Gas concentration sensor with dose monitoring
US4896143A · kind A · utility
39Cited by
10References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1987 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Apr 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/124
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tin oxide carbon monoxide sensor is operated in a manner to exclude effects of ambient temperature and humidity. Resistance of the sensor is measured at a lower temperature and again at a higher temperature. The target gas concentration is determined as a function of the first and second resistances, thereby cancelling the effects of humidity and ambient temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.