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 4g3Introduction .5g31g3 Scope 8g32g3 Normative references 8g33g3 Terms, definitions and symbols 10g33.1g3 Terms and definitions 10g33.2g3 Symbols and subscripts 14g33.3g3 Classification . 15g34g3 Principles of energy
11、determination. 16g35g3 Rated operating conditions . 18g35.1g3 General . 18g35.2g3 Specified field of measurement . 18g35.3g3 Environmental conditions 18g35.4g3 Power supply . 19g36g3 Construction requirements 19g36.1g3 General . 19g36.2g3 General (including software) . 19g36.3g3 Casings (and sealing
12、) . 21g36.4g3 Indications . 21g36.5g3 Inputs and outputs for energy determination 23g36.6g3 Battery powered ECD . 24g36.7g3 Security devices and alarms . 24g36.8g3 Specific provisions applicable to gas chromatographs . 25g37g3 Installation requirements . 26g37.1g3 General . 26g37.2g3 CVDD 26g38g3 Me
13、trological requirements . 27g38.1g3 Reference conditions . 27g38.2g3 Rated operating conditions . 27g38.3g3 MPEs 27g38.4g3 Conditions for matching associated measurement instruments (modular approach) . 29g38.5g3 Influence factor tests 29g38.6g3 Disturbance tests 29g38.7g3 Verification of data trans
14、mission interfaces 30g38.8g3 CVDD metrological requirements . 30g39g3 Tests of conformity. 30g39.1g3 General . 30g39.2g3 Verification of construction requirements . 31g39.3g3 Verification of performance requirements . 32g310g3 Marking 33g310.1g3 General . 33g310.2g3 Marking of energy calculator (or
15、ECD) . 33g310.3g3 Marking of CVDD. 34g311g3 Installation and operating instructions 35g3Annex A (normative) Type test of the energy calculator (EC) . 36g3BS EN 12405-2:2012EN 12405-2:2012 (E) 3 A.1g3 General conditions 36g3A.2g3 EC Performance tests . 37g3Annex B (normative) Type test of the calorif
16、ic value determination device (CVDD) . 40g3B.1g3 Scope 40g3B.2g3 Performances tests . 40g3Annex C (normative) Type approval tests of volume conversion device (VCD) . 48g3C.1g3 Scope 48g3C.2g3 General . 48g3C.3g3 Verification of data transmission interface . 48g3Annex D (normative) Compatibility test
17、 for the set of VCD + CVDD + EC 49g3D.1g3 Objective. 49g3D.2g3 Procedure . 49g3D.3g3 Acceptance criteria . 49g3Annex E (normative) Type approval test of the VCD/EC . 50g3E.1g3 General . 50g3E.2g3 Test procedures 50g3E.3g3 Performance tests . 51g3Annex F (normative) Type approval test of the EC/CVDD
18、. 53g3F.1g3 General . 53g3F.2g3 Performance tests . 53g3Annex G (normative) Type approval test of the VCD/EC/CVDD . 58g3G.1g3 General . 58g3G.2g3 Performance tests . 58g3Annex H (normative) Environmental influences (test procedures) . 63g3H.1g3 General . 63g3H.2g3 Effect of ambient temperature 63g3H
19、.3g3 Effect of damp heat, steady state 63g3H.4g3 Cyclic damp heat . 64g3H.5g3 Electrical power variation . 65g3H.6g3 Short time AC power reductions . 66g3H.7g3 Electrical bursts . 67g3H.8g3 Electromagnetic susceptibility 67g3H.9g3 Electrostatic discharges . 68g3H.10g3 Short time DC power variations
20、. 69g3H.11g3 Surges on supply lines and/or signal lines 69g3H.12g3 Power frequency magnetic field 70g3H.13g3 Random vibrations 70g3H.14g3 Shocks 71g3H.15g3 Durability 72g3Annex I (normative) Testing of the data transmission interface of ECD. 73g3I.1g3 General . 73g3I.2g3 Data transmission interface
21、tests procedure . 73g3Bibliography 74g3BS 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,
22、either by publication of an 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
23、and/or CENELEC shall not be 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/
24、22/EC); Part 2: Energy conversion (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. Accor
25、ding to the CEN/CENELEC Internal 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,
26、 Greece, Hungary, Iceland, Ireland, 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 co
27、ncepts used in this standard. 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 in
28、stalled and is considered as 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-
29、2:2012EN 12405-2:2012 (E) 6 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 var
30、ious components of ECD system 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 belo
31、w). Modular and global approaches 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 o
32、n the energy calculator or on 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 ga
33、s and/or the calculation for 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
34、interchangeable, provided the 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 a
35、nd CV determination. The testing 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/E
36、C VCD/EC + CVDDVCD + EC + CVDD 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
37、 signals between them, verified 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, i
38、ncluding those of the 1st and 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 co
39、nversion, either conforming 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
40、 in Table 6. For the purpose 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
41、normatively referenced in this 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 categorie
42、s. EN 12405-1:2005+A2:2010, 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, E
43、nvironmental testing Part 2-1: 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 sh
44、ocks, primarily for equipment-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 12
45、405-2:2012EN 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 60068-3-4, Environmental testing Part 3-4: Supporting documentation a
46、nd guidance Damp heat tests 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 indust
47、rial-process measurement and 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 (EM
48、C) Part 2: Environment Section 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
49、 disturbances and signalling 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
