【英文标准名称】:PracticeforDefiningSize,Calibration,Resolution,andCountingAccuracyofLiquid-BorneParticleCounterUsingNear-MonodisperseSphericalParticulateMaterial
【原文标准名称】:使用近似单向扩散球形颗粒材料定义液体传送颗粒计数器的尺寸、校准、分辨率和计数精度惯例
【标准号】:ANSI/ASTMF658-2000
【标准状态】:现行
【国别】:美国
【发布日期】:2000
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:计数器;尺寸;颗粒;校正
【英文主题词】:size;particles;calibration;counters
【摘要】:Thispracticecoversproceduresforcalibratinganddeterminingperformanceofanopticalliquid-borneparticlecounter(LPC)whichusesanopticalsystembaseduponlightextinctionmeasurement.ThispracticeisdirectedtowardsdeterminationofaccuracyandresolutionoftheLPCforcharacterizingthesizeandnumberofparticles,whichhavebeenpassedintothesampleinletoftheLPC.Considerationofinletsamplingefficiencyisnotpartofthispractice.Theprocedurescoveredinthispracticeincludethosetomeasuresamplevolumeandflowrate,zerocountlevel,particlesizingandcountingaccuracy,particlesizingresolution,particlecountingefficiency,andparticleconcentrationlimit.Theparticlesizeparameterreportedinthispracticeistheequivalentopticaldiameterbasedonprojectedareaofcalibrationparticleswithknownphysicalpropertiesdispersedinliquid.ThemanufacturernormallyspecifiestheminimumdiameterthatcanbereportedbyanLPC;thedynamicrangeoftheLPCbeinguseddeterminesthemaximumdiameterthatcanbereportedforasinglesample.Typicalminimumreporteddiametersareapproximately2'm,andatypicaldynamicrangespecificationwillbeapproximatelyfrom50to1.ThecountingratecapabilityoftheLPCislimitedbytemporalcoincidenceofparticlesinthesensingvolumeoftheLPCandbythesaturationlevelormaximumcountingratecapabilityoftheelectronicsizingandcountingcircuitry.CoincidenceisdefinedasthesimultaneouspresenceofmorethanoneparticlewithintheLPCopticallydefinedsensingzoneatanytime.Thecoincidencelimitisastatisticalfunctionofparticleconcentrationinthesampleandthesensingzonevolumewhenparticlesizeisinsignificantincomparisontothesensingvolumedimensions.Thislimitationmaybemodifiedbythepresenceofparticleswithdimensionsolargeastobeasignificantfractionofthesensingzonedimension.ThesaturationlevelrateoftheelectroniccountingcircuitryshallbespecifiedbythemanufacturerandisnormallygreaterthantheLPCrecommendedmaximumcountingratefortheparticleconcentrationsusedforanyportionofthispractice.CalibrationinaccordancewithallpartsofthispracticemaynotberequiredforroutinefieldcalibrationofanLPCunlesssignificantchangeshaveoccurredinoperationoftheLPCormajorcomponentrepairsorreplacementshavebeenmade.TheLPCshallthenbetakentoasuitablemetrologyfacilityforcompletecalibration.Normalroutinefieldcalibrationmaydeterminesampleflowrate,zerocountlevel,andparticlesizingaccuracy.ThespecificLPCfunctionstobecalibratedshallbedeterminedonthebasisofagreementbetweenthepurchaserandtheuser.Themaximumtimeintervalbetweencalibrationsshallbedeterminedbyagreementbetweenthepurchaserandtheuser,butshallnotexceedtwelvemonths,unlessLPCstabilityforlongerperiodsisverifiedbymeasurementsinaccordancewiththispractice.Thisstandardmayinvolvehazardousmaterials,operation,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G04
【国际标准分类号】:17_020
【页数】:
【正文语种】:英语
基本信息
| 标准名称： | 热室操纵杆 |
| 中标分类： |
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| 发布日期： | |
| 实施日期： | 2002-02-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 1页 |
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