144 Operation Manual
10 Configuration
Oven
See “Unconfigured:” on page 143 and “Ignore Ready =” on
page 142.
Maximum temperature Sets an upper limit to the oven
temperature. Used to prevent accidental damage to columns.
The range is 70 to 450 °C. See the column manufacturer’s
recommendations.
Equilibration time The time after the oven approaches its
setpoint before the oven is declared Ready. The range is 0 to
999.99 minutes. Used to ensure that the oven contents have
stabilized before starting another run.
Cryo These setpoints control liquid carbon dioxide (CO
2
or
liquid nitrogen (N
2
) cooling of the oven.
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.
External oven mode Isothermal internal oven and
programmed external oven used to calculate column flow.
Slow oven cool down mode On reduces the oven fan speed
during the cool down cycle.
Limit ballistic power Reduce oven power when heating at
maximum rate to limit the current drawn from the power
line.
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