Electric contact pressure gauges is widley used to petrochemical,chemical,metallurgical  eletric power

 fields and so sorth,or appliedto measurement pressure of fluid medium  in the machine,Usually,electric

 contact pressure gaugesmatches with relevant electrical  apparatus,for instance,ralay and contactor.  

The insturment is consisted of measurement system,indicating system,electric contact  parts system,canse 

,adjustment system,junction box(socket)and otherwise.  

The principle is that under the condition of medium pressure,bourdon tube will show  the measured value in 

the dial by gear wheel equipment.in the meanwhile,the pointer  of instrument will make dynamic contact 

touch or cut with static one(upper limits or  low limits),leaing to the cut and turn-on of control system for the 

purpose of automatic  control and alarm.