Tanita Corporation

Fis Inc.

Kiyoshi Sagawa

Shinichi Harima

Kazuo Onaga

Junko Yanagitani

Osamu Inazawa

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.

Water quality analyzer

A residual chlorine meter detects a pre-calibration residual chlorine reaction amount of sample water in a detection section, inputs a calibration standard residual chlorine standard concentration of the sample water in an input section, determines calibration factors from data for computing the calibration factors based on the amount and the concentration stored in a calibration factor computation data storage section in a calibration factor computation section, and stores the calibration factors in a calibration factor storage section. Then, the meter detects an on-measurement residual chlorine reaction amount of the sample water in the detection section and determines a post-calibration residual chlorine concentration of the sample water from data for computing the post-calibration residual chlorine concentration based on the on-measurement residual chlorine reaction amount and the calibration factor stored in a residual chlorine concentration computation data storage section in a residual chlorine concentration computation section.

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Tokyo, Japan

Kiyoshi Sagawa