Thermo Scientific FOCUS GC, Instruction Manual

Page: 110 / 356

Chapter 5
Split/Splitless Injector (S/SL)
S/SL Inlet Parameters
110 Instruction Manual
OPERATING SEQUENCE
Programming the Split Mode
In split injection, only a portion of the sample transfers to the column. Most of it
discharges through the splitting line. The ratio between the split flow and the
column flow defines the amount of sample that enters the chromatographic
system. The split and column flows must be set to obtain the correct split ratio
necessary for the analysis.
Before you begin programming, do the following:
• Verify that a column is correctly installed, the correct liner is in the injector,
and the system is free of leaks.
• Program the carrier gas flow as described in Chapter 3.
Proceed as follows:
Use
INC
and
DEC
keys to increase or decrease the parameter values.
1. In Main Menu move the cursor until Inlet is selected. Press
ENTER
to display
the
INLET
menu.
2. In the Mode line select
Split
.
3. Scroll to
Temp
and set the appropriate value.
4. Specify the split flow or the split ratio. To set
Split Flow
enter the value in
the relevant line. The split ratio will be calculated for you. To set
Split
Ratio
, enter the value in the relevant line. The split flow will be calculated
for you.
5. If constant septum purge is required, scroll to
Constant Septum Purge
and set On to activate a constant septum purge. If constant septum purge is not
required, set the Constant Septum Purge Off. Scroll to
Stop Purge For:
and enter the time the purge flow should be interrupted.