1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12405-2:2012Gas meters ConversiondevicesPart 2: Energy conversionBS EN 12405-2:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12
2、405-2:2012.The UK participation in its preparation was entrusted to TechnicalCommittee GSE/25, Gas Meters.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
3、 responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 68719 8ICS 91.140.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStan
4、dards Policy and Strategy Committee on 31 August 2012.Amendments issued since publicationDate Text affectedBS EN 12405-2:2012EUROPEAN 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
5、- Dispositifs de conversion - Partie 2 : Conversion en nergie Gaszhler - Umwerter - 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 St
6、andard 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 member. This European Standard exists in three official versions (Engl
7、ish, French, German). A version in any other language made by translation 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,
8、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
9、, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN 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
10、. EN 12405-2:2012: EBS EN 12405-2:2012EN 12405-2:2012 (E) 2 Contents Page Foreword 4Introduction .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 opera
11、ting conditions . 185.1 General . 185.2 Specified field of measurement . 185.3 Environmental conditions 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 determ
12、ination 236.6 Battery powered ECD . 246.7 Security devices and alarms . 246.8 Specific provisions 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 2
13、78.4 Conditions for matching associated measurement instruments (modular approach) . 298.5 Influence 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 construct
14、ion requirements . 319.3 Verification of performance requirements . 3210 Marking 3310.1 General . 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) . 36BS EN 12405-2:2012EN
15、 12405-2:2012 (E) 3 A.1 General conditions 36A.2 EC Performance tests . 37Annex B (normative) 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
16、. 48C.3 Verification of data transmission interface . 48Annex D (normative) Compatibility test 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 Performanc
17、e tests . 51Annex F (normative) Type approval test of the EC/CVDD . 53F.1 General . 53F.2 Performance 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
18、.2 Effect of ambient temperature 63H.3 Effect of damp heat, steady state 63H.4 Cyclic damp heat . 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 varia
19、tions . 69H.11 Surges on supply lines and/or signal lines 69H.12 Power frequency magnetic field 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 . 73Bibl
20、iography 74BS EN 12405-2:2012EN 12405-2:2012 (E) 4 Foreword This document (EN 12405-2:2012) 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
21、identical text or by endorsement, at the latest by January 2013, and conflicting national 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
22、held responsible for identifying any or all such patent rights. EN 12405 consists of the 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 conve
23、rsion (this European Standard); Part 3: Flow computers used as gas meter conversion (in 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 Inte
24、rnal Regulations, the national standards organisations of the following countries are bound 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, I
25、reland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12405-2:2012EN 12405-2:2012 (E) 5 Introduction This introduction presents important concepts used in this standard
26、. Energy conversion systems As an energy conversion device (ECD) comprises a number 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
27、 being fully part of the ECD, and the energy calculator (EC) will have the ability 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 BS EN 12405-2:2012EN 12405-2:2012 (E) 6
28、System 2, where the CVDD may not be locally installed and is considered as an 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 syste
29、m 2. Figure 2 Description of ECD system 2 NOTE The various components of the 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 appro
30、aches In the modular approach, the ECD is an assembly of separate associated 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 o
31、n the associated measuring instrument itself. In this case, the indication shall 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
32、 the energy conversion. The associated measuring instruments are approved for 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 th
33、e type examination certificate provides all the necessary conditions of compatibility 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 tes
34、ting procedures are given in Clause 9. BS EN 12405-2:2012EN 12405-2:2012 (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 + CV
35、DD System 2 VCD/EC (signal CV) VCD + EC (signal CV) Key: VCD: volume conversion 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, verif
36、ied separately BS EN 12405-2:2012EN 12405-2:2012 (E) 8 1 Scope This 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 an
37、d 2nd families according to EN 437. The energy conversion device (ECD) 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
38、to EN 12405-1:2005+A2:2010, or to prEN 12405-3, for high accuracy measurements; 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
39、 of this European Standard, the term “volume conversion devices” (VCDs) 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 th
40、is document and are indispensable for its application. For dated references, 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,
41、Gas meters Conversion devices Part 1: Volume conversion prEN 12405-3, 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-
42、1: Tests Test A: Cold EN 60068-2-2, Environmental testing Part 2-2: 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 equipmen
43、t-type specimens EN 60068-2-47, Environmental testing Part 2-47: Tests 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. BS EN 12405-2:2012EN 12405-2:2012 (E
44、) 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 60068-3-4, Environmental testing Part 3-4: Supporting documentation and guidance Damp heat tests
45、EN 60068-3-8, Environmental testing - Part 3-8: Supporting documentation and guidance Selecting amongst vibration tests EN 60079 (all parts), Explosive atmospheres EN 60529, Degrees of protection provided by enclosures (IP Code) EN 60654-2, Operating conditions for industrial-process measurement and
46、 control equipment Part 2: Power EN 60730-1:2011, Automatic electrical controls for household and similar use Part 1: General requirements EN 60950-1, Information technology equipment - Safety - Part 1: General requirements IEC 61000-2-1, Electromagnetic compatibility (EMC) Part 2: Environment Secti
47、on 1: Description of the environment electromagnetic environment for low-frequency conducted disturbances and signalling in public power supply systems EN 61000-2-2, Electromagnetic compatibility (EMC) Part 2-2: Environment Compatibility levels for low-frequency conducted disturbances and signalling
48、 in public low-voltage power supply systems EN 61000-4-1, Electromagnetic compatibility (EMC) - Part 4-1: Testing and measurement techniques Overview of IEC 61000-4 series EN 61000-4-2, Electromagnetic compatibility (EMC) Part 4-2: Testing and measurement techniques Electrostatic discharge immunity test EN 61000-4-3, Electromagnetic compatibility (EMC) Part 4-3: Testing and measurement techniques Radiated, Radio frequency, electromagnetic field immunit
