BS EN 12405-3-2015 Gas meters Conversion devices Flow computer《气量计 转换装置 流量计算机》.pdf
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1、BSI Standards PublicationBS EN 12405-3:2015Gas meters ConversiondevicesPart 3: Flow computerBS EN 12405-3:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12405-3:2015.The UK participation in its preparation was entrusted to TechnicalCommittee GSE/25, Gas Me
2、ters.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Stan
3、dards Limited 2015ISBN 978 0 580 84180 4ICS 91.140.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2015.Amendments/corrigenda issued since publicatio
4、nDate T e x t a f f e c t e dBS EN 12405-3:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12405-3 December 2015 ICS 91.140.40 English Version Gas meters - Conversion devices - Part 3: Flow computer Compteurs de gaz - Dispositifs de conversion - Partie 3: Calculateurs de dbit Gaszhler - Umw
5、erter - Teil 3: Flowcomputer This European Standard was approved by CEN on 19 September 2015. CEN 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-dat
6、e lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
7、under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Form
8、er 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 andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT E
9、UROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12405-3:2015 EBS EN 12405-3:2015EN 12405-3:2015 (E) 2 Cont
10、ents Page European foreword . 5 Introduction 6 1 Scope 8 2 Normative references 8 3 Terms, definitions and symbols 10 3.1 Terms and definitions 10 3.2 Symbols and subscripts . 16 3.3 Abbreviations 18 3.4 Environmental classification for flow computers 18 3.4.1 Climatic conditions 18 3.4.2 Mechanical
11、 conditions 18 3.4.3 Electrical and Electromagnetic conditions . 18 4 Principle of measurement 18 4.1 General . 18 4.2 Correction functions . 19 4.2.1 General . 19 4.2.2 Correction of the volume at measurement conditions . 20 4.2.3 Temperature and pressure correction of USM body dimension . 23 4.2.4
12、 Temperature and pressure measurement correction for conversion . 23 5 Rated operating conditions 23 5.1 Specified field of measurement . 23 5.1.1 General . 23 5.1.2 Specified measurement range for gas pressure 23 5.1.3 Specified measurement range for gas temperature 24 5.1.4 Gas characteristics . 2
13、4 5.1.5 Base conditions . 24 5.2 Environmental conditions 24 5.2.1 Ambient temperature range 24 5.2.2 Humidity range . 24 5.3 Power supply . 24 6 Construction requirements 25 6.1 General . 25 6.2 Sealing 25 6.3 Time measuring functions 27 6.3.1 Clock 27 6.3.2 Time interval . 27 6.4 Casings . 28 6.5
14、Indications 28 6.5.1 General . 28 6.5.2 Electronic indicating device . 30 6.6 Inputs for volume conversion 30 6.7 Alarms in flow computer . 31 6.7.1 Detection of defective operation situations . 31 BS EN 12405-3:2015EN 12405-3:2015 (E) 3 6.7.2 Handling of volumes during maintenance 31 6.7.3 Memoriza
15、tion of metrological data 31 6.7.4 Handling of alarms . 31 6.8 Specific monitoring functions performed by flow computer 31 6.8.1 General . 31 6.8.2 Turbine Meter health check (Mechanical meter) . 33 6.8.3 USM health check (meter integrity check) 34 6.8.4 Gas analysis devices health check 35 6.8.5 p-
16、T transducer health check . 36 6.8.6 Self check of the Z algorithm . 36 6.8.7 Volume comparison . 36 6.8.8 Gas quality comparison 38 6.9 Cut-off function 38 6.10 Long-term data storage 38 6.10.1 General . 38 6.10.2 Categories of data to be stored 39 6.10.3 Triggers and methods for storage 39 6.10.4
17、Clock-time stamps 40 6.10.5 Security (physical, electronic and software) 40 6.10.6 Error handling . 41 6.10.7 Long term data storage Security audit . 41 7 Installation requirements . 42 7.1 General . 42 7.2 Calculator. 43 7.3 Temperature transducer . 43 7.4 Pressure transducer 43 8 Performance . 44
18、8.1 Reference conditions . 44 8.2 Rated operating conditions . 44 8.3 Maximum permissible errors. 44 8.3.1 General . 44 8.3.2 Global approach: error of main indication 45 8.3.3 Modular approach: specific errors for a FC . 45 8.4 Conditions of matching the constituent elements of a FC 45 8.5 Influenc
19、e factors . 46 8.6 Disturbances . 46 8.7 Durability. 46 8.8 Repeatability 46 8.9 Reliability 46 8.10 Adjustment and calibration of the transducers . 47 9 Tests of conformity 47 9.1 Verification of the construction requirements 47 9.2 Verification of the performance requirements . 48 9.2.1 Test condi
20、tions 48 9.2.2 Samples of FC required for testing . 49 10 Marking 50 11 Installation and operating instructions . 51 Annex A (normative) Type test 52 A.1 General conditions . 52 A.2 Accuracy tests under reference conditions . 54 BS EN 12405-3:2015EN 12405-3:2015 (E) 4 A.3 Effect of ambient temperatu
21、re 55 A.4 Effect of damp heat, steady-state test . 55 A.5 Effect of damp heat, cyclic test . 56 A.6 Electrical power variation 56 A.7 Short time power reductions . 57 A.8 Electrical bursts 58 A.9 Electromagnetic susceptibility 58 A.10 Electrostatic discharges . 59 A.11 Overload of pressure (only for
22、 pressure transducers) 59 A.12 Effect of vibrations . 60 A.13 Effect of shocks 60 A.14 Overload of pressure (mechanical) (only for pressure transducer) . 61 A.15 Durability 61 A.16 Alarms operation . 62 A.17 Repeatability 63 A.18 Short time DC power variations 63 A.19 Surges on supply lines and/or s
23、ignal lines . 64 A.20 Power frequency magnetic field . 64 Annex B (normative) Pressure transducers . 65 B.1 Scope . 65 B.2 Rated operating conditions 65 B.3 Construction requirements 65 B.4 Performances 66 B.5 Tests of conformity 67 B.6 Marking 67 Annex C (normative) Temperature transducers . 68 C.1
24、 Scope . 68 C.2 Rated operating conditions 68 C.3 Construction requirements 68 C.4 Performances 69 C.5 Tests of conformity 70 C.6 Marking 70 Annex D (normative) Requirements and testing of meter error correction . 71 D.1 General . 71 D.2 Verification of the volumetric flow rate determination. 71 D.3
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