12 Injection Port
12.2 Split/Splitless Injection System
129
GC-2014
12.2.2 Setting the flow rate with [FLOW] key
12.2.2.1 Screen description
Press the [FLOW] key to display the screen shown in Fig. 12.2.4 and to set the AFC
(advanced flow controller) parameters. The AFC controls the pressure and the flow rate
of the carrier gas.
12.2.2.2 Parameter list
INLET PRESS
Range: 0.0−970.0 kPa (Refer to NOTE 1), Default: 100 kPa
Set the column inlet pressure.
This sets the initial temperature of a pressure program.
When the control mode is set to “PRESS”, the system controls the column inlet
pressure so that it remains constant during an oven temperature program.
COLUMN FLOW RATE
Range: (Refer to NOTE 2), Default: 1.00 ml/min
Sets the carrier gas flow rate at the capillary column outlet (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 and the length of the column and the film thickness of the
column. The column flow rate is set separately so that the carrier gas flow rate desired
occures at the initial temperature in the oven temperature program.
LINEAR VELOCITY
Range: (Refer to NOTE 3), Default: 30.0 cm/s
Sets the average linear velocity of the carrier gas flowing in the capillary column.
When you set the linear velocity, the system calculates the column inlet pressure based
on the inner diameter and the length of the column and the film thickness of the column.
Fig. 12.2.4 [FLOW] key main screen
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