Oxygen concentration detection device having a pair of oxygen pump units with a simplified construction
US4769124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1986 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Aug 7, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4065
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An oxygen concentration detection device having a pair of oxygen pump units includes an oxygen-ion conductive solid electrolyte member a surface of which faces a gas retaining chamber. A measuring gas is introduced through a gas restricted region into the gas retaining chamber. The solid electrolyte member is provided with two pairs of electrodes respectively supplied with a pair of pump currents generated by a current supply circuit. The magnitude of the pump current flowing between the electrodes of one of two pairs of electrodes is controlled so that the voltage difference across the electrodes of the other one of the two pairs of electrodes is maintained at a level corresponding to a reference level. The oxygen concentration in the gas retaining chamber is detected in terms of a sum value of pump currents flowing through the two pairs of electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.