Gas sensor for determining the concentration of gas...

Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For nitrogen or nitrogen containing compound

Reexamination Certificate

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C205S784500, C204S425000, C073S023310

Reexamination Certificate

active

07052595

ABSTRACT:
A gas sensor for determining the concentration of gas components in gas mixtures is used in particular to measure the concentration of nitrogen oxides in exhaust gases of internal combustion engines or in the interiors of motor vehicles. It contains an electrochemical measuring cell which includes a first electrode situated on a solid electrolyte and an additional electrode. The electrode is made of an oxide material containing lanthanum which at least catalytically decomposes nitrogen oxides. The pump current flowing between the electrodes is used as a measure of the nitrogen oxide concentration in the gas mixture.

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Inoue et a, J. Electrochem. Soc., 137(8), pp. 2523-2527, 1990.
Logothetis et al, High-Temperature Oxygen Sensors Based on Electrochemical Oxygen Pumping, pp. 136-154, ACS Symposium Series 309, 19986.

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