12 Injection Port
12.5 Split/Splitless Injection System
127
GC-2010 Plus
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 not set correctly, flow rate calculations may not be performed
correctly.
(Example: If this parameter is set to “N
2” 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 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.
2 The linear velocity ranges 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.)
12.5.2.3 PF menu
PF menu Description
Reference
section
Column
Sets inner diameter, length and film thickness of capillary column.
Values set here are used in column inlet pressure caluculations from
column flow rate or linear velocity (or vice versa).
If these parameters are not set correctly, calculations are not performed
correctly.
12.5.3
Gas Saver The gas saver saves carrier gas by reducing the split flow rate. 12.5.4
On/Off
Sets flow controller to be used to “On”.
Default value is “Off”.
When [Start GC] is pressed, the AFC in the current analytical line which is
set to “On” starts.
If AFC is set to “Off” during carrier gas control, the control stops. When it is
set to “On” again, the carrier gas control restarts.
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Press Prog Sets the column inlet pressure program. 12.5.5
Flow Prog Sets the total flow rate program. 12.5.6
Split Prog Sets the split ratio program. 12.5.7
Purge Sets the septum purge flow rate and program for flow rate. 12.5.8
Advanced
High Pressure Injection:
Sets high pressure injection, where the column inlet pressure is kept at a
high value for a certain period of time during injection.
Splitter Fix:
Keeps the split flow rate constant.
Back Flush:
Sets back flush, where the column inlet pressure is kept at a low value
after analysis.
12.5.9
Offset
Performs offset calibration of the AFC sensor.
This calibration contributes to good reproducibility of results.
3.6
Next Flow
Toggles among the AFC set up screens if two or more AFCs are installed
in this system.
The [FLOW] key can also be used to switch screens.
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