Oxygen sensing device having solid electrolyte cell and means fo

Details Oxygen sensing device having solid electrolyte cell and means fo Oxygen sensing device having solid electrolyte cell and means fo

1982-06-08

1984-08-07

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204 1T, 204424, 204426, 204429, G01N 2746

Patent

active

044642440

ABSTRACT:
A device for detecting concentrations of oxygen in gases by using an oxygen sensor element having a substrate provided with a heater and a concentration cell part in the form of a laminate including a solid electrolyte layer supported on the substrate. The device has a power supply circuit to apply a controlled voltage to the heater to keep it at a constant temperature by controlling its resistance to a constant value, and a current supply circuit which forces a controlled DC current to flow through the solid electrolyte layer in the sensor element to thereby maintain a reference oxygen partial pressure in the sensor element. The current supply circuit is electrically associated with the power supply circuit so as to vary the intensity of the current in inverse proportion to the voltage applied to the heater for the purpose of maintaining the reference oxygen partial presure constant even when the temperature of the concentration cell part of the sensor element varies depending on the temperature of the gas subject to measurement.

REFERENCES:
patent: 3616274 (1971-10-01), Eddy
patent: 4135381 (1979-01-01), Sherwin
patent: 4207159 (1980-06-01), Kimura et al.
patent: 4224113 (1980-09-01), Kimura et al.
patent: 4332225 (1982-06-01), Cox et al.
patent: 4359030 (1982-11-01), Sone et al.

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