Gas sensor

Details Gas sensor Gas sensor

1996-04-15

1997-07-01

Brock, Michael

Measuring and testing

Gas analysis

Gas of combustion

73 2503, 374 44, G01N 2718

Patent

active

056440685

ABSTRACT:
A gas sensor of the thermal conductivity type suitable for the quantitative analysis of the fuel vapor content of a fuel-air mixture. The gas sensor (10) comprises a sensing element (28) and a compensating element (30), each of which includes an electrically-heated hot member (38) incorporated into a Wheatstone bridge circuit powered by a constant current supply circuit (70). The constant current supply circuit (70) is adjusted and regulated such that the hot member (38) of the sensing element (28) is heated with an electric current of such an intensity that corresponds to a point of transition (Y) at which, at the interface of the hot member (38) and the mixture, the predominant mode of heat transfer changes from thermal conduction to natural convection.

REFERENCES:
patent: 3616677 (1971-11-01), Oppegaard
patent: 4461166 (1984-07-01), Gatten et al.
patent: 4720421 (1988-01-01), Khilmani
patent: 4813267 (1989-03-01), Norem et al.
patent: 4850714 (1989-07-01), Wieglab
patent: 4902138 (1990-02-01), Goeldner et al.
patent: 4944035 (1990-07-01), Aagerdl et al.
patent: 5348394 (1994-09-01), Hori et al.
patent: 5535614 (1996-07-01), Okamoto et al.

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