| 摘要 |
PROBLEM TO BE SOLVED: To prevent the contact between purified water and a level gauge and the quality lowering of the purified water caused by the contamination of the level gauge by installing a means for measuring the position of a liquid surface which is not in contact with the purified water in a purified water storage tank, in an apparatus for producing the purified water equipped with the storage tank having a sterilizing lamp. SOLUTION: A reverse osmosis membrane module 2 is incorporated in a purified water producing apparatus 1, and raw water 3 is sent into the module 2 through a pre-treatment apparatus 6 by a pressure pump 9. Purified water 4 separated from the raw water 3 is collected in a storage tank 7. The storage tank 7 is equipped with a sterilizing lamp 15 to control the propagation of bacteria mixed into the purified water 4 in the tank 7, and two level sensors are fitted to the outer wall of the tank 7 with the contact with the purified water 4 in the tank 7 avoided. When the level position of the purified water 4 stored in the tank 7 comes to the position of the upper level sensor, the pump 9 is stopped.
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