User guide

Configuration 2
Advanced User Guide 27
Oven
See “Unconfigured:” on page 26 and “Ignore Ready =” on
page 25.
Maximum temperature Sets an upper limit to the oven
temperature. Used to prevent accidental damage to columns.
The range is 70 to 450 °C.
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.
To configure the oven
1 Press [Config][Oven].
2 Scroll to Maximum temperature. Enter a value and press
[Enter].
3 Scroll to Equilibration time. Enter a value and press [Enter].
4 Scroll to Cryo. Press [On/Yes] or [Off/No]. If On, enter the
setpoints described in “To configure the oven for cryogenic
cooling” on page 28.
5 Scroll to External oven mode. Press [On/Yes] or [Off/No].