12 Injection Port
12.5 Split/Splitless Injection System
126
GC-2010 Plus
The linear velocity is set separately so that the linear velocity desired occures at the ini-
tial temperature in the oven temperature program.
When the control mode is set to “VELOCITY”, the column inlet pressure automatically
changes so that the linear velocity remains constant even while the oven temperature
program is running.
SPLIT RATIO
Range: -1.0/0.0−9999.9, Default: -1.0
The split ratio is “split flow rate / column flow rate.”
When you set a split ratio, the system sets the total flow rate based on the calculated
carrier gas flow rate and split flow rate, so that the desired split ratio occurs at the oven
temperature.
Set the split ratio to “-1.0” to fix the total flow rate regardless of the oven temperature.
TOTAL FLOW RATE
Range: 0.0−1200.0 ml/min (Refer to Fig. 3.5.1.), Default: 500.0 ml/min
In split or splitless mode, the total flow rate is equivalent to “column flow rate + split flow
rate + septum purge flow rate”.
SPLIT MODE
Selection: SPLIT/SPLITLESS/DIRECT, Default: SPLIT
SPLIT: Controls the column inlet pressure and the total flow rate so that the column inlet
pressure and split ratio occur as specified.
SPLITLESS: Closes the split flow line during the sampling time so that the set column inlet
pressure is controlled by the Total Flow Controller.
Opens the split flow line and controls the Electronid Split Controller so that the
preset column inlet pressure occurs (Refer to Fig. 12.5.2.) after the sampling
time elapses.
To set the time of the Splitless auto off, refer to “16.6.11 Other Settings” in
“16.6 GC Configuration”.
DIRECT: Closes the split flow line and the set column inlet pressure and linear velocity (in
pressure mode) or the set total flow rate (in flow rate mode) occurs. When making
direct injection analyses, select WBI or OCI in the setup screen so that SPLIT
mode is not available.
SAMPLING TIME
Range: 0.00−9999.99 min, Default: 1.00 min
Sets the sampling time for splitless analysis.
The sampling time indicates the period of time after analysis starts until the split flow line
is opened.
NOTE When setting the sampling time, ensure that the program time is longer than the sampling time.
Otherwise, the sampling time connot function correctly.
CONTROL MODE
Selection: PRESS/VELOCITY/FLOW (for direct injection mode), Default: PRESS
When the injection mode is set to “SPLIT” or “SPLITLESS”
PRESS: Controls the system so that the column inlet pressure remains constant.
VELOCITY: Controls the system so that the linear velocity remains constant.
When the injection mode is set to “DIRECT”
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 flow rate remains constant.
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