Agilent Technologies 6890 Series User Manual

97
The Column Oven
Cryogenic operation
Cryogenic operation
The cryogenic valve lets you operate the oven below ambient temperature.
Minimum attainable oven temperature depends on the type of valve installed.
The GC senses the presence and type of cryogenic valve and disallows setpoints
if no valve is installed. When cryogenic cooling is not needed or cryogenic
coolant is not available, the cryogenic operation should be turned off. If this is
not done, proper oven temperature control may not be possible, particularly at
temperatures near ambient.
For information on installation and coolants see “Cryogenic Cooling
Requirements” in the Agilent 6890 Site Preparation and Installation Manual.
Cryogenic control setpoints
All cryogenic setpoints are in the [Config] [Oven] control table.
Cryo [ON] enables cryogenic cooling, [OFF] disables it.
Quick cryo cool This feature is separate from Cryo. Quick cryo cool
makes the oven cool faster after a run than it would without assistance. This
feature is useful when maximum sample throughput is necessary, however it
does use more coolant. Quick cryo cool turns off soon after the oven reaches
its setpoint and Cryo takes over, if needed.
Ambient temp The temperature in the laboratory. This setpoint determines
the temperature at which cryogenic cooling is enabled:
If your instrument is not equipped
with the cryogenic option, part of
the display will look like this
Cryo setpoints

Agilent Technologies 6890 Series Specifications

General

Brand	Agilent Technologies
Model	6890 Series
Category	Laboratory Equipment
Language	English