《BS-EN-12405-2002.pdf》由会员分享,可在线阅读,更多相关《BS-EN-12405-2002.pdf(60页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 12405:2002 Gas meters Gas-volume electronic conversion devices The European Standard EN 12405:2002 has the status of a British Standard ICS 91.140.40 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 10:05:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 12405:2002 T
2、his British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 24 July 2002 BSI 24 July 2002 ISBN 0 580 40139 1 National foreword This British Standard is the
3、official English language version of EN 12405:2002. It supersedes BS 4161-8:1987 and BS 4161-7:1973 which are withdrawn. The UK participation in its preparation was entrusted to Technical Committee GSE/25, Gas meters, which has the responsibility to: A list of organizations represented on this commi
4、ttee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “S
5、earch” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal
6、 obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Sum
7、mary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 56, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComment
8、s Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 10:05:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12405 July 2002 ICS 91.140.40 English version Gas meters - Gas-volume electronic conversion devices Compteurs de gaz - Dispositifs lectron
9、iques de conversion de volume de gaz Gaszhler - Elektronische Zustands-Mengenumwerter This European Standard was approved by CEN on 25 March 2002. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of
10、a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version i
11、n any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Ger
12、many, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2002 CEN
13、All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12405:2002 E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 10:05:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12405:2002 (E) 2 Contents page Foreword4 1Scope 5 2Normative ref
14、erences 5 3Terms, definitions and symbols.6 3.1Terms and definitions6 3.2Symbols9 4Principle of measurement.11 4.1Conversion as a function of temperature11 4.2Conversion as a function of pressure and temperature11 4.3Conversion as a function of pressure, temperature and deviation from the ideal gas
15、law.12 4.4Correction of the volume at measurement conditions 12 5Rated operating conditions 13 5.1Specified field of measurement13 5.1.1Specified measurement range for gas pressure 13 5.1.2Specified measurement range for gas temperature.13 5.1.3Gas characteristics13 5.2Environmental class13 5.2.1Amb
16、ient temperature range13 5.2.2Humidity range.13 5.3Power supply14 6Construction requirements.14 6.1General14 6.2Casings.15 6.3Indications15 6.3.1General15 6.3.2Electronic indicating device .16 6.4Inputs for volume conversion.17 6.5Battery powered conversion device 17 6.6Security devices and alarms.1
17、8 7Installation requirements18 7.1General18 7.2Temperature transducer19 7.3Pressure transducer19 8Performance.19 8.1Reference conditions 19 8.2Rated operating conditions 19 8.3Maximum permissible errors20 8.3.1Error of conversion20 8.3.2Specific errors for a gas-volume conversion device, type 2.20 8
18、.4Influence factors 21 8.5Disturbances 21 8.6Durability.22 9Tests of conformity22 9.1Test conditions 22 9.2Tests and their classification22 9.3Sample of gas volume conversion device required for testing22 9.4Test report 23 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 10:05:57 GMT+00:00 200
19、6, Uncontrolled Copy, (c) BSI EN 12405:2002 (E) 3 10Marking.23 Annex A (normative) Type test .24 A.1General conditions 24 A.2Accuracy tests under reference conditions26 A.3Effect of ambient temperature27 A.4Effect of damp heat, steady state test.27 A.5Effect of damp heat, cyclic test28 A.6Electrical
20、 power variation .29 A.7Short time power interruption29 A.8Electrical bursts.30 A.9Electromagnetic immunity31 A.10Electrostatic discharges .32 A.11Effect of an overload of pressure.33 A.12Mechanical resistance to overload of pressure .33 A.13Effect of vibrations 34 A.14Effect of shocks.35 A.15Durabi
21、lity 35 Annex B (informative) Model type test report37 B.1General37 B.2Accuracy tests under reference conditions38 B.3Ambient temperature.39 B.4Effect of damp heat, steady state test.42 B.5Effect of damp heat, cyclic test43 B.6Electrical power variation .45 B.7Short time power interruption48 B.8Elec
22、trical bursts.48 B.9Electromagnetic immunity49 B.10Electrostatic discharges .50 B.11Effect of an overload of static pressure50 B.12Mechanical resistance to overload of static pressure.51 B.13Effect of vibrations 52 B.14Effect of shocks.52 B.15Durability 53 Bibliography56 Licensed Copy: sheffieldun s
23、heffieldun, na, Sat Oct 28 10:05:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12405:2002 (E) 4 Foreword This document EN 12405:2002 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 nat
24、ional standard, either by publication of an identical text or by endorsement, at the latest by January 2003, and conflicting national standards shall be withdrawn at the latest by January 2003. In the preparation of this European Standard, the content of OIML Publication, “International Document 11”
25、, “International Recommendations 6” and “International Recommendations 32” and the content of member bodies national standards on gas-volume electronic conversion devices have been taken into account. The metrological aspects of this European Standard may be subject to amendments to bring it into li
26、ne with the proposed Measuring Instruments Directive (MID). Annex A is normative and annex B is informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Repub
27、lic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 10:05:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12405:2002 (E) 5
28、 1 Scope This European Standard specifies the requirements and tests for the construction, performance, safety and conformity of gas-volume electronic conversion devices associated to gas meters, used to measure volumes of fuel gases of the 1st and 2nd families according to EN 437. Only three kinds
29、of conversion are treated in this standard: conversion as a function of temperature only (called T conversion); conversion as a function of the pressure and of the temperature with constant compressibility factor (called PT conversion); conversion as a function of the pressure, the temperature and t
30、aking into account the compressibility factor (called PTZ conversion). These gas-volume conversion devices consist of a calculator and a temperature transducer or a calculator, a temperature transducer and a pressure transducer locally installed. Any conversion device can provide an error curve corr
31、ection for a gas meter. NOTEWhen rendering an account to an end user the readings from the conversion device can be used in conjunction with the readings from a gas meter conforming to EN 1359, prEN 12480, or prEN 12261, as appropriate, or to any other appropriate and relevant international or natio
32、nal standard for gas meters, without prejudice of national regulations. This standard is intended for type testing. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate pl
33、aces in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication re
34、ferred to applies (including amendments). EN 437, Test gases - Test pressures - Appliance categories. EN 1776, Gas supply systems - Natural gas measuring stations - Functional requirements. EN 50014, Electrical apparatus for potentially explosive atmospheres - General requirements. EN 50015, Electri
35、cal apparatus for potentially explosive atmospheres - Oil immersion “o“. EN 50016, Electrical apparatus for potentially explosive atmospheres - Pressurized apparatus “p“. EN 50017, Electrical apparatus for potentially explosive atmospheres - Powder filling “q“. EN 50018, Electrical apparatus for pot
36、entially explosive atmospheres - Flameproof enclosure “d“. EN 50019, Electrical apparatus for potentially explosive atmospheres - Increased safety “e“. EN 50020, Electrical apparatus for potentially explosive atmospheres - Intrinsic safety “i“. EN 50039, Electrical apparatus for potentially explosiv
37、e atmospheres - Intrinsically safe electrical systems. EN 55011, Industrial, scientific and medical (ISM) radio-frequency equipment - Radio disturbance characteristics - Limits and methods of measurement (CISPR 11:1997, modified). Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 10:05:57 GMT+0
38、0:00 2006, Uncontrolled Copy, (c) BSI EN 12405:2002 (E) 6 EN 60068-2-1, Environmental testing - Part 2: tests - Tests A: Cold (IEC 60068-2-1:1990). EN 60068-2-2, Basic environmental testing procedures - Part 2: Tests - Tests B: Dry heat (IEC 60068-2-2:1974 + IEC 68-2-2A:1976). EN 60068-2-30, Environ
39、mental testing - Part 2: Tests - Test Db and guidance: Damp heat, cyclic (12 + 12 hour cycle) (IEC 60068-2-30:1980 + A1:1985). EN 60068-2-31, Basic environmental testing procedures - Part 2: Tests - Test Ec: Drop and topple, primarily for equipment-type specimens (IEC 60068-2-31:1969 + A1:1982). EN
40、60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989). EN 60950, Safety of information technology equipment. EN 61000-4-2, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 2: Electrostatic discharge immunity test - Basic EMC publicat
41、ion (IEC 61000-4-2:1995). EN 61000-4-3, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 3: Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:1995, modified). EN 61000-4-4, Electromagnetic compatibility (EMC) - Part 4: Testing and
42、 measurement techniques - Section 4: Electrical fast transient/burst immunity test - Basic EMV publication (IEC 61000-4-4:1995). EN 61000-4-6, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 6: Immunity to conducted disturbances, induced by radio-frequency
43、fields (IEC 61000-4-6:1996). ISO 12213-1, Natural gas - Calculation of compression factor - Part 1: Introduction and guidelines. ISO 12213-2, Natural gas - Calculation of compression factor - Part 2: Calculation using molar composition analysis. ISO 12213-3, Natural gas - Calculation of compression
44、factor - Part 3: Calculation using physical properties. IEC 60068-2-3, Basic environmental testing procedures - Part 2: Tests - Test Ca: Damp heat, steady state. 3 Terms, definitions and symbols 3.1 Terms and definitions For the purpose of this European Standard, the following terms and definitions
45、apply. 3.1.1 gas-volume conversion device device that computes, integrates and indicates the volume increments measured by a gas meter if it were operating at base conditions, using as inputs the volume at measurement conditions as measured by the gas meter, and other parameters such as gas temperat
46、ure and gas pressure NOTEThe conversion device can also compensate for the error curve of a gas meter and associated measuring transducers. NOTEThe deviation from the ideal gas law can be compensated by the compressibility factor. 3.1.1.1 conversion device type 1 (complete system) conversion device
47、with a specific type of transducer for temperature and/or pressure. The assessment of errors of conversion are based on the overall conversion factor Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 10:05:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12405:2002 (E) 7 3.1.1.2 conversion devi
48、ce type 2 (separate component) conversion device with external approved transducers for temperature and/or pressure and separate calculator. The assessment of errors of conversion are based on the individual transducer and calculator errors 3.1.2 measurement conditions conditions of the gas whose vo
49、lume is measured at the point of measurement (e.g. the temperature and the pressure of the gas) 3.1.3 base conditions fixed conditions used to express the volume of gas independently of the measurement conditions EXAMPLEStemperature of 273,15 K and absolute pressure of 1,013 25 bar 1 or temperature of 288,15 K and absolute pressure of 1,013 25 bar. 3.1.4 sensor element of a measuring instrument or measuring chain that is directly affected by the measurand 3.1.5 measuring transducer device th
链接地址:https://www.31doc.com/p-3738578.html