64 Advanced Operation Manual
3 Inlets
MMI splitless and pulsed splitless modes
In these modes—with or without a pressure pulse—the split
vent valve is closed during injection and vaporization of the
sample and stays so while the sample transfers to the
column.
At a specified time after injection, the valve opens to sweep
vapors left in the liner out the split vent. This avoids solvent
tailing due to the large inlet volume and small column flow
rate.
Stage 1. Sample injection
With the split vent valve closed, the sample and solvent
transfer to the column.
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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