| 摘要 |
PURPOSE:To install piping easily regardless of whether the piping is installed newly or already installed, and to detect whether fluid flows in the piping easily. CONSTITUTION:When water is fed through a valve, its sound is sensed by an acoustic sensor 11 and a continuous signal with large amplitude appears between output terminals of the acoustic sensor 11, i.e. core wires 19c an 19b. This signal is converted by a window comparators 34 into a pulse signal, which is counted by a counter 35. The counter 35 is reset by the rising of an output pulse of an oscillator 36, so the counter counts until a final bit goes up to ''1'' within a period (one second) between some resetting point and the next resetting point, and then sends its output. Then, when the final bit of the counter 35 is ''1'' and the output of the oscillator 36 is at a high level, an AND gate 37 is opened and a display 39 indicates a flow state. |
