BS EN 50057-1999 用于易燃性气体的探测和测量－指示爆炸下限不高于100％的II组设备

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||BRITISHSTANDARDBSEN50057:1999TheEuropeanStandardEN50057:1998hasthestatusofaBritishStandardICS13.320NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWElectricalapparatusforthedetectionandmeasurementofcombustiblegasesÐPerformancerequirementsforGroupIIapparatusindicatingupto100%lowerexplosivelimit©BSI01-1999ISBN0580307301AmendmentsissuedsincepublicationAmd.No.DateTextaffectedNationalforewordThisBritishStandardistheEnglishlanguageversionofEN50057:1998.ItsupersedesBSEN50057:1991whichiswithdrawn.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.©1998CENELECAllrightsofexploitationinanyformandbyanymeansreservedworldwideforCENELECMembers.Ref.No.EN50057:1998EEUROPEANSTANDARDEN50057NORMEEUROPEÂENNEEUROPAÈISCHENORMJuly1998ICS13.220.60;19.080SupersedesEN50057:1991Descriptors:electricalapparatus,explosiveatmosphere,explosiveatmosphereotherthanmines,detector,measuringapparatus,flammablegas,combustiblegas,characteristicEnglishversionElectricalapparatusforthedetectionandmeasurementofcombustiblegasesÐPerformancerequirementsforGroupIIapparatusindicatingupto100%lowerexplosivelimitAppareilseÂlectriquesdedeÂtectionetdemesuredesgazcombustiblesÐReÁglesdeperformancedesappareilsduGroupeIIpouvantindiquerjusqu'aÁ100%delalimiteinfeÂrieured'explosiviteÂElektrischeGeraÈtefuÈrdasAufspuÈrenunddieMessungbrennbarerGaseÐAnforderungenandasBetriebsverhaltenvonGeraÈtenderGruppeIImiteinemMeûbereichbiszu100%derunterenExplosiongrenzeThisEuropeanStandardwasapprovedbyCENELECon1April1998.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,Electricalapparatusforthedetectionandmeasurementofcombustiblegases,tobeusedinindustrialandcommercialpotentiallyexplosiveatmospheres,ofTechnicalCommitteeCENELECTC31,Electricalapparatusforexplosiveatmospheres.ThetextofthedraftwasapprovedbyCENELECasEN50057on1990-12-10.TheCENELECTechnicalBoardapprovedthepublicationofaneweditionon1998-04-01(D95/079).ThisEuropeanStandardreplacesEN50057:1991.Thefollowingdateswerefixed:±latestdatebywhichtheENhastobeimplementedatnationallevelbypublicationofanidenticalnationalstandardorbyendorsement(dop)1999-01-01±latestdatebywhichthenationalstandardsconflictingwiththeENhavetobewithdrawn(dow)1999-01-01ThisEuropeanStandardhasbeenpreparedunderamandategiventoCENELECbytheEuropeanCommissionandcoversessentialrequirementsofECDirective94/9/EC.ContentsPageForeword21Scope32Normativereferences33Defini