Detection of ion concentration in a liquid
US4590424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1983 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | Sep 23, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detector of ion concentration in a liquid is composed of a detection cell comprising a tubular piece formed from an electrically insulating material with a central passage which is fed with a liquid whose ion concentration is to be measured. A conducting coil is placed around the tubular piece, and is part of a first resonant circuit. A second reference resonant circuit is also provided, and signals of fixed frequency are applied in parallel to the two resonant circuits, and a comparator delivers a signal having a magnitude representative of the difference between the output signals from the two resonant circuits. Such a detector finds a use for example in liquid chromatography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.