一.简介 The4200SerieselectronicpositiontransmitterscombineFisher sfield-provenelectronicandmechanicalexpertiseinaversatile,accurateinstrumentthatsensesthepositionofadevice,andsendsastandard(4to20milliampere)outputsignaltoanindicatingdevice.Theinstrumentisavailableasatransmitterwithintegralhighandlowelectronictravellimitalarms,asatransmitteronly,orwithelectronictravellimitalarmsonly. Theinstrumentcansensethepositionofrotaryorslidingstemvalves,vents,dampersorotherdevices.Whentheinstrumentismounted,apotentiometershaftismechanicallyconnectedtothedevicetosensemechanicalmotion.Forastandardinstrument,asinglepotentiometerisprovidedforpositioninput,oranoptionaldualelementpotentiometerisavailabletoallowindependentelectricaloperationofthetransmitterandalarmcircuits. Theinstrumenthasstandard,orlongstroke(seefigure5),capabilitiesforslidingstemactuatorapplications.Forlongstrokeapplications,amultiturnpotentiometerattachedtoacable/pulleyassemblyisusedtosenselinearmotionoftheactuatorstemorotherdevices.Theinstrumentwithstandardcapabilitiescanalsobeusedonquarter-turnactuators. Forinstrumentsequippedwithelectronictravellimitalarms,individualelectronichighandlowalarmcircuitsdriveseparatehighandlowalarmSPDTrelays.Theuseradjuststhetrippointanddeadbandofthehighandlowalarmstothedesiredtravellimits.Whenthesensepotentiometervoltageishigherthanthehightrippoint,theelectronichighalarmcircuitde-energizesthehighalarmrelay.Whenthesensepotentiometervoltageislowerthanthelowtrippoint,thelowalarmcircuitde-energizesthelowalarmrelay.Thelowtrippointmaybeoffsetfromthehightrippointbyaslittleas5%oftheremainingspan.Intheeventofapowerlosstothealarmcircuits,bothalarmsaretripped(bothrelaysarede-energized).ThisindicatesaAvailableConfigurations.二.具体型号及分类 应用于角行程的有：4210，4211，4212，4215 应用于直行程的：4220，4221，4222三.详细信息请在本站下载产品样本资料！点此下载！