Measuring and testing – Gas analysis – Gas chromatography
Patent
1978-03-22
1979-04-10
Swisher, S. Clement
Measuring and testing
Gas analysis
Gas chromatography
204195P, G01N 2750
Patent
active
041482115
ABSTRACT:
In apparatus for analyzing the exhaust gas of a motor vehicle, the apparatus including an oxygen sensor and means for sampling a portion of the exhaust gas and conducting the sample to the sensor, there is disclosed an improvement wherein the exhaust gas is used to heat a moisture barrier and the oxygen sensor and is then cooled before being directed through the moisture barrier to the sensitive area of the oxygen sensor. This arrangement prevents moisture from condensing on the sensitive area of the oxygen sensor, which moisture would interfere with the operation of the sensor.
REFERENCES:
patent: 3822581 (1974-07-01), Hauk
patent: 3917454 (1975-11-01), Clark
patent: 3948081 (1976-04-01), Wessel et al.
Blanke John D.
Peek Willis M.
Sawa Kenneth B.
Beckman Instruments Inc.
Harder P. R.
Kowalski F. J.
Steinmeyer R. J.
Swisher S. Clement
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