User guide

Inlets 8
Advanced User Guide 219
About the Packed Column Inlet
This inlet is also known as the purged packed inlet (PP). It is
used with packed columns when high- efficiency separations
are not required. It can also be used with wide- bore capillary
columns, if flows greater than 10 mL/min are acceptable.
If the columns are not defined (packed columns and undefined
capillary columns), the inlet is usually flow- controlled. If
capillary columns are used and the columns in the flow path are
defined, the inlet is normally pressure- controlled but can be
put into the flow control mode.
The figure shows the inlet in the capillary column mode, with
the column defined and the flow controlled by pressure.
Valve
Frit Frit
Valve
EPC Module
Inlet Weldment
FS = Flow Sensor
PS = Pressure Sensor
FS PS
Carrier Supply
80 PSI
Septum Purge
Column
PS