Photoionization detector for gas chromatography

Details Photoionization detector for gas chromatography Photoionization detector for gas chromatography

1987-12-04

1989-02-14

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250288, 250382, 250423P, 250432R, 324465, H01J 2724, G01N 2100

Patent

active

048048461

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.

REFERENCES:
patent: 3933432 (1976-01-01), Driscoll
patent: 4013913 (1977-03-01), Driscoll et al.
patent: 4028617 (1977-06-01), Kamo et al.
patent: 4063156 (1977-12-01), Patterson
Lovelock, J. E., "Ionization Methods for the Analysis of Gases and Vapors," Analytical Chemistry, vol. 33, No. 2, pp. 162-178 (Feb. 1961).
Patterson, P. L., "A Comparison of Different Methods of Ionizing GC Effluents," Journal of Chromatographic Science, vol. 24, pp. 466-472 (Nov. 1986).
Driscoll, J. N., and Staziana, F. F., "PID Development Gives New Performance Levels," Reprinted from Research/Development, vol. 27, No. 5, pp. 50-52 and 54 (May 1976).
Lovelock, J. E., "A Protoionization Detector for Gases and Vapors," Nature, vol. 188, No. 474a, p. 401 (Oct. 29, 1960).

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