Gas sensing apparatus

Details Gas sensing apparatus Gas sensing apparatus

1980-03-05

1981-12-01

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

73 27R, 324 71SN, 338 22SD, 422 98, 123440, G01N 2704, G01N 2716

Patent

active

043036139

ABSTRACT:
A gas sensing apparatus for sensing the air-fuel ratio in an internal combustion engine has two sinter elements fixed to the tip of a tubular ceramic body and both of the sinter elements are made of metal oxide which exhibits an electrical resistance change in response to changes in the component and temperature of the exhaust gas. One of the sinter elements carries a catalyst to promote the oxidation reaction of the gas component and the other sinter element which does not carry a catalyst and connected in series to the one sinter element serves for temperature compensation of the electrical resistance change of the one sinter element. A fixed resistor having a resistance value considerably smaller than that of the other sinter element not carrying a catalyst at low exhaust gas temperature is connected in parallel with the other sinter element to maintain the apparent resistance of the other sinter element at small values at the low exhaust gas temperature.

REFERENCES:
patent: 4112893 (1978-09-01), Anzai
patent: 4147513 (1979-04-01), Bienkowski et al.
patent: 4149502 (1979-04-01), Johnson et al.
patent: 4208786 (1980-06-01), Merchant et al.

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