How the 7697A Headspace Sampler Works 2
Advanced Operation 23
Figure 9 HS sampler flows, GC carrier mode
Standard extraction
In this mode, the HS performs one extraction and one
injection per vial puncture. After the vial equilibrates, the
HS checks system readiness. If the system is ready, or if the
readiness sequence action is continue, the HS punctures the
vial. The HS pressurizes the vial and extracts the sample
SV1
SV2
PV1
PV2
PS
PS
FS
Flow control module
1
2
3
4
5
6
Six port valve
Transfer line
Vent
Carrier gas
Vial pressurization gas
PS - Pressure sensor
FS - Flow sensor
SV - Switching valve
PV - Proportional valve
Sample loop
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