Measuring electrode device
US4440620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1982 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Dec 14, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/333
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring electrode device comprises a pH electrode arranged within an outer casing and having a pH sensitive member in contact with an electrolyte housed in the outer casing. The electrolyte reacts with a predetermined gas in a liquid to be inspected and varies its pH. The pH sensitive member includes a semiconductor substrate and a pH sensitive membrane formed on the substrate and in contact with the electrolyte. The pH sensitive membrane is formed of at least one element selected from the group consisting of silicon nitride, aluminum oxide and tantalum pentoxide. A potential difference is produced between the pH sensitive membrane and the electrolyte in accordance with the variation of the pH of the electrolyte. Thus, a potential difference is produced between the pH electrode and a reference electrode according to the variation of the pH of the electrolyte.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.