User guide

Inlets 8
Advanced User Guide 271
8
Restore the GC to normal operating conditions. Perform a
leak test on the interface fittings.
Configuring for direct mode
The GC cannot sense the presence of the split vent. When you
disconnect or reconnect the vent, you must configure the GC so
that the pneumatics work properly.
1 Press [Config][Back Inlet] or [Config][Front Inlet].
2 Scroll to Mode and press [Mode/Type].
3 Select Split vent removed. Press [Enter].
4 Press [Back Inlet] or [Front Inlet]. If the inlet is correctly
configured, you will see the Direct injection display.
VI direct mode setpoint dependencies
Some setpoints in the flow system are interdependent. If you
change one setpoint, other setpoints may change to compensate.
VI direct mode initial values
Use the information in Table 59 to help you set up the operating
conditions for your interface.
Table 58 Setpoint changes
When you change These setpoints change
Column defined Column not defined
Before and after
sampling
The Column flow*
setpoint is not available.
Pressure Column flow
*
Total flow**
* This setpoint appears in the column parameters
.**This value is actual only
You can change the
pressure setpoint; other
setpoints are not
affected.
Column flow* Pressure
Total flow**
During sampling You cannot change pressure and flow setpoints
during sampling time.