【英文标准名称】:StandardTestMethodforAutomaticParticleCountingofLubricatingandHydraulicFluidsUsingDilutionTechniquestoEliminatetheContributionofWaterandInterferingSoftParticlesbyLightExtinction
【原文标准名称】:使用稀释法通过消光法消除水分和干扰软颗粒的润滑和液压液体的自动颗粒计数的标准试验方法
【标准号】:ASTMD7647-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D02.96.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:automaticparticlecounter;diluent;emulsifiedwater;particlecontamination;particlecounting;softparticles;water-masking
【摘要】:Thistestmethodisintendedforuseinanalyticallaboratoriesincludingonsitein-serviceoilanalysislaboratories.Hardparticlesinlubricatingorfluidpowersystemshaveadetrimentaleffectonthesystemastheycauseoperatingcomponentstowearandalsoacceleratethedegradationoftheoil.Hardparticlesintheoiloriginatefromavarietyofsourcesincludinggenerationfromwithinanoperatingfluidsystemorcontamination,whichmayoccurduringthestorageandhandlingofnewoilsorviaingressintoanoperatingfluidsystem.Highlevelsofcontaminantscancausefilterblockagesandhardparticlescanhaveaseriousimpactonthelifeofpumps,pistons,gears,bearings,andothermovingpartsbyacceleratingwearanderosion.Particlecountresultscanbeusedtoaidinassessingthecapabilityofthefiltrationsystemresponsibleforcleaningthefluid,determiningifoff-linerecirculatingfiltrationisneededtocleanupthefluidsystem,oraidinginthedecisionofwhetherornotafluidchangeisrequired.Toaccuratelymeasurehardparticlecontaminationlevels,itisnecessarytonegatetheparticlecountscontributedbythepresenceofsmalllevelsoffreewater.Thismethodincludesaprocessbywhichthiscanbeaccomplishedusingawater-maskingdiluenttechniquewherebywaterdropletsofasizebelowthetargetlevelarefinelydistributed.Certainadditivesoradditiveby-productsthataresemi-insolubleorinsolubleinoil,namelythepolydimethylsiloxanedefoamantadditiveandoxidationby-products,areknowntocauselightscatteringinautomaticparticlecounters,whichinturncausesfalselyhighcounts.Theseandsimilarmaterialsarecommonlytermedx201C;softparticlesx201D;(see3.1.5)andarenotknowntodirectlyincreasewearanderosionwithinanoperatingsystem.Thecontributionoftheseparticlestotheparticlesizecumulativecountisnegatedwiththismethod.Theuseofdilutioninthistestmethodcounteractsviscosityeffectsforhighlyviscousoilsthatimpacttheaccuracyofautomaticopticalparticlecountingresults.1.1Thistestmethodcoversthedeterminationofparticleconcentrationandparticlesizedistributioninnewandin-serviceoilsusedforlubricationandhydraulicpurposes.1.2Particlesconsideredareintherangefrom4x00B5;m(c)to200x00B5;m(c)withtheupperlimitbeingdependentonthespecificautomaticparticlecounterbeingused.Note18212;Forthepurposeofthistestmethod,waterdropletsnotmaskedbythediluentprocedurearedetectedasparticles,andagglomeratedparticlesaredetectedandreportedasasinglelargerparticle.Note28212;Thesubscript(c)isusedtodenotethattheapparatushasbeencalibratedinaccordancewithISO11171.Thissubscript(c)strictlyonlyappliestoparticlesupto50x00B5;m.1.3Lubricantsthatcanbeanalyzedbythistestmethodarecategorizedaspetroleumproductsorsyntheticbasedproducts,suchas:polyalphaolefin,polyalkyleneglycol,orphosphateester.Applicableviscosityrangeisupto1000mm2/s@40x00B0;C.Thisproceduremaybeappropriateforotherpetroleumandsyntheticbasedlubricantsnotincludedintheprecisionstatement.1.4Samplescontainingvisibleparticlesmaynotbesuitableforanalysisusingthistestmethod.1.5Samplesthatareopaqueafterdilutionarenotsuitableforanalysisusingthistestmethod.1.6Thetestm......
【中国标准分类号】:N55
【国际标准分类号】:75_120
【页数】:9P.;A4
【正文语种】:英语