Agilent Technologies 6850 Series II User Information page 255

Table 42. Gas Recommendations for Capillary Columns
Detector Carrier gas
Microcell elec- Hydrogen
tron capture
Helium
Nitrogen
Argon/
Methane
Flame ionization Hydrogen
Flame photo- Hydrogen
metric
Helium
Nitrogen
Argon
Thermal Hydrogen
conductivity
Helium
Nitrogen
Table 43. Gas Recommendations for Packed Columns
Detector
Microcell electron
capture
Flame ionization
Flame photometric
Thermal conductivity
1
Slightly greater sensitivity then helium. Incompatible with some compounds.
2
For analysis of hydrogen or helium. Greatly reduces sensitivity for other compounds.
Released: March 2004
Preferred makeup
gas
Argon/Methane
Argon/Methane
Nitrogen
Argon/Methane
Nitrogen
Nitrogen
Nitrogen
Nitrogen
Nitrogen
Must be same as
carrier and
reference gas
Carrier gas Comments about carrier gas
Nitrogen Maximum sensitivity
Argon/ Maximum dynamic range
Methane
Nitrogen Maximum sensitivity
Helium maximum dynamic range
Hydrogen
Helium
Nitrogen
Argon
Helium General use
Hydrogen
Maximum sensitivity
Nitrogen
Hydrogen detection
Argon
Maximum hydrogen sensitivity
6850 Series II GC User Information
Summary of GC benchtop and lab requirements
Second choice/ Detector, anode purge, or
comments reference gas
Nitrogen Anode purge must be the same
as makeup
Nitrogen
Argon/Methane
Nitrogen
Helium Must use hydrogen and air as
detector gases
Hydrogen and air for detector
Must be same as Reference gas must be
carrier and same as carrier and
reference gas makeup
Detector, or reference gas
Nitrogen
Argon/Methane
Nitrogen
Hydrogen and air for detector
1
Reference gas must be
2
same as carrier gas
2
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