Gas detecting and measuring apparatus
US4326200A · kind A · utility
13Cited by
9References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 13, 1980 |
| Grant date | Apr 20, 1982 |
| Priority date | — |
| Expiry date | May 13, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4162
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas detecting device e.g. for detecting CO.sub.2 in air, has a vessel containing water and a layer of ion-exchange resin wetted by the water and sandwiched between air and water-permeable electrode gauze discs. Any CO.sub.2 in the ambient atmosphere dissolves in the water and the dissociated ions lower the resistance between the electrodes which may be connected to a bridge circuit adjusted to be out of balance at a predetermined CO.sub.2 concentration or which may be of dissimilar metal to form a galvanic cell with a measurable output current at a predetermined CO.sub.2 concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.