Exhaust gas sensor having porous, metal-impregnated ceramic elem

Details Exhaust gas sensor having porous, metal-impregnated ceramic elem Exhaust gas sensor having porous, metal-impregnated ceramic elem

1979-03-19

1980-10-14

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

23232E, 252477R, 60276, 324 71SN, 338 22SD, G01N 2712

Patent

active

042281288

ABSTRACT:
An improved sensor having a ceramic element that undergoes a change in an electrical characteristic in response to a change in the partial pressure of oxygen in a mixture of gases to which the ceramic element is exposed. Sensors of this type are used to detect the air/fuel ratio of mixtures supplied to internal combustion engines. Prior art sensors are characterized by little change in their respective electrical characteristics at low operating temperatures. A charge transfer material, platinum or platinum/rhodium is applied to the ceramic element to facilitate or make possible the electron transfers required for sensor operation at low temperatures. Platinum/rhodium alloy is the currently preferred charge transfer material. This alloy, which preferably is 90% platinum and 10% rhodium, reduces the minimum temperature of operation for the sensor as taught herein, and it also substantially eliminates vaporization loss of the charge transfer material.

REFERENCES:
patent: 2782103 (1957-02-01), Prentiss
patent: 3200011 (1965-08-01), Baker
patent: 3479257 (1969-11-01), Shaver
patent: 3564474 (1971-02-01), Firth et al.
patent: 3645875 (1972-02-01), Record et al.
patent: 3883307 (1975-05-01), Kim
patent: 3992331 (1976-11-01), Petrow et al.
patent: 4058485 (1977-11-01), Cheung
patent: 4066413 (1978-01-01), Segawa et al.

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