BS EN 50056-1999 用于易燃性气体的探测和测量－指示空气中甲烷不高于100％（VV）的

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||BRITISHSTANDARDBSEN50056:1999TheEuropeanStandardEN50056:1998hasthestatusofaBritishStandardICS13.320NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWElectricalapparatusforthedetectionandmeasurementofcombustiblegasesÐPerformancerequirementsforGroupIapparatusindicatingupto100%(V/V)methaneinair©BSI01-1999ISBN0580306747AmendmentsissuedsincepublicationAmd.No.DateTextaffectedNationalforewordThisBritishStandardistheEnglishlanguageversionofEN50056:1998.ItsupersedesBSEN50056:1991.The1998editionoftheEuropeanStandardincorporatessomeminormodificationstobringitintoalignmentwiththeNewApproachDirectiveonPotentiallyExplosiveAtmospheres(ATEX).Therearenochangestothetechnicalprovisions.TheUKparticipationinitspreparationwasentrustedbyTechnicalCommitteeGEL/31,Electricalapparatusforexplosiveatmospheres,toSubcommitteeGEL/31/19,Gasdetectors,whichhastheresponsibilityto:Ðaidenquirerstounderstandthetext;ÐpresenttotheresponsibleEuropeancommitteeanyenquiriesontheinterpretation,orproposalsforchange,andkeeptheUKinterestsinformed;ÐmonitorrelatedinternationalandEuropeandevelopmentsandpromulgatethemintheUK.Alistoforganizationsrepresentedonthissubcommitteecanbeobtainedonrequesttoitssecretary.Cross-referencesTheBritishStandardswhichimplementinternationalorEuropeanpublicationsreferredtointhisdocumentmaybefoundintheBSIStandardsCatalogueunderthesectionentitledªInternationalStandardsCorrespondenceIndexº,orbyusingtheªFindºfacilityoftheBSIStandardsElectronicCatalogue.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,theENtitlepage,pages2to5andabackcover.©1998CENELECAllrightsofexploitationinanyformandbyanymeansreservedworldwideforCENELECnationalMembers.Ref.No.EN50056:1998EEUROPEANSTANDARDEN50056NORMEEUROPEÂENNEEUROPAÈISCHENORMJuly1998ICS13.220.60;19.080SupersedesEN50056:1991+A1:1995Descriptors:electricalapparatus,explosiveatmosphere,minesusceptibletofiredamp,detector,measuringapparatus,flammablegas,combustiblegas,characteristicEnglishversionElectricalapparatusforthedetectionandmeasurementofcombustiblegasesÐPerformancerequirementsforGroupIapparatusindicatingupto100%(V/V)methaneinairAppareilseÂlectriquesdedeÂtectionsetdemesuredesgazcombustiblesÐReÁglesdeperformancesdesappareilsduGroupeIpouvantindiquerjusqu'aÁ100%(V/V)demeÂthanedansl'airElektrischeGeraÈtefuÈrdasAufspuÈrenunddieMessungbrennbarerGaseÐAnforderungenandasBetriebsverhaltenvonGeraÈtenderGruppeImiteinemMeûbereichbiszu100%(V/V)MethaninLuftThisEuropeanStandardwasapprovedbyCENELECon12September1996.CENELECmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferencesconcerningsuchnationalstandardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENELECmember.ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).AversioninanyotherlanguagemadebytranslationundertheresponsibilityofaCENELECmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusastheofficialversions.CENELECmembersarethenationalelectrotechnicalcommitteesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom.©BSI01-1999ForewordThissecondeditionoftheEuropeanStandardwaspreparedbySC31-9,Electricalapparatusforthedetectionandmeasurementofcombustiblegases,tobeusedinindustrialandcommercialpotentiallyexplosiveatmospheres,ofTechnicalCommitteeCENELECTC31,Electricalapparatusforexplosiveatmospheres,onthebasisofEN50056:1991,itsamendmentA1:1995andasecondamendment.ThissecondamendmentwasapprovedbyCENELECon1996-12-09forincorporationintoaneweditionofEN50056.ThisEuropeanStandardreplacesEN50056:1991+A1:1995.Thefollowingdateswerefixed:±latestdatebywhichtheENhastobeimplementedatnationallevelbypublicationofanidenticalnationalstandardorbyendorsement(dop)1999-01-01±latestdatebywhichthenationalstandardsconflictingwiththeENhavetobewithdrawn(dow)1999-01-01ThisEuropeanStandardhasbeenpreparedunderamandategiventoCENELECbytheEuropeanCommissionandcoversessentialrequirementsofECDirective94/9/EC.ContentsPage1Scope32Normativereferences33Definitions34Generalrequire