| 摘要 |
PURPOSE:To detect the pressure in the piping and a variation of the pressure by changing a vibrator by the density of gas which is a medium and reading a variation of the impedance. CONSTITUTION:In a usual state, the gas is passed through the interruption surface 9 from a bomb 8 and induced to the piping 13 at the detector side via a pressure variation detecting part (the primary side) 16, a pressure-reducing valve 10, the pressure variation detecting part (the secondary side) 16 and a three-way valve 11. In case the opening of the bomb 8 is forgotten, since the sound impedance which is transmitted from the pressure variation detecting part (the primary side) 16 to an impedance meter 6 is changed, a signal is transmitted from the impedance meter 6 to an alarm device 7 to sound an alarm. Further, in case of the flowing-out of the pressure-reducing valve 10, since the sound impedance which is transmitted from the pressure detecting part 16 at the secondary side to the impedance meter 6 is changed, the signal is transmitted from the impedance to the alarm device 7 and the three-way valve 11 is changed over by the signal from the alarm device 7 and the gas can be induced to a discharge system 14 via a check valve 12. |
