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【英文标准名称】:Gasanalysis-Preparationofcalibrationgasmixturesusingdynamicvolumetricmethods-Thermalmass-flowcontrollers
【原文标准名称】:气体分析.标定用混合气体的制备.动态容量法.热物流控制器
【标准号】:BSISO6145-7-2001
【标准状态】:作废
【国别】:英国
【发布日期】:2001-07-15
【实施或试行日期】:2001-07-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:容量分析;气体分析;校正;质量(物质);流量控制;混合物;流量调节阀;热测量;化学成分
【英文主题词】:Calibrationgases;Controlsamples;Eyelets;Flowregulators;Flows;Gasanalysis;Gasmixtures;Gas-volumetricanalysis;Massflowrates;Orifices;Preparation;Production;Specimenpreparation;Testgases;Thermal;Volumetricanalysis
【摘要】:ThispartofISO6145specifiesamethodforthecontinuousproductionofcalibrationgasmixtures,containingtwoormorecomponents,frompuregasesorothergasmixturesbyuseofcommerciallyavailablethermalmass-flowcontrollers.Byadjustmentofset-pointsonflowcontrollerstopre-determinedvalues,itispossibletochangethecompositionofthegasmixturerapidlyandinacontinuouslyvariablemanner.Byselectionofappropriatecombinationsofthermalmass-flowcontrollersandwithuseofpuregases,thevolumefractionofthecomponentofinterestinthecomplementarygascanbevariedbyafactorof1000.Therelativeexpandeduncertaintyofmeasurement,U,obtainedbymultiplyingtherelativecombinedstandarduncertaintybyacoveragefactor,k=2,isnotgreaterthan2%.Ifpre-mixedgasesareusedinsteadofpuregases,molefractionsbelow10canbeobtained.Themeasurementofmassflowisnotabsoluteandtheflowcontrollerrequiresindependentcalibration.Themeritsofthemethodarethatalargequantityofthegasmixturecanbepreparedonacontinuousbasisandthatmulti-componentmixturescanbepreparedasreadilyasbinarymixturesiftheappropriatenumberofthermalmass-flowcontrollersisutilized.Gasblendingsystems,baseduponthermalmass-flowcontrollers,andsomeincludingthefacilityofcomputerizationandautomaticcontrol,arecommerciallyavailable.
【中国标准分类号】:Z15
【国际标准分类号】:
【页数】:22P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodforDeterminationofVolatileOrganicChemicalsinAtmospheres(CanisterSamplingMethodology)
【原文标准名称】:测定大气中挥发性有机化学物质的标准试验方法(罐装抽样法)
【标准号】:ASTMD5466-2001
【标准状态】:现行
【国别】:美国
【发布日期】:2001
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:G04
【国际标准分类号】:13_040_01
【页数】:21P;A4
【正文语种】:英语