Oxygen concentration sensing apparatus

Details Oxygen concentration sensing apparatus Oxygen concentration sensing apparatus

1987-03-19

1988-08-09

Niebling, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204412, 204425, G01N 2758

Patent

active

047626046

ABSTRACT:
An oxygen concentration sensing apparatus includes an oxygen pump element and a sensor cell element with a pair of electrodes respectively, being disposed to face each other, to form a restricted region between them, and a current source for supplying a pump current across the electrodes the oxygen pump element. A limit voltage is adjustably set in response to a voltage across the electrodes of the oxygen pump element, and the pump current supplied to the oxygen pump element is reduced when a voltage generated across the electrodes of the sensor cell element has exceeded the limit voltage.

REFERENCES:
patent: 4440621 (1984-04-01), Kitahara
patent: 4578171 (1986-03-01), Yamada et al.
patent: 4586476 (1986-05-01), Asayama
patent: 4594139 (1986-06-01), Asayama et al.
patent: 4601809 (1986-07-01), Kitahara
patent: 4609452 (1986-09-01), Shimomura
patent: 4622125 (1986-11-01), Oyama et al.
patent: 4622126 (1986-11-01), Shimomura
patent: 4702816 (1987-10-01), Hashimoto

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