INTERNATIONALIECSTANDARD61779-4Firstedition1998-04Electricalapparatusforthedetectionandmeasurementofflammablegases–Part4:PerformancerequirementsforgroupIIapparatusindicatingavolumefractionupto100%lowerexplosivelimitAppareilsélectriquesdedétectionetdemesuredesgazcombustibles–Partie4:RèglesdeperformancedesappareilsdugroupeIIpouvantindiquerunefractionvolumiquejusqu'à100%delalimiteinférieured’explosivitéReferencenumberIEC61779-4:1998(E)CopyrightInternationalElectrotechnicalCommissionProvidedbyIHSunderlicensewithIECNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS--``````-`-`,,`,,`,`,,`---NumberingAsfrom1January1997allIECpublicationsareissuedwithadesignationinthe60000series.ConsolidatedpublicationsConsolidatedversionsofsomeIECpublicationsincludingamendmentsareavailable.Forexample,editionnumbers1.0,1.1and1.2refer,respectively,tothebasepublication,thebasepublicationincorporatingamendment1andthebasepublicationincorporatingamendments1and2.ValidityofthispublicationThetechnicalcontentofIECpublicationsiskeptunderconstantreviewbytheIEC,thusensuringthatthecontentreflectscurrenttechnology.InformationrelatingtothedateofthereconfirmationofthepublicationisavailableintheIECcatalogue.Informationonthesubjectsunderconsiderationandworkinprogressundertakenbythetechnicalcommitteewhichhaspreparedthispublication,aswellasthelistofpublicationsissued,istobefoundatthefollowingIECsources:•IECwebsite*•CatalogueofIECpublicationsPublishedyearlywithregularupdates(On-linecatalogue)*•IECBulletinAvailablebothattheIECwebsite*andasaprintedperiodicalTerminology,graphicalandlettersymbolsForgeneralterminology,readersarereferredtoIEC60050:InternationalElectrotechnicalVocabulary(IEV).Forgraphicalsymbols,andlettersymbolsandsignsapprovedbytheIECforgeneraluse,readersarereferredtopublicationsIEC60027:Lettersymbolstobeusedinelectricaltechnology,IEC60417:Graphicalsymbolsforuseonequipment.Index,surveyandcompilationofthesinglesheetsandIEC60617:Graphicalsymbolsfordiagrams.*Seewebsiteadd...
