Electrochemical analysis apparatus employing single ion measuring sensor
US4149949A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1978 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Jul 6, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/4925
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for measuring CO.sub.2 in serum with a single pH sensor of the electrolyte flow-through type, the sensor including a gas-permeable membrane selectively passing CO.sub.2 into an electrolyte filled space adjacent a pH sensing electrode for reacting with the electrolyte to produce a pH change therein. The electrolyte space is connected by a conduit to an electrolyte reservoir for flowing fresh electrolyte to and through the electrolyte space prior to a sample measurement. A stainless steel metal electrode directly contacts the electrolyte of constant composition in the conduit upstream of the pH sensor to derive a reference potential thereat. The potential across the pH sensor and the stainless steel electrode is monitored, differentiated, and the maximum value of the differentiated signal measured to determine the CO.sub.2 concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.