Thermo Scientific FOCUS GC, Instruction Manual

Page: 121 / 356

Chapter 6
PPKD Injector Menu Purged Packed Column Injector (PPKD)
Instruction Manual 121
OPERATING SEQUENCE
Programming the PPKD Injector Surged Wide bore Mode
In the
Wide bore w/surge
mode, a carrier gas pressure surge activates during
the injection phase for a preset time. This surge accelerates the transfer process of
the substances from the injector to the column. The pressure surge starts in the
Prep Run phase and ends at the end of the programmed
Surge duration
.
Before programming the packed column injector, do the following:
• Verify that a wide-bore column is correctly installed, the correct liner is in the
injector, if used, and the system is free of leaks.
• Check the oven temperature and detector temperature.
• Program the carrier gas flow as described in Chapter 3 Gas Control .
WARNING! Hydrogen is a potentially dangerous gas. Refer to Using Hydrogen for safety
information.
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
Surged W.bore
.
3. Scroll to
Surge pressure
and enter the value of the pressure surge.
4. Scroll to
Surge duration
and enter the duration of the pressure surge.
5. Scroll to
Temp
and enter the appropriate injector temperature.
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.