Photoionization detector for gas chromatography
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United States of America Patent
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Feb 14, 1989
Grant Date -
N/A
app pub date -
Dec 4, 1987
filing date -
Dec 4, 1987
priority date (Note) -
Expired
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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.
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