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  • Category :  Agilent Knowledge Portal
  • Entry Type :  Article
  • Product Type :  GC Systems
  • Component :  GC System
  • Product Name :  6850 GC System 6890 GC System 7820 GC System 7890 GC System 8850 GC System 8860 GC System 8890 GC System Intuvo 9000 GC System
  • Task :  Best Practices Operation
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Recommended GC Column (Carrier) Gas Flow Rates

Answer

This Information Applies To: Agilent GC Systems 8890/8860/Intuvo 9000 /7890/7820/6850/6890

Issue

General guidance on GC column flow rates, outlining the correct column flow rate for optimal compound separation depends on the column internal diameter.

The column flow rates in Table 1 are typical for all column temperatures. To further refine suitable flow rates for the particular application, see this article on how to use Agilent GC Calculators.

  
Warning: When using hydrogen (H2), as the carrier gas, be aware that hydrogen (H2) gas can flow into the oven and create an explosion hazard. Therefore, be sure that the supply is off until all connections are made, and ensure that the inlet and detector column fittings are either connected to a column or capped at all times when hydrogen (H2) gas is supplied to the instrument.

 

Column type Column size Carrier flow rate, mL/min
Hydrogen Helium Nitrogen
Packed 1/8-inch Do not use 30 20
1/4-inch Do not use 60 40
Capillary 0.05 mm id 0.5 0.4 NA
0.10 mm id 1.0 0.8 NA
0.20 mm id 2.0 1.6 0.25
0.25 mm id 2.5 2.0 0.5
0.32 mm id 3.2 2.6 0.75
0.53 mm id 5.3 4.2 1.5

Table 1: Recommended column flow rates

 
Learn how to effectively operate your Agilent GC system: 
GC-0GEN-1071e - An Overview of the Agilent J&W Column Portfolio e-learning course available from Agilent education
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