Inlets 3
Advanced User Guide 35
Septum Purge Flow, in mL/min, through the septum purge line.
If all columns in the flow path are defined
1 Press [Front Inlet] or [Back Inlet].
2 Scroll to Mode: and press [Mode/Type]. Select Split.
3 Set the inlet temperature.
4 If you want a specific split ratio, scroll to Split ratio and enter
that number. Split flow will be calculated for you.
5 If you want a specific split flow, scroll to Split flow and enter
that number. Split ratio will be calculated for you.
6 If desired, turn on Gas saver. Set Saver time after the injection
time. Press [Prep Run] (see “Pre Run and Prep Run” on
page 25) before manually injecting the sample.
If a column in the flow path is not defined
1 Press [Front Inlet] or [Back Inlet].
2 Set the inlet temperature.
3 Set Total flow into the inlet. Measure the split vent flow using
a flow meter.
4 Subtract split vent flow and septum purge flow (see “Pre
Run and Prep Run” on page 25) from Total flow to get column
flow.
5 Calculate the split ratio (split vent flow/column flow). Adjust
as needed.
NOTE
The following two steps are not applicable to EPR equipped GCs with an
S/SL inlet. If you want to calculate the split ratio, adjust the total flow (by
using the 2/+ and 8/- buttons on the software keypad, and then adjust
the column head pressure until the desired split ratio is achieved.
NOTE
Gas saver is not supported on EPR (electronic pneumatics regulation)
equipped GCs.
NOTE
The following step is not supported on EPR (electronic pneumatics
regulation) equipped GCs since the split ratio cannot be set.
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