FIELD: measurement technology, measurement of velocity and flow rate of substance. SUBSTANCE: ultrasonic oscillations are in turn radiated and received along and counter flow of measured medium and velocity of flow is found by difference of frequencies of synchrorings. Ultrasonic signals sent over communication line are damped at input and output from it. Flowmeter has two electroacoustic inverted converters, electronic unit, communication line, four asynchronous switches and two reactances. EFFECT: improved efficiency and reliability of method and device. 2 cl, 1 dwg
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