FIELD: measurement technology. SUBSTANCE: device measuring level and volume of material in vessel has sound conductive tube mounted in vessel, microphone placed by upper hole of tube, electric motor drive, drum with electric cable coupled to it, low-frequency amplifier connected to microphone, counter of number of revolutions and vibration source freely suspended from cable inside tube and made for contact with tube walls. EFFECT: simplified design, increased functional reliability. 3 dwg
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