【英文标准名称】:DetailSpecificationforRotarySwitchesofCertifiedQuality(LowCurrentRating)16PositionsMaximum
【原文标准名称】:已质量认证的(低电流)最大16位置的旋转式开关的详细规范
【标准号】:ANSI/EIA520FAAB-1995
【标准状态】:现行
【国别】:美国
【发布日期】:1995
【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】:规范;旋转式开关;开关;电子工程
【英文主题词】:switches;specification;electronicengineering;rotaryswitches
【摘要】:Coversrotaryswitch(lowcurrentrating)16positionsmaximum,Centralmounting,15mmmaximumwidth;22.5degree,30degree,36degree,45degree,60degree,90degree,anglesofthrow.
【中国标准分类号】:L22
【国际标准分类号】:31_220_20
【页数】:
【正文语种】:英语


【英文标准名称】:StandardTestMethodforDeterminationofSulfurCompoundsinNaturalGasandGaseousFuelsbyGasChromatographyandFlamePhotometricDetection
【原文标准名称】:用气相色谱和火焰光度检测对天然气和气态燃料中含硫化合物测定的标准试验方法
【标准号】:ASTMD6228-1998(2003)
【标准状态】:现行
【国别】:
【发布日期】:1998
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D03.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:火焰光度检测;含硫化合物;加嗅剂;气相色谱法
【英文主题词】:flamephotometricdetection;gaschromatography;sulfurcompounds,odorants
【摘要】:Manysourcesofnaturalgasandpetroleumgasescontainvaryingamountsandtypesofsulfurcompounds,whichareodorous,corrosivetoequipment,andcaninhibitordestroycatalystsusedingasprocessing.Theiraccuratemeasurementisessentialtogasprocessing,operation,andutilization.Smallamounts,typically,1to4ppmvofsulfurodorantcompounds,areaddedtonaturalgasandliquefiedpetroleum(LP)gasesforsafetypurposes.Someodorantcompoundscanbereactiveandmaybeoxidized,formingmorestablecompoundshavinglowerodorthresholds.Thesegaseousfuelsareanalyzedforsulfurodorantstohelpensureappropriateodorantlevelsforsafety.Thistestmethodoffersatechniquetodetermineindividualsulfurspeciesingaseousfuelandthetotalsulfurcontentbycalculation.Gaschromatographyisusedcommonlyandextensivelytodetermineothercomponentsingaseousfuelsincludingfixedgasandorganiccomponents(seeTestMethodD1945).ThistestmethoddictatestheuseofaspecificGCtechniquewithoneofthemorecommondetectorsformeasurement.1.1Thistestmethodcoversthedeterminationofindividualvolatilesulfur-containingcompoundsingaseousfuelsbygaschromatography(GC)withflamephotometricdetection(FPD).Thedetectionrangeforsulfurcompoundsisfrom20to20000picograms(pg)ofsulfur.Thisisequivalentto0.02to20mg/m3or0.014to14ppmvofsulfurbasedupontheanalysisofa1-mLsample.1.2ThistestmethoddescribesaGC-FPDmethodusingaspecificcapillaryGCcolumn.OtherGC-FPDmethods,withdifferencesinGCcolumnandequipmentsetupandoperation,maybeusedasalternativemethodsforsulfurcompoundanalysiswithdifferentrangeandprecision,providedthatappropriateseparationofthesulfurcompoundsofinterestcanbeachieved.1.3Thistestmethoddoesnotintendtoidentifyallindividualsulfurspecies.Totalsulfurcontentofsamplescanbeestimatedfromthetotaloftheindividualcompoundsdetermined.Unknowncompoundsarecalculatedasmonosulfur-containingcompounds.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesstatedininch-poundunitsareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:E24
【国际标准分类号】:
【页数】:6P.;A4
【正文语种】: