What is the difference between a pressure switch and a differential pressure switch?
2, the working principle is not the same:
(1) is when the system pressure is higher or lower than the rated safety pressure, the sensor inner diaphragm instantaneous movement, through the connecting rod to push the switch connector connected or disconnected, when the pressure dropped to or rise rated recovery The switch is automatically reset, or simply when the measured pressure exceeds the rated value, the free end of the elastic element displacement, directly or after comparison to push the switching element, change the switching element on and off state , To achieve the purpose of controlling the measured pressure.
(2) differential pressure switch consists of two membrane chamber cavity, two cavity were sealed by two pieces of film and a piece of differential pressure diaphragm seal. The high pressure and the low pressure enter the high pressure chamber and the low pressure chamber of the differential pressure switch respectively, and the sensed differential pressure causes the pressure sensitive diaphragm to be deformed, and finally the upper micro switch is started by the mechanical structure such as the railing spring to finally output the electric signal.
The main difference between the pressure switch and the differential pressure switch:
1, the structure is not the same:
(1) pressure switch with high stability, high precision pressure sensor and transmission circuit, and then through a dedicated CPU modular signal processing technology to achieve the media pressure signal detection, display, alarm and control signal output.
(2) and the differential pressure switch is composed of two high sensitivity of the pressure element, if both change, it will cause the switch mechanism to control the equipment such as motor-driven valves. The switch mechanism provides the SPDT non-fast acting (floating) action, so the shared movable contact will touch one of the two fixed contacts, or stay between the two (no contact).
