Diagnostic method and apparatus for solid electrolyte gas analyzer
US5980728A · kind A · utility
55Cited by
32References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1996 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Sep 24, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4175
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A solid electrolyte gas analyzer is equipped with a diagnostic circuit that intermittently measures an impedance of the solid electrolyte measurement cell as an indication that the cell is in need of calibration or replacement. The diagnostic operation is performed on the cell in situ, i.e., while the solid electrolyte cell is exposed to the gas to be measured and heated to a controlled elevated temperature. Preferably the cell impedance is measured at a predetermined frequency by injecting a modulated current through the cell and measuring the resulting voltage drop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.