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Jun 2001
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Agilent 6890 Gas Chromatograph Service Manual
520 Gases
Gas requirements
Gases for packed columns
The carrier gas you use depends upon the type of detector and the
performance requirements. Table 520-1 lists gas recommendations for
packed column use. In general, makeup gases are not required with packed
columns.
Table 520-1 Gas Recommendations for Packed Columns
Detector Carrier Gas Comments Detector anode purge
or reference gas
Electron Capture Nitrogen Maximum sensitivity Nitrogen
Argon/
Methane
Maximum dynamic range Argon/Methane
Flame Ionization Nitrogen Maximum sensitivity Hydrogen and
air for detector
Helium Acceptable alternative
Flame
Photometric
Hydrogen Hydrogen and air for
detector
Helium
Nitrogen
Argon
Nitrogen-
Phosphorus
Helium Optimum performance Hydrogen and
air for detector
Nitrogen Acceptable alternative
Thermal
Conductivity
Helium General use Reference must be same as
carrier
Hydrogen Maximum sensitivity (Note A)
Nitrogen Hydrogen detection (Note B)
Argon Maximum hydrogen sensitivity
(Note B)
Note A: Slightly greater sensitivity than helium. Incompatible with some compounds.
Note B: For analysis of hydrogen or helium. Greatly reduces sensitivity for other compounds.
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