Tanita Corporation

Fis Inc.

Osamu Inazawa

Shinichi Harima

Kazuo Onaga

Junko Yanagitani

Kiyoshi Sagawa

A water quality analyzer comprises: sensor electrodesmade of different metals from each other, the electrodes in a liquid of inspecting object generating a sense voltage in proportion to the liquid's impurities concentration; an operational amplifier OPamplifying the sense voltage without inverting to provide for a CPU; a resistor Rwhose one end is connected to the electrode; and a voltage dividerapplying a voltage obtained by dividing the sense voltage by a prescribed division ratio to R's another end. The CPUcalculates input signal from OPto obtain chlorine concentration and displays the calculated result on a LCDin a measurement mode, and sets the division ratio of the dividerso that sense voltage across electrodessoaked in a liquid including prescribed concentration chloride approximately agrees with a reference voltage of prescribed concentration in a sense-voltage calibration mode.

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Itami, Japan

Osamu Inazawa