Designation:F660−83(Reapproved2013)StandardPracticeforComparingParticleSizeintheUseofAlternativeTypesofParticleCounters1ThisstandardisissuedunderthefixeddesignationF660;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesaprocedureforcomparingthesizesofnonsphericalparticlesinatestsampledeterminedwithdifferenttypesofautomaticparticlecounters,whichoperateondifferentmeasuringprinciples.1.2Ascalefactorisobtainedbywhich,intheexaminationofagivenpowder,thesizescaleofoneinstrumentmaybemultipliedtoagreewiththesizescaleofanother.1.3Thepracticeconsidersrigidparticles,freeoffibers,ofthekindusedinstudiesoffiltration,suchas:commerciallyavailableteststandardsofquartzoralumina,orflyash,orsomepowderedchemicalreagent,suchasironoxideorcalciumsulfate.1.4Threekindsofautomaticparticlecountersareconsid-ered:1.4.1Imageanalyzers,whichviewstationaryparticlesun-derthemicroscopeand,inthispractice,measurethelongestend-to-enddistanceofanindividualparticle.1.4.2Opticalcounters,whichmeasuretheareaofashadowcastbyaparticleasitpassesbyawindow;and1.4.3Electricalresistancecounters,whichmeasurethevol-umeofaparticleasitpassesthroughanorificeinanelectricallyconductiveliquid.1.5Thispracticealsoconsiderstheuseofinstrumentsthatprovidesedimentationanalyses,whichistosayprovidemeasuresoftheparticlemassdistributionasafunctionofStokesdiameter.ThepracticeprovidesawaytoconvertmassdistributionintonumberdistributionsothatthemeaningofStokesdiametercanberelatedtothediametermeasuredbytheinstrumentsin1.4.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2F661Pr...
