Patent ID: 7867325

Claim:
A gas chromatographic device comprising an inlet system, and a chromatography column, the inlet system including a liner having pressure reducing means contained therein for reducing pressure between an inlet of the pressure reducing means and an outlet of the pressure reducing means, the chromatography column when in use being positioned at its inlet in the liner downstream from the pressure reducing means, and the chromatography column when in use being under vacuum at its outlet, the liner having a passageway extending therethrough between its inlet and its outlet, and the passageway having a pressure reducing portion having a cross section smaller than that of the passageway upstream thereof, the liner having a surface along the passageway downstream of the pressure reducing portion of the passageway which when the device is in use contacts an inlet portion of the chromatography column, and the passageway of the liner at the pressure reducing portion containing an integral porous body of frit material inside the passageway.