Split/Splitless Inlet Split Mode Overview - Agilent Technologies 7890 Series Advanced Operation Manual

3
Inlets
To determine the version that you have, press [Front Inlet] or
[Back Inlet], scroll to the Pressure line, and press the [Info]
key. The display will show the pressure range for the
inlet—either 1 to 100 psi (for the standard version) or 1 to 150
psi (for the high- pressure version).

Split/Splitless inlet split mode overview

During a split injection, a liquid sample is introduced into a
hot inlet where it vaporizes rapidly. A small amount of the
vapor enters the column while the major portion exits from
the split/purge vent. The ratio of column flow to split vent
flow is controlled by the user. Split injections are primarily
used for high concentration samples when you can afford to
lose most of the sample out the split/purge vent. It is also
used for samples that cannot be diluted.
The split ratio is equal to the split vent flow divided by the
column flow. If the column has been configured, the desired
split ratio can be entered directly.
The pneumatics for this inlet in split mode operation are
shown in the figure below.
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