【英文标准名称】:Gasanalysis.Preparationofcalibrationgasmixturesusingdynamicvolumetricmethods.Thermalmass-flowcontrollers
【原文标准名称】:气体分析.动态容量法制备校准气体混合物.热式质量流量控制器
【标准号】:BSENISO6145-7-2010
【标准状态】:现行
【国别】:英国
【发布日期】:2009-04-30
【实施或试行日期】:2009-04-30
【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】:
【英文主题词】:Calibrationgases;Controlsamples;Eyelets;Flowregulators;Flows;Gasanalysis;Gasmixtures;Gas-volumetricanalysis;Massflowrates;Mathematicalcalculations;Orifices;Preparation;Production;Specimenpreparation;Testgases;Thermal;Volumetricanalysis
【摘要】:ThispartofISO6145isoneofaseriesofInternationalStandardsdealingwithdynamicvolumetricmethodsusedforthepreparationofcalibrationgasmixtures.Thispartspecifiesamethodforcontinuousproductionofcalibrationgasmixtures,containingtwoormorecomponents,frompuregasesorothergasmixturesbyuseofcommerciallyavailablethermalmass-flowcontrollers.Ifthismethodisemployedforthepreparationofcalibrationgasmixtures,theoptimumperformanceisasfollows:therelativeexpandeduncertaintyofmeasurement,U,obtainedbymultiplyingthecombinedstandarduncertaintybyacoveragefactork=2,isnotgreaterthan2%.Ifpre-mixedgasesareusedinsteadofpuregases,molefractionsbelow10canbeobtained.Themeasurementofmassflowisnotabsoluteandtheflowcontrollerrequiresindependentcalibration.Themeritsofthemethodarethatalargequantityofthegasmixturecanbepreparedonacontinuousbasisandthatmulticomponentmixturescanbepreparedasreadilyasbinarymixturesiftheappropriatenumberofthermalmass-flowcontrollersisutilized.NOTEGas-blendingsystemsbaseduponthermalmass-flowcontrollers,someincludingthefacilityofcomputerizationandautomaticcontrol,arecommerciallyavailable.
【中国标准分类号】:G86
【国际标准分类号】:71_040_40
【页数】:24P.;A4
【正文语种】:英语