Agilent Technologies 7890 Series User Manual

Inlets 3
Advanced Operation Manual 113
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 PTV temperature Initial 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
Solvent venting ends, analyte transfer begins as inlet heats up.
4At Purge time Flow at split vent Purge flow setpoint
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).
Tabl e 22 The solvent vent process (continued)
Step Parameter Value

Agilent Technologies 7890 Series Specifications

General

Brand	Agilent Technologies
Model	7890 Series
Category	Laboratory Equipment
Language	English