72 Advanced Operation Manual
3 Inlets
Stage 2. Sample transfer
When solvent venting ends, the split valve vent closes and
the inlet heats to Final temperature 1. The sample transfers to
the capillary column during Purge time. (Purge flow to split vent
in a data system).
Stage 3. Purge and cleanup
The split valve opens again and the system returns to the
Stage 1 configuration but with different setpoints. The MMI
is flushed. Additional ramp rates are available to thermally
clean the inlet or to reduce inlet temperature after sample
transfer. This can extend the life of the liner.
Temperature, pressure, and flow considerations
The solvent vent mode goes through three distinct pneumatic
states; venting, sample transfer, and purging. The vent
portion allows the inlet pressure and the vent flow to be
adjusted to optimize solvent elimination. The transfer state
Valve
Frit Frit
Valve
EPC Module
Valve
Split Vent Trap
Inlet Weldment
FS = Flow Sensor
PS = Pressure Sensor
FS
PS
PS
Carrier Supply
80 PSI
Septum Purge
Column
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