About Gas Saver - Agilent Technologies 7890 Series Advanced Operation Manual

3
Inlets

About Gas Saver

Split mode
Split vent flow
mL/min
Splitless mode
Split vent flow
mL/min
38
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].
[Start]
Regular flow
50
[Prep Run]
40
30
20
Gas saver flow
10
-2 -1 0
[Start]
50 Purge time, 2 min
[Prep Run]
40
30
20 Gas saver flow
10
-2 -1 0
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
Gas saver time, 3 min
Gas saver flow
1 2 3 4 5
Time, min
Gas saver time, 5 min
Purge flow
1 2 3 4 5
Time, min
"PTV inlet solvent vent
Run ends
6 7 8
Run ends
Gas saver flow
6 7 8
mode".
Advanced Operation Manual