Designation:F649–01StandardPracticeforSecondaryCalibrationofAirborneParticleCounterUsingComparisonProcedures1ThisstandardisissuedunderthefixeddesignationF649;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversproceduresforadjustingthesizerangesofanairbornediscreteparticlecounter(DPC)tomatchsize/concentrationdatafromareferenceDPCthathasbeencalibratedforcountingandsizingaccuracyinaccordancewithPracticeF328andiskeptingoodworkingorder.Thepracticeisappliedinsituationswheretime,capabilities,orboth,requiredforcarryingoutproceduresinPracticeF328arenotavailable.ItisparticularlyusefulwheremorethanoneDPCmayberequiredtoobserveanenvironmentwheretheparticu-latematerialbeingcountedandsizedisdifferentincomposi-tionfromtheprecisionsphericalparticulatematerialsusedforcalibrationinPracticeF328and/oralloftheDPCsinusearenotsimilarinopticalorelectronicdesign.1.2Procedurescoveredhereincludethosetomeasuresampledandobservedairvolumeorflowrate,zerocountlevel,particlesizingandcountingaccuracy,particlesizingresolu-tion,particlecountingefficiency,andparticleconcentrationlimit.2.ReferencedDocuments2.1ASTMStandards:F328PracticeforCalibrationofanAirborneParticleCounterUsingMonodisperseSphericalParticles2E20PracticeforParticleSizeAnalysisofParticulateSub-stancesintheRangeof0.2µmto75µmbyOpticalMicroscopy32.2IESTStandard:IESTRP-CC001.3HEPAandULPAFilters43.SummaryofPractice3.1TheDPCundertestisusedtosamplefromanenviron-mentcontainingpolydisperseaerosolwhosenatureisthatanticipatedwheretheDPCwillbeused.Atthesametime,thereferenceDPCthathasbeencalibratedinaccordancewithPracticeF328,andmaintainedingoodworkingorder,isusedtosamplefromthesameenvironment.ThesizerangesettingsoftheDPC(s)undertestareadjustedsothatthereportedconcentrationdataareingoodagreementwiththedataproducedby...
