Method and device for detecting a gaseous anhydride in an oxygen bearing gas
US4295939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1979 |
| Grant date | Oct 20, 1981 |
| Priority date | — |
| Expiry date | Nov 30, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4074
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and a device for detecting a gaseous anhydride and measuring its concentration in an oxygen-bearing gas. The method comprises the following steps: (a) forming an electrolytic junction by contact between a first solid-electrolyte element containing oxyanions of the anhydride to be detected and a second, 0.sup.-- ion-conducting solid-electrolyte element such as stabilized zirconia; (b) bringing this electrolytic junction into contact with the gas containing the gaseous anhydride to be detected so as to form a triple junction; (c) creating at this triple junction a difference of potential measurable by means of two reference electrodes in contact with the first and second electrolyte elements respectively, by fixation of a constant potential in the vicinity of each of these reference electrodes, which themselves are spatially removed from the triple junction; (d) heating the triple junction to such a temperature that a logarithmic variation in the concentration of the anhydride to be detected produces a proportional, substantially linear variation in the difference of potential at the triple junction, this temperature being lower than the melting temperatures of the first and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.