Introduction to Headspace and to the G1888 Network Headspace Sampler
User Information 39
Loop equilibration
Both pressure and vent valves are closed for the length of time
assigned to this setpoint.
Injecting the sample
The sample valve brings the sample loop in line with the carrier
gas flow. The carrier gas flows through the sample loop and the
transfer line into the GC inlet port. This sweeps the sample into
the GC. See Figure 10.
Figure 10 Injection. S1 and S2 are closed.
Carrier gas flow
Mass
controller
Pressure
transducer
Vent
Sample
loop
To GC
Auxiliary gas flow
for vial pressurization
Pressure
regulator
Pressure
transducer
Flow restrictor
S1
S2
Needle
Headspace vial
Open
Closed
Carrier gas
Auxiliary gas
1
2
3
4
5
6
flow
Toggle
switch
Toggle
switch
medium_standard.book Page 39 Tuesday, February 17, 2004 10:14 AM
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