Mmi Splitless And Pulsed Splitless Modes - Agilent Technologies 7890 Series Advanced Operation Manual

3
Inlets

MMI splitless and pulsed splitless modes

Valve
Split Vent Trap
FS = Flow Sensor
PS = Pressure Sensor
64
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.
Carrier Supply
80 PSI
Frit
Valve
FS
Column
EPC Module
Valve
PS
PS
Inlet Weldment
Septum Purge
Frit
Advanced Operation Manual