Designation:D4298−04(Reapproved2014)´1StandardGuideforIntercomparingPermeationTubestoEstablishTraceability1ThisstandardisissuedunderthefixeddesignationD4298;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditorialcorrectionsweremadethroughoutinDecember2014.1.Scope1.1Thisguidecoverstwoproceduresforestablishingthepermeationrateofapermeationtubeanddefiningtheuncer-taintyoftheratebycomparisontoNationalInstituteofStandardsandTechnology’sStandardReferenceMaterials(SRM).1.2ProcedureAconsistsofadirectcomparisonofthepermeationrateofthedeviceundergoingcalibrationwiththatofanSRM.1.3ProcedureBconsistsofagravimetriccalibrationpro-cessinwhichacertifiedpermeationtubeisusedasaqualitycontrolforthemeasurements.1.4Bothproceduresarelimitedtothecasewhereasuitablecertifiedpermeationdeviceisavailable.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.(See8.2onSafetyPrecautions.)2.ReferencedDocuments2.1ASTMStandards:2D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD3249PracticeforGeneralAmbientAirAnalyzerProce-duresD3609PracticeforCalibrationTechniquesUsingPerme-ationTubesD3631TestMethodsforMeasuringSurfaceAtmosphericPressureE1SpecificationforASTMLiquid-in-GlassThermometersE319PracticefortheEvaluationofSingle-PanMechanicalBalancesE617SpecificationforLaboratoryWeightsandPrecisionMassStandards3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthisguide,refertoTerminologyD1356.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1workingstandard—astandardusedinthelabo...
