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The most frequently used carrier gases are helium and hydrogen, although nitrogen
and argon can be used. Purity is essential for these gases since they sweep the sample
through the column where it is separated into its component parts and then through
the detector for component quantification. Carrier gas purity is also critical to prevent
degradation of chromatographic columns and hardware.
The following tables list minimum and maximum pressures in psi for inlets and detectors
measured at the bulkhead fitting at the back of the gas chromatograph.
Conversions: 1 psi = 6.8947, kPa = 0.068947, Bar = 0.068 A
TM
Inlet Pressure Settings (psi)
Split/Splitless
(0-150 psi)
Split/Splitless
(0-100 psi)
Cool On-Column Packed PTV
Carrier max
(psi)
170 120 120 120 120
Carrier min
(psi)
Must supply 20 psi greater than pressure used in method
Detector Pressure Settings (psi)
FID NPD TCD ECD FPD
Hydrogen 35-100 35-100 45-100
Air 55-100 55-100 100-120
Make up 55-100 55-100 55-100 55-100 55-100
Reference 55-100
Gas Types
Carrier Gases
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