FIELD: monitoring presence of loose media in technological accumulating reservoirs; metallurgy; chemical, mining-and-dressing and other industries. SUBSTANCE: ultrasonic wave is periodically excited in acoustic radiator by square pulses; said wave is directed in parallel with surface of medium under test. Acoustic radiator and receiver and their waveguides are mounted at level under test on one side of vertical wall of reservoir at angle relative to each other in horizontal plane, symmetrically relative to point of intersection of central rays of directional pattern of radiation field and reception of acoustic path. Reflector is mounted din point of intersection of central rays. Point of intersection is located at distance equal to 1/4-1/3 of diameter of accumulating reservoir. Ultrasonic wave reflected from reflector is received by acoustic receiver and ultrasonic oscillations are converted into electrical intelligence signal. Amplitude magnitude is separated in intelligence signal and threshold signal is shaped whose level is selected to be equal to half minimum amplitude of intelligence signal and amplitudes of intelligence and threshold signals are compared. Generated difference signal is integrated for definite number of pulse repetition periods of exciting pulses, then it is indicated to judge of presence of loose medium at level being checked. EFFECT: enhanced reliability and accuracy of ultrasonic monitoring of level in accumulating reservoirs of large diameters. 4 dwg
