EP0030164A2
Expired / Lapsed
EP
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An oxygen concentration detector and a method of detecting oxygen concentration
Assignee: NGK Insulators Ltd
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Filing: 1980-12-04
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Granted: —
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Expires: 2000-12-04
Abstract
Abstract In a detector (11) for measuring the oxygen concentration of a gaseous mixture such as automobile gas by using the principle of an oxygen concentration cell made of an oxygen ion conductive solid electrolyte body (1) with electrodes (2,3) mounted on opposite surfaces thereof, the detector and the method according to the invention use AC voltage electrode means provided on the solid electrolyte body- to apply an AC voltage thereto for heating the detector. AC power supplying means to heat the solid electrolye body by passing electric current there-through may comprise an AC power source (7) and the electrodes forming the oxygen concentration cell, or may alternatively comprise an AC power source and at least one AC electrode (4) separate from the electrodes forming the oxygen concentration cell.
Inventors
- 👤 Syunzo Mase
- 👤 Shigeo Soejima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 17:33
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/4067
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
An oxygen concentration detector (11) for detecting oxygen concentration of a gas, comprising an oxygen ion conductive solid electrolyte body (1) and electrodes (2,3) mounted on opposite surfaces of the said solid electrolyte body so as to form an oxygen concentration cell, characterized by AC power supplying means to heat the solid electrolyte body by passing electric current therethrough.
Claim 2
Dependent Claim
59 words
An oxygen concentration detector (11) for detecting oxygen concentration of a gas, comprising an oxygen ion conductive solid electrolyte body (1) and electrodes (2,3) mounted on opposite surfaces of the said solid electrolyte body so as to form an oxygen concentration cell, characterized by AC power supplying means to heat the solid electrolyte body by passing electric current therethrough.
Claim 3
Dependent Claim
32 words
An oxygen concentration detector as claimed in claim 1, characterized in that the said AC power supplying means comprises an AC power source (7) and the said electrodes forming the oxygen concentration-cell.
Claim 4
Dependent Claim
41 words
An oxygen concentration detector as claimed in claim 1, characterized in that the said AC power supplying means comprises an AC power source (7) and at least one AC electrode .(4) separate from the said electrodes forming the oxygen concentration cell.
Claim 5
Dependent Claim
55 words
An oxygen concentration detector as claimed in claim 2 or 3, characterized by further comprising means for detecting selectively the DC voltage level from the terminal voltage of the detector, and means for preventing current due to the DC voltage level of the terminal voltage of the detector from flowing into the AC power source.
Claim 6
Dependent Claim
35 words
An oxygen.concentration detector as claimed in any of claims 2 to 4, characterized by further comprising means for separating a circuit connected to the AC power source from the terminal of the oxygen concentration detector.
Claim 7
Dependent Claim
78 words
An oxygen concentration detector (11) for detecting oxygen concentration of a gas, comprising an oxygen ion conductive solid electrolyte body (1) and electrodes (2,3) mounted on opposite surfaces of the said solid electrolyte body so as to form an oxygen concentration cell, characterized by AC electrode means (4) provided on the solid electrolyte body, the said AC electrode means being adapted to receive an AC voltage to cause an AC current to flow through the solid electrolyte body.
Claim 8
Dependent Claim
78 words
An oxygen concentration detector (11) for detecting oxygen concentration of a gas, comprising an oxygen ion conductive solid electrolyte body (1) and electrodes (2,3) mounted on opposite surfaces of the said solid electrolyte body so as to form an oxygen concentration cell, characterized by AC electrode means (4) provided on the solid electrolyte body, the said AC electrode means being adapted to receive an AC voltage to cause an AC current to flow through the solid electrolyte body.
Claim 9
Independent Claim
83 words
A method of detecting oxygen concentration by detecting oxygen partial pressure of a gas, comprising forming an oxygen concentration cell by mounting electrodes (2,3) on opposite surfaces of an oxygen ion conductive solid electrolyte body (1), characterized by applying an AC voltage to the said solid electrolyte body so as to generate heat in the solid electrolyte body, and measuring the voltage across the said electrodes under the thus heated conditions, the said voltage across the electrodes representing the oxygen concentration being detected.
Claim 10
Independent Claim
83 words
A method of detecting oxygen concentration by detecting oxygen partial pressure of a gas, comprising forming an oxygen concentration cell by mounting electrodes (2,3) on opposite surfaces of an oxygen ion conductive solid electrolyte body (1), characterized by applying an AC voltage to the said solid electrolyte body so as to generate heat in the solid electrolyte body, and measuring the voltage across the said electrodes under the thus heated conditions, the said voltage across the electrodes representing the oxygen concentration being detected.
Claim 11
Dependent Claim
43 words
A method as claimed in claim 7, characterized in that the said AC voltage being applied to the said solid electrolyte body has that frequency which causes an AC polarization of the oxygen concentration cell mostly as polarization of the solid electrolyte body.
Claim 12
Dependent Claim
42 words
A method as claimed in claim 8, characterized in that the said frequency is such that the said polarization of the solid electrolyte body is mostly that polarization which is due to electrical resistances of crystal grains of the solid electrolyte body.
References Cited (Backward Citations)
No citation records indexed.
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