Configuration 10
Operation Manual 149
To configure the MMI coolant
Press [Config][Front Inlet] or [Config][Back Inlet]. If the inlet has
not been configured previously, a list of available coolants is
displayed. Scroll to the desired coolant and press [Enter].
Cryo type/Cooling type [Mode/Type] displays a list of available
coolants. Scroll to the desired coolant and press [Enter].
Normally, select the coolant type that matches the installed
hardware.
• N2 cryo Select if the N
2
option is installed and you are
using LN
2
or compressed air.
• CO2 cryo Select if the CO
2
option is installed and you
are using LCO
2
or compressed air.
• Compressed air Select if the N
2
or CO
2
option is installed
and you are only using compressed air. If Compressed air is
selected as the Cooling type, air coolant is used to cool
the inlet regardless of the Use cryo temperature setpoint
during the cooling cycle. If the inlet reaches setpoint, the
air coolant is turned off and stays off for the duration of
the cooling cycle. See the Advanced Operation manual for
details.
If the Cryo type selection is anything other than None,
several other parameters appear.
Cryo [On/Yes] enables cryogenic cooling of the inlet at the
specified Use cryo temperature setpoint, [Off/No] disables
cooling.
Use cryo temperature If N2 cryo or CO2 cryo is selected as the
Cryo type, this setpoint determines the temperature below
which cryogenic cooling is used continuously to hold the
inlet at setpoint. Set the Use cryo temperature equal to or
higher than the inlet setpoint to cool the inlet and hold the
setpoint until the inlet temperature program exceeds the Use
cryo temperature. If the Use cryo temperature is less than the
inlet setpoint, cryogen will cool the inlet to the initial
setpoint and turn off.
Cryo timeout This parameter is available with N2 cryo and
CO2 cryo Cryo types. Use this setting to conserve cryogenic
fluid. If selected, the instrument shuts down the inlet and
cryogenic cooling when no run starts in the number of
minutes specified. The setpoint range is 2 to 120 minutes
(default 30 minutes). Turning cryo timeout off disables this
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