User guide

170 Advanced User Guide
8 Inlets
About Gas Saver
Gas saver reduces carrier flow from the split vent after the
sample is on the column. It applies to the Split/Splitless and
PTV inlets (all modes) and to the split and splitless modes of the
Volatiles Interface. It is most useful in split applications.
Column head pressure and flow rate are maintained, while
purge and split vent flows decrease. Flows—except column
flow—remain at the reduced level until you press [Prep Run].
The pulsed modes of the split/splitless and PTV inlets are
similar except for the pressure pulse starting at [Prep Run] and
ending at Pulse time. The solvent vent mode of the PTV is more
complex; see “PTV inlet solvent vent mode” on page 239.
To use gas saver
1 Press [Front Inlet] or [Back Inlet].
2 Turn gas saver On.
3 Set Gas saver flow. It must be at least 15 mL/min greater than
the column flow.
4 If in split mode, set Saver time after injection time. In all
other modes, set after Purge time.
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Split mode
Splitless mode
Split vent flow
mL/min
Split vent flow
mL/min
Time, min
Time, min
Gas saver flow
Gas saver flow
Gas saver flow
Gas saver flow
Purge flow
Regular flow
[Prep Run]
[Prep Run]
[Start]
[Start]
Gas saver time, 3 min
Gas saver time, 5 min
Run ends
Run ends
Purge time, 2 min