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  • NMI R 81 Dynamic Measuring Devices and Systems for Cryogenic Liquids

    (OIML R 81:1998(E), IDT and OIML R 81:2006(E), IDT) The English versions of international standards OIML R 81:1998 Dynamic Measuring Devices and Systems for Cryogenic Liquids and OIML R 81:2006 Annex D Test Report Format are adopted as an identical national standard with the reference number NMI R 81

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    Commonwealth of Australia 2009

    First edition August 2009

    National Measurement Institute Bradfield Road, Lindfield, NSW 2070 PO Box 264, Lindfield, NSW 2070

    T (61 2) 8467 3600 F (61 2) 8467 3610 W www.measurement.gov.au

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    1. SCOPE

    NMI R 81 provides the metrological and technical requirements, the test procedures and a test report format for measuring devices and systems used for the dynamic measurement of cryogenic liquids used for trade in Australia.

    2. CONTENTS

    NMI R 81 is comprised of the following international recommendations published by the International Organisation of Legal Metrology (OIML):

    OIML R 81. Dynamic Measuring Devices and Systems for Cryogenic Liquids (1998); and

    OIML R 81 Annex D. Test Report Format (1996).

    3. VARIATIONS AND INTERPRETATIONS

    Minor variations apply to NMI R 81and are reproduced in full below. In the electronic pdf version of this publication, hover over (or right click) the highlighted text to view the variation.

    OIML R 117 is equivalent to NMI R 117.

    OIML R 105 is equivalent to NMI R 105.

    Refer to the following bibliography for the most recent edition of each publication.

    IEC 60068-2-1 (2007) Environmental Testing. Part 2-1: Tests Test A: Cold

    IEC 60068-2-2 (2007) Environmental Testing. Part 2-2: Tests. Test B: Dry Heat

    IEC 60068-2-6 (2007) Environmental Testing - Part 2-6: Tests - Test Fc: Vibration (Sinusoidal)

    IEC 60068-2-28 (1990) has been superseded by IEC 60068-3-4 (2001) Environmental Testing. Part 3-4: Supporting Documentation and Guidance Damp Heat Tests. The equivalent Australian standard is AS 60068.3.4 (2003)

    IEC 60068-2-30 (2005) Environmental Testing. Part 2-30: Tests Test Db: Damp Heat, Cyclic (12 h + 12 h Cycle)

    IEC 61000-4-2 (2001) Electromagnetic Compatibility. Part 4-2: Testing and Measurement Techniques Electrostatic Discharge Immunity Test. The equivalent Australian standard is AS/NZS 61000.4.2 (2002)

    IEC 61000-4-4 (2004) Electromagnetic Compatibility. Part 4-4: Testing and Measurement Techniques Electrical Fast Transient/Burst Immunity Test. Also refer to corrigendum 1 (2006). The equivalent Australian standard is AS/NZS 61000.4.4 (2006)

    IEC 61000-4-11 (2004) Electromagnetic Compatibility. Part 4-11: Testing and Measurement Techniques Voltage Dips, Short Interruptions and Voltage Variations Immunity Tests. The equivalent Australian standard is AS/NZS 61000.4.11 (2005)

    ISO 7637-1 (2002) Road Vehicles Electrical Disturbances from Conduction and Coupling. Part 1: Definitions and General Considerations. Also refer to Amendment 1 (2008)

    ISO 7637-2 (2004) Road vehicles Electrical disturbances from conduction and coupling. Part 2: Electrical transient conduction along supply lines only

    International Vocabulary of Metrology Basic and General Concepts and Associated Terms (VIM) 3rd Edition (2007) OIML

  • Dynamic measuring devices and systems for cryogenic liquids

    Dispositifs et systmes de mesure dynamique de liquides cryogniques

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    OIML R 81Edition 1998 (E)

    ORGANISATION INTERNATIONALEDE MTROLOGIE LGALE

    INTERNATIONAL ORGANIZATIONOF LEGAL METROLOGY

    INTERNATIONALRECOMMENDATION

  • OIML R 81: 1998 (E)

    Contents

    Foreword ....................................................................................................................................................................... 3

    SECTION I - GENERAL

    1 Scope .................................................................................................................................................................. 42 Application ......................................................................................................................................................... 43 Terminology ....................................................................................................................................................... 44 Principles of the Recommendation .................................................................................................................. 75 Units of measurement ....................................................................................................................................... 7

    SECTION II - METROLOGICAL REQUIREMENTS

    6 Maximum permissible errors (mpe) ................................................................................................................. 77 Flowrates of a measuring system or a meter ................................................................................................... 78 Minimum measured quantity ........................................................................................................................... 7

    SECTION III - TECHNICAL REQUIREMENTS

    9 Indicating devices (indicators) ......................................................................................................................... 810 Printing devices (printers) ................................................................................................................................. 811 Measuring systems ............................................................................................................................................ 812 Discharge lines and valves ................................................................................................................................ 913 Markings .......................................................................................................................................................... 10

    SECTION IV - MEASURING SYSTEMS EQUIPPED WITH ELECTRONIC DEVICES

    14 Measuring systems equipped with electronic devices ................................................................................... 10

    SECTION V - METROLOGICAL CONTROLS

    15 General requirements ...................................................................................................................................... 1216 Test conditions ................................................................................................................................................. 16

    Annex A Test procedures. Performance tests - general .......................................................................................... 18Annex B Test procedures. Performance tests - applicable to electronic equipment ............................................ 20Annex C Tables of density for liquid argon, helium, hydrogen, nitrogen and oxygen; References ..................... 27

    Bibliography ................................................................................................................................................................ 48

    Printed in France GRANDE IMPRIMERIE DE TROYES130, rue Gnral-de-Gaulle, 10000 Troyes

  • OIML R 81: 1998 (E)

    The International Organization of Legal Metrology(OIML) is a worldwide, intergovernmental organizationwhose primary aim is to harmonize the regulationsand metrological controls applied by the national metro-logical services, or related organizations, of its MemberStates.

    The two main categories of OIML publications are:

    International Recommendations (OIML R), which aremodel regulations that establish the metrologicalcharacteristics required of certain measuring instrumentsand which specify methods and equipment for checkingtheir conformity; the OIML Member States shall imple-ment these Recommendations to the greatest possibleextent;

    International Documents (OIML D), which are inform-ative in nature and intended to improve the work of themetrological services.

    OIML Draft Recommendations and Documents aredeveloped by technical committees or subcommittees whichare formed by the Member States. Certain international andregional institutions also participate on a consultation basis.

    Cooperative agreements are established between OIML andcertain institutions, such as ISO and IEC, with the objective

    of avoiding contradictory requirements; consequently,manufacturers and users of measuring instruments, testlaboratories, etc. may apply simultaneously OIML publica-tions and those of other institutions.

    International Recommendations and International Docu-ments are published in French (F) and English (E) and aresubject to periodic revision.

    This publication - reference OIML R 81, edition 1998 (E) -was developed by the OIML subcommittee TC 8/SC 6Measurement of cryogenic liquids. It was approved for finalpublication by the International Committee of Legal Metro-logy in 1997 and will be submitted to the InternationalConference of Legal Metrology in 2000 for formal sanction.It supersedes the previous edition dated 1989.

    OIML publications may be obtained from the Organizationsheadquarters:

    Bureau International de Mtrologie Lgale11, rue Turgot - 75009 Paris - FranceTelephone: 33 (0)1 48 78 12 82 and 42 85 27 11Fax: 33 (0)1 42 82 17 27E-mail: biml@oiml.org

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    Foreword

  • OIML R 81: 1998 (E)

    Section I

    GENERAL

    1 Scope

    This Recommendation prescribes the metrological andtechnical requirements and test procedures for meas-uring devices and systems used for the dynamic meas-urement of cryogenic liquids.

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