38 Agilent 7890B Installation
1 Installing the GC
Connecting liquid carbon dioxide
Materials needed:
• 1/8-inch heavy-wall, stainless steel tubing
1 Locate the inlet for liquid CO
2
on the left side of the GC.
Prepare enough tubing to reach from the supply tank to this
fitting. See Figure 13.
Figure 13 Location of cryogenic cooling valve
2 Connect the supply tubing to the liquid CO
2
tank outlet with
the fitting recommended by the supplier.
Do not use copper or thin-wall stainless steel tubing! Either
presents an explosion hazard.
Do not use padded tanks for CO
2
supplies. The cryogenic valve is
not designed to handle the higher pressures padded tanks
generate.
The tank must be equipped with an eductor tube (dip tube) that
reaches to the bottom of the tank, so that liquid (rather than
gaseous) CO
2
is drawn.
Cryogenic cooling
valve fitting
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