Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1998-06-11
2000-09-19
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204425, 204426, 204427, 205781, 2057845, 2057865, 205788, G01N 27407
Patent
active
061206636
ABSTRACT:
Disclosed is a gas sensor comprising a main pumping cell for pumping-processing oxygen in a first chamber; an auxiliary pumping cell for pumping-processing oxygen in a second chamber; and a measuring pumping cell for pumping-processing oxygen in a measurement gas introduced through a third diffusion rate-determining section; wherein a NOx component contained in the measurement gas is measured on the basis of a pumping current flowing through the measuring pumping cell. The gas sensor further comprises a heater for heating at least the main pumping cell, the auxiliary pumping cell, and the measuring pumping cell to predetermined temperatures; an impedance-detecting circuit for detecting an impedance between an inner pumping electrode and an auxiliary pumping electrode; and a self-diagnosis unit for comparing an impedance value detected by the impedance-detecting circuit with a prescribed value to decide whether or not any trouble occurs, on the basis of a result of comparison. Accordingly, it is possible to provide the gas sensor which has a self-diagnosis function capable of quickly and reliably detecting whether or not the gas sensor has any trouble.
REFERENCES:
patent: 4167163 (1979-09-01), Moder
patent: 4609453 (1986-09-01), Shimomura
patent: 5672811 (1997-09-01), Kato et al.
patent: 5709198 (1998-01-01), Sagisaka et al.
patent: 5763763 (1998-06-01), Kato et al.
Hamada Yasuhiko
Kato Nobuhide
NGK Insulators Ltd.
Tung T.
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