Oxygen concentration sensing apparatus

Details Oxygen concentration sensing apparatus Oxygen concentration sensing apparatus

1987-03-19

1989-02-14

Niebling, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204412, 204425, 204426, G01N 2758

Patent

active

048044547

ABSTRACT:
An oxygen concentration sensing apparatus includes an oxygen pump element and a sensor cell element to be placed in a gas under measurement, and a device for generating a voltage value command indicating a voltage to be generated across electrodes of the sensor cell element. A current limit device is provided so that the supply of the voltage value command is stopped to decrease a pump current to the oxygen pump element gradually when the voltage generated across the electrodes of the sensor cell element exceeds a first predetermined voltage, and the pump current to the oxygen pump element is reduced immediately when the voltage generated across the electrodes of the sensor cell element exceeds a second predetermined voltage which is higher than the first predetermined 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), Ogama et al.
patent: 4622126 (1986-11-01), Shimomura
patent: 4702816 (1987-10-01), Hashimoto

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