Sample presence detector for automatic sample injector
US4926702A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1987 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Sep 18, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N30/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detector for detecting the presence of an electrically conductive sample solution in a sample injection metering valve by electrical sensing the leading edge of the sample solution, wherein the amount of sample solution in excess of the metered amount required to cause detection is minimized. A conductive probe is positioned on the valve body just downstream of the sample metering passage of the valve, the probe being electrically insulated from the valve body. The probe and valve body form electrodes which will detect the arrival of the leading edge of a conductive sample solution which completes a conductive circuit between the electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.