Designation:D2624−15AnAmericanNationalStandardDesignation:274/99StandardTestMethodsforElectricalConductivityofAviationandDistillateFuels1ThisstandardisissuedunderthefixeddesignationD2624;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thesetestmethodscoverthedeterminationoftheelectricalconductivityofaviationanddistillatefuelswithandwithoutastaticdissipatoradditive.Thetestmethodsnormallygiveameasurementoftheconductivitywhenthefuelisuncharged,thatis,electricallyatrest(knownastherestconductivity).1.2Twotestmethodsareavailableforfieldtestsoffuelconductivity.Theseare:(1)portablemetersforthedirectmeasurementintanksorthefieldorlaboratorymeasurementoffuelsamples,and(2)in-linemetersforthecontinuousmea-surementoffuelconductivitiesinafueldistributionsystem.Inusingportablemeters,caremustbetakeninallowingtherelaxationofresidualelectricalchargesbeforemeasurementandinpreventingfuelcontamination.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,see7.1,7.1.1,and11.2.1.2.ReferencedDocuments2.1ASTMStandards:2D4306PracticeforAviationFuelSampleContainersforTestsAffectedbyTraceContaminationD4308TestMethodforElectricalConductivityofLiquidHydrocarbonsbyPrecisionMeter3.Terminology3.1Definitions:3.1.1picosiemenspermetre,n—theunitofelectricalcon-ductivityisalsocalledaconductivityunit(CU).AsiemenistheSIdefinitionofreciprocalohmsometimescalledmho.1pS/m51310212Ω21m2151cu51picomh...
