User guide

Configuration 2

Advanced User Guide 31

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

option is installed and you are using

or compressed air.

• CO2 cryo Select if the CO

option is installed and you are

using LCO

or compressed air.

• Compressed air Select if the N

or CO

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 Cooling the MMI for more information.

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 feature. We recommend

cryo timeout enabling to conserve coolant at the end of a

sequence or if automation fails. A Post Sequence method could

also be used.