一.簡(jiǎn)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(hào)及分類 應(yīng)用于角行程的有：4210，4211，4212，4215 應(yīng)用于直行程的：4220，4221，4222三.詳細(xì)信息請(qǐng)?jiān)诒菊鞠螺d產(chǎn)品樣本資料！點(diǎn)此下載！