1 Installing the GC
Installation and First Startup 51
Figure 14. N
2
cryogenic cooling valve connections
3 Connect the supply tubing to the liquid N
2
tank outlet with the fitting recommended by the
supplier.
4 Use a Swagelok fitting to connect the supply tubing to the cryogenic valve inlet.
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.
A noise reduction kit, G3510-67001, is available for users of compressed air cooling with a
multimode inlet.
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
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