Installing the GC 1
Agilent 7890B Installation 41
Connecting air to the multimode inlet
The multimode inlet can also use compressed air cooling with
the liquid N
2
inlet cooling option. Requirements for compressed
air cooling:
• The compressed air should be free of particulate material,
oil, and other contaminants. These contaminants could clog
the inlet's cryo valve and expansion orifice or impact the
proper operation of the GC.
• The required air supply pressure depends on the installed
solenoid valve type. For a multimode inlet with N
2
cooling,
set the air supply pressure to 138 to 276 kPa (20 and
40 psig).
While air supplied from tanks can meet these criteria, the
consumption rate of air can be 80 L/min, varying based on
supply pressure.
Materials needed:
Installation of a compressed air line to the inlet cryo coolant
valve requires the hardware (and appropriate fittings) noted
below:
• Use 1/4-inch copper or stainless steel tubing for supply
tubing to the N
2
valve
1 Locate the input fitting for inlet coolant on the left-hand side
of the GC. Prepare enough tubing to reach from the supply to
this outlet.
2 Connect the supply tubing to the air supply outlet with the
fitting recommended by the supplier.
3 Use a Swagelok fitting to connect the supply tubing to the
cryogenic valve input fitting.
A noise reduction kit, G3510-67001, is available for users of compressed
air cooling with a multimode inlet.
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