G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/409 (2006.01) G01N 27/407 (2006.01)
Patent
CA 2151322
An oxygen concentration detector includes a one-end closed cylindrical oxygen sensing element having an inside electrode, outside electrode provided on the inner side and outer side respectively, an electrode protecting layer made up of ceramics porous member provided further outside the outside electrode, and a trap layer 1 of ceramics porous member having a surface roughness of 20 to 100 µm measured according to a 10 point mean roughness measurement and provided outside the electrode protecting layer is employed. By dipping the to-be- detected gas side surface of an oxygen sensing element into a slurry with coarse heat-resisting metal oxide particles, 2 to 50 µm in average grain size, dispersed, depositing the slurry on the surface of a protective layer of an oxygen sensor element, thereafter drying and baking the deposit, a porous poisonous substance trap layer, 10 to 500 µm thick, is formed. The dipping is performed after a previous degassing and strong stirring of said slurry and the stop of stirring.
Fujii Namitsugu
Hotta Yasumichi
Sano Hiromi
Shibata Masahiro
Sugino Hiroshi
Fetherstonhaugh & Co.
Nippondenso Co. Ltd.
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