User guide

Configuration 2
Advanced User Guide 29
Front Inlet/Back Inlet
See “Unconfigured:” on page 26 and “Ignore Ready =” on
page 25.
To configure the Gas type
The GC needs to know what carrier gas is being used.
1 Press [Config][Front Inlet] or [Config][Back Inlet].
2 Scroll to Gas type and press [Mode/Type].
3 Scroll to the gas you will use. Press [Enter].
This completes carrier gas configuration.
To configure the PTV or COC 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]. If oven
cooling is installed, your choices are restricted to the coolant
used by the oven or None.
Cryo type [Mode/Type] displays a list of available coolants.
Scroll to the desired coolant and press [Enter].
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 This setpoint determines the temperature
at which cryogenic cooling is used continuously. The inlet uses
cryogen to achieve the initial setpoint. If the initial setpoint is
below the Use cryo temperature, cryogen is used continuously to
achieve and maintain the setpoint. Once the inlet temperature
program starts, the cryogen will be turned off when the inlet
exceeds the Use cryo temperature. If the initial setpoint is above
the Use cryo temperature, cryogen is used to cool the inlet until it
reaches the setpoint and then it is turned off. At the end of a
run, the inlet waits until the oven becomes ready before it uses
cryogen.
If the inlet is to be cooled during a run, cryogen will be used to
achieve the setpoint. This may have a negative impact on the
chromatographic performance of the oven and cause distorted
peaks.