【英文标准名称】:Heatmeterinstallation.Someguidelinesforselecting,installationandoperationofheatmeters
【原文标准名称】:热电偶装置.一些关于热电偶选择,安装和操作指南
【标准号】:PDCR13582-1999
【标准状态】:现行
【国别】:英国
【发布日期】:2008-03-31
【实施或试行日期】:
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:Aheatmeteriscomposedofthreeparts,aflowsensor,atemperaturesensorpairandacalculator.Thecalculatorisaunitwhichcalculatesvolumesandenergyconsumptionusingthevaluesfromthetemperaturesensorsandtheflowsensor.ThemostcommontypeoftemperaturesensorisaresistancethermometerofplatinumtypePt100,Pt500orPt1000.Thesensorsmeasurethetemperaturedifferencebetweentheincomingandoutgoingliquid.Theflowsensorisprobablythemosttroublesomeassemblyoftheheatmeter.Despiteanaccuracyrequirementofonly4-10%itisveryeasytofalloutsidetheselimits.Inordertocountertheseeffectsasfaraspossible,therefollowsasummaryofthevarioustypesofflowsensorandtheiradvantagesanddisadvantages.Thesizingofmeterstomatchtheirrequireddutyfrequentlyturnsouttohavebeenincorrectlyestimatedwhentheheatingplantcommencesoperation.Inmostcasesheatmetersthataretoolargefortheireventualdutyarespecifiedandaccuracyatlowloadsuffersasaresult.Whilstthispaperwillgivesomeguidanceonessentials,itisfeltthatmoreinformationonthistopicwouldbewelcomed.Heatmeteraccuraciesattimesofrapidlychangingheatdemandareunlikelytobehigh.Whilstattimesoflowdemandtheeffectofmeterinaccuracyintermsoflostrevenueislikelytobesmall,rapidchangesinvolvinghighdemandsonthenetworkmaypossiblyhaveimportantimplicationsinlostrevenueifmeterreactiontorapidchangesisslow.Researchintothesubjectseemstohavebeenlargelyneglectedsofar.ThemostcommonlyusedtypesofflowsensorshavebeenlistedinAnnexBandtheeffectonaccuracyofdifferenttypesofdisturbancesforeachofthelistedtypesofflowsensorsareconsidered.Thereislittleinformationontheeffectsofflowandflowdisturbancesontheservicelifeoftheflowsensor,asdistinctfromitseffectonthesensor’saccuracy.Tobewelcomed,therefore,isthelongtermresearchprojectonthistopicinitiatedinGermanywhichshouldresultinusefuldata.
【中国标准分类号】:K61
【国际标准分类号】:17_200_10
【页数】:30P.;A4
【正文语种】:英语