Method of measuring carbon dioxide in a liquid or gas
US4376681A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1980 |
| Grant date | Mar 15, 1983 |
| Priority date | — |
| Expiry date | Jul 21, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4162
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A carbon dioxide sensor for measuring dissolved carbon dioxide or carbon dioxide in gas is sterilizable with steam under pressure at a temperature of 120-130 degrees Celsius. The sensor comprises an outer tube having on its one end a gas-permeable membrane and a pH electrode disposed in the outer tube and supporting a spacer of poor hydrophobicity so as to be positioned between the distal end of the electrode and the membrane. For measurement of carbon dioxide, a liquid containing sodium bicarbonate is poured into the outer tube to form a layer of electrolyte at the spacer, and the outer tube is mounted on a fermentor. The pH electrode can be removed from the outer tube which is attached to the fermentor, and a membrane protecting rod can be inserted into the outer tube for sterilization of the membrane. The gas-permeable membrane can easily be replaced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.