BS EN 50402-2005+A1-2008 Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen - Requirements on the functional safety of fix.pdf
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2、combustible or toxicgases or vapours or ofoxygen Requirements on thefunctional safety offixed gas detectionsystemsICS 13.320Electrical apparatus fothe detection andmeasurement ofBRITISH STANDARD BS EN50402:2005+A1:2008Incorporating corrigendum October 2010BS EN 50402:2005+ALicensed Copy: Wang Bin, I
3、SO/EXCHANGE CHINA STANDARDS, 10/02/2011 02:44, Uncontrolled Copy, (c) BSIThis British Standard waspublished under the authorityof the Standards Policy andStrategy Committee on 30 December 2005 BSI 2010ISBN 978 0 580 73240 9Amendments/corrigenda issued since publicationDate Comments30 June 2009 Imple
4、mentation of CENELC amendment A1: 200831 October 2010 Correction of print file errors and addition of page numberingGEL/31, Electrical apparatus for explosive atmospheres, to SubcommitteeGEL/31/19, Gas detectors.A list of organizations represented on this subcommittee can be obtained onrequest to it
5、s secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity fromlegal obligations.1:2008National forewordThis British Standard is the UK implementation
6、of EN 50402:2005+A1:2008.It supersedes BS EN 50402:2005 which is withdrawn.The start and finish of text introduced or a ltered by amendment is indicated inthe text by tags. Tags indicating changes to CENELEC text carry the numberof the CENELEC amendment. For example, text altered by CENELECamendment
7、 A1 is indicated by !“.The UK participation in its preparation was entrusted by Technical CommitteeEUROPEAN STANDARD EN 50402:2005+A1 NORME EUROPENNE EUROPISCHE NORM May 2008 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches K
8、omitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50402:2005 E ICS 13.320 English version Electrical apparatus for the detection and
9、 measurement of combustible or toxic gases or vapours or of oxygen Requirements on the functional safety of fixed gas detection systems Matriel lectrique pour la dtection et la mesure des gaz ou vapeurs combustibles ou toxiques, ou de loxygne Exigences relatives la fonction de scurit des systmes fix
10、es de dtection de gaz Elektrische Gerte fr die Detektion und Messung von brennbaren oder toxischen Gasen und Dmpfen oder Sauerstoff Anforderungen an die funktionale Sicherheit von ortsfesten Gaswarnsystemen This European Standard was approved by CENELEC on 2005-07-01. CENELEC members are bound to co
11、mply 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 lists and bibliographical references concerning such national standards may be obtained on application to the Central S
12、ecretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status
13、as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slova
14、kia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/02/2011 02:44, Uncontrolled Copy, (c) BSIForeword This European Standard was prepared by SC 31-9, Electrical apparatus for the detection and measurement of combustible gases to be
15、used in industrial and commercial potentially explosive atmospheres, of Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres and by the Technical Committee CENELEC TC 216, Gas detectors. The text of the draft was submitted to the formal vote and was approved by CENELEC a
16、s EN 50402 on 200507-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2006-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (d
17、ow) 2008-07-01 _ Foreword to amendment A1 This amendment was prepared by SC 31-9, Electrical apparatus for the detection and measurement of combustible gases to be used in industrial and commercial potentially explosive atmospheres, of Technical Committee CENELEC TC 31, Electrical apparatus for expl
18、osive atmospheres. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A1 to EN 50402:2005 on 2008-03-01. The following dates were fixed: latest date by which the amendment has to be implementedat national level by publication of an identic
19、al national standard or by endorsement (dop) 2009-03-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow) 2011-03-01 _ BS EN 50402:2005+A1:2008 EN 50402:2005+A1:2008Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/02/2011 02:44, Uncontroll
20、ed Copy, (c) BSIContents Clause Page Introduction.5 1 Scope .6 2 Normative references .7 3 Definitions8 4 General requirements.12 4.1 Introduction .12 4.2 Functional safety characteristics of modules13 5 Modules and elements - Characterisation and requirements 15 5.1 General requirements .19 5.2 Gas
21、 sampling21 5.3 Sensor.23 5.4 Signal-transmission 24 5.5 Input of control unit .27 5.6 Signal processing in the control unit .29 5.7 Output of the control unit 32 6 Characterisation of safety requirement 35 6.1 General .35 6.2 Characterisation of safety function .36 6.3 Characterisation of safety in
22、tegrity37 6.4 Determination of SIL-capabilities for a safety function38 6.5 Determination of hardware failure rates for a safety function .41 6.6 Safety performance requirements 42 7 Information requirements 42 7.1 Information delivered by the manufacturer of the gas detection system 42 7.2 Informat
23、ion delivered by the user of the gas detection system.43 8 Validation.43 Annex A (informative) Gas detection systems as part of a safety-related system .44 Annex B (normative) Transformation of the SIL-capabilities of gas detection systems .49 Annex C (normative) Transformation from generic standard
24、 requirements to modules 50 Annex D (normative) Management of functional safety53 Annex E (informative) Determination of SIL-capability of a safety function of the gas detection system55 BS EN 50402:2005+A1:2008 EN 50402:2005+A1:2008- -3Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 10/02/20
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