ULTRASONIC WARNING DEVICE Russian patent published in 2004 - IPC

FIELD: ultrasonic engineering; liquid level control in oil refining, chemical, and other industries. SUBSTANCE: ultrasonic warning device has transceiving piezoelectric converters with deflectors. Piezoelectric converters are connected in pairs to single-wire communication lines. Distance to deflectors is different in each pair of piezoelectric converters; communication lines are connected to transceiving devices. Outputs of transceiving devices are connected to amplifier and inputs, to AND gates. Inputs of AND gates are coupled with monostable multivibrator and with flip-flop outputs. Flip-flop outputs are connected to generator unit and the latter is connected to monostable multivibrator and to logic unit. Logic unit is coupled with flip-flop output and with comparator output. One input of comparator is connected to amplifier output and other input, to potentiometer. Logic unit outputs are connected to peak detectors and the latter are connected to relay-indicator units. EFFECT: enhanced reliability of level and interface indication in heavily gasladen liquid. 3 cl, 3 dwg