Oxygen sensing apparatus and method using electrochemical oxygen

Details Oxygen sensing apparatus and method using electrochemical oxygen Oxygen sensing apparatus and method using electrochemical oxygen

1994-02-22

1995-05-09

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204425, 204426, 204427, 204429, 20415318, G01N 2726

Patent

active

054136830

ABSTRACT:
An oxygen sensing apparatus for detecting an oxygen concentration of a gas is disclosed. The apparatus includes a first electrochemical cell having an oxygen-ion conductive solid electrolyte body and a reference and a measuring electrode, for producing an electromotive force which corresponds to the oxygen concentration of the gas. A reference-gas chamber formed around the reference electrode is provided with a reference gas by an oxygen pumping action of the first electrochemical cell. The apparatus further includes a second electrochemical cell including a solid electrolyte body and a pair of electrodes, one disposed in a measurement-gas chamber formed around the measuring electrode, and the other exposed in an external space. The measurement-gas chamber is provided with an oxygen gas by an oxygen pumping action of the second electrochemical cell to feed oxygen from the external space into the measurement-gas chamber. Also disclosed is a method of detecting an oxygen concentration using the above-described apparatus.

REFERENCES:
patent: 4272329 (1981-06-01), Hetrick et al.
patent: 4765880 (1988-08-01), Hayakawa et al.

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