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Site Preparation
Gas considerations
10
Gas considerations
Gases for packed columns
The choice of carrier gas depends on the detector selected and what
performance is required from it. These relationships are shown below. In
general, makeup gases are not needed with packed columns.
Detector
Carrier Gas
Comments
Thermal
conductivity
(TCD)
Flame
ionization
(FID)
Nitrogen/
Phosphorus
(NPD)
Electron
capture
(ECD)
General use.
Maximum sensitivity (see Note A).
Hydrogen detection (see Note B).
Maximum hydrogen sensitivity (see Note B).
Maximum sensitivity.
Acceptable alternate.
Optimum performance.
Acceptable alternate.
Maximum sensitivity.
Maximum dynamic range.
Helium
Hydrogen
Nitrogen
Argon
Nitrogen
Helium
Helium
Nitrogen
Nitrogen
Argon/Methane
Note A: Slightly greater sensitivity than helium, but may remove passivation from fila-
ments causing high drift rates until passivation is completely reduced. Incompatible
with some compounds.
Note B: For analysis of hydrogen or helium; greatly reduces sensitivity for other com-
pounds (some peaks may invert).
Gas Recommendations for Packed Columns
Summary of Contents for HP 5890 II Plus Series
Page 1: ...Chemical Analysis Group 5890 Gas Chromatograph 5890 Series II Site Prep Info Document A15282 ...
Page 2: ...Site Prep Installation Manual HP 5890 Series II and HP 5890 Series II Plus ...
Page 6: ...1 Site Preparation ...
Page 19: ...This page intentionally left blank ...
Page 20: ...2 Installation ...