| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the fouling of an electrode part while being installed in seawater without any lifting. SOLUTION: Normally, the potential difference in seawater is detected by electrodes 11A and 11B and is amplified by an amplification part 12, and an output signal is outputted to ground equipment 3 by a cable part 2. Selection switches 14A and 14B, are thrown to the side of a selection terminal (b) by a control signal from the ground equipment 3 on washing. As a result, current flows from a power supply part 13 back to it via the selection switch 14A, the electrode 11A, seawater, the electrode 11B, and the selection switch 14B, in this order.
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