Method of using an electron capture type detector

Details Method of using an electron capture type detector Method of using an electron capture type detector

1992-11-20

1994-05-31

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250379, G01T 1185

Patent

active

053171594

ABSTRACT:
An electron capture type detector for gas chromatography has an ionization vessel containing therein line sources for a radioactive isotope serving as a negative electrode, a collector electrode, a purge gas route, a discharge gas route, and an end of a column disposed at its lower section. The collector electrode includes a filament made of a heat resistant material and itself connected to a heating device such that the filament can be heated to about 300.degree.-600.degree. C. so as to eliminate contaminants deposited on the collector electrode by thermal decomposition, oxidation or reduction, without the necessity of disassembling the detector itself. The contaminants are effectively removed by simultaneously causing air or hydrogen gas to pass over the collector electrode through the ionization vessel from the purge gas route to the discharge gas route.

REFERENCES:
patent: 4445037 (1984-04-01), Anderson

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