User guide

246 Advanced User Guide
8 Inlets
Vent flow The flow of carrier gas out the split vent during the
vent period. Higher flows sweep the liner more quickly and
reduce the time for solvent elimination. For most columns,
100 mL/min vent flow eliminates solvent at an acceptable rate
but puts minimal material on the column.
Vent end time The time, measured from Start Run, when
solvent venting ends. For large volume injections, this time is
normally greater than the time for the injection to complete.
Purge time The time, measured from Start Run, when sample
transfer ends. It began at Vent end time.
Purge flow The flow of carrier gas to the inlet beginning at
Purge time.
Total f l ow The actual flow into the inlet.
Septum Purge Flow through the septum purge vent
Gas saver On to reduce split vent flow at Saver time
Saver flow Reduced split vent flow, at least 15 mL/min
Saver time Time when flow is reduced to save gas
If the column is defined
1 Press [Front Inlet].
2 Scroll to Mode: and press [Mode/Type]. Select Solvent vent.
3 Enter a Vent pressure, a Vent flow, and a Vent end time.
4 Set the inlet temperature and ramps, as desired.
5 Enter a Purge time and a Purge flow.
6 If desired, turn Gas saver on. Make certain the time is set
after the Purge time.
7 Press [Prep Run] (see “Pre Run and Prep Run” on page 171)
before manually injecting a sample.
1000 12.7 88
Table 45 Minimum attainable pressures
Vent flow (mL/min) Actual vent pressure at
“0“ psig setpoint
Actual vent pressure at
“0” kPa setpoint