Installing the GC 1
Agilent 7890B Installation 37
Step 7. Connect cryogenic cooling (if present)
Cryogenic cooling allows you to cool the oven or inlet, including
cooling to setpoints below ambient temperature. A solenoid
valve controls the flow of coolant to the inlet or oven. The oven
can use either liquid carbon dioxide (CO
2
) or liquid nitrogen
(N
2
) as a coolant. All inlets except the multimode inlet must use
the same coolant type as the oven. The multimode inlet can use
a different coolant than configured for the oven, and can also
use compressed air as a coolant.
CO
2
and N
2
coolants require different hardware on the GC. (You
can use air cooling on a multimode inlet, with either the CO
2
or
N
2
solenoid valves and hardware.)
Flared or AN tubing fittings are commonly used to connect the
liquid supply tubing to the cryo coolant tank. Check with the
supplier of the coolant before plumbing to be sure you have the
correct fittings.
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