126 Advanced Operation Manual
3 Inlets
About the Volatiles Interface
The volatiles interface provides a simple, reliable way to
introduce a gas sample into your GC from an external device
such as a headspace, purge and trap, or air toxic sampler.
Manual syringe injections cannot be made with this
interface. The interface has a small volume and is highly
inert, ensuring high sensitivity and resolution for
applications requiring trace level detection.
The figure shows the pneumatics in the split mode.
Total flow to the interface is measured by a flow sensor and
is divided into two streams. One stream connects to the
septum purge regulator; the other connects to a frit block. At
the frit block, the flow is further divided. The first stream
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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