell Vehicles.”

This fuel quality standard for hydrogen by direct reference to SAE standard J2719 is proposed to replace entirely the previous 

table below that had been developed by the USNWG to reflect the constituents, maximum allowable levels, and 

corresponding ASTM test methods. The USNWG had developed the table to be harmonized with the developing SAE J2719 

standard. Now that SAE J2719 has been approved for publication, a NIST Handbook 130 standard by direct reference to 

SAE J2719 is preferred by the FSS to facilitate continued harmonization with the SAE standard and to reflect the precedence 

of directly referencing SAE and ASTM standards that is set by other fuel quality standards found in Section 2. Standard 

Fuel Specifications (e.g., Gasoline and Gasoline-Oxygenated Blends, Diesel Fuel, Aviation Turbine Fuels, LPG, CNG, etc.).

Table 1. Hydrogen Fuel Quality Specification appears as follows:

Table 1. Hydrogen Fuel Quality Specification*

Constituent Value Unit Limit Test Method(s)

Responsible Standards 

Committee and 

Status of test method

Standard Practice for Gaseous Sampling ASTM D7606-11

1 Hydrogen Fuel Index 99.97 % Minimum (a)

2

Total Allowable NonHydrogen, Non100.0 ppm v/v Maximum (b)
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The USNWG supports the addition of the single sentence direct reference to SAE J2719 above to NIST Handbook 130 for 

the purpose of meeting the need in the market place for uniformity in hydrogen fuel quality, conditional on the expected and 

imminent publication of the SAE J2719 standard. The USNWG acknowledges that, if the final SAE J2719 standard is still 

pending publication in July 2012, the NCWM L&R committee may downgrade the proposal’s status and carryover the item 

to the 2013 NCWM agenda.”

The USNWG will continue to accept input and work on this item as needed until the NCWM interim meeting in January.

237-2 I HB 130, Definitions for Hydrogen Fuel for Internal Combustion Engines and Fuel Cell 

Vehicles

Source: Western Weights and Measures Association (WWMA). This item was previously within Item 237-1. 

Purpose: Adopt definitions for hydrogen fuel, internal combustion engine, and fuel cell.

Helium, 

Non-Particulate

3

Total Non-Hydrogen 

Gases 300.0 ppm v/v Maximum (c)

4 Ammonia 0.1 ppm v/v Maximum ASTM D7653-10

5 Carbon Dioxide 2.0 ppm v/v Maximum ASTM D7653-10

ASTM D7649-10

6 Carbon Monoxide 0.2 ppm v/v Maximum ASTM D7653-10

7 Formaldehyde 0.01 ppm v/v Maximum ASTM D7653-10

8 Formic Acid 0.2 ppm v/v Maximum ASTM D7550-09

ASTM D7653-10

9 Helium 300.0 ppm v/v Maximum ASTM D1945-03

10 Nitrogen and Argon 100.0 ppm v/v Maximum ASTM D7649-10

11 Oxygen 5.0 ppm v/v Maximum ASTM D7649-10

12 Particulate 

Concentration 1.0 mg/kg Maximum ASTM D7650-10ASTM D7651-10

13 Total Halogenated 

Compounds 0.05 ppm v/v Maximum to be specified WK 23815 under ASTM D03.14

14 Total Hydrocarbons 2.0 (d) ppm v/v Maximum ASTM D7675-11

15 Total Sulfur 

Compounds 0.004 ppm v/v Maximum ASTM D7652-11

16 Water 5.0 ppm v/v Maximum ASTM D7653-10

ASTM D7649-10

Footnotes to Table 1 –

(a) Hydrogen fuel index = Sum of all non-hydrogen gases (as % of sample) subtracted from 100 %.

(b) Total Allowable Non-Hydrogen, Non-Helium, Non-Particulate = Sum of all constituents listed on the table, except 

hydrogen, helium, and particulates.

(c) Total Non-Hydrogen Gases = Sum of all constituents listed on the table except hydrogen and particulates. 

(d) Total Hydrocarbons may exceed 2 ppm v/v only due to the presence of methane, provided that the total gases 

do not exceed 300 ppm v/v.

* The FTC’s Fuel Rating Rule (16 CFR Part 309-see the requirements in “Labeling of Alternative Fuels” at 

http://www.ftc.gov/bcp/edu/pubs/business/autos/bus29.shtm) requires dispensers to bear a declaration of the minimum 

percent of hydrogen determined according to test methods described in “Standard Test Method for Analysis of Natural Gas 

by Gas Chromatography (ASTM D1946).

Updated 7/12/2011
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Item Under Consideration: In April 2009, the U.S. National Work Group (USNWG) for the Development of Commercial 

Hydrogen Measurement Standards Fuel Specifications Subcommittee (FSS) presented the original recommended definitions 

for consideration.

The U.S. National Work Group (USNWG) Fuel Specifications Subcommittee (FSS) presents the following updated 

recommendation for consideration to be added to NIST Handbook 130 – IV. Uniform Regulations - G. Uniform Engine 

Fuels and Automotive Lubricants Regulation, Section 1. Definitions.

FSS supports the proposed new definitions below to address gaseous hydrogen refueling applications.

The following updates were proposed for the USNWG to consider after the July NCWM:

 Revise the language of the definition of “Fuel Cell” to harmonize with the language in SAE J2574 (see below).

 Revise the language of the definitions for both “Hydrogen Fuel” and “Internal Combustion Engine” as proposed (see 

below) in comments received at the July 2011 National Conference on Weights and Measures.

The information regarding the changes to the definitions was first provided to the USNWG on August 4 following the July 

NCWM. A ballot was issued via e-mail on September 20 to formally approve the definition modifications in time for the 

September 26 - 29 WWMA. The updates below were unanimously recommended to move forward at the WWMA as a 

voting item.

The USNWG held a meeting on October 12, 2011, to allow for further discussion. Final approval of the update was 

confirmed during this meeting.

 

The definitions appear with the proposed changes as follows: 

1.XX. Fuel Cell. – An electrochemical energy conversion device in which fuel and an oxidant react to generate 

energy electricity without any consumption, physically or chemically, of its electrodes or electrolytes. 

(Added 201X) 

1.XX. Hydrogen Fuel. – A fuel composed of the chemical molecular hydrogen intended for consumption in a 

surface vehicle or electricity production device with an internal combustion engine or fuel cell. 

(Added 201X) 

1.XX. Internal Combustion Engine. – A device used to generate power by converting chemical energy bound in 

the fuel via spark-ignition or compression ignition combustion into mechanical work to power a vehicle or other 

device. 

(Added 201X) 

In addition, it is proposed that the scope of Item 237-2 be expanded to include the following revision to NIST Handbook 

130 – IV. Uniform Regulations - B. Uniform Regulation for the Method of Sale of Commodities, Section 2. Non-food 

Products, Paragraph 2.32.1. Definitions for Hydrogen Fuel. as follows:

2.32.1. Definitions for Hydrogen Fuel. – A fuel composed of the chemical molecular hydrogen intended for consumption 

in a surface vehicle or electricity production device with an internal combustion engine or fuel cell.

The purpose of adding this change to the Method of Sale Regulation is to avoid confusion and maintain consistency between 

the definitions of Hydrogen Fuel found in the two sections of NIST Handbook 130 –IV. Uniform Regulations (i.e., the 

Method of Sale Regulation and the Engine Fuels and Automotive Lubricants Regulation).

The USNWG will continue to accept input and work on this item as needed until the NCWM interim meeting in January.
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Appendix B: Checklist as Forwarded by Measuring Sector following the Sector’s 

October 21 - 22, 2011, Annual Meeting

National Type Evaluation Program

Liquid Measuring Devices – Additional Checklists and Test Procedures

for Hydrogen Gas-Measuring Devices

Additional Checklists and Test Procedures for Hydrogen Gas-Measuring Devices

Note: Refer to Section I Field Evaluation and Permanence Tests for Mass Flow Meters (All topics with the 

exception of “Testing for Volume Units Only or to Add Volume Units to Existing Certificates”) for 

test procedures.

47. Indicating Elements, Recording Elements, and Recorded Representations

Code Reference: S.1.1. Indicating Elements 

47.1. A device shall be equipped with a primary indicating element that continuously 

displays measurement results relative to quantity and total price.

Yes No N/A

Is the device equipped with a primary recording element? Yes No N/A

Code Reference: S.1.2. Vehicle Fuel Dispensers

Dispensers used to fuel vehicles shall be of the computing type and shall indicate the mass, 

the unit price, and the total price of each delivery.

Yes No N/A

Code Reference: S.1.1. Indicating Elements, S.2. Operating Requirements

Primary indicating and recording elements may advance only as a result of the operation 

of the device. However, means shall be provided for readily returning the device to zero. 

Once the zeroing operation has begun, it shall not be possible to return primary indicating 

elements or primary recording elements beyond the correct zero position. It shall not be 

possible to indicate a value other than the latest measurement, or “zeros” when the 

zeroing operation has been completed.

Indicating and recording elements shall advance only by the operation of the device (except 

for clearing the device to zero).

Yes No N/A

During the reset operation, it shall not be possible to return primary indicating elements or 

primary recording elements to any value other than zero. 

Yes No N/A

During the reset operation, it shall not be possible to indicate a value other than the latest 

measurement, or “zeros” when the zeroing operation has been completed.

Yes No N/A

Code Reference: G-S.5.1. Indicating and Recording Elements - General

Indicating elements must be appropriately designed and adequate in amount. Specifically, a device must have sufficient 

display capacity to indicate the quantities and total prices, if it applies in the normal encountered specific application. 

Electronic devices shall either have sufficient display capacity to indicate the normal quantities and money values or 

automatically stop the delivery before exceeding the display capacity of either the quantity or total price. This 

consideration may apply when evaluating a system that may be used in either a truck stop or an automobile service 

station.

47.7. An electronic digital indicating element shall either:

47.7.1. Have adequate display capacity for the application, OR Yes No N/A

47.7.2. Automatically stop the delivery before exceeding the maximum quantity or Yes No N/A
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maximum total price that can be indicated.

Code Reference: G-S.7. Lettering

47.8. All required markings and instructions shall be distinct and easily readable and shall be 

of such character that they will not tend to become obliterated or illegible.

Yes No N/A

Code Reference: G-S.5.2.4. and S.1.3.4. Values Defined

Values shall be adequately defined by a sufficient number of figures, words, or combinations 

to include a zero display for all displayed digits to the right of the decimal mark and at 

least one to the left.

Yes No N/A

Code Reference: G-S.5.2.2; Digital Indication and Representation; S.2.4.4. Agreement Between Indications

Basic operating requirements for devices are that:

All digital values of like value in a system shall agree.

Digital values shall round off to the nearest digital division that can be indicated or recorded.

When a digital zero display is provided, the zero indication shall consist of at least one digit to the left and all digits to 

the right of the decimal point.

For those systems consisting of a console and dispensers and equipped with pre-set quantity, the dispenser must deliver 

at least the pre-set quantity; it cannot deliver less. For example, if the console sends only the money equivalent of the 

pre-set volume to the dispenser, the dispenser shall deliver at least the pre-set quantity. It may not stop at the first 

quantity amount that will result in mathematical agreement with the money value equivalent of the pre-set quantity if 

the quantity indication is less than the pre-set quantity. Similarly, if a money value is pre-set, the dispenser is not 

properly designed if it always stops at the lowest quantity value that provides mathematical agreement with the pre-set 

money value.

Tests for agreement of digital values shall be performed in the post pay, prepay money, pre-set quantity modes, and 

power loss. Agreement should be checked at several unit prices including the maximum unit price and with the 

dispenser operating at its maximum flow rate.

47.10.Digital quantity indications must agree. Yes No N/A

47.11.Manual quantity entries in invoice billing systems must be identified as such. Yes No N/A

47.12.When delivery from a computing device is based upon a pre-set quantity, the quantity 

indicated on the dispenser and any auxiliary device must be equal to or greater than the 

pre-set quantity at the conclusion of the transaction.

Yes No N/A

Code Reference: G-S.5.5. Money Values, Mathematical Agreement

47.13.All total sale money value indications in a computing system are primary indications 

and must agree.

Yes No N/A

47.11.Any recorded money-value and any digital money-value indication on a computing –

type measuring device used in retail trade shall be in mathematical agreement with its 

associated quantity representation or indication to the nearest 1 cent of money value. 

(e.g., within each element, the values indicated or recorded must meet the formula)

Yes No N/A

47.15.The printed ticket and dispenser money values shall be in mathematical agreement to 

the nearest cent.

Yes No N/A

47.16.The quantity, unit price, and total price indications on the console shall be in 

mathematical agreement with the dispenser and printed ticket.

Yes No N/A

47.17.The following applies when a quantity value indicated or recorded by an auxiliary

element such as a console, ticket printer, or remote customer display, is a derived or 

computed value based on data received from a retail vehicle fuel dispenser.

47.15.1. The quantity values indicated or recorded on a console, electronic cash 
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register, or other auxiliary indicating or recording element may differ, 

however:

47.15.1.1. All indicated or recorded total money values for an individual sale 

shall agree, AND

Yes No N/A

47.15.1.2. The indicated or recorded quantity, unit price, and total sales price 

values shall be in mathematical agreement.

[Quantity x Unit price = Total sales price] to the closest cent.

Examples: $4.5549 rounds to $4.55

$4.5551 rounds to $4.56

$4.5550 rounds to either $4.55 or $4.56

Yes No N/A

Code Reference: S.2.5.1. Auxiliary Elements

Money value divisions on auxiliary elements such as remote consoles and printers shall 

be the same as on the primary element. Any recorded money value and any digital money 

value indication on a primary indicator must agree mathematically with its associated 

quantity representation or indication.

Formula: Unit Price x Indicated quantity = Total Sale 

47.18. Check mathematical agreement of all primary indications (e.g., dispenser, console, 

printer) under the following conditions:

47.18.1. At various flow rates, including maximum and minimum. Yes No N/A

47.18.2. Closing and reopening the nozzle outlet valve several times during delivery. 

Check mathematical agreement each time flow is halted.

Yes No N/A

47.18.3. At several unit prices including the low prices and the maximum pricing 

capability of the computer and when operating at the maximum flow rate.

Yes No N/A

47.18.4. Turn the dispenser off during delivery with nozzle outlet valve open. Yes No N/A

Code Reference: G-S.5.1. Indicating and Recording Elements/General

Discount Pricing

NIST Handbook 44 requires that, when a product or grade is offered for sale at more than one unit price through a 

computing device, the selection of the unit price shall be made prior to delivery using controls on the device or other 

customer-activated controls.

Should the customer elect to use another method of payment following completion of delivery, the console may be 

used to recalculate the total price  provided the dispenser complies with all applicable NIST Handbook 44

requirements. For example, the customer selects the credit card unit price on the dispenser and dispenses product at 

that unit price. However, the customer discovers that he forgot his credit card and decides to pay cash. In this case, the 

console might be used to calculate the total price at the cash unit price. In keeping with the intent of National 

Conference on Weights and Measures action in 1989 to require dispensers to calculate at all unit prices for which a 

product is offered for sale, it is anticipated that the console would be required to recalculate the new total price using 

the formula (quantity x unit price = total price). A receipt providing the total quantity, unit price, total computed price,

and product identity shall be available through a built-in or separate recording element for all transactions conducted 

with point-of-sale systems or devices activated by debit cards, credit cards, and/or cash (Code Reference 

S.2.6. Recorded Representations, Point of Sale Systems) as the transaction was completed. The recorded and displayed 

total quantity on the receipt and dispenser, respectively, shall agree.

Selectable Unit Price Capability

Selectable unit price capability is a design feature that permits the customer to select the unit price for a particular 

transaction at the time of sale. A dispenser may then allow the unit price for a delivery to be selected from two or more 

unit prices.
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If the customer selects the unit price at the dispenser (e.g., cash or credit price), the selection may be made at any time 

prior to the start of product flow. The dispenser operating “control” may be activated when the selection is made. A 

system shall not permit a change to the unit price during delivery of product.

Note: The term "control" generically refers to the handle, flapper, start button, on/off switch, or other 

mechanism used to activate or deactivate the dispenser.

Code Reference: S.2.5.2. Display of Quantity and Total Price

After a transaction is completed, the unit price displayed at the dispenser may be changed to a base unit price. 

However, the quantity and total price must be displayed on the face of the dispenser for at least 5 minutes or until the 

next transaction is initiated. Any display of quantity, unit price, and total price that does not mathematically agree 

occurs between transactions. This is permitted (in response to demands of device users) because the displayed values 

between "transactions" are not "significant" relative to the actual delivery process (transaction.)

The displayed unit price may revert to the base unit price immediately after the completion of a transaction, defined as 

the time the delivery has been terminated and payment has been settled. The payment may be automatic if the delivery 

is to a pre-paid amount. If the sale is prepaid, the delivery is considered terminated after the "control" is in the off 

position or after the nozzle has been returned to the designed hanging position. This will allow the customer adequate 

time to observe that the prepaid amount has been reached. If the delivery stops short or overruns a prepaid amount, 

settling the payment means that money is either refunded or collected from the customer and the transaction is "cashed 

out" by the console operator.

In the case of invoice billing systems, such as card-lock or key-lock systems which compute the total sale price, it is 

considered not appropriate for the displayed unit price to revert to the base unit price immediately following a 

transaction. Because a receipt for the transaction may not be available, the customer must be allowed an adequate 

period of time following the delivery to record the transaction information. The transaction unit price must be 

displayed for at least 30 seconds, and the total price and the quantity must be displayed for at least 5 minutes following 

the completion of the delivery or the start of the next transaction. The delivery is considered complete after the 

"control" is off or the nozzle has been returned to its designed hanging position.

Code Reference: S.2.4.1. Unit Price and S.2.4.3. Selection of Unit Price

47.19. The selected unit price must be made clearly evident on the dispenser. Yes No N/A

47.20. A dispenser may be equipped with means for selecting more than one unit price, 

provided that the selected unit price cannot be changed after the initial flow begins.

Yes No N/A

Code Reference: S.2.5.2. Display of Quantity and Total Price

47.21. The selected unit price displayed at the dispenser prior to the delivery of product 

must be continuously displayed at the conclusion of the delivery, after automatic 

termination by the dispenser or after manual termination by the customer using the 

controls at the device, until the start of the next transaction by whichever occurs first:

47.21.1. Customer initiation of the delivery using the controls at the device, OR Yes No N/A

47.21.2. "Authorization/Approval" by the console operator. Yes No N/A

47.22. When a delivery is completed, the total price and quantity for that transaction shall 

be displayed on the face of the dispenser for at least 5 minutes or until the next 

transaction is initiated by using controls on the device or other user-activated (e.g., 

customer-activated) controls.

Yes No N/A

47.23. In a system where a base unit price is automatically displayed on the dispenser after 

the completion of a transaction (e.g., product is dispensed and payment is settled), the 

dispenser may display the values for quantity, unit price, and total price that do not 

result in a mathematically correct equation. That is provided when the total price value 

displayed is divided by the quantity value displayed, the result is a unit price that is 

"posted" for a particular kind of transaction.

Yes No N/A
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Credit Card- or Debit Card-Activated Retail Vehicle Fuel Dispenser

On card-activated retail vehicle fuel dispensers, the customer authorizes the dispenser by 

inserting the card or swiping the card through a slot. On credit card transactions, the 

customer is typically billed through the same methods as have been used for credit 

transactions handled through a station attendant. On debit card transactions, payment is 

made directly from the purchaser's account by electronic funds transfer.

47.24. A receipt must be available to the customer at the completion of the transaction. 

The issuance of the receipt may be initiated at the option of the customer.

Yes No N/A

47.25. The customer receipt must contain the following information:

47.22.1. The identity (codes may be used) of the product purchased, the quantity 

purchased, the unit price, and the total price.

Yes No N/A

47.26. Cash Value Card - A cash value card that is initially encoded with the purchase 

price, authorizing a customer to purchase products up to the current cash value of the 

card. The value of the card is decreased in amounts equal to individual transactions.

Yes No N/A

Means shall be provided to the customer to determine the initial cash value of the card 

and the remaining cash value prior to and after each transaction.

47.27. Invoice Billing - Invoice billing is a process in which customers are billed for one 

or more transactions at the end of a billing period.

47.31.1. The date, quantity, unit price, and total price shall be recorded and shall agree 

with the indications on the dispenser.

Yes No N/A

47.27.3. All displayed transaction information must be shown for at least 30 seconds 

after completing a delivery or starting the next transaction. The delivery is 

considered complete after the "control" is off or after the nozzle has been 

returned to its designed hanging position.

Yes No N/A

Code Reference: S.1.3.1. Primary Elements/Units

47.28.A hydrogen gas-measuring device shall indicate, and record if the device is equipped 

to record, its deliveries in kilograms or decimal multiples or submultiples of the 

kilogram.

Yes No N/A

Code Reference: S.1.3.2. Numerical Value of Quantity-Divisions and S.1.3.3. Maximum Value of QuantityValue Divisions

47.29.The value of the scale division for the indicating and recording element must be in 

values of 1, 2, or 5 and uniform throughout the series. The maximum value of the 

quantity-value division shall not be greater than 0.5 % of the minimum measured 

quantity.

Yes No N/A

Code Reference: S.1.4. Value of Smallest Unit

47.30. The value of the quantity division shall not exceed the equivalent of 0.001 kg on 

devices with a marked maximum flow rate of 30 kg/min or less.

Yes No N/A

47.31. The value of the quantity division shall not exceed the equivalent of 0.01 kg on 

devices with a marked maximum flow rate greater than 30 kg/min.

Yes No N/A

Code Reference: S.2.7.; Indication of Delivery and S.3.5. Pressurizing the Discharge Hose

47.32. Retail devices shall automatically show their initial zero condition and amount 

delivered up to the nominal capacity of the device. The measurement, indication of 

Yes No N/A
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delivered quantity, and the indication of total sales price shall be inhibited until the 

fueling position reaches conditions necessary to ensure the delivery starts at zero.

Test Method:

a. Remove nozzle from dispenser and connect to test cylinder. Test cylinder 

initial pressure should not be greater than 2.5 MPa (360 psig) and should not be less 

than 2 MPa (290 psi) to simulate an actual delivery.

b. Turn nozzle valve from “OFF” to “FILL” position.

c. Empty discharge hose.

d. Turn nozzle valve to “OFF” position

e. Activate dispenser.

47.33. Dispenser indications shall not advance. Yes No N/A

Code Reference: S.2.3. Provisions for Power Loss and S.2.3.1. Transaction Information

Even if power fails during a delivery, it is still necessary to correctly complete all 

transactions in progress at the time of the power failure. Quantity and total sales price 

information shall be recallable for at least 15 minutes after the power failure. The 

information may be recalled at the dispenser or at the console if the console indications 

are accessible to the customer. Operator information, such as fuel and money value totals, 

shall be retained in memory during a power failure. The operator information is not 

required to be recallable during the power failure, but shall be recallable after power is 

restored. Test to determine if the indications are accurate when the delivery is continued 

after a power failure.

Note: For remote controllers (e.g., cash register, console, etc.) which have the capability 

to retain information pertaining to a transaction (e.g., stacked completed sales.) If the 

information cannot be recalled at the dispenser following a power outage, means (e.g., 

uninterruptible power supply or other means) must be provided to enable the transaction 

information to be recalled and verified for at least 15 minutes following a power outage.

Code Reference: S.2.3.2. User Information

47.34. The quantity and total sales price shall be recallable for 15 minutes after the power 

failure.

Yes No N/A

47.35. The quantity and total sales price values shall be correct if the power fails between 

deliveries.

Yes No N/A

47.36. The quantity and total sales price values shall be correct if the delivery is 

continued after a power failure.

Yes No N/A

47.37. The operator's information shall be retained in memory during a power failure. Yes No N/A

47.38. Remote controllers which stack completed sales must have a means to enable the 

transaction information to be recalled and verified for at least 15 minutes.

Yes No N/A

Code Reference: S.2.1. Return to Zero

The primary indicating and recording elements of a retail device shall readily return to a 

definite zero indication. Key-lock and other self-operated devices must have a zero-return 

indicating element, but they are not required to have the recording element return to zero. 

These devices may be equipped with cumulative recording elements. The primary 

indicating and recording elements shall not go beyond their correct zero position. 

47.39. Does the device have a primary recording element? Yes No N/A

47.40. The indicating and recording elements of a retail device shall be readily returnable Yes No N/A
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to a definite zero indication.

47.41. Key-lock and self-operated devices shall have an indicating element that return to 

zero.

Yes No N/A

47.42. Does the device have:

47.42.1. A cumulative indicating element? Yes No N/A

47.39.2. A cumulative recording element? Yes No N/A

47.43. Primary indicating and recording elements shall not go beyond their correct zero 

position.

Yes No N/A

Code Reference: S.2.4. Display of Unit Price and Product Identity

A computing or money-operated device shall have a means on the face of the device for 

displaying the unit price at which it is set to compute or deliver and for posting the 

product identity. When a product is offered for sale at more than one unit price from a 

device, then all of the unit prices at which that product is offered for sale shall be 

displayed or shall be capable of being displayed on the dispenser using controls available 

to the customer prior to the delivery of the product. The unit price shall be expressed as a 

decimal value in dollars.

Code Reference: S.2.4.1. Unit Price, S.2.4.2. Product Identity, and S.2.4.3. Selection of Unit Price

47.44. Means shall be provided to display the unit price on each face of the device. Yes No N/A

47.45. Means shall be provided to post on each side of the device the identity of the 

dispensed product.

Yes No N/A

47.46. When a product is offered for sale at more than one unit price from a device, then 

all of the unit prices at which that product is offered for sale:

47.46.1. Shall be displayed prior to the delivery of the product, OR Yes No N/A

47.46.2. Shall be capable of being displayed on the dispenser using controls available 

to the customer.

Yes No N/A

47.46.3. A system shall not permit a change to the unit price during delivery of 

product.

Yes No N/A

Note: It is not necessary to simultaneously display all of the unit prices, provided the 

dispenser complies with HB 44 section S.2.4.1.

The unit prices for each product and price level may be:

a. Displayed simultaneously for all products,

b. Displayed simultaneously for each product separately, OR

c. Displayed individually in a unit-price display only if controls permit the customer 

to sequence the display through the unit prices for each and every product.

47.47.The unit price shall be expressed in dollars and decimals of dollars using a dollar sign. 

A common fraction shall not appear in the unit price, (e.g., $4.29 not $4 29/100).

Yes No N/A

Code Reference: S.2.5.2. Display of Quantity and Total Price

47.48.When a delivery is completed on a computing device, the total price and quantity for 

that transaction shall be displayed on the face of the dispenser for at least 5 minutes or 

until the next transaction is initiated by using controls on the device or other customeractivated controls.

Yes No N/A
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Note: The displayed unit price may revert to a base unit price immediately after the 

completion of a transaction, defined as the time the delivery has been terminated and 

payment has been settled. Any display of quantity, unit price, and total price that does not 

mathematically agree occurs between transactions and is permitted (in response to 

demands of device users) because the displayed values between "transactions" are not 

"significant" relative to the actual delivery process (transaction.)

48. Computing

Code Reference: S.2.5. Money-Value Computations

A hydrogen gas dispenser used to fuel vehicles shall be capable of computing total sale prices for all unit prices and for 

all deliveries within the range of measurement or computing capacity. 

48.1 A retail computing device shall compute total sale prices for all quantities and unit 

prices within the range of its quantity and computing capacities.

Yes No N/A

Code Reference: S.2.4.4. Agreement between Indications

48.2. All quantity, unit price, and total price indications shall agree. Yes No N/A

Code Reference: S.2.5.1. Auxiliary Elements

48.3. All indicated money value divisions and quantity value divisions on auxiliary elements 

shall be identical with those of the primary element.

Yes No N/A

49. Recorded Representations, Point of Sale Systems, and Printed Receipt

A printed receipt shall be available through a built-in or separate recording element for transactions conducted with 

point-of-sale systems or devices activated by debit cards, credit cards, and/or cash. The printed receipt shall contain the 

following information for products delivered by the dispenser.

Code Reference: S.2.6. Recorded Representations, Point of Sale Systems

49.1. A printed receipt shall be available for devices activated by debit cards, credit cards, 

and/or cash. The printed receipt:

Yes No N/A

49.1.1. Shall contain the total mass of the delivery; Yes No N/A

49.1.2. Shall contain the unit price; Yes No N/A

49.1.3. Shall contain the total computed price; and, Yes No N/A

49.1.4. Shall contain the product identity by name, symbol, abbreviation, or code 

number.

Yes No N/A

Code Reference: S.6. Printer

49.2. Printed information must agree with the indications on the dispenser. Yes No N/A

49.2.1. Printed values shall be clearly defined. Yes No N/A

Code Reference: S.6.1. Printed Receipt

49.3. Any delivered, printed quantity 

49.3.1. Shall include an identification number, and; Yes No N/A

49.3.2. Shall include the time and date, and; Yes No N/A

49.3.3. Shall include the name of the seller. Yes No N/A
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50. Design of Measuring Elements and Measuring Systems

Code Reference: S.3.1. Maximum and Minimum Flow-Rates

50.1. The ratio of the maximum to minimum flow-rates for devices measuring gases shall be 

10:1 or greater.

Yes No N/A

Code Reference: S.3.2. Adjustment Means

50.2. Means shall be provided to change the ratio between the indicated quantity and the 

quantity of gas measured by the assembly.

Yes No N/A

50.2.1. A bypass on the measuring assembly shall not be used for these means. Yes No N/A

Code Reference: S.3.2.1. Discontinuous Adjustment Means

50.2.2. When the adjusting means changes the ratio between the indicated quantity 

and the quantity of measured gas in a discontinuous manner, the consecutive 

values of the ratio shall not differ by more than 0.1%.

Yes No N/A

Code Reference: S.3.3. Provision for Sealing

Measuring elements shall be designed with adequate provisions to prevent changes from being made to the measuring 

element or the flow rate control (if the flow rate control affects the accuracy of deliveries) without evidence of the 

change being made. These provisions can be an approved means of security (e.g., data change audit trail) or physically 

applying a security seal which must be broken before adjustments can be made. When applicable, the adjusting 

mechanism shall be readily accessible for the purposes of affixing a security seal.

50.3. A measuring element shall have provisions for either:

50.3.1. Applying a physical security seal, OR Yes No N/A

50.3.2. An approved means of security (e.g., data change audit trail) so that no 

changes may be made to its adjustable components.

Yes No N/A

50.4. Any adjustable element controlling the delivery rate shall provide for sealing or other 

approved means of security (e.g., data audit trail) if the flow rate affects the accuracy of 

deliveries.

Yes No N/A

50.5. When applicable, the adjusting mechanism shall be readily accessible for the purposes 

of affixing a security seal.

Yes No N/A

50.6. Audit trails shall use the format set forth in the Common and General Code Criteria 

section of this checklist (Code Reference G-S.8 LMD-23) and in Appendix A, 

Philosophy for Sealing.

Yes No N/A

50.7. Retail vehicle fuel dispensers with remote configuration capabilities shall be sealed 

according to Table S.3.3. of NIST HB 44 Section 3.39 Hydrogen Gas-Measuring 

Devices – Tentative Code and according to Appendix A, Philosophy for Sealing.

Yes No N/A

Code Reference: S.3.4. Automatic Density Correction

50.8. An automatic means to determine and correct for changes in product density due to 

changes in temperature, pressure, and composition, shall be incorporated in any 

hydrogen gas-measuring system that is affected by changes in the density of the product 

being measured.

Yes No N/A

Code Reference: S.3.6. Zero-Set-Back Interlock, Retail Vehicle Fuel Devices

The zero-set-back interlock on a dispenser is critical to prevent fraudulent practices. A 

retail vehicle fuel device shall have an effective automatic interlock such that once the 

dispenser shuts off, it cannot be restarted without resetting the indicating element to zero. 
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This requirement also applies to the recording element if one is present. The dispenser 

shall be designed so that the starting lever must be in the shut-off position and the 

interlock engaged before the discharge nozzle can be returned to its designed hanging 

position. If a single pump supplies more than one dispenser, then each dispenser shall 

have an automatic control valve that prevents product from being delivered by a dispenser 

until its indications have been set to zero.

50.9. After the device is turned off by moving the lever that stops the flow, a subsequent 

delivery shall be prevented until the indicators (and recording element if present) have 

returned to their correct zero positions.

Yes No N/A

50.10.The starting lever shall be in shut off position and zero-set-back interlock engaged 

before the nozzle can be returned to its designed hanging position. That is any position 

where the tip of the nozzle is placed in its designed receptacle and the lock can be 

inserted.

Yes No N/A

50.11.If more than one dispenser is connected to a single source, an automatic control valve 

shall prevent fuel from being delivered until the indicating elements have been returned 

to their correct zero position and engaged.

Yes No N/A

50.12.The use of the interlock shall be effective under all conditions when any control on the 

console, except a system emergency shut-off, is operating and after any momentary 

power failure.

Yes No N/A

51. Discharge Lines and Valves

Code Reference: S.4.1. Diversion of Measured Product

51.1. No means shall be provided by which any measured product can be diverted from the 

measuring device.

Yes No N/A

Code Reference: S.4.2. Directional Flow Valves

51.2. Valves intended to prevent the reversal of flow shall be automatic in operation. Yes No N/A

Code Reference: S.4.3. Other Valves

51.3. Check valves and closing mechanisms that are not used to define the measured 

quantity shall have relief valves (if necessary) to dissipate any abnormally high 

pressure that may arise in the measuring assembly.

Yes No N/A

52. Markings

Code Reference: S.5. Marking Requirements

52.1. A measuring system shall be conspicuously, legibly, and indelibly marked with:

52.1.1. Pattern approval mark (e.g., type approval number); Yes No N/A

52.1.2. Name and address of the manufacturer or his trademark and, required by the 

weights and measures authority, the manufacturer's identification mark in 

addition to the trademark;

Yes No N/A

52.1.3. Model designation or product name selected by the manufacturer; Yes No N/A

52.1.4. Non-repetitive serial number; Yes No N/A

52.1.5. Accuracy class of the meter as specified by the manufacturer consistent with 

Table T.2. Accuracy Classes and Tolerances for Hydrogen Gas-Measuring 

Devices;

Yes No N/A
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52.1.6. Maximum and minimum flow rates in kilograms per unit of time; Yes No N/A

52.1.7. Maximum working pressure; Yes No N/A

52.1.8. Applicable temperature range if other than - 10 °C to +50 °C; Yes No N/A

52.1.9. Minimum measured quantity (MMQ.); Yes No N/A

52.1.10. Product limitations (such as fuel quality) if applicable. Yes No N/A

Code Reference: S.5.1. Location of Marking Information; Retail Vehicle Fuel 

Dispensers

52.2. The marking information required in the General Code, Paragraph G-S.1. Identification 

shall appear as follows:

52.2.1. Within 60 cm (24 in) to 150 cm (60 in) from the base of the dispenser, Yes No N/A

52.2.2. Either internally and/or externally provided the information is permanent and 

easily read and accessible, AND

Yes No N/A

52.2.3. On a portion of the device that cannot be readily removed or interchanged 

(e.g., not on a service access panel.).

Yes No N/A

Note: The use of a dispenser key or tool to access internal marking information is 

permitted for retail hydrogen-measuring devices.

53. Totalizers

Code Reference: S.7. Totalizers for Retail Vehicle Fuel Dispensers

53.1. Vehicle fuel dispensers shall be equipped with a non-resettable totalizer for the quantity 

delivered through each separate measuring device.

Yes No N/A

54. Minimum Measured Quantity

Code Reference: S.8. MMQ

54.1. The minimum measured quantity shall satisfy the conditions of use of the measuring 

system as follows:

54.1.1. An MMQ not exceeding 0.5 kg for measuring systems with maximum flow 

rate less than or equal to 4 kg/min, OR

Yes No N/A

54.1.2. An MMQ not exceeding 1.0 kg for measuring systems with maximum flow 

rate greater than 4 kg/min but not greater than 12 kg/min.

Yes No N/A

55. Card-Activated Hydrogen Gas-Measuring Devices

Code Reference: G-S.2. Facilitation of Fraud

There is great concern regarding the potential for accidental or intentional fraud when card-activated systems are used 

in service stations, especially because bank-card-activated systems give direct access to bank accounts. The following 

criteria and test procedures apply to card-activated retail vehicle fuel dispensers.

A card-activated system shall authorize the dispensing of product for not more than three minutes of the time between 

authorization and “control” on at the dispenser. It shall properly record transactions on the appropriate card account.

When a card-activated system is subjected to power loss of greater than 10 seconds, the dispenser shall deauthorize. 

Because systems may be installed with separate power lines to the console, card reader, and dispenser, the different 

parts of the system should be tested with power failures to evaluate the potential for accidental or intentional errors. 

The appropriate device response depends upon when the power loss occurs during the delivery sequence.
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Note: The term "control" generically refers to the handle, flapper, start button, on/off switch, or other mechanism used 

to activate or deactivate the dispenser.

55.1. The dispenser must de-authorize in not more than three minutes if the pump "control" is 

not turned on.

Yes No N/A

55.2. If the time limit to deactivate a dispenser is programmable, it shall not accept an entry 

greater than three minutes.

Yes No N/A

55.3. When a power loss greater than 10 seconds occurs after the pump "control" is on, the 

dispenser must de-authorize.

Yes No N/A

55.4. When there is a loss of power, but the dispenser "control" is not on, the dispenser must 

de-authorize in not more than three minutes.

Yes No N/A

56. Test Methods for Card-Activated Retail Vehicle Fuel Dispensers

56.1. Authorize the dispenser and, with the pump "control" on, interrupt power to any part (or 

all) of the system. The pump should de-authorize immediately.

Yes No N/A

56.1.1. Authorize with a card and turn the "control" on. Power down briefly, then 

restore power. Try to dispense product: the dispenser must not dispense 

because the power failure should have de-authorized the dispenser.

Yes No N/A

56.2. Authorize the dispenser using a card (leaving control off); wait more than three 

minutes, and try to start the dispenser. It should not start because the authorization 

should have timed out.

Yes No N/A

56.2.1. Authorize with a card, but do not turn the "control" on. Power down for more 

than three minutes, and then restore power. Try to dispense product; the 

dispenser should have "timed-out" and not dispense.

Yes No N/A

56.2.2. Authorize and dispense with card #1. Allow the system to time out and deauthorize (if it does). Do not turn off the "control." Authorize and dispense 

with card #2. The transactions shall be properly recorded for each card.

Yes No N/A

56.2.3. Authorize with card #1. Turn the "control" on, then off. Authorize with card 

#2. Dispense product and complete the delivery. Check the printed receipt to 

verify that the delivery has been properly charged to card #2

Yes No N/A

56.2.4. Turn the dispenser "control" on, and use a card to authorize the dispenser. 

Turn the "control" off. After a period of 15 seconds, turn the "control" on. Try 

to deliver product; the dispenser must not dispense.

Yes No N/A

56.2.5. Authorize with card #1 (do not turn the "control" on) and interrupt power for 

at least 10 seconds. This should de-authorize the dispenser. Resupply power; 

turn the "control" on; try to dispense. The dispenser shall not deliver product.

Yes No N/A

56.2.6. Authorize with card #1 (turn the "control" on) and interrupt power for at least 

10 seconds. This should de-authorize the dispenser. Resupply power; turn the 

"control" on; try to dispense. The dispenser shall not deliver product.

Yes No N/A

Note: This test is not required if the device under test complies with paragraph 10.1.

56.2.7. Authorize a dispenser with card #1, but do not turn the dispenser "control" on. 

Try to authorize the same dispenser with card #2; it should not be accepted 

until after the 3 minute time-out.

Yes No N/A

56.3. Attempt to override or confuse the card system by varying the length of time the card is 

in the slot, (e.g., vary the "swipe" times) and pushing all other keys on the keypad 

Yes No N/A
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during each step of the authorization process.

57. Cash Activated Hydrogen Gas-Measuring Devices

The following criteria and test procedures apply to cash-activated retail vehicle fuel dispensers. Tests using various 

denominations of bills accepted by the cash acceptor should be performed.

Certificates of Conformance will cover the use of the cash acceptor option at both attended and unattended stations. 

Cash Acceptors which are used at unattended locations must meet the marking requirements of paragraph G-UR.3.4. 

Responsibility, Money-Operated Devices shall be clearly and conspicuously displayed on the device or immediately 

adjacent to the device information detailing the return of monies paid when the product cannot be obtained.

Even if power is interrupted during a delivery, it is still necessary to correctly complete all transactions in progress at 

the time of the power interruption. In the event of a power loss, the information needed to complete any transaction in 

progress at the time of the power loss (such as the quantity and unit price, sales price, or amount of money already 

inserted into the cash acceptor) shall be determinable for at least 15 minutes at the dispenser or at the console or journal 

printer if the console or journal printer is accessible to the customer.

All portions of the transaction must be accounted for in order to complete the transaction. This information includes the 

following: (1) the total amount of money that was inserted into the device prior to the power interruption; (2) the 

amount of product already dispensed (which should be available from the dispenser and which must comply with the 

requirements of S.2.3. Provision for Power Loss; (3) and any bill that has been inserted but has not yet been recognized 

by the cash acceptor.

Note: For bills that have not yet been drawn into the cash acceptor to the point that the bill is no longer visible, it is 

assumed that the information on the bill denomination can be obtained from visual examination.

Various methods may be used to recall specific portions of the transaction depending on how the basic system 

operates. For example, systems that can print a record of the amount fed into the machine as each bill is fed into the 

device maintain an ongoing record of bills recognized by the system. Other systems may not print a receipt until the 

end of the transaction, so the information is recalled on a journal printer accessible to the customer or can be recalled 

on the cash acceptor display.

Check to see what happens when the power is interrupted at different points of the transaction. Note what occurs at the 

points where power is interrupted, what information is provided to the customer on the receipt, audibly and visually in 

the form of instructions or error messages. Because systems may be installed with separate power lines to the console, 

card reader, and dispenser may be installed, tests should be run with power interruptions to different parts of the system 

to evaluate the potential for accidental or intentional errors. The appropriate device response depends upon when the 

power loss occurs during the delivery sequence.

Code Reference: S.2.3. Provisions for Power Loss

57.1. Systems with Battery Back-up or Uninterruptible Power Supply or Equivalent - Some 

systems are equipped with a battery back-up or an uninterruptible power supply (or 

equivalent) which allows a transaction to continue in the event of a power loss. For such 

systems, the transaction in progress at the time of a power interrupt must continue as if 

no power interruption had occurred (or comply with the requirements for systems not 

equipped with a battery back-up.) That is, all bills (including bills being fed into the 

device at the time of the power loss) must be correctly accounted for, and the quantity 

and total sale amounts must be mathematically correct. Check these systems by 

interrupting power at several points in the transaction to ensure that all information 

(total price, quantity, mathematical agreement, and total dollar amount inserted by the 

customer) is accounted for correctly.

Yes No N/A

All Other Systems: To check the operation of systems not equipped with a battery 

backup, uninterruptible power supply, or equivalent, interrupt power as described below. 

As noted earlier, if separate power lines supply different components in the system, 

interrupt power to different parts of the system.
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57.2. When one or more bills has been accepted and registered by the device, but product has 

not yet been dispensed, at least one of the following criteria must be met to ensure that 

this information can be recalled in the event of a power interruption:

57.2.1. The denomination of the bill must be printed by the printer on the device as 

the device recognizes the bill. (The printed receipt must be available to the 

customer.)

Yes No N/A

57.2.2. The denomination of each bill must be printed by a journal or other printer 

accessible to the customer as each bill is recognized by the device.

Yes No N/A

57.2.3. The running total display must be capable of being recalled for at least 15 

minutes.

Yes No N/A

57.2.4. Means provided to enable the customer to retrieve the money inserted into the 

device (e.g., a button which can be used during a power interruption to eject 

the money inserted by the customer.)

Yes No N/A

57.2.5. Other means used to provide a visual or printed record of the total amount of 

money accepted by the device.

Yes No N/A

57.3. There is a brief period of time during which a bill has been accepted by the cash 

acceptor but has not yet been recognized by the device. The following criteria must be 

met to ensure that this information can be recalled in the event of a power failure.

Yes No N/A

57.3.1. Means provided to enable the attendant or customer to retrieve the bill (for 

example, a button which can be used during a power interruption to eject the 

bill or if the cash acceptor box can be removed by the attendant and the bill 

retrieved.)

Yes No N/A

Note: There may be a space of time in which a bill can be caught partially in and out of 

the cash acceptor during a power interruption. In such a case, if the denomination of the 

bill is visible to the customer and attendant, this is sufficient to provide information about 

the bill being fed into the device at the time of the power interruption. The cash acceptor 

must comply with the other applicable items noted above.

It is expected that the retail vehicle fuel dispenser will comply with paragraph S.2.3. 

Provision for Power Loss; and the information on the product already dispensed can be 

recalled through this portion of the system.

57.4. Power should be interrupted at different points in the transaction to determine that all 

transaction information can be recalled in the event of a power interruption including 

combinations of the following:

57.4.1. After one bill has been inserted. Yes No N/A

57.4.2. After several bills have been inserted Yes No N/A

57.4.3. While a bill is being inserted. Yes No N/A

57.4.4. After a bill has been inserted but not yet recognized. Yes No N/A

57.4.5. After a bill(s) has been inserted and recognized, but the on/off control is still 

in the "off" position.

Yes No N/A

57.4.6. After a bill(s) has been inserted and recognized, the on/off control is in the 

"on" position, but no product has been dispensed.

Yes No N/A

57.4.7. After a bill(s) has been inserted and recognized, the on/off control is in the 

"on" position, and product is being dispensed.

Yes No N/A

Code Reference: G-S.5.1. Indicating and Recording Elements, General
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57.5. A running display showing the amount of money fed into the machine must be 

provided. It is not necessary for this information to be displayed once the customer 

initiates delivery.

Yes No N/A

Code Reference: S.2.6. Record Representation, Point of Sale Systems

57.5.1. A printed receipt must be available to the customer from the device at the 

completion of the transaction. The issuance of the receipt may be initiated at 

the option of the customer.

Yes No N/A

57.5.2. The customer receipt must contain the following information:

57.5.2.1.The identity (codes may be used) of the product purchased, the 

quantity purchased, the unit price, and the total price.

Yes No N/A

Because the customer must be provided with the option of 

receiving a receipt, at unattended devices the system must not 

accept cash if sufficient paper is not available to complete the 

transaction.

57.6. The cash acceptor must not initiate a cash transaction if either of the following 

conditions is true:

57.6.1. No paper is in the receipt printer of the cash acceptor. Yes No N/A

57.6.2. Insufficient paper is available to complete a transaction Yes No N/A

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

57.7. Instructions must be marked on the device to inform the customer how to operate the 

cash acceptor.

Yes No N/A

Code Reference: G-S.2. Facilitation of Fraud

57.8. Means must be provided for the customer to cancel the transaction at any point.

57.8.1. The customer has inserted cash, but has not yet dispensed product. If the 

customer cancels the transaction by pressing the cancel key (or equivalent 

key(s)) or by lowering the on/off control, the device must either:

57.8.1.1.Be equipped with means for the customer to retrieve the cash inserted 

from the device, AND

Yes No N/A

Automatically issue a printed receipt indicating the amount 

tendered and the amount returned,

OR

57.8.1.2.Display instructions (such as "sale terminated, see attendant," "sale 

terminated, get receipt" or similar wording) for the customer to see the 

attendant, AND

Yes No N/A

Automatically issue a printed receipt showing the amount of 

cash inserted by the customer, a statement indicating that the 

sale was terminated, and instructions for the customer to see 

the attendant.

57.8.2. The customer has inserted cash and has started dispensing product. If the 

customer cancels or discontinues the transaction by pressing the cancel key 

(or equivalent key(s)) or lowering the on/off control before reaching the total 

money inserted into the device, the device must:
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57.8.2.1.Display instructions for the customer to obtain the receipt and to see 

the attendant.

Yes No N/A

57.8.2.2.Automatically issue a printed receipt showing the amount of cash 

inserted, the amount dispensed, the balance due to the customer, a 

statement indicating that the sale was terminated, and instructions for 

the customer to see the attendant.

Yes No N/A

Note: It is acceptable for different messages to be used. This depends upon 

whether the transaction is terminated by use of the cancel key, (e.g., "sale 

terminated, get receipt" or "sale terminated, see attendant") or by lowering 

the on/off “control” (e.g., "change due, see attendant").
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Appendix C

Attendee List-October 12, 2011

Meetings of the USNWG Hydrogen Device Standards and Fuel Specifications Subcommittees

Name Agency Device Standards Subcommittee 

(DSS) Member Yes (Y)

Fuel Specifications Subcommittee 

(FSS) Member Yes (Y)

Attended

Yes (Y)

Robert Boyd, Chair FSS Boyd Hydrogen, LLC Y Y Y

Tina Butcher NIST OWM LMDP Y Y Y

Marc Buttler NIST OWM LMDP Y Y Y

Jacquelyn Birdsall California Fuel Cell Partnership Y Y

Paul Cecil Emerson Process Management–

Micro Motion, Inc. Y Y Y

Joseph Cohen Air Products and Chemicals, Inc. Y Y Y

R. J. Frame Linde Y Y Y

Michael Keilty Endress & Hauser Flowtec AG Y Y Y

Jeff Lampmann NE-Dept. of Ag. 

Weights and Measures Y Y Y

Kristin Macey 

Chair DSS

CA – Food and Agriculture, 

Division of Measurement Standards Y Y Y

Juana Williams NIST OWM LMDP Y YY

John Mough CA-Food and Ag. Div. of 

Measurement Standards Guest Y

Jim Ohi Consultant (DOE) Guest Y

John Roach CA-Food and Ag. Div. of 

Measurement Standards Guest Y

Sam Snyder Linde Guest Y