Electrochemical oxygen sensor, particularly for use in the exhau

Details Electrochemical oxygen sensor, particularly for use in the exhau Electrochemical oxygen sensor, particularly for use in the exhau

1980-02-14

1981-07-07

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

G01N 2758

Patent

active

042773237

ABSTRACT:
To improve the response speed of an electrochemical oxygen sensor, particularly for automotive use, to sense the oxygen content in exhaust gases, and which can be operative either as a polarographic sensor (requiring application of a voltage thereto), or as a potentiometric sensor (having one catalytically active electrode and another which is less catalytically active), an elongated insulating carrier plate (29), for example of a ceramic, has layer electrodes (30, 31) applied to one major surface thereof and a layer of solid electrolyte material (32) over the electrodes, so that the electrodes will be embedded in the solid electrolyte material. The carrier plate (29) is of a material pervious to oxygen molecules. A gas-impervious insulating cover (33), for example of a ceramic glass, covers the layer of solid electrolyte material (32). A heating element (34) protected by a protective cover (35), for example of aluminum oxide, can be applied against the gas-impervious cover layer (33).

REFERENCES:
patent: 3691023 (1972-09-01), Ruka et al.
patent: 3719564 (1973-03-01), Lilly et al.
patent: 4107019 (1978-08-01), Takao et al.
patent: 4145272 (1979-03-01), Nakamura et al.
patent: 4157282 (1979-06-01), Riddel
patent: 4157948 (1979-06-01), Maurer
patent: 4177125 (1979-12-01), Barnabe

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