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■m NIST NIST REFERENCE PUBLICATIONS United States Department of Commerce Technology Administration National Institute of Standards and SPECIFICATIONS, Technology TOLERANCES, AND OTHER TECHNICAL REQUIREMENTS FOR WEIGHING AND MEASURING DEVICES as adopted by the 80th National Conference on Weights and Measures 1995 NIST A A V Handbook' -1 QC 1996 1 . U51 NO. 44 1996 # he National Institute of Standards and Technology was established in 1988 by Congress to "assist industry -M- in the development of technology .. . needed to improve product quality, to modernize manufacturing processes, to ensure product reliability . . . and to facilitate rapid commercialization ... of products based on new scientific discoveries.” NIST, originally founded as the National Bureau of Standards in 1901, works to strengthen U.S. industry’s competitiveness; advance science and engineering; and improve public health, safety, and the environment. 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CO 80303. 2Some elements at Boulder, CO 80303. Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices as adopted by the 80th National Conference on Weights and Measures 1 995 Editors: U.S. Department of Commerce Tina G. Butcher Ronald H. Brown, Secretary Constantine Cotsoradis Technology Administration Terry L. Grimes Mary L. Good, Under Secretary NIST National Institute of Standards and Office of Weights & Measures Technology Gilbert M. Ugiansky, Ph.D., Chief Arati Prabhakar, Director Gaithersburg, MD 20899 A A NIST Handbook ^"T 1996 Edition (issued January 1996) Supersedes Handbook 44 1995 Edition National Institute of Standards and Technology Handbook 44, 1996 Edition Natl. Inst. Stand. Technol. Handb. 44, 1996 Ed., 247 pages (Jan. 1996) CODEN: NIHAE2 U.S. GOVERNMENT PRINTING OFFICE WASHINGTON: 1996 For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402—9325 Foreword Handbook 44 was first published in 1949, having been preceded by similar handbooks of various designations and in several forms, beginning in 1918. Handbook 44 is published in its entirety each year following the Annual Meeting of the National Conference on Weights and Measures. This 1996 edition was developed by the Committee on Specifications and Tolerances of the National Conference on Weights and Measures, with the assistance of the Office of Weights and Measures of the National Institute of Standards and Technology (NIST). The handbook includes amendments adopted by the 80th National Conference on Weights and Measures during its Annual Meeting in 1995. The National Institute of Standards and Technology 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, the Institute is pleased to publish these recommendations of the National Conference. Arati Prabhakar Director National Institute of Standards and Technology 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 Conference 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 National Conference on Weights and Measures. Committee on Specifications and Tolerances of the 80th Conference Richard Suiter, Nebraska, Chairman Darryl Brown, Iowa Ronald Murdock, North Carolina Robert Kelley, New York City, NY Gary West, New Mexico Renald Marceau, Canada, Technical Advisor Tina Butcher, NIST, Technical Advisor Constantine Cotsoradis, NIST, Technical Advisor Past Chairmen of the Committee Conference Chairman Conference Chairman 8-11 L.A. Fischer, NBS 63 M.L. Kinlaw, NC 12-28 F.S. Holbrook, NBS 64 J.A. Bird, NJ 29-38 J.P. McBride, MA 65 D.A. Guensler, CA 39-42 R.E. Meek, IN 66 G.A. Delano, MT 43-44 J.E. Brenton, CA 67 F.C. Nagele, MI 45-47 C.L. Jackson, WI 68 L.H. DeGrange, MD 48 T.C. Harris, VA 69 S.A. Colbrook, IL 49-50 R.E. Meek, IN 70 D.A. Guensler, CA 51-52 G.L. Johnson, KY 71-72 F. Gerk, NM 53 H.D. Robinson, ME 73 K. Butcher, MD 54-55 R. Rebuffo, NE 74 R. Andersen, NY 56-57 D.E. Konsoer, WI 75 D. Watson, TX 58 J.C. Mays, FL 76 J. Truex, OH 59 T.F. Brink, VT 77 C. Carroll, MA 60 W.S. Watson, CA 78 C. Carroll, MA 61 K.J. Simila, OR 79 J. Jeffries, FL 62 W.E. Czaia, MN 80 R. Suiter, NE IV Outline of Contents Page Foreword iii 1995 Amendments (1996 Edition) vii 1995 Editorial Changes xi Introduction 1 Section 1. 1.10. General Code 1-1 Section 2. 2.20. Scales 2-3 2.21. Belt-Conveyor Scale Systems 2-35 2.22. Automatic Bulk Weighing Systems 2-41 2.23. Weights 2-47 2.24. Automatic Weighing Systems - Tentative Code 2-51 Section 3. 3.30. Liquid-Measuring Devices 3-3 3.31. Vehicle-Tank Meters 3-19 3.32. Liquefied Petroleum Gas and Anhydrous Ammonia Liquid-Measuring Devices 3-27 3.33. Hydrocarbon Gas Vapor-Measuring Devices 3-35 3.34. Cryogenic Liquid-Measuring Devices 3-43 3.35. Milk Meters 3-49 3.36. Water Meters 3-55 3.37. Mass Flow Meters 3-59 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 4-13 4.44. Graduates 4-15 4.45. Dry Measures 4-19 4.46. Berry Baskets and Boxes 4-21 v Outline of Contents (Continued) Section 5. 5.50. Fabric-Measuring Devices 5-3 5.51. Wire- and Cordage-Measuring Devices 5-7 5.52. Linear Measures 5-9 5.53. Odometers 5-11 5.54. Taximeters 5-13 5.55. Timing Devices 5-17 5.56. Grain Moisture Meters 5-21 5.57. Near Infrared Grain Analyzers - Tentative Code 5-29 5.58. Multiple Dimension Measuring Devices - Tentative Code 5-35 Appendices A. Fundamental Considerations A-l B. Units and Systems of Measurement B-l C. General Tables of Units of Measurement C-l D. Definitions D-l vi 1995 Amendments The following table lists the codes, paragraphs and pages in which amendments were made by the 80th National Conference on Weights and Measures. In the column headed "Action," changes are noted as "added," "amended," "deleted," or "renumbered." Each code, section, or paragraph that has been changed will be noted as "Added 1995" or "Amended 1995." Section Code S&T Paragraph Action Page Item No. 1.10. General 310-2 G-S.6. Amended 1-3 310-1 G-UR.1.3. Added 1-5 2.20. Scales 320-2 S. 1.7. Amended 2-5 320-6 S. 1.8.3. Amended 2-6 S.1.8.4. Amended Footnote 320-9 S.2.5.1. Amended 2-9 320-14 S.5.3. Amended 2-10 320-7 UR.l. Footnote Added 2-25 320-10 UR.1.5. Added 2-26 320-3 Table 7a Amended 2-27 2.21. Belt-Conveyor 321-1 UR.2.2.1. Amended 2-39 Scale Systems 2.24. Automatic 360-2 Entire Code Added Tentative 2-51 - Weighing Systems Code 2-61 3.30. Liquid-Measuring 330-6 S.2.2., Amended 3-7 Devices Table S.2.2. - 3-8 Category 2 330-2 S.3.1. Amended 3-9 330-5 T.2.3.1. Amended 3-14 3.31. Vehicle Tank 331-2 AT. Amended 3-19 Meters T.2. Amended 3-23 Tables 3 and 4 Added 3-24 & 25 3.32. LPG and 332-2 S. 1.5.2. Amended 3-28 Anhydrous Ammonia Liquid- Measuring Devices Section Code S&T Paragraph Action Page Item No. 3.34. Cryogenic Liquid- 334-2 A.l. Amended 3-43 Measuring Devices 3.37. Mass Flow Meters 337-2 S.3.3.1. Added 3-61 337-3 S.3.5., Amended 3-61 & Table S.3.5. 3-62 337-1 UR.3.7. Added 3-65 5.56. Grain Moisture 356-1 5.1.1., S.1.2.1., Deleted note 5-21 - 5-28 Meters 5.1.5., S.1.6.1., 5.2.1., S.2.2. 356-1 5.1.2.2., S. 1.6.1., Amended 5-21 - 5-25 Table S. 1.6.1., (Retroactive date 5.1.6.3., removed) S.1.6.4.(b), S.1.10, S.2.3., 5.2.4., S.4, S.5.I., 5.5.2., UR.3.4. 356-2 S.1.2.2.(g) Added 5-21 356-3 S.2.3.(b) Added 5-25 S.2.3. Amended 5-25 5.57. Near Infrared 357-1 S.2.5.1 - note Added 5-31 Grain Analyzers UR.2.8. Amended 5-33 5.58. Multiple 360-1 Entire Code Added 5-35 to Dimension Tentative Code 5-41 Measuring Devices Appendix A Fundamental 360-4 5.2, 6.1, 7.1 Amended A-4 & A-5 Considerations Appendix D Definitions 320-14 Multi-interval Added D-9 scale Multiple range Added D-9 scale Variable division- Deleted D-16 value scale