| 摘要 |
PROBLEM TO BE SOLVED: To protect a water-passing path from damage in advance by monitoring the degree of fatigue in accumulator, to give a warning before the accumulator cannot function any more, or to prohibit the passage of water in the water passage path. SOLUTION: Water passage or close-down in the water passage path 20 is detected by a circulation water flow rate sensor 22, and the number is counted. The count number N is compared with a specific alarm threshold M, and an alarm is given when the count number N exceeds the alarm threshold value M.
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