| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for producing cleaning water capable of automatically calculating the alkali concentration of electrolytic alkali water produced in an electrolytic bath and also capable of automatically maintaining the alkali concentration of the electrolytic alkali water within the prescribed range. SOLUTION: The apparatus comprises a pH meter 12 which measures pH of the electrolytic alkali water produced in a cathode chamber 23 of the electrolytic bath 1 by electrolysis, a water temperature gauge 5 to measure the water temperature, means for calculating the alkali concentration of the electrolytic alkali water based on the measured pH, water temperature, and the formula below, and means for maintaining the alkali concentration within the prescribed range by varying the condition of the production. [FORMULA 1] [OH<SP>-</SP>]=10<SP>(p</SP>H<SP>(25)-14)</SP>mol/l; the alkali concentration, pH(25)=logK+pH(t); the pH value converted to that at the measured temperature, pH(t); the pH value at the measured temperature (t), K; the ionic product value of the electrolytic water at the measured temperature. COPYRIGHT: (C)2003,JPO
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