User guide

Inlets 8
Advanced User Guide 205
Some important points
• The flow through the column is governed by the pressure in
the inlet. This is controlled, during the analysis part of the
process, by the flow or pressure setpoint or program entered
for the column.
• The controlling times must be in the order shown; Vent end
time before Purge time, and Purge time before Saver time.
• Vent end time must occur before the inlet starts to heat and
release analytes.
• Purge time must occur before the oven begins to heat and
move sample through the column.
Timelines
Time increases downward; all other quantities increase to the
right.
Inlet pressure Column pressure setpoint
Analyte transfer ends, inlet is purged of residual vapor. Analysis begins.
5 At Saver time Flow at split vent Saver flow setpoint
Inlet pressure Column pressure setpoint
Analysis ends, carrier flow reduced to save gas (if Saver is on).
Table 36 The solvent vent process (continued)
Step Parameter Value