Photoionization detector for gas chromatography
US4804846A · kind A · utility
14Cited by
4References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1987 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Dec 4, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2030/642
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved photoionization detector has a sweep gas inlet which is used to introduce sweep gas near the window of the detector's ultraviolet lamp. The detector's chamber has a vent which allows selective removal of spurious analyte. The detector is adapted to have directly mounted on it, a second detector. Sweep gas used to keep analyte away from the window may be used as a reagent in the second detector. In addition, a means for regulating the ionization lamp voltage is disclosed which prolongs lamp life expectancy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.