Thermo Scientific FOCUS GC, Инструкция по эксплуатации

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Chapter 5
S/SL Inlet Parameters Split/Splitless Injector (S/SL)
Instruction Manual 111
OPERATING SEQUENCE
Programming the Splitless Mode
In splitless analyses, the splitting line is closed during the sample transfer onto the
column. The time during which the splitting valve remains closed is called the
splitless time. When the sample transfer ends, the split line reopens to purge the
residual solvent out of the vaporization chamber. The septum purge prevents
septum bleed components from entering the column.
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
Splitless
.
3. Scroll to
Temp
and set the appropriate value.
4. Scroll to
Split Flow
and enter the desired value.
5. Scroll to
Splitless Time
and enter the time the inlet valve should be
closed.
6. 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.