High sensitivity conductivity detector
US4672322A · kind A · utility
15Cited by
8References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1984 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Aug 24, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/07
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A high sensitivity conductivity detector for ion chromatography includes an isolated fluid cell and a measuring circuit including an operational amplifier having its input connected to the center tap of a transformer. Feedback from the operational amplifier maintains the center tap at virtual ground potential. The excitation voltage for the transformer is supplied by two operational amplifiers. A thermoelectric semiconductor device maintains the temperature of the sample cell at a constant, ambient temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.