Agilent Technologies 6890 Series Service Manual page 468

Gases 520
Gas requirements
* When using hydrogen with a thermal conductivity detector, vent the detector exhaust to a fume hood
or a dedicated exhaust to avoid buildup of hydrogen gas.
**Helium is not recommended as a makeup gas at flow rate> 5 mL/min Flow rates above 5 mL/min
shorten detector life.
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Site Preparation
Jun 2001
Agilent 6890 Gas Chromatograph Service Manual