Gas sensor element having at least two cells

Details Gas sensor element having at least two cells Gas sensor element having at least two cells

2005-08-30

2005-08-30

Olsen, Kaj K. (Department: 1753)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S426000, C204S428000, C073S023320

Reexamination Certificate

active

06936148

ABSTRACT:
A sensor element including an insulative base (11), a heating resistor (12), an oxygen pump cell (13), an oxygen detection cell (14), and a diffusion-chamber-forming member (161) having a rate-controlling introduction portion (163) and defining a diffusion chamber (16) in cooperation with electrodes (1321, 1421), wherein these components have been subjected to simultaneous firing (i.e., cofiring) to form a unitary sensor element. A partition wall (162), which extends from the diffusion-chamber-forming member and is made of alumina, is joined to a surface of a solid electrolyte (131) between two electrodes (1321, 1322) of an Ip cell. Preferably, a region within 20 μm from the plane of junction joining the partition wall (162) to the solid electrolyte (131) contains no portion whose amount of non-alumina substances exceeds by 2% by mass (by weight) or more the amount of non-alumina substances of the diffusion-chamber-forming member (161).

REFERENCES:
patent: 4264425 (1981-04-01), Kimura et al.
patent: 4505807 (1985-03-01), Yamada
patent: 4647364 (1987-03-01), Mase et al.
patent: 6007688 (1999-12-01), Kojima et al.
patent: 6007697 (1999-12-01), Yagi et al.
patent: 6153071 (2000-11-01), Omara et al.

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