Designation:D4298−22StandardGuideforIntercomparingPermeationTubestoEstablishTraceability1ThisstandardisissuedunderthefixeddesignationD4298;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoverstwoproceduresforestablishingthepermeationrateofapermeationtubeanddefiningtheuncer-taintyoftheratebycomparisontoNationalInstituteofStandardsandTechnology’sStandardReferenceMaterials(SRM).1.2ProcedureAconsistsofadirectcomparisonofthepermeationrateofthedeviceundergoingcalibrationwiththatofanSRM.1.3ProcedureBconsistsofagravimetriccalibrationpro-cessinwhichacertifiedpermeationtubeisusedasaqualitycontrolforthemeasurements.1.4Bothproceduresarelimitedtothecasewhereasuitablecertifiedpermeationdeviceisavailable.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.(See8.2onSafetyPrecautions.)1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD3249PracticeforGeneralAmbientAirAnalyzerProce-duresD3609PracticeforCalibrationTechniquesUsingPerme-ationTubesD3631TestMethodsforMeasuringSurfaceAtmosphericPressureE1SpecificationforASTMLiquid-in-GlassThermometersE319PracticefortheEvaluationofSingle-PanMechanicalBalances(Withdrawn2021)3E617Speci...
