Columns and Oven 4
Advanced Operation Manual 161
To set up a post run backflush
A main advantage of the post- run backflush method is that
the GC turns off detection during this time. If using an MSD,
this helps prevent damage to the detector and is the
recommended backflush method.
If using an Agilent data system, a Backflush Wizard provides
a straightforward interface for making these settings.
1 Verify that all columns are properly configured.
2 Since the backflush will run as a post- run program, set
the method so that the oven program ends after the last
peak of interest returns to baseline, or after reaching the
last temperature of interest.
3 Press [Post Run] and enter the backflush duration as the
Time.
• The oven temperature and column pressure/flow
setpoints for installed columns appear.
• Whether you can enter a pressure or flow for a column
depends on its mode (pressure or flow).
• Some inlets, such as the multimode inlet, also provide
a post run inlet temperature and total flow rate.
4 Enter the oven temperature for the backflush.
5 Enter the backflush flow(s) or pressure(s).
If in flow mode:
• Enter a negative flow for the column connected
between the inlet and the CFT device. The GC will
automatically establish the corresponding pressures
needed in the inlet and the CFT device.
• Increase the flow rates in the column(s) connected
between the CFT device and the detector(s).
If in pressure mode:
• Set the pressure of the column connected between the
inlet and the CFT device to 0.000. This turns off flow
from the inlet.
• Increase the pressure of the primary column connected
between the CFT device and the detector(s). This
creates the backward flow through the column and
increases the flow through any connected detectors.
6 If using a multimode inlet, enter a total flow and inlet
temperature for the post run (backflush) period.
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