| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect a liquid leakage position without depending on liquid leakage impedance. SOLUTION: A liquid leakage detecting device includes: a signal wire 4 transmitting current for detecting liquid leakage; a resistance wire 5, having a resistance value which is in proportional to the wire length and being connected to the signal wire, transmitting the current for detecting liquid leakage; a detection wire 6, insulation-arranged to the resistance wire, detecting a short circuit with the resistance wire; and a control part 10 detecting the liquid leakage point according to the short circuit between the resistance wire and the detection wire. When a voltage value Vb at the detection wire side exceeds a liquid leakage determination threshold value during shutting down the conduction between the signal wire and the detection wire by a Zener diode 7 which shuts down the conduction between the signal wire and the detection wire, it is determined that a liquid leakage generates, and based on the voltage value Va at the resistance wire side and the voltage value Vz from the reference point of the resistance wire to the liquid leakage point, the resistance value Rx from the reference point of the resistance wire to the liquid leakage point is computed, then the liquid leakage position on the resistance wire is computed based on the resistance value Rx and the resistance value for a prescribed length unit of the resistance wire material. COPYRIGHT: (C)2009,JPO&INPIT
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