Agilent Technologies 6850 Series - Connect the cryogenic coolant supply

Oven
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 236
Connect the cryogenic coolant supply
WARNING
Pressurized liquid CO
2
is a hazardous mate-
rial. Take precautions to protect personnel
from high pressures and low temperatures.
CO
2
in high concentrations is toxic to
humans; take precautions to prevent hazard-
ous concentrations. Consult your local
supplier for recommended safety precautions
and delivery system design.
WARNING
Do not use copper tubing or thin-wall stain-
less steel tubing with liquid CO
2
. Both
harden at stress points and may explode.
Caution
Liquid CO
2
should not be used as a coolant
for temperatures below –40°C because the
expanding liquid may form solid CO
2
—dry
ice—in the GC oven. If dry ice builds up in the
oven, it can seriously damage the GC.
Caution
Do not install a pressure regulator on the
CO
2
tank, as vaporization and cooling would
occur in the regulator instead of the oven.