| 摘要 |
PROBLEM TO BE SOLVED: To provide a bathtub water cleaning apparatus capable of accurate measurement of the concentration of chlorine. SOLUTION: Bathtub water is discharged into a measurement tank 1 if necessary and the amount of chlorine is measured with a chlorine sensor 2. Chlorine of high concentration is injected into the measurement tank 1, the concentration of chlorine is measured hereat, water nearly free from chlorine is poured into the measurement tank 1 and the concentration of chlorine is similarly measured hereat. A failure of the chlorine sensor 2 is detected on the basis of these measured values. COPYRIGHT: (C)2003,JPO
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