FLUID MEDIUM PRESSURE DERIVATIVE SENSOR, PNEUMOELECTRIC PRESSURE RELAY AND SYSTEM WARNING ABOUT AIR LEAKAGE FROM PUMPED TIRE Russian patent published in 1995 - IPC

FIELD: measurement technology. SUBSTANCE: pressure derivative sensor has case forming pressure chamber which is provided with permeable wall and flexible diaphragm isolating pressure chamber from monitored system where pressure drop sensor is used. This sensor used in pneumatic tire functions so that diaphragm bends down when pressure within tire changes at critical rate and turns on transmitter. Sensor will not turn on transmitter when rate of pressure change is below critical level. EFFECT: improved design. 31 cl, 14 dwg