BS EN 50055-1999 用于易燃性气体的探测和测量－指示空气中甲烷不高于5％（VV）的I组

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||BRITISHSTANDARDBSEN50055:1999TheEuropeanStandardEN50055:1998hasthestatusofaBritishStandardICS13.320NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWElectricalapparatusforthedetectionandmeasurementofcombustiblegasesÐPerformancerequirementsforGroupIapparatusindicatingupto5%(V/V)methaneinair©BSI05-1999ISBN0580306712BSEN50055:1999AmendmentsissuedsincepublicationAmd.No.DateTextaffectedNationalforewordThisBritishStandardistheEnglishlanguageversionofEN50055:1998.ItsupersedesBSEN50055:1991whichiswithdrawn.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.EN50055:1998EEUROPEANSTANDARDEN50055NORMEEUROPEÂENNEEUROPAÈISCHENORMJuly1998ICS13.220.60;19.080Descriptors:Electricalapparatus,explosiveatmosphere,minesusceptibletofiredamp,detector,measuringapparatus,flammablegas,combustiblegas,characteristicEnglishversionElectricalapparatusforthedetectionandmeasurementofcombustiblegasesÐPerformancerequirementsforGroupIapparatusindicatingupto5%(V/V)methaneinairAppareilseÂlectriquesdedeÂtectionetdemesuredesgazcombustiblesÐReÂglesdeperformancesdesappareilsduGroupeIpouvantindiquerjusqu'aÁ5%(V/V)demeÂthanedansl'airElektrischeGeraÈtefuÈrdasAufspuÈrenunddieMessungbrennbarerGaseÐAnforderungenandasBetriebsverhaltenvonGeraÈtenderGruppeImiteinemMeûbereichbiszu5%(V/V)MethaninLuftThisEuropeanStandardwasapprovedbyCENELECon12September1996.CENELECmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferencesconcerningsuchnationalstandardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENELECmember.ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).AversioninanyotherlanguagemadebytranslationundertheresponsibilityofaCENELECmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusastheofficialversions.CENELECmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom.©BSI05-1999ForewordThissecondeditionoftheEuropeanStandardwaspreparedbySC31-9,Electricalapparatusforthedetectionandmeasurementofcombustiblegasestobeusedinindustrialandcommercialpotentiallyexplosiveatmospheres,ofTechnicalCommitteeCENELECTC31,Electricalapparatusforexplosiveatmosphere,onthebasisofEN50055:1991,itsamendmentA1:1995andasecondamendment.ThissecondamendmentwasapprovedbyCENELECon1996-12-09forincorporationintoaneweditionofEN50055.ThisEuropeanStandardreplacesEN50055:1991+A1:1995.Thefollowingdateswerefixed:ÐlatestdatebywhichtheENhastobeimplementedatnationallevelbypublicationofanidenticalnationalstandardorbyendorsement(dop)1999-01-01ÐlatestdatebywhichthenationalstandardsconflictingwiththeENhavetobewithdrawn(dow)1999-01-01ThisEuropeanStandardhasbeenpreparedunderamandategiventoCENELECbytheEuropeanCommissionandcoversessentialrequirementsofECDirective94/9/EC.ContentsPageForeword21Scope32Normativereferences33Definitions34Generalrequirements35Performancerequirements35.1General35.2Unpoweredstorage35.3Calibrationcurve(notapplicabletoalarm-onlyapparatus)35.4Drift(continuousdutyapparatus)3Page5.5Drift(spotreadingapparatus)35.6Alarm35.7Temperature35.8Pressure35.9Humidity35.10