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

3
Inlets

PTV inlet splitless and pulsed splitless modes

102
Subtract the septum purge flow and split vent flow from
5
Total flow to get column flow.
6 Calculate the split ratio (split vent flow/column flow).
Adjust as needed
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.
Advanced Operation Manual