Agilent Technologies 6850 Series Service Information page 269

The Agilent pressure/flow calculator is depicted
below to demonstrate how the GC EPC system
would setup flows and pressures for the method:
Split ratio of 135:1 results in a split vent flow of 396 mL/min
and a total inlet flow of about 400 mL/min (column + septum
purge + split vent flows)
Optimum linear
velocity
Released: April 2004
Inlet pressure required for
optimum liner velocity
6850 Series Gas Chromatograph Service Procedures
The problem will be exaggerated because of the
low inlet pressure required for the method. Refer
to the pneumatic diagram below for illustration
of the flow and pressure characteristics of the
system.
270