405052各种量程、各种接口压力变送器PressureanddifferentialpressureswitchesType4ADSareusedtomeasurevacuum,pressureordifferentialpressureinHVACandfiltertechnology,forexample.Pressureanddifferentialpressureswitchesconsistessentiallyofbase,diaphragm,intermediatedisc,caseandprotectivecover.Whenusedaspressureorvacuumswitch,thebaseanddiaphragmwithdiscformthepressurechamber.Whenusedasadifferentialpressureswitch,thebaseandaseconddiaphragmwithintermediatediscformthetwopressurechambers.Apressurechangeinthepressurechambercausesanaxialdisplacementofapinlinkedtothediaphragm.Whentheselectedswitchingpointisreached,aspring-loadedcontactisactivated.