Apparatus with polarographic sensor to detect concentrations of

Details Apparatus with polarographic sensor to detect concentrations of Apparatus with polarographic sensor to detect concentrations of

1984-05-24

1986-03-18

Niebling, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204425, 204426, 204429, 123440, 123489, G01N 2748

Patent

active

045767050

ABSTRACT:
An apparatus for detecting concentrations of a plurality of gas components has a single polarographic sensor capable of detecting an oxygen concentration and a composite concentration of oxygen gas, carbon dioxide gas and steam. A first voltage is applied to the polarographic sensor which then measures only the oxygen concentration, or a second voltage is applied to the sensor which then measures only the composite concentration of oxygen gas, carbon dioxide gas and steam. The first and second voltages are applied to the sensor in a time division manner. Upon application of first and second voltages in such a time division manner, corresponding currents flowing through the sensor are detected to obtain signals corresponding to the oxygen concentration and the composite concentration of oxygen gas, carbon dioxide gas and steam. The signal corresponding to the oxygen concentration is subtracted by an operational amplifier from the signal corresponding to the composite concentration of oxygen gas, carbon dioxide gas and steam, thereby obtaining a signal representing a composite concentration of carbon dioxide gas and steam.

REFERENCES:
patent: 3208926 (1965-09-01), Eckfeldt
patent: 3860498 (1975-01-01), Jones
patent: 4408584 (1983-10-01), Yabuhara et al.
patent: 4472262 (1984-09-01), Kondo et al.

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