Gas Selection - Agilent Technologies ALS Handbuch

Gas Selection

Table 36
with capillary columns, GC detectors require a separate makeup gas for
optimum sensitivity. The MSD uses GC carrier gas.
If using any MS system, use of hydrogen as the carrier gas may require
hardware modifications for best performance. Contact your Agilent service
representative.
Nitrogen and Argon/Methane are generally not suitable for GC/MS carrier gas.
N O T E
Table 36 Gases usable with Agilent GCs and capillary columns
Detector type
Electron capture (ECD)
Flame ionization (FID)
Flame photometric (FPD)
Thermal conductivity
(TCD)
Table 37
makeup gases are not required with packed columns.
GC, GC/MS, and ALS Site Preparation Guide
lists gases usable with Agilent GCs and capillary columns. When used
Carrier Preferred makeup
Hydrogen Nitrogen
Helium
Nitrogen
Argon/Methane (5%)
Hydrogen Nitrogen
Helium Nitrogen
Nitrogen Nitrogen
Hydrogen Nitrogen
Helium Nitrogen
Nitrogen Nitrogen
Argon Nitrogen
Hydrogen Must be same as
Helium carrier and reference
Nitrogen
lists gas recommendations for packed column use. In general,
6850 Series GC Site Preparation
Alternate choice Detector, anode
purge, or reference
Nitrogen Anode purge must
Nitrogen be same as makeup
Argon/Methane (5%)
Nitrogen
Helium Hydrogen and air for
Helium detector
Helium
Hydrogen and air for
detector
Must be same as Reference must be
carrier and reference same as carrier and
makeup
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