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【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

标准名称：	一等标准膨胀法真空装置检定规程
英文名称：	Expansion Vacuum Apparatus (Grade I)
中标分类：	综合 >> 计量 >> 力学计量
发布部门：	国家技术监督局
发布日期：	1991-03-12
实施日期：	1991-10-01
首发日期：
作废日期：
归口单位：	中国计量科学研究院
起草单位：	中国计量科学研究院
起草人：	费喟南、周起春
出版社：	中国计量出版社
出版日期：	1991-10-01
页数：	8页

本规程适用于新制造、使用中和修理后的压力范围为10-3~104Pa的一等标准膨胀法真空装置的检定。

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