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Site Prep Summary

Summary of GC benchtop and lab requirements

Released: March 2004 6850 Series II GC User Information page 255 of 256

Table 42. Gas Recommendations for Capillary Columns

Detector Carrier gas

Preferred makeup

gas

Second choice/

comments

Detector, anode purge, or

reference gas

Microcell elec-

tron capture

Hydrogen Argon/Methane Nitrogen Anode purge must be the same

as makeup

Helium Argon/Methane Nitrogen

Nitrogen Nitrogen Argon/Methane

Argon/

Methane

Argon/Methane Nitrogen

Flame ionization Hydrogen Nitrogen Helium Must use hydrogen and air as

detector gases

Flame photo-

metric

Hydrogen Nitrogen Hydrogen and air for detector

Helium Nitrogen

Nitrogen Nitrogen

Argon Nitrogen

Thermal

conductivity

Hydrogen Must be same as

carrier and

reference gas

Must be same as

carrier and

reference gas

Reference gas must be

same as carrier and

makeup

Helium

Nitrogen

Table 43. Gas Recommendations for Packed Columns

Detector Carrier gas Comments about carrier gas Detector, or reference gas

Microcell electron

capture

Nitrogen Maximum sensitivity Nitrogen

Argon/

Methane

Maximum dynamic range Argon/Methane

Flame ionization Nitrogen Maximum sensitivity Nitrogen

Helium maximum dynamic range

Flame photometric Hydrogen Hydrogen and air for detector

Helium

Nitrogen

Argon

Thermal conductivity Helium General use

Reference gas must be

same as carrier gas

Hydrogen

Maximum sensitivity

Nitrogen

Hydrogen detection

Argon

Maximum hydrogen sensitivity

Slightly greater sensitivity then helium. Incompatible with some compounds.

For analysis of hydrogen or helium. Greatly reduces sensitivity for other compounds.

Brand	Agilent Technologies
Model	6850 Series II
Category	Laboratory Equipment
Language	English

Agilent Technologies 6850 Series II User Manual

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Agilent Technologies 6850 Series II Specifications

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