Flow regulation in gas chromatograph

Details Flow regulation in gas chromatograph Flow regulation in gas chromatograph

1995-03-01

1996-08-13

Spitzer, Robert

Gas separation: processes

With control responsive to sensed condition

Temperature sensed

95 22, 95 23, 95 82, 96102, 96103, 96105, 73 2325, 73 2327, 73 2336, B01D 1508

Patent

active

055452523

ABSTRACT:
A gas chromatographic system includes a column and an injector for delivering into the column a test portion of flow. The injector has an exit passage for discharging a split portion of carrier flow. A flow controller for regulating the inlet flow rate includes a variable outlet restrictor for the split portion, a flow rate detector disposed to detect inlet flow rate, and a feedback flow controller to regulate the outlet restrictor to maintain the inlet flow rate substantially constant. Pressure at the inlet to the injector is regulated by detecting pressure at an outlet and providing feedback control to an inlet restrictor. An integral module for the gas components is used on each side of the injector. Calibration and correction for gas characteristics are provided in the feedback for a chromatographic system and for other flow controller regulation.

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"The Effects of Inlet Liner Configuration & Septum Purge Flow Rate on Discrimination in Splitless Injection", John Hinshaw, J. of High Resolution Chromatography 16, p. 249 (Apr. 1993).
"Programmed Temperature Gas Chromatography", Walter E. Harris et al, Wiley (NY), CH 2 pp. 23-29 & 46 (1966).
"Automatic Carrier Gas Control With Self Calibrating Capabilities" P. Magni et al in 16th Int. Symp. on Capillary Chromatography 1, p. 158 (Sep. 27, 1994).
"Flow Programming In Capillary Gas Chromatography", F. Poy in Frigerio et al Recent Developments In Chromatography & Electrophresis Elsevier (1979) p. 187.
"HP 6890 Series GC System"Hewlett Packard Co. Jan. 1995.

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