Measuring and testing – Gas analysis – Gas of combustion
Patent
1998-02-06
1999-07-20
Brock, Michael
Measuring and testing
Gas analysis
Gas of combustion
204429, 204428, G01N 27407
Patent
active
059258144
ABSTRACT:
A gas sensor has a sensor cell unit which includes a detection member made up of an oxygen concentration cell, oxygen pump cell and a spacer interposed between the oxygen concentration cell and the oxygen pump cell to define therebetween a measurement gas chamber. The spacer has a pair of communicating holes for providing communication between the measurement gas chamber and the outside. Diffusion control layers made of porous material are formed within the communicating holes of the spacer so as to control flow of the detection gas into the measurement gas chamber, etc. The diffusion control layer is made of alumina and has on the outer surface thereof (i.e., on the inner peripheral surfaces thereof defining gas permeating pores) a thin Ca coating which inhibits formation of a substance which is in a liquid phase at a temperature range in which the gas sensor is used, due to reaction of the alumina forming the diffusion control layer with a suspended component of the detection gas such as phosphorus (P) in an engine exhaust gas.
REFERENCES:
patent: 5700367 (1997-12-01), Yamada et al.
patent: 5709787 (1998-01-01), Lim
patent: 5787866 (1998-08-01), Sugiyama et al.
Kawai Takeshi
Tsuzuki Masashi
Brock Michael
NGK Spark Plug Co. Ltd.
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