48 Advanced Operation Manual
3 Inlets
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.
Split/Splitless inlet split mode minimum operating pressures
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.
Pressure pulse
Pressure or flow program
Pressure
or
Flow
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