Cryogenic Cooling Requirements; Using Carbon Dioxide - Agilent Technologies ALS Handbuch

7890 Series GC Site Preparation

Cryogenic Cooling Requirements

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
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
cooling on a multimode inlet, with either the CO
hardware.)
Oven cryogenic cooling is not compatible with the 7000 Triple Quad MS or
7200/7250 Q-TOF MS. If your application requires GC oven cryogenic cooling,
contact your Agilent sales representative.

Using carbon dioxide

Pressurized liquid CO
WA R N I N G
personnel from high pressures and low temperatures. CO
toxic to humans; take precautions to prevent hazardous concentrations. Consult
your local supplier for recommended safety precautions and delivery system design.
Liquid CO
C A U T I O N
because the expanding liquid may form solid CO
builds up in the oven, it can seriously damage the GC.
Liquid CO
should be free of particulate material, oil, and other contaminants. These
contaminants could clog the expansion orifice or affect the proper operation
of the GC.
52
) or liquid nitrogen (N
2
and N coolants require different hardware on the GC. (You can use air
2 2
is a hazardous material. Take precautions to protect
2
should not be used as a coolant for oven temperatures below –40 °C
2
is available in high-pressure tanks containing liquid. The CO
2
) as a coolant. All inlets except the multimode inlet
2
—dry ice—in the GC oven. If dry ice
2
GC, GC/MS, and ALS Site Preparation Guide
or N solenoid valves and
2 2
in high concentrations is
2
2