PRESSURE DIFFERENCE RELAY Russian patent published in 1999 - IPC

FIELD: measurement technology, measurement of threshold value of pressure difference. SUBSTANCE: proposed pressure difference relay has first case which internal space houses piston with restoring sealing member and spring interacting with piston, which second case where hermetically sealed reed relay interacting with controlling magnet is anchored. Additional magnet is located with clearance from controlling magnet. Restoring sealing member is fabricated in the form of elastic membrane. EFFECT: enhanced accuracy of operation of pressure difference relay under conditions of heavy background pressures. 1 dwg