36 User Information
Introduction to Headspace and to the G1888 Network Headspace Sampler
Standby Condition
During standby, the pressurization valve is open. Auxiliary gas
flushes the sample valve, the sample loop, and the sampling
needle. Carrier gas flows to the GC injection port through the
sample valve. See Figure 7.
Figure 7 Standby condition. S1 is open
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
To headspace vial
Open
Closed
Carrier gas
Auxiliary gas
1
2
3
4
5
6
flow
Toggle
switch
Toggle
switch
medium_standard.book Page 36 Tuesday, February 17, 2004 10:14 AM
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