| 摘要 |
PROBLEM TO BE SOLVED: To automatically wash an examination tank to prevent the adhesion or propagation of algae. SOLUTION: In a continuous org. pollution monitor using a two-wavelength measuring method wherein water to be examined from a water examination tank 30 is allowed to flow to a sample cell (optical cell) 12 and light is transmitted through the cell 12 and the absorbancies of ultraviolet rays and visible light are measured to measure the concn. of org. matter in water to be examined, the valve of a drain 38 of the water examination tank comprises a twoway electromotive ball valve MV1 and the absorbancy measured data of visible light is inputted to an apparatus control part and this control part always monitors the absorbancy of visible light, and the valve MV1 is repeatedly opened and closed for a predetermined time every definite time by a timer in the control part and the interior of the tank is washed with a water stream to prevent the adhesion of algae or the like. If algae propagate in the tank, the absorbancy of visible light rises. The control part opens and closes the valve MV1 repeatedly when this absorbancy exceeds a predetermined value to wash the interior of the tank with a water stream to enable measurement.
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