Sleeve units for inlet splitters of capillary gas chromatographs

A method of mixing a sample gas and a carrier gas into a uniform gas mixture and delivering the gas mixture to the inlet end of a capillary tube of a gas chromatograph for analysis, comprising the steps of

• providing a tubular liner having a bore, an inlet expansion chamber in the bore for changing a liquid sample to a sample gas, a mixing chamber in the bore next to the inlet chamber, a spiral core baffle in fixed position inside the mixing chamber for thoroughly mixing the sample gas and the carrier gas into a uniform gas mixture by guiding the sample gas and carrier gas into a fixed spiral path around the fixed spiral core baffle between the baffle and the liner, and an outlet chamber next to the mixing chamber for delivering the thoroughly mixed sample and carrier gases to an inlet end of a capillary tube of a gas chromatograph,
• inserting a liquid sample into the inlet expansion chamber,
• heating the liquid sample in the expansion chamber to expand it into a gas sample,
• inserting a carrier gas into the inlet expansion chamber,
• moving the sample gas and the carrier gas into the mixing chamber,
• moving the sample gas and carrier gas in a fixed spiral path around the fixed spiral core baffle between the baffle core and the liner to thoroughly mix the gases together into a uniform gas mixture,
• delivering the gas mixture to the outlet chamber, and
• delivering a portion of the gas mixture to the inlet end of a capillary tube of a gas chromatograph.