Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices Episode 1 pps

Added the phrase “or interchange” following “adjustment” for consistency among the Section 3.30.. Added the phrase “or interchange” following “adjustment” for consistency among the Secti

United States Department of Commerce Technology Administration National Institute of Standards and Technology

SPECIFICATIONS, TOLERANCES,

AND OTHER TECHNICAL

AND MEASURING DEVICES

as adopted by

the 91st National

Specifications, Tolerances,

and Other Technical

Requirements for

Weighing and Measuring Devices

as adopted by the 91st National Conference on Weights and Measures 2006

Editors:

Tina Butcher Linda Crown Lynn Sebring Richard Suiter Juana Williams

National Institute of Standards and Technology Weights and Measures Division

Gaithersburg, MD 20899-2600

U S Department of Commerce

Carlos M Gutierrez, Secretary

Technology Administration

Robert Cresanti, Under Secretary

of Commerce for Technology

National Institute of Standards and Technology

William A Jeffrey, Director

NIST Handbook 44

2007 Edition Supersedes NIST Handbook 44, 2006 Edition

Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities,

materials, or equipment are necessarily the best available for the purpose

National Institute of Standards and Technology Handbook 44, 2007 Edition

Natl Inst Stand Technol Handb 44, 2005 Ed., 319 pages (Oct 2006)

NIST has a statutory responsibility for "cooperation with the states in securing uniformity of weights and measures laws and methods of inspection." In partial fulfillment of this responsibility, NIST is pleased to publish these recommendations of the NCWM

This handbook conforms to the concept of primary use of SI (metric) measurements recommended in the Omnibus Trade and Competitiveness Act of 1988 by citing SI units before inch-pound units where both units appear together and placing separate sections containing requirements in SI units before corresponding sections containing requirements in inch-pound units In some cases, however, trade practice is currently restricted to the use of inch-pound units; therefore, some requirements in this handbook will continue to specify only inch-pound units until the NCWM achieves a broad consensus on the permitted SI units

In accord with NIST policy, the meter/liter spellings are used in this document However, the metre/litre spellings are acceptable, and are preferred by the NCWM

It should be noted that a space has been inserted instead of commas in all numerical values greater than 9999 in this document, following a growing practice, originating in tabular work, to use spaces to separate large numbers into groups

of three digits This avoids conflict with the practice in many countries to use the comma as a decimal marker

iii

Handbook 44 - 2007

Committee on Specifications and Tolerances

of the 91 st Conference

Clark Cooney, OR Carol Fulmer, SC Todd R Lucas,OH Bret Saum, CA Michael Sikula, NY Ted Kingsbury, Canada, Technical Advisor Juana Williams and Richard Suiter, NIST, Technical Advisors

Past Chairmen of the Committee

8-11 L.A Fischer, NBS 67 F.C Nagele, MI

12-28 F.S Holbrook, NBS 68 L.H DeGrange, MD

29-38 J.P McBride, MA 69 S.A Colbrook, IL

43-44 J.E Brenton, CA 71-72 F Gerk, NM

iv

Handbook 44 - 2007

Table of Contents

Page

Foreword iii

Committee iv

Table of Contents v

2006 Amendments vii

2006 Editorial Changes ix

Introduction 1 Section 1

1.10 General Code 1-1 Section 2

2.20 Scales 2-3 2.21 Belt-Conveyor Scale Systems 2-47 2.22 Automatic Bulk Weighing Systems 2-57 2.23 Weights 2-63 2.24 Automatic Weighing Systems 2-67 Section 3

3.30 Liquid-Measuring Devices 3-3 3.31 Vehicle-Tank Meters 3-21 3.32 Liquefied Petroleum Gas and Anhydrous Ammonia Liquid-Measuring Devices 3-31 3.33 Hydrocarbon Gas Vapor-Measuring Devices 3-41 3.34 Cryogenic Liquid-Measuring Devices 3-49 3.35 Milk Meters 3-57 3.36 Water Meters 3-65 3.37 Mass Flow Meters 3-71 3.38 Carbon Dioxide Liquid-Measuring Devices 3-83 Section 4

4.40 Vehicle Tanks Used as Measures 4-3 4.41 Liquid Measures 4-7 4.42 Farm Milk Tanks 4-9 4.43 Measure-Containers 4-15 4.44 Graduates 4-17 4.45 Dry Measures 4-21 4.46 Berry Baskets and Boxes 4-23 Section 5

5.50 Fabric-Measuring Devices 5-3 5.51 Wire- and Cordage-Measuring Devices 5-7 5.52 Linear Measures 5-11 5.53 Odometers 5-13 5.54 Taximeters 5-17 5.55 Timing Devices 5-23 5.56.(a) Grain Moisture Meters 5-27 5.56.(b) Grain Moisture Meters 5-35 5.57 Near-Infrared Grain Analyzers 5-41 5.58 Multiple Dimension Measuring Devices 5-49 5.59 Electronic Livestock, Meat, and Poultry Evaluation Systems and/or Devices - Tentative Code 5-57

v

Handbook 44 - 2007

Table of Contents (continued)

Page Appendices

A Fundamental Considerations Associated with the Enforcement of Handbook 44 Codes A-1

B Units and Systems of Measurement - Their Origin, Development, and Present Status B-1

C General Tables of Units of Measurement C-1

D Definitions D-1

vi

2006 Amendments Handbook 44 - 2007

SECTION CODE

S&T ITEM

LPG & Anhydrous

Ammonia Liquid Measuring Devices

332-2 S.4.3

Added, renumbered subsequent paragraph 3-36

2006 Amendments Handbook 44 - 2007

SECTION CODE PARAGRAPH ACTION PAGE

S.4.4.2 Moved “required” so that it appears after

“information” in lead sentence 3-12

UR.3.3

Deleted reference to paragraph becoming retroactive in 1999 Change numbering of paragraph from “(1), (2) and “(a), (b) ” to

be consistent with other paragraphs

3-17

S.1.1.1 Changed “Note” to correctly reference UR.2.2

S.2.2

Added the phrase “or interchange” following

“adjustment” for consistency among the Section 3.30 codes

3-23

T.2 Deleted “Maintenance and Acceptance” since

Table 1 also includes Special Test Tolerances 3-28 Replace “range of test results for the” with the

“difference between ” in the lead paragraph to clarify the application of the paragraph

Added the phrase “or interchange” following

“adjustment” for consistency among the Section 3.30 codes

3-34

Table T.2 Change “Vehicle-Tank” to “Vehicle-Mounted” in

the “Application” column 3-38 3.32

LPG and Anhydrous Ammonia Liquid-

Measuring Devices

UR.2.6 Added “or as otherwise specified by the

customer” to be consistent with other codes 3-40 3.33

Hydrocarbon Gas

Vapor-Measuring

Devices

S.2.2

Added the phrase “or interchange” following

“adjustment” for consistency among the Section 3.30 codes

3-43

Added the phrase “or interchange” following

“adjustment” for consistency among the Section 3.30 codes

3-59

3.36 Water Meters S.2.1

Added the phrase “or interchange” following

“adjustment” for consistency among the Section 3.30 codes

3-66

S.1.3.2 Deleted “hyphens” and replaced them with “(a),

(b)” for consistency 3-71 S.3.5

Added the phrase “or interchange following

“adjustment” for consistency among the Section 3.30 codes

3-74

S.5 Changed “designation” to “identifier” 3-76 3.37 Mass Flow Meters

UR.3.3 Deleted reference to paragraph becoming

retroactive in 1999 and deleted italics 3-80

x

Handbook 44 - 2007 2006 Amendments

SECTION CODE PARAGRAPH ACTION PAGE

S.1.7 Added “Except for entries of tare,” before “the

minimum length “ for clarity 5-51 S.1.8 Deleted “Except for entries of tare,” for clarity 5-51 S.1.8.(a), (b) Replaced “display” and “displayed” with

“indicate” and “indicated” 5-51 S.1.9 Replaced “display” and “displayed” with

“indicate” and “indicated” 5-51 Table S.4.1.a

Replaced “side” with “axis” in “Minimum and Maximum Dimensions for Each Side: for clarity

Added “(or each axis and range)” to the end of

“Value of Measuring Division, d” for clarity

5-52

Table S.4.1.b., Note 3

Replaced “can be shown as follows” with

“ shall be marked For example:” 5-53

5.58

Multiple Dimension Measuring Devices

Table S.4.1.b., Note 7 Added “speed” following “dimensions.” 5-53

5.59

Electronic Livestock, Meat, and Poultry Evaluation Systems and/or Devices

UR.4 Replaced “a national standard” with “the

appropriate SI standard” in the last sentence 5-58

Units of Length,

1 mile (mi) international

Deleted the underline from the term “feet” in the

zero-Replaced the definition with “See zero-tracking.”

Moved the definition to “zero-tracking.” D-2 decimal

submultiples

Added a definition to complement the definition

of binary submultiples and to eliminate confusion over the difference between the uses of the two terms

D-6

multi-interval

Removed the parentheses in the first reference to

“segments” and deleted the “s” in the second reference Inserted “each partial” prior to

“weighing range” to clarify application

D-12 Appendix D Definitions

zero-tracking

Replaced “See automatic zero-setting mechanism” with the definition from “automatic zero-setting mechanism.”

D-23

xi

Introduction Handbook 44 - 2007

NIST Weights and Measures Division

100 Bureau Drive, Stop 2600 Gaithersburg, Maryland 20899-2600 Attention: Specifications and Tolerances Committee

b A copy of the proposal must be sent to the NCWM’s Executive Secretary at the same address

G Criteria for Inclusion in the Committee’s Agenda

a Any issue approved by at least one regional association and received by the November 1 deadline will be automatically placed on the Committee’s Interim Meeting Agenda

b Issues that have not been approved by a regional association, but which are received by November 1, will be evaluated by the Committee using the criteria in Section H, Exceptions to Policy and Section I, Committee Agenda

c Any proposal received after the November 1 deadline, but prior to the Interim Meeting, will be evaluated by the

Committee according to Section H, Exceptions to Policy and Section I, Committee Agenda Only those issues determined to be a national “Priority” will be included on its agenda

d Proposals must be in writing and must include:

(1) a concise statement of the issue or problem outlining the purpose and national need for its consideration When possible, an electronic copy of the background material and proposed amendment(s) should be submitted in a PC-compatible word processing document format (e.g., Corel WordPerfect or Microsoft Word) on electronic media or by electronic mail using the same format;

(2) background material including test data, analysis of test data, or other appropriately researched and documented material from which the Committee will be able to make a judgment for either a firm recom-mendation or consideration of the need for further study;

(3) proposed solutions to problems stated in specific language in amendment form to Conference documents; and

(4) practical, realistic, and specific recommendations for both regulations and test methods to provide for proper enforcement if a proposal involves a new area of weights and measures activity

When proposals are to modify or add requirements to existing publications, such as Handbook 44, the proposal should:

(i) Identify the pertinent portion, section, and paragraph of the existing publication that would be changed (e.g., Sec 1.10 General Code, Paragraph G-A.1 Commercial and Law-Enforcement Equipment.) (ii) Provide evidence of consistency with other NCWM publications such as with other specific device code sections

(iii) Provide evidence of consistency with federal laws and regulations (e.g., USDA)

(iv) Relay the positions of businesses, industries, or trade associations affected by the proposal including supporting and opposing points of view

H Exceptions to Policy for Submission of Issues to a Committee Agenda; Submission of “Priority” Issues

The Committee will use the following criteria to evaluate issues that have not been approved by a regional association, but have been received by the November 1 deadline If an issue is received after the November 1 deadline, it will be included on an agenda if the Committee determines that it is a national “Priority.”

2

Handbook 44 - 2007 Introduction

Criteria for Inclusion in the Committee’s Agenda when no Regional Association has Approved the Issues

(1) Issues must have significant legal impact on weights and measures laws and/or regulations involving:

(a) court cases/attorney general opinions; or

(b) pre-emption by federal statute or regulation; or

(c) conflict with international standards; or

(d) relationship to laws or regulations of an urgent nature which could affect health and safety

(2) The Committee may contact parties that are potentially affected by an issue (e.g., trade associations, industry,

and consumer groups) for comments The Committee may consider these comments and any other information

in determining if the issue should be included on its agenda

(3) When the Committee determines that it should consider an issue as a “Priority” (using the criteria in (1), the

issue will be handled in the following manner:

(a) A “Priority” issue received prior to the Interim Meeting may be added to the Interim Meeting agenda by

majority vote of the Committee

(b) A “Priority” issue received after the Interim Meeting may be added to the Committee’s Annual Meeting

agenda as: (i) a discussion issue by majority vote of the Committee, or (ii) as a voting item by majority vote

of the Committee and the NCWM Board of Directors

I Committee Agenda

a The Committee will review issues that have been submitted and selected by majority vote to be included on its

agenda The Committee will only include those issues that have been (1) approved by at least one of the regional

associations; or (2) forwarded by other committees, subcommittees, NTETC Sectors, task forces, or work

groups, or those issues that meet the criteria in Section H, Exceptions to Policy

b The Committee will publish an agenda which identifies the issues to be discussed during the Interim Meetings

This agenda shall be distributed to members approximately 30 days prior to the meetings The agenda will be

provided upon request to all other interested parties

(Amended 1998)

J Interim Meeting

a The Committee shall hold public hearings at the Interim Meeting for the purpose of discussing and taking

comments on all issues on its agenda

b Upon request, the Committee will provide the opportunity for presentations by government officials, industry

representatives, consumer groups, or other interested parties during the Interim Meeting Requests to make

presentations must be received by the Committee Chairman or Technical Advisor at least two weeks prior to the

start of the meetings

K Interim Meeting Report

a Issues under consideration by the Committee and upon which it offers comments or recommendations for

Conference action during the Annual Meetings, will be included in the Committee’s Interim Reports published

in the Annual Meeting Program and Committee Reports

b The Annual Meeting Program and Committee Reports will be prepared and distributed to Conference members

approximately three months prior to the NCWM Annual Meeting

3