| 摘要 |
PURPOSE:To allow one water leak detector to decide on a leak position by measuring the waveform obtained by differentiating the detected values of hydrogen concentration of a water leak detection system twice, and knowing the distance between a detection point and the leak point from the stepwise extent of the waveform. CONSTITUTION:Detected hydrogen concentration 14 is differentiated by twice by differentiation circuits 15 and 16 and the result is stored. Data 18 for evaluation on the correlation between the amplitude of the twice differentiated value and the leak position is set up in another storage device. Further, the data 18 for evaluation is corrected by the flow 19 of a secondary system measured by a flow meter to set up calibration data 20 on the correlation between the amplitude of the twice differentiated value of the secondary system flow meter in a water leak accident and the leak position. Then, the calibration data 20 is compared with data at the time of the accident which is read out of the storage device 17 to decide on and display the leak position. Thus, one water leak detector decides on the leak position. |
