Electrochemical exhaust gas oxygen sensor construction

Details Electrochemical exhaust gas oxygen sensor construction Electrochemical exhaust gas oxygen sensor construction

1977-12-23

1980-02-05

Tung, T.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

123119E, 73 23, 55385F, 204 1IT, G01N 2746

Patent

active

041871634

ABSTRACT:
To prevent ingress of moisture, water, dirt, or other contamination into the interior of an exhaust gas sensor having an opening to provide for communication with ambient air to establish an oxygen reference level, a cover cap, preferably of metal, but which may be of plastic if extreme heat resistance is not required, is placed over the sensor, the cover cap being formed with a labyrinth which provides for communication between ambient air and the interior of the sensor, the labyrinth preferably being formed as a groove, especially a spiral groove, in the interior of the cap and having access to outside ambient air, the cap preferably being secured by means other than friction, such as a spot weld, an engagement catch or the like to the sensor housing.

REFERENCES:
patent: 2721619 (1955-10-01), Cheairs
patent: 2747101 (1956-05-01), Hammond
patent: 3698159 (1972-10-01), Ruse
patent: 3822581 (1974-07-01), Hauck et al.
patent: 3960693 (1976-06-01), Weyl et al.
patent: 4019974 (1977-04-01), Weyl et al.
patent: 4088555 (1978-05-01), Kita et al.

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