| 摘要 |
FIELD: machine building.SUBSTANCE: proposed device comprises acoustic transducer (1) with signal amplifier (2). Controlled bandpass filter (3) is connected to signal amplifier (2), AC/DC converter (4) being arranged at filter output. Said AC/DC converter (4) is connected with signal amplitude memory consisting of cells (5-7) and switch (8). Said signal amplitude memory unit is connected with signal amplitude indicator (9) to indicate the tightness of shutoff valves.EFFECT: control of tightness at operating pipeline.2 cl, 1 dwg |
