| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure a water quality value at all times and to reduce power consumption. SOLUTION: A weak-voltage supply device 34 for DC electrolysis applies anode potential to a metal nipple 3-2 coming into contact with test water W and applies cathode potential to the metal oxide membranes 12-1, 12-2 of light transmitting windows 101-1, 101-2. The voltage across an anode and a cathode is minute DC electrolytic voltage Vs not generating free gas from the test water W. By this constitution, organic colloid or metal oxide colloid can be prevented from adhering to the surfaces of the light transmitting windows. Especially, this water quality meter is useful for measuring the quality value of chlorine treated water oxidizing metal ions to easily form a colored precipitated film of metal oxide.
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