Designation:D7686−11StandardTestMethodforField-BasedConditionMonitoringofSootinIn-ServiceLubricantsUsingaFixed-FilterInfrared(IR)Instrument1ThisstandardisissuedunderthefixeddesignationD7686;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodpertainstofield-basedmonitoringofsootindieselcrankcaseengineoilsaswellasinothertypesofengineoilswheresootmaycontaminatethelubricantasaresultofablow-byduetoincompletecombustionoffuels.Itisapplicabletooilshavingsootlevelsofupto12%.1.2Thistestmethodusesfilter-basedinfraredtechnologyformonitoringofsootbuild-upinin-servicepetroleumandhydrocarbon-basedlubricantsasaresultofnormalmachineryoperation.Sootlevelsinengineoilsriseassootparticlescontaminatetheoilasaresultofexhaustgasrecirculationfromblow-by.Thistestmethodisdesignedasafast,simpleandfieldcapablespectroscopiccheckforsootinin-servicehydrocarbon-basedlubricantswiththeobjectiveofhelpingdiagnosetheoperationalconditionofthemachinebasedonmeasuringthelevelofsootintheoil.1.3Thistestmethodisintendedasafieldtestonly,andshouldbetreatedassuch.Criticalapplicationsshoulduselaboratorybasedmethods,suchasThermalGravimetricAnaly-sis(TGA)describedinTestMethodD5967,AnnexA4.1.4Acquisitionofspectraldataformeasuringsootinin-serviceoilandlubricantsampleswiththeuseofafixed-filterIRinstrumentisdescribedinthistestmethod.Calibrationagainstpreparedsootstandardsisalsodescribed.NOTE1—Itisnottheintentofthistestmethodtoestablishorrecommendnormal,cautionary,warningoralertlimitsforanymachinery.Suchlimitsshouldbeestablishedinconjunctionwithadviceandguidancefromthemachinerymanufacturerandmaintenancegroup.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwith...
