Method and system for sub-ambient pressure control for...

Details Method and system for sub-ambient pressure control for... Method and system for sub-ambient pressure control for...

2006-11-14

2006-11-14

Hopkins, Robert A. (Department: 1724)

Gas separation: processes

Chromatography

C096S102000, C096S103000, C073S023350, C073S023360, C073S023420

Reexamination Certificate

active

07135056

ABSTRACT:
Methods and system for sub-ambient pressure control for column head pressure in gas chromatography (GC) systems. The GC system includes an inlet and a capillary column connected to the inlet. The inlet includes a valve that regulates an inlet pressure and pressure sensor that measures the inlet pressure and outputs a signal that indicates a measured inlet pressure. The GC system also includes an inlet-pressure set-point that can be set to a negative pressure set-point representing a pressure below ambient pressure, the negative pressure set-point driving the valve to change the inlet pressure until the measured inlet pressure equals the negative pressure set-point.

REFERENCES:
patent: 4141237 (1979-02-01), DeFord et al.
patent: 5952556 (1999-09-01), Shoji
patent: 2003/0126908 (2003-07-01), Furukawa
patent: 2001305118 (2001-10-01), None

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