FIELD: determination of level of drinkable and technical water in reservoirs of water supply systems. SUBSTANCE: sequence of standard pulses is generated, gate with duration equal to time interval for probing of base distance for automatic control of pulse repetition frequency of standard pulses is formed, process of autocirculation of base acoustic pulses, which probe in sequence check and base distances is organized to form first sequence of information pulses. In process of autocirculation of basic acoustic pulses process of radiation of additional acoustic pulses which probe base distance is organized from which second sequence of information pulses is formed and distance to object is controlled during reading of sequence of standard pulses generated in the course of time interval needed for formation of specified number of periods of first sequence of information pulses. Process of reading is carried out with blocking of mentioned sequence in time intervals necessary for probing of base distance by additional acoustic pulses. Gear for realization of method has acoustic transducer composed of two ultrasonic converters and electronic former of output signal including circuit forming first sequence of information pulses, counter of periods of this sequence, circuit forming second sequence of information pulses, circuit forming and blocking sequences of standard pulses and counter of pulses of given sequence with connection of its input of reading reset to output of counter of periods of first sequence of information pulses. Acoustic transducer can be manufactured in the form of multisectional measurement pipe-line composed of sections of pipes joined by couplings, vertically hanged in reservoir with checked liquid and provided with float in space of pipe-line. Ultrasonic converters are made in the form of cylinders and are mounted on walls of lower section of measurement pipe-line fabricated in the form of horizontal section. EFFECT: increased functional reliability. 3 cl, 3 dwg
