12 Injection Port
12.6 Direct Injection System
144
GC-2010 Plus
LINEAR VELOCITY
Default:
2
30.0 cm/s
Set 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, the length and the film thickness of the column. The linear velos-
ity is set separately so that the linear velocity desired occurs at the initial temperature in
the oven temperature program.
When the control mode is set to “FLOW,” the parameters are not displayed.
If you set the control mode to “VELOCITY”, the column inlet pressure automatically changes
so that the linear velocity remains constant during the oven temperature program.
TOTAL FLOW RATE
Range: 0.0−1200.0 ml/min (Refer to Fig. 3.5.1.), Default: 50.0 ml/min
Set the total flow rate, which is the sum of “column flow rate + split flow rate + septum
purge flow rate”.
SPLIT MODE
Set to “DIRECT”. Operations cannot be properly controlled under other settings.
CONTROL MODE
Selection: PRESS/VELOCITY/FLOW, Default: PRESS
PRESS: Controls the system so that the column inlet pressure remains constant.
VELOCITY: Controls the system so that the linear velocity remains constant.
FLOW: Controls the system so that the set flow rate remains constant.
CARRIER GAS TYPE
Selection: He/N2/H2/Ar, Default: He
Specify the carrier gas type supplied to the AFC.
This parameter is used for the measurement/control of the flow rate.
If this parameter is set incorrectly, flow rate calckulations may not be performed
incorrectly.
(Example: If this parameter is set to “N2” when He is actually used, the displayed total
flow rate, column flow rate and linear velocity are lower than the actual values.)
CARRIER GAS PRIMARY PRESSURE
Range: Cannot be set by user. For display only.
A rough pressure level (primary pressure) of the carrier gas supplied to the AFC is
displayed. Note 3)
1 The column flow rate ranges is from 0 to the value at which the calculated column inlet pressure is
970 kPa or less and the calculated total flow rate is 1,200 ml/min or less.
2 The linear velocity ranges is from 0 to the value at which the calculated column inlet pressure is
970 kPa or less.
3 It is normal that primary pressures displayed on the screen for each injection port have approximately
10 kPa variation when two or more injection ports are mounted. (The displayed values are only rough
indications.)
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