Designation:D2029−97(Reapproved2017)StandardTestMethodsforWaterVaporContentofElectricalInsulatingGasesbyMeasurementofDewPoint1ThisstandardisissuedunderthefixeddesignationD2029;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodsdescribethedeterminationofthewatervaporcontentofelectricalinsulatinggasesbydirectorindirectmeasurementofthedewpointandthecalculationofthewatervaporcontent.1.2Thefollowingfourtestmethodsareprovided:1.2.1MethodAdescribestheautomaticchilledmirrormethodformeasurementofdewpointaslowas−73°C(−99°F).1.2.2MethodBdescribesthemanualchilledmirrorordewcupmethodformeasurementofdewpointaslowas−73°C(−99°F).1.2.3MethodCdescribestheadiabaticexpansionmethodformeasurementofdewpointaslowas−62°C(−80°F).1.2.4MethodDdescribesthecapacitancemethodformea-surementofdewpointaslowas−110°C(−166°F).1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificwarnings,see8.1.1,9.2,10.1.2and10.2.5.2.ReferencedDocuments2.1ASTMStandards:2D1933SpecificationforNitrogenGasasanElectricalInsu-latingMaterialD2472SpecificationforSulfurHexafluorideD3283SpecificationforAirasanElectricalInsulatingMa-terial3.Terminology3.1Definitions:3.1.1dewpoint,n—thetemperaturetowhichagasmustbecooledatconstantpressureandconstantwatervaporcontentinorderforsaturationtooccur.Anyfurthercoolingusuallyresultsinformationofthefirstdropofdew.3.1.2hygroscopic,adj—readilytakingupandretainingmoisture.4.SummaryofTestMethods4.1MethodA—Theautomaticchilledmirrormethodusesthechilledmirrordewpointcondensationpri...
