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Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

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Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices NAT L INST. OF STAND & TECH R.I.C. United States Department of Commerce AlllDM T3fi2M7 I 1 National Institute of Standards and Technology NIST reference 4.iillH-lC^TI0N.S, NIST HANDBOOK 44 1990 SPECIFICATIONS, TOLERANCES, AND OTHER TECHNICAL REQUIREMENTS FOR WEIGHING AND MEASURING DEVICES as adopted by the 74th National Conference on Weights and Measures 1989 NATIONAL INSTITUTE OF STANDARDS & TECHNOLOGY Research Information Center rhe National Institute of Standards and" lVcTinSrd^y'^l&*e^aCTish‘?(3'Fy'3!i act of Congress on March 3, 1901. The Institute’s overall goal is to strengthen and advance the Nation’s science and technology and facilitate their effective application for public benefit. To this end, the Institute conducts research to assure interna¬ tional competitiveness and leadership of U.S. industry, science and technology. NIST work involves development and transfer of measurements, standards and related science and technology, in support of continually improving U.S. productivity, product quality and reliability, innovation and underlying science and engineering. The Institute’s technical work is performed by the National Measurement Laboratory, the National Engineering Laboratory, the National Computer Systems Laboratory, and the Institute for Materials Science and Engineering. The National Measurement Laboratory Provides the national system of physical and chemical measurement; • Basic Standards^ coordinates the system with measiarement systems of other nations • Radiation Research and furnishes essential services leading to accurate and uniform • Chemical Physics physical and chemical measurement throughout the Nation’s scientific • Analytical Chemistry community, industry, and commerce; provides advisory and research services to other Government agencies; conducts physical and chemical research; develops, produces, and distributes Standard Reference Materials; provides calibration services; and manages the National Standard Reference Data System. The Laboratory consists of the following centers: The National Engineering Laboratory Provides technology and technical services to the public and private • Computing and Applied sectors to address national needs and to solve national problems; Mathematics conducts research in engineering and applied science in support of these • Electronics and Electrical efforts; builds and maintains competence in the necessary disciplines Engineering^ required to carry out this research and technical service; develops engi¬ • Manufacturing Engineering neering data and measurement capabilities; provides engineering measure¬ • Building Technology ment traceability services; develops test methods and proposes engi¬ • Fire Research neering standards and code changes; develops and proposes new • Chemical Engineering^ engineering practices; and develops and improves mechanisms to transfer results of its research to the ultimate user. The Laboratory consists of the following centers: The National Computer Systems Laboratory Conducts research and provides scientific and technical services to aid • Information Systems Federal agencies in the selection, acquisition, application, and use of Engineering computer technology to improve effectiveness and economy in Govern¬ • Systems and Software ment operations in accordance with Public Law 89-306 (40 U.S.C. 759), Technology relevant Executive Orders, and other directives; carries out this mission • Computer Security by managing the Federal Information Processing Standards Program, • Systems and Network developing Federal ADP standards guidelines, and managing Federal Architecture participation in ADP volimtary standardization activities; provides scien¬ • Advanced Systems tific and technological advisory services and assistance to Federal agencies; and provides the technical foundation for computer-related policies of the Federal Government. The Laboratory consists of the following divisions: The Institute for Materials Science and Engineering Conducts research and provides measurements, data, standards, refer¬ • Ceramics ence materials, quantitative understanding and other technical informa¬ • Fracture and Deformation^ tion fundamental to the processing, structure, properties and perfor¬ • Polymers mance of materials; addresses the scientific basis for new advanced • Metallurgy materials technologies; plans research around cross-cutting scientific • Reactor Radiation themes such as nondestructive evaluation and phase diagram develop¬ ment; oversees Institute-wide technical programs in nuclear reactor radiation research and nondestructive evaluation; and broadly dissem¬ inates generic technical information resulting from its programs. The Institute consists of the following divisions: 'Headquarters and Laboratories at Gaithersburg, MD, unless otherwise noted; mailing address Gaithersburg, MD 20899. 'Some divisions within the center are located at Boulder, CO 80303. ' Located at Boulder, CO, with some elements at Gaithersburg, MD. NIST HANDBOOK 44 1990 (Superseding Handbook 44 - 1989 Edition) SPECIFICATIONS, TOLERANCES, AND OTHER TECHNICAL REQUIREMENTS FOR WEIGHING AND MEASURING DEVICES ADOPTED BY THE 74th NATIONAL CONFERENCE ON WEIGHTS AND MEASURES 1989 Henry V. Oppermann, Editor NOTE: As of 23 August 1988, the National Bureau of Standards (NBS) became the National Institute of Standards and Technology (NIST) when President Reagan signed into law the Omnibus Trade and Competitiveness Act U.S. DEPARTMENT OF COMMERCE, Robert A. Mosbacher, Secretary NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY, Raymond G. Kammer, Acting Director Issued September 1989 National Institute of Standards and Technology Handbook 44, 1990 Edition Natl. Inst. Stand. Technol. Handb. 44, 1990 Ed., 274 pages {Sept. 1989) CODEN: NIHAE2 U.S. GOVERNMENT PRINTING OFFICE WASHINGTON: 1989 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 Aimual Meeting of the National Conference on Weights and Measures. This 1990 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), formerly the National Bureau of Standards (NBS). It includes amendments adopted by the 74th National Conference on Weights and Measures during its Annual Meeting in 1989. 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. Raymond Kammer Acting Director National Institute of Standards and Technology Committee on Specifications and Tolerances of the 74th Conference R. Andersen, New York, Chairman C. Carroll, Massachusetts R. Helmick, Arizona J. Truex, Ohio D. Watson, Texas Past Chairmen of the Committee 8-11 L.A. Fischer, NBS 60 W.S. Watson, CA 12-28 F.S. Holbrook, NBS 61 K.J. Simila, OR 29-38 J.P. McBride, MA 62 W.E. Czaia, ME 39-42 R.E. Meek, IN 63 M.L. Kinlaw, NC 43-44 J.E. Brenton, CA 64 J.A. Bird, NJ 45-47 C.L. Jackson, WI 65 D.A. Guensler, CA 48 T.C. Harris, VA 66 G.A. Delano, MT 49-50 R.E. Meek, IN 67 F.C. Nagele, MI 51-52 G.L. Johnson, KY 68 L.H. DeGrange, MD 53 H.D. Robinson, ME 69 S.A. Colbrook, IL 54-55 R. Rebuffo, NE 70 D.A. Guensler, CA 56-57 D.E. Konsoer, WI 71-72 F. Gerk, NM 58 J.C. Mays, FL 73 K. Butcher, MD 59 T.F. Brink, VT 74 R. Andersen, NY IV OUTLINE OF CONTENTS Page FOREWORD iii 1989 AMENDMENTS (1990 Edition) vii 1989 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 2-39 2.22. Automatic Bulk Weighing Systems 2-49 2.23. Weights 2-57 SECTION 3. 3.30. Liquid-Measuring Devices 3-3 3.31. Vehicle-Tank Meters 3-23 3.32. Liquefied Petroleum Gas and Anhydrous Ammonia Liquid-Measuring Devices 3-33 3.33. Hydrocarbon Gas Vapor-Measuring Devices 3-45 3.34. Cryogenic Liquid-Measuring Devices 3-55 3.35. Milk Meters 3-63 3.36. Water Meters 3-71 SECTION 4. 4.40. Vehicle Tanks Used as Measures 4-3 4.41. Liquid Measures 4-9 4.42. Farm Milk Tanks 4-13 4.43. Measure-Containers 4-19 4.44. Graduates 4-23 4.45. Dry Measures 4-29 4.46. Berry Baskets and Boxes 4-33 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 5-11 5.53. Odometers 5-15 5.54. Taximeters 5-19 5.55. Timing Devices 5-25 5.56. Grain Moisture Meters 5-31 APPENDICES A. Fundamental Considerations A-1 B. Units and Systems of Weights and Measures B-1 C. Tables of Weights and Measures and Tables of Equivalents C-1 D. Definitions D-1 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. VI 1989 AMENDMENTS The following table lists those codes, paragraphs, and pages in which amendments were made by the 74th National Conference on Weights and Measures. In the column headed "Action", these changes are noted as "added", "amended", or "retroactive". Each code, section, or paragraph that has been changed will be noted as "Added 1989" or "Amended 1989". Section Code Paragraph Action Page Number 1.10 General G-A.6. Amended 1-2 G-S.8. Amended 1-7 G-T.l. Amended 1-7 Definition' Amended App. D 2.20. Scales S.1.11. Amended 2-9 S.6.9. Added 2-16 S.6.10., S.6.11. Renumbered' 2-16 N.3., Table 4 Amended 2-20 T.1.9. Amended 2-23 T.N.4.5. Amended 2-28 UR.1.1., Table 7b Amended 2-33 UR.3.7.1. Deleted 2-37 UR.3.8. Added 2-37 Definition' Amended App. D Definition"* Added App. D 2.21 Belt-Conveyor Scales S.1.5. Amended 2-39 S.1.6.
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