Constant Flow Mode vs. Constant Pressure Mode

Chromatography Forum: GC Archives: Constant Flow Mode vs. Constant Pressure Mode
Top of pagePrevious messageNext messageBottom of pageLink to this message  By Anonymous on Wednesday, January 30, 2002 - 09:25 am:

There are two modes available for GC carrier. Can anyone explain how to choose the proper mode? Are there any rules? Thanks.


Top of pagePrevious messageNext messageBottom of pageLink to this message  By Anonymous on Wednesday, January 30, 2002 - 10:32 am:

My older GCs can do only constant pressure mode, my newer Agilent ones have EPC so I can do either. Since carrier flow decreases somewhat as temperature increases, I find that I use constant flow mode when I encounter larger, less volatile compounds using temperature programming, to decrease run times.


Top of pagePrevious messageNext messageBottom of pageLink to this message  By Leon on Friday, February 1, 2002 - 03:43 pm:

The answers to these question can be found a paper [1] and in a debate [2,3] on this subject.

References:

1. Blumberg, L. M.; Wilson, W. H.; Klee, M. S. "Evaluation of Column Performance in Constant Pressure and Constant Flow Capillary Gas Chromatography ". J. Chromatogr. A 1999, 842/1-2, 15.

2. Grob, K. "Increasing GC Separation Efficiency by Electronic Pressure Control?". J. High Resolut. Chromatogr. 1994, 17, 556.

3. Blumberg, L. M.; Berger, T. A.; Klee, M. S. "Constant Flow versus Constant Pressure in a Temperature-Programmed Gas Chromatography". J. High Resolut. Chromatogr. 1995, 18, 378.


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