About The Ptv Inlet; Ptv Sampling Heads - Agilent Technologies 7890 Series Advanced Operation Manual

3
Inlets

About the PTV Inlet

PTV sampling heads

96
The Agilent Programmed Temperature Vaporization (PTV)
Inlet System has five operating modes:
• The split mode is generally used for major component
analyses.
• The pulsed split mode is like the split mode, but with a
pressure pulse applied to the inlet during sample
introduction to speed the transfer of material to the
column.
• The splitless mode is used for trace analyses.
• The pulsed splitless mode allows for a pressure pulse
during sample introduction.
• The solvent vent mode is used for large volume injection.
Either single or multiple injections can be made for each
run.
The PTV inlet can be used with both manual and automatic
injection.
For automatic multiple injections (large volume injections),
an Agilent GC or MSD ChemStation is required. This
function is not available under GC control alone. See
inlet solvent vent mode"
Two heads are available for the PTV inlet.
The septum head uses either a regular septum or a Merlin
Microseal™ to seal the syringe passage. A stream of gas
sweeps the inner side of the septum and exits through the
septum purge vent on the pneumatics module. It may be
used with either automatic or manual injection.
The septum head uses either standard 11 mm septa or (with
a different cap) a Merlin Microseal.
The septumless head uses a check valve instead of a septum
to seal the syringe entrance passage. It may be used with
either automatic or manual injection. This head is
recommended for subambient inlet operation.
on page 109.
Advanced Operation Manual
"PTV