DEVICE FOR CHECKING OF WORKING FLUID CRITICAL LEVEL Russian patent published in 1998 - IPC

FIELD: fluid level checking and recording facilities. SUBSTANCE: signal from master oscillator is supplied to reference signal former, output of which is connected to radiator. Receiver connected to the latter receives ultrasonic signal of radiator and transmits it to monitoring signal former. Resonance frequency corresponding to fluid availability or absence in action zone of oscillation radiator and receiver is performed through feedback filter. Then acoustic signal obtained arrives at resonance check selector where clock period of pulse sequence is established, and value of available resonant frequency is determined by means of digital filter. If this value exceeds preset level, insufficient level of working fluid is indicated. EFFECT: higher accuracy of measurements. 7 cl, 1 dwg