EN 45501:2015

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Meroslovni vidiki neavtomatskih tehtnicMetrologische Aspekte der nichtselbsttätigen WaagenAspects métrologiques des instruments de pesage à fonctionnement non automatiqueMetrological aspects of non-automatic weighing instruments17.060Merjenje prostornine, mase, gostote, viskoznostiMeasurement of volume, mass, density, viscosityICS:Ta slovenski standard je istoveten z:EN 45501:2015SIST EN 45501:2015en,fr01-april-2015SIST EN 45501:2015SLOVENSKI
STANDARDSIST EN 45501:1995+AC:19961DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 45501
February 2015 ICS 17.100
Supersedes
EN 45501:1992
English Version
Metrological aspects of non-automatic weighing instruments
Aspects métrologiques des instruments de pesage à fonctionnement non automatique
Metrologische Aspekte der nichtselbsttätigen Waagen This European Standard was approved by CENELEC on 30 June 2014. CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN and CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17,
B-1000 Brussels © 2015 CEN/CENELEC All rights of exploitation in any form and by any means reserved worldwide for CEN national Members and for CENELEC Members.
Ref. No. EN 45501:2015 E SIST EN 45501:2015

Contents Foreword . 5 Introduction . 6 Terminology . 7 T.1 General definitions . 7 T.2 Construction of an instrument . 9 T.3 Metrological characteristics of an instrument . 15 T.4 Metrological properties of an instrument. 16 T.5 Indications and errors. 17 T.6 Influences and reference conditions . 22 T.7 Performance test . 22 T.8 Index of terms defined . 22 T.9 Abbreviations and symbols . 24 1 Scope . 27 2 Principles of the European Standard . 27 2.1 Units of measurement . 27 2.2 Principles of the metrological requirements . 27 2.3 Principles of the technical requirements . 27 2.4 Application of requirements . 28 2.5 Terminology . 28 3 Metrological requirements . 28 3.1 Principles of classification . 28 3.2 Classification of instruments . 28 3.3 Additional requirements for multi-interval instruments . 29 3.4 Auxiliary indicating devices . 30 3.5 Maximum permissible errors . 32 3.6 Permissible differences between results . 33 3.7 Test standards . 33 3.8 Discrimination . 34 3.9 Variations due to influence quantities and time . 34 3.10 Type evaluation tests and examinations . 38 4 Technical requirements for self- or semi-self-indicating instruments . 43 4.1 General construction requirements . 43 4.2 Indication of weighing results . 45 4.3 Analog indicating device . 46 4.4 Digital indicating devices . 48 4.5 Zero-setting and zero-tracking devices . 49 4.6 Tare devices . 51 4.7 Preset tare devices . 54 4.8 Locking positions . 55 4.9 Auxiliary verification devices (removable or fixed) . 55 4.10 Selection of weighing ranges on a multiple range instrument . 55 4.11 Devices for selection (or switching) between various load receptors and/or load transmitting devices and various load measuring devices . 56 4.12 “Plus and minus” comparator instruments . 56 4.13 Instruments for direct sales to the public . 56 4.14 Additional requirements for price-computing instruments for direct sales to the public . 58 4.15 Instruments similar to those normally used for direct sales to the public . 60 4.16 Price-labeling instruments . 60 4.17 Mechanical counting instruments with unit-weight receptor . 60 4.18 Additional technical requirements for mobile instruments (see also 3.9.1.1) . 61 4.19 Portable instruments for weighing road vehicles . 62 4.20 Modes of operation . 62 5 Technical requirements for electronic instruments . 63 SIST EN 45501:2015

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5.1 General requirements . 63 5.2 Acting upon significant faults . 63 5.3 Functional requirements . 63 5.4 Performance and span stability tests . 64 5.5 Additional requirements for software-controlled electronic devices . 65 6 Technical requirements for non-self-indicating instruments . 71 6.1 Minimum sensitivity . 71 6.2 Acceptable solutions for indicating devices . 71 6.3 Conditions of construction . 72 6.4 Simple equal arm beam . 73 6.5 Simple 1/10 ratio beam . 73 6.6 Simple sliding poise instruments (steelyards) . 74 6.7 Roberval and Béranger instruments . 75 6.8 Instruments with ratio platforms . 75 6.9 Instruments with a load-measuring device having accessible sliding poises (of the steelyard type) . 76 7 Marking of instruments and modules . 77 7.1 Descriptive Markings . 77 7.2 Other marks . 80 8 Metrological controls . 81 8.1 Liability to metrological controls . 81 8.2 Type approval . 81 8.3 Verification of conformity to type . 81 Annex A (normative) Testing procedures for non-automatic weighing instruments . 83 A.1 Administrative examination (8.2.1) . 83 A.2 Compare construction with documentation (8.2.2) . 83 A.3 Initial examination . 83 A.4 Performance tests . 83 A.5 Influence factors . 92 A.6 Endurance test (3.9.4.3) . 95 Annex B (normative) Additional tests for electronic instruments . 97 B.1 General requirements for electronic instruments under test . 97 B.2 Damp heat, steady state . 97 B.3 Performance tests for disturbances . 97 B.4 Span stability test . 104 Annex C (normative) Testing and Evaluation of indicators and analog data processing devices as modules of non-automatic weighing instruments . 106 C.1 Applicable requirements . 106 C.2 General principles of testing . 107 C.3 Tests . 111 C.4 Evaluation Record . 114 Annex D (normative) Testing and Evaluation of digital data processing devices, terminals and digital displays as modules of non-automatic weighing instruments .
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