BS EN 50058-1999 用于易燃性气体的探测和测量－指示易燃性气体含量不高于100％（VV

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||BRITISHSTANDARDBSEN50058:1999TheEuropeanStandardEN50058:1998hasthestatusofaBritishStandardICS13.320NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWElectricalapparatusforthedetectionandmeasurementofcombustiblegasesÐPerformancerequirementsforGroupIIapparatusindicatingupto100%(V/V)gas©BSI01-1999ISBN0580306755AmendmentsissuedsincepublicationAmd.No.DateTextaffectedNationalforewordThisBritishStandardistheEnglishlanguageversionofEN50058:1998.ItsupersedesBSEN50058:1991whichiswithdrawn.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.©1998CENELECÐAllrightsofexploitationinanyformandbyanymeansreservedworldwideforCENELECMembers.Ref.No.EN50058:1998EEUROPEANSTANDARDEN50058NORMEEUROPEÂENNEEUROPAÈISCHENORMJuly1998ICS13.220.60;19.080SupersedesEN50058:1991Descriptors:electricalapparatus,explosiveatmosphere,explosiveatmosphereotherthanmines,detector,measuringapparatus,flammablegas,combustiblegas,characteristicEnglishversionElectricalapparatusforthedetectionandmeasurementofcombustiblegasesÐPerformancerequirementsforGroupIIapparatusindicatingupto100%(V/V)gasAppareilseÂlectriquesdedeÂtectionetdemesuredesgazcombustiblesÐReÁglesdeperformancesdesappareilsduGroupeIIpouvantindiquerjusqu'aÁ100%(V/V)degazElektrischeGeraÈtefuÈrdasAufspuÈrenunddieMessungbrennbarerGaseÐAnforderungenandasBetriebsverhaltenvonGeraÈtenderGruppeIImiteinemMeûbereichbiszu100%(V/V)GasThisEuropeanStandardwasapprovedbyCENELECon1April1998.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.©BSI01-1999ForewordThisEuropeanStandardhasbeenpreparedbytheCENELECSubcommitteeSC31-9,Electricalapparatusforthedetectionandmeasurementofcombustiblegasestobeusedinindustrialandcommercialpotentiallyexplosiveatmospheres,ofTechnicalCommitteeCENELECTC31,Electricalapparatusforexplosiveatmospheres.ThetextofthedraftwasapprovedbyCENELECasEN50058on1990-12-10.TheCENELECTechnicalBoardapprovedthepublicationofaneweditionon1998-04-01(D95/079).ThisEuropeanStandardreplacesEN50058:1991.Thefollowingdateswerefixed:±latestdatebywhichtheENhastobeimplementedatnationallevelbypublicationofanidenticalnationalstandardorbyendorsement(dop)1999-01-01±latestdatebywhichthenationalstandardsconflictingwiththeENhavetobewithdrawn(dow)1999-01-01ThisEuropeanStandardhasbeenpreparedunderamandategiventoCENELECbytheEuropeanCommissionandcoversessentialrequirementsofECDirective94/9/EC.ContentsPageForeword21Scope32Normativereferences33Definitions34Generalrequirements35Performancerequirements35.1General3