Gas concentration sensor

Details Gas concentration sensor Gas concentration sensor

1996-01-23

1998-07-28

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, 204428, G01N 27407

Patent

active

057858292

ABSTRACT:
An oxygen concentration sensor according to the present invention, which can introduce a large amount of air into the atmospheric chamber easily and can sustain stable detecting characteristics for a long time, includes a sensor element having a first end exposed to measured gas and a second end exposed to atmospheric gas, a cover for covering the second end of the sensor element; and a water repellent member disposed in the cover. In the cover, a space is formed to introduce atmospheric gas therethrough to the sensor element. The cover further includes an outer ventilation hole to introduce atmospheric gas into the space. The water repellent member divides the space into an inner space and an outer space between the sensor element and the outer ventilation hole. Each cross-sectional area of air passages in the inner space and the outer space is larger than that of the air passage of the outer ventilation hole.

REFERENCES:
patent: 4116797 (1978-09-01), Akatsuka
patent: 4323440 (1982-04-01), Akatsuka
patent: 4502939 (1985-03-01), Holfelder et al.
patent: 4765881 (1988-08-01), Wertheimer et al.
patent: 4786397 (1988-11-01), Barbieri et al.
patent: 4883643 (1989-11-01), Nishio et al.

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