DIFFERENTIAL PRESSURE SENSOR Russian patent published in 2008 - IPC H01H35/24 

FIELD: instrumentation engineering including refrigeration and protection against inadmissible pressure drop in circulating liquid pumps.

SUBSTANCE: proposed device has case with lever secured therein on axle. One arm of lever is designed to actuate selector switch and other one is coupled on one end with range spring and on other end, with sensing system rod. Sensing system has two bellows mounted in sensing system case with nozzle communicating with high- and low-pressure cavities. Bellows are disposed one inside other , their both ends are joined together; low-pressure space is disposed between bellows and high-pressure cavity, between sensing system case and large bellows.

EFFECT: enhanced resistance to mechanical impacts, reduced material input, facilitated manufacture.

1 cl, 1 dwg