Split/Splitless Inlet Split Mode Minimum Operating Pressures - Agilent Technologies 7890 Series Advanced Operation Manual

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Inlets
Pressure pulse
Pressure
or
Flow
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Split/Splitless inlet split mode minimum operating pressures

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You can do column pressure and flow programming when in
the pressure pulse mode. However, the pressure pulse will
take precedence over the column pressure or flow ramp.
Pressure or flow program
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The minimum recommended inlet total flow is
20 mL/minute. When the split/splitless inlet is operated in
Split mode, there will be a minimum pressure at which the
inlet can operate. Typically, low inlet pressures may be
required for shorter, wide bore columns. The minimum
pressure is a function of carrier gas type, total inlet flow,
liner design, and possible contamination of the split vent
tube or trap.
A wide bore column requires a much lower inlet pressure
than a typical capillary column to maintain a given flow.
Setting the split ratio (total flow) too high when using a
wide bore column can create an unstable control
relationship between the pressure and flow control loops.
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Advanced Operation Manual