Oven
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 237
WARNING
All fittings and tubing should be stainless
steel. The pressure inside a liquid CO
2
tank
can be as high as 1000 psi.
Liquid CO
2
is available in high-pressure tanks
containing 50 pounds of liquid. The tank must
have an internal dip tube or eductor tube to
deliver liquid CO
2
instead of gas. Do not use a
padded tank (one to which another gas is added
to increase the delivery pressure).
1. Connect a CGA 320 to 1/4-inch male NPT
fitting to the tank followed by a Swagelok
part no. SS-200-7-4 1/4-inch female NPT to
1/8-inch tube fitting.
2. Connect the tank to the cryogenic filter inlet
with 1/8-inch diameter heavy-wall stainless
steel tubing. The tubing may be up to 50 feet
long.
Allow some slack in the line to make move-
ment of the tank or GC easier. Coil and
fasten the ends of the tubing to keep it from
“whipping” if it breaks.
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