12 Injection Port
12.6 Direct Injection System
143
GC-2010 Plus
12.6.2 Setting the flow rate
12.6.2.1 Screen description
Press the [FLOW] key to display the main Flow Screen shown in Fig. 12.6.3. Set the
AFC parameters to control the carrier gas pressure and the flow rate.
12.6.2.2 Parameter list
INLET PRESS
Range: 0.0−970.0 kPa (Refer to Fig. 3.5.1.), Default: 100.0 kPa
Set the column inlet pressure.
When creating a pressure program, this specifies the initial pressure.
When the control mode is set to “PRESS”, the system controls the column inlet
pressure so that it remains constant during a temperature program.
Normally, when using a wide bore column, set the column inlet pressure to a low
pressure (20−40 kPa).
In the case of direct injection, set the inlet pressure so that the column flow rate (= total
flow rate - septum purge flow rate) is at least approximately 10 ml/min.
When the control mode is set to “FLOW,” the parameters are displayed but cannot be
specified.
COLUMN FLOW RATE
Default:
1
1.00 ml/min
Set the carrier gas flow rate at the capillary column exit (atmospheric pressure at 25 °C).
When you set the carrier gas flow rate, the system calculates the column inlet pressure
based on the inner diameter, the length and the film thickness of the column. The col-
umn flow rate is set separately so that the carrier gas flow rate desired occurs at the ini-
tial temperature in the oven temperature program.
When the control mode is set to a selection other than “FLOW,” the parameters are
displayed but cannot be specified.
Fig. 12.6.3 [FLOW] key main screen
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