12 Injection Port
12.3 Direct Injection System
147
GC-2014
12.3.2 Setting the flow rate
12.3.2.1 Screen description
Press the [FLOW] key to display the main Flow Screen shown in Fig. 12.3.3. Set the
AFC parameters to control the carrier gas pressure and the flow rate.
12.3.2.2 Parameter list
INLET PRESS
Range: 0.0−970.0 kPa, 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).
COLUMN FLOW RATE
Default:(Refer to NOTE 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.
LINEAR VELOCITY
Default:(Refer to NOTE 2) 30.0 cm/s
Set the average linear velocity of the carrier gas flowing in the capillary column.
Fig. 12.3.3 [FLOW] key main screen
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