36 Agilent 7890B Installation
1 Installing the GC
Step 6. Vent µECD or uncombusted hydrogen to a fume hood
If using a uECD, or if using hydrogen carrier gas that will be
uncombusted, you must either safely vent the exhaust or
operate the GC inside a fume hood. For example, if using
hydrogen carrier gas the GC would vent uncombusted hydrogen
from a thermal conductivity detector (TCD) and from the inlet
split vent and septum purge vent.
The uECD exhaust vents through a coiled tube. Connect tubing
from the tube fitting at the end of this tubing to an exhaust hood
via a hole in the back panel.
For a TCD, you must supply vent tubing and fittings to connect
to the detector exhaust tube on the top of the detector. Route
the tubing out the back of the GC, following the same path as for
the uECD vent tubing.
The other detectors (FID and FPD) combust any hydrogen
carrier gas.
Vent line to back
panel
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