1、October 2012 Translation by DIN-Sprachendienst.English price group 24No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 91.140.40!$|a“1918962www.din.deDDIN EN 12405-2Gas meters Conversion devices Part 2: Energy conversion;English version EN 12405-2:2012,English translation of DIN EN 12405-2:2012-10Gaszhler Umwerter Teil 2: Energieumwertung;Englische Fassung EN 12405-2:2012,Englische bersetzung von DIN EN 12405-2:20
3、12-10Compteurs gaz Dispositifs de conversion Partie 2: Conversion en nergie;Version anglaise EN 12405-2:2012,Traduction anglaise de DIN EN 12405-2:2012-10www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 76pages09.12 DIN EN 12405-2:2012-1
4、0 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 237 “Gas meters” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Gastechnik (Gas Technology Standards Committ
5、ee), Working Committee NA 032-02-05 AA Gasmessung. DIN EN 12405 consists of the following parts, under the general title Gas meters Conversion devices: Part 1: Volume conversion Part 2: Energy conversion Part 3: Flow computers used as gas meter conversion (in preparation) During the development of t
6、his European Standard, the content of OIML Publication, “Recommendation 140 Measuring systems for gaseous fuel”, has been taken into account. Part 2 of this European Standard specifies the requirements and tests for the construction, performance, safety and conformity of conversion devices used to d
7、etermine the energy of fuel gases described in Table 1, including those of the 1st and 2nd families according to EN 437. It is intended to include this standard in the body of technical rules and standards for gas issued by the DVGW Deutscher Verein des Gas- und Wasserfaches e.V. (German Technical a
8、nd Scientific Association for Gas and Water). EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12405-2 July 2012 ICS 91.140.40 English Version Gas meters - Conversion devices - Part 2: Energy conversion Compteurs gaz - Dispositifs de conversion - Partie 2 : Conversion en nergie Gaszhler - Umwert
9、er - Teil 2: Energieumwertung This European Standard was approved by CEN on 9 June 2012. 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-date lis
10、ts 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 under
11、 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, Former Yu
12、goslav 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 STANDARDIZATION COMIT EUROP
13、EN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12405-2:2012: EEN 12405-2:2012 (E) 2 Contents Page Foreword 4Introduction
14、.51 Scope 82 Normative references 83 Terms, definitions and symbols 103.1 Terms and definitions 103.2 Symbols and subscripts 143.3 Classification . 154 Principles of energy determination. 165 Rated operating conditions . 185.1 General . 185.2 Specified field of measurement . 185.3 Environmental cond
15、itions 185.4 Power supply . 196 Construction requirements 196.1 General . 196.2 General (including software) . 196.3 Casings (and sealing) . 216.4 Indications . 216.5 Inputs and outputs for energy determination 236.6 Battery powered ECD . 246.7 Security devices and alarms . 246.8 Specific provisions
16、 applicable to gas chromatographs . 257 Installation requirements . 267.1 General . 267.2 CVDD 268 Metrological requirements . 278.1 Reference conditions . 278.2 Rated operating conditions . 278.3 MPEs 278.4 Conditions for matching associated measurement instruments (modular approach) . 298.5 Influe
17、nce factor tests 298.6 Disturbance tests 298.7 Verification of data transmission interfaces 308.8 CVDD metrological requirements . 309 Tests of conformity. 309.1 General . 309.2 Verification of construction requirements . 319.3 Verification of performance requirements . 3210 Marking 3310.1 General .
18、 3310.2 Marking of energy calculator (or ECD) . 3310.3 Marking of CVDD. 3411 Installation and operating instructions 35Annex A (normative) Type test of the energy calculator (EC) . 36DIN EN 12405-2:2012-10 EN 12405-2:2012 (E) 3 A.1 General conditions 36A.2 EC Performance tests . 37Annex B (normative
19、) Type test of the calorific value determination device (CVDD) . 40B.1 Scope 40B.2 Performances tests . 40Annex C (normative) Type approval tests of volume conversion device (VCD) . 48C.1 Scope 48C.2 General . 48C.3 Verification of data transmission interface . 48Annex D (normative) Compatibility te
20、st for the set of VCD + CVDD + EC 49D.1 Objective. 49D.2 Procedure . 49D.3 Acceptance criteria . 49Annex E (normative) Type approval test of the VCD/EC . 50E.1 General . 50E.2 Test procedures 50E.3 Performance tests . 51Annex F (normative) Type approval test of the EC/CVDD . 53F.1 General . 53F.2 Pe
21、rformance tests . 53Annex G (normative) Type approval test of the VCD/EC/CVDD . 58G.1 General . 58G.2 Performance tests . 58Annex H (normative) Environmental influences (test procedures) . 63H.1 General . 63H.2 Effect of ambient temperature 63H.3 Effect of damp heat, steady state 63H.4 Cyclic damp h
22、eat . 64H.5 Electrical power variation . 65H.6 Short time AC power reductions . 66H.7 Electrical bursts . 67H.8 Electromagnetic susceptibility 67H.9 Electrostatic discharges . 68H.10 Short time DC power variations . 69H.11 Surges on supply lines and/or signal lines 69H.12 Power frequency magnetic fi
23、eld 70H.13 Random vibrations 70H.14 Shocks 71H.15 Durability 72Annex I (normative) Testing of the data transmission interface of ECD. 73I.1 General . 73I.2 Data transmission interface tests procedure . 73Bibliography 74DIN EN 12405-2:2012-10 EN 12405-2:2012 (E) 4 Foreword This document (EN 12405-2:2
24、012) has been prepared by Technical Committee CEN/TC 237 “Gas meters”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2013, and conflicting nation
25、al standards shall be withdrawn at the latest by January 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. EN 12405 consists of th
26、e following parts: Part 1: Volume conversion (and its amendments EN12405-1/A1 and EN 12405-1+A2 to allow the harmonisation of the standard with the Measuring Instruments Directive 2004/22/EC); Part 2: Energy conversion (this European Standard); Part 3: Flow computers used as gas meter conversion (in
27、 preparation). In the preparation of this European Standard, the content of OIML Publication, “Recommendation 140 measuring systems for gaseous fuel”, has been taken into account. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are b
28、ound to implement this European Standard: 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, Portu
29、gal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 12405-2:2012-10 EN 12405-2:2012 (E) 5 Introduction This introduction presents important concepts used in this standard. Energy conversion systems As an energy conversion device (ECD) comprises a numbe
30、r of different components and functions, for the purpose of this Standard, two different systems are considered: System 1, where the calorific value determination device (CVDD) is locally installed and is considered as being fully part of the ECD, and the energy calculator (EC) will have the ability
31、 to utilise a signal generated by this locally installed CVDD for determining energy. Figure 1 shows the various components of ECD system 1. Figure 1 Description of ECD system 1 DIN EN 12405-2:2012-10 EN 12405-2:2012 (E) 6 System 2, where the CVDD may not be locally installed and is considered as an
32、 external transducer of the system, and the calculator will have the ability to accept fixed or periodically updated signals for the calorific value for determining energy. Figure 2 shows the various components of ECD system 2. Figure 2 Description of ECD system 2 NOTE The various components of the
33、ECD need to be supplied as a matched, ready-foruse, set of devices; this applies to System 1 and System 2, and mechanically integrated or separated devices (see modular and global approaches below). Modular and global approaches In the modular approach, the ECD is an assembly of separate associated
34、measuring instruments (VCD and CVDD) and an energy calculator (EC), which are verified separately. Each instrument is verified according to its testing procedure, using the indication available on the energy calculator or on the associated measuring instrument itself. In this case, the indication sh
35、all correspond to the one which is directly processed in energy conversion. The verification of calculation consists in verifying the calculation concerning each characteristic quantity of the gas and/or the calculation for the energy conversion. The associated measuring instruments are approved for
36、 a type or some types of conversion device(s) in order to ensure the compatibility of the association. If the associated measuring instruments deliver a digital signal, they may be considered as interchangeable, provided the type examination certificate provides all the necessary conditions of compa
37、tibility with the calculator of the conversion device. In the global approach, the ECD is tested as a package, performing tests of the following functions: energy calculation, volume conversion and CV determination. The testing procedures are given in Clause 9. DIN EN 12405-2:2012-10 EN 12405-2:2012
38、 (E) 7 For the purpose of this standard, the following configurations of devices are accepted: Table 1 Description of systems 1 and 2 Global approach modular approach System 1 VCD/CVDD/EC VCD + CVDD/EC VCD/EC + CVDDVCD + EC + CVDD System 2 VCD/EC (signal CV) VCD + EC (signal CV) Key: VCD: volume con
39、version device CVDD: calorific value determination device EC: energy calculator X/Y: devices X and Y mechanically integrated, able to perform their functions separately X+Y: devices X and Y exchanging signals between them, verified separately DIN EN 12405-2:2012-10 EN 12405-2:2012 (E) 8 1 Scope This
40、 European Standard specifies the requirements and tests for the construction, performance, safety and conformity of conversion devices used to determine the energy of fuel gases described in the Table 1, including those of the 1st and 2nd families according to EN 437. The energy conversion device (E
41、CD) considered in this standard consists of an energy calculator (EC) and is associated with the following devices and/or functions: a volume conversion device (VCD) or a flow computer used as gas meter conversion, either conforming to EN 12405-1:2005+A2:2010, or to prEN 12405-3, for high accuracy m
42、easurements; a calorific value determination device (CVDD). Requirements for type approval tests of the devices, not included in the above-mentioned standards are described in appropriate annexes specified in Table 6. For the purpose of this European Standard, the term “volume conversion devices” (V
43、CDs) includes flow computers (FCs). A single calculator may undertake the volume conversion functions for different metering lines. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated re
44、ferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 437, Test gases - Test pressures - Appliance categories. EN 12405-1:2005+A2:2010, Gas meters Conversion devices Part 1: Volume conversion prEN 12405-
45、3, Gas meters Conversion devices Part 3: Flow computers1)EN 55011, Industrial, scientific and medical equipment Radio-frequency disturbance characteristics Limits and methods of measurement EN 60068-2-1, Environmental testing Part 2-1: Tests Test A: Cold EN 60068-2-2, Environmental testing Part 2-2:
46、 Tests Test B: Dry heat EN 60068-2-30, Environmental testing Part 2-30: Tests Test Db: Damp heat, cyclic (12 h + 12 h cycle) EN 60068-2-31, Environmental testing Part 2-31: Tests Test Ec: Rough handling shocks, primarily for equipment-type specimens EN 60068-2-47, Environmental testing Part 2-47: Te
47、sts Mounting of specimens for vibration, impact and similar dynamic tests EN 60068-2-64, Environmental testing Part 2-64: Tests Test Fh: Vibration, broadband random and guidance 1) In preparation. DIN EN 12405-2:2012-10 EN 12405-2:2012 (E) 9 EN 60068-2-78, Environmental testing Part 2-78: Tests Test Cab: Damp heat, steady state EN 60068-3-1, Environmental testing Part 3-1: Supporting documentation and guidance Cold and dry heat tests EN 6
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