Measuring and testing – Gas analysis – Gas of combustion
Patent
1994-11-07
1996-07-16
Brock, Michael J.
Measuring and testing
Gas analysis
Gas of combustion
73 2503, 73 2505, 374 44, 338 22R, 338235, 338229, G01N 2718
Patent
active
055356141
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.
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Miyake Kuniaki
Okamoto Eiji
Brock Michael J.
NOK Corporation
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