Introduction to Headspace and to the 7694 Headspace Sampler
Principles of Operation
18
Figure 7. Injection. S1 and S2 are closed.
End of Cycle and Vial Recovery
The sample vial is lowered back into the carousel. For models with a vial tray,
the carousel rotates and the robotic arm returns the vial to the tray. The vent
valve opens to purge the vent line. The sampler returns to the standby
configuration.
Carrier
gas flow
Auxiliary gas
flow for vial
pressurization
Mass flow
controller
Pressure
regulator
Pressure
transducer
Pressure
transducer
Vent
S1
S2
1
2
3
4
5
6
Flow
restrictor
Sample
loop
To GC
Headspace
vial
Needle
Open
Closed
Carrier gas
Auxiliary gas
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