User guide

232 Advanced User Guide
8 Inlets
6
Calculate the split ratio (split vent flow/column flow). Adjust
as needed
PTV inlet 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.
The figures show the flows with the septum head. Flows with
the septumless head are the same except that the septum purge
flow bypasses the head.
Stage 1. Sample injection
With the split vent valve closed, the sample and solvent transfer
to the column.