Acidic gas sensors and method of using same
US5071526A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1988 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | May 27, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4045
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a sensor, preferably an electrochemical sensor, for detecting acidic gases, e.g. carbon dioxide. The electrochemical sensor has a sensing electrode (20, 22), a counter electrode (37) and a body of electrolyte containing a complex, e.g. copper(II) bis(propanediamine), which has one or more ligands that is displaceable by the presence of the acidic gas in the electrolyte to form a modified complex which can be electrochemically reacted at the sensing electrode at a potential at which the unmodified complex is unreactive. The acidic gas diffuses into the electrolyte through a porous membrane. The modified complex can also be detected colorimetrically because it absorbs light at a different wavelength to the unmodified complex.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.