一.簡介 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.具體型號及分類 應用于角行程的有：4210，4211，4212，4215 應用于直行程的：4220，4221，4222三.詳細信息請在本站下載產品樣本資料！點此下載！