Inlets 3
Advanced Operation Manual 133
During sampling Pressure upsets caused by switching valves
and trap restrictions in the external sampling device can
cause fluctuations in column flow rates. To compensate for
this, the interface is flow controlled during sampling time.
The sampling flow rate is calculated from the pressure
setpoint that is active when sample introduction begins. This
flow control starts when the GC goes into the Pre Run state
(when your system is automated and the Pre Run light is on
or during manual operation when you press [Prep Run]) and
ends after the interface’s Sampling end setpoint expires.
Sampling end is required for purge and trap or thermal
desorption systems and should be set ≥ the sampler desorb
time.
Valve
Frit
Frit
Frit
Valve
EPC Module
Valve
Split Vent Trap
Gas Sampling Valve
Headspace
Purge and Trap
FS = Flow Sensor
PS = Pressure Sensor
Column
FS
PS
PS
Split
Carrier Supply
80 PSI
Septum Purge
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