Carrier Gas and Sensitivity in Gas Chromatography

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Abstract

WHILE it is true that a higher sensitivity can be obtained by using a higher bridge current, it is not usually possible to do this with commercial gas chromatography instruments, because manufacturers wisely limit the supply voltage to a level at which the katharometer filaments do not fuse in air or nitrogen. Even with home-made instruments the bridge supply voltage may be a limiting factor, since to maintain the same filament temperature in helium as in argon the voltage must be increased nearly three times.

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RAY, N. Carrier Gas and Sensitivity in Gas Chromatography. Nature 184, BA54 (1959) doi:10.1038/184054b0

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