... . This is the way the basic pressure switches are working.2) Alternate action (also referred to as latching or bistable): the ... Company Product/Service (We Sell):PLC,HMI,rotary encoder,ozone generator,switching power supply,voltage regulator,fuse,circuit breaker,signal lamp ... ):3,000-5,000 square meters Factory Location:Xinguang Industry Zone, liushi town, yueqing city,Zhejiang, China QA/QC:In House ...