Make-up gas FID detector

Discussions about GC and other "gas phase" separation techniques.

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Does someone already have result variability depending make-up gas used (He and N2) and make-up gas flow?

You may see a difference in baseline depending on the gas used. We use nitrogen makeup and set column + makeup = constant = 30 mL/min. This has always worked well for us. If using helium it may be cost effective to switch to nitrogen.

The construction of modern flame detectors is the same as for old FID for packed columns and relations for carrier gas/H2/air: 1:1:10 is the same also. Because total flows of FID are classic also: 30ml/min carrier (capillary column+make-up) and H2, and 300 mi/min - air. Carrier gas for column and make-up are wishing the same also.
3 posts Page 1 of 1

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