Gas sensor

Details Gas sensor Gas sensor

1978-10-23

1981-03-31

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

123489, G01N 2712

Patent

active

042585635

ABSTRACT:
A gas sensor including a gas sensing element whose electrical resistance varies in accordance with the gas composition in the exhaust gas, especially the oxygen content in the exhaust gas, and a reference resistor connected in series with the gas sensing element. A predetermined voltage is applied across the series circuit of the gas sensing element and the reference resistor to detect the gas composition in the exhaust gas by a voltage at the junction point of the gas sensing element and the reference resistor. The gas sensor further comprises a circuit for monitoring the voltage at the junction point and another circuit responsive to the monitoring circuit to change the resistance of the reference resistor so that when the voltage at the junction point exceeds the predetermined range, the resistance of the reference resistor is changed such that the voltage at the junction point may change within the predetermined range in the state after the reference resistor is changed to ensure that the voltage at the junction point properly indicates the gas composition even if the resistance of the gas sensing element changes with the operating temperature of the gas sensing element or with time.

REFERENCES:
patent: 3868846 (1975-03-01), Kushida et al.
patent: 3932807 (1976-01-01), Wilson
patent: 4063447 (1977-12-01), Mathison
patent: 4112356 (1978-09-01), Toy
patent: 4147513 (1979-04-01), Bienkowski et al.

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