Introduction to Headspace and to the 7694 Headspace Sampler
Modes of Operation
22
Multiple headspace extraction is not allowed if Parameter Increment
(Advanced Function 2) is on.
The following events take place during multiple headspace extraction with
multiple vial puncture:
1. Multiple extraction method loaded
2. Vial placed in oven
3. Vial heated for vial equilibration time
4. Vial sampled according to event times
5. GC started
6. Vial returned to slot in oven carousel
7. Second heating time started (time = GC cycle time)
8. Vial sampled according to event times
9. GC started
10. Vial returned to oven
11. Continue from Step 7 (up to number of extractions per vial)
12. Vial returned to tray
Multiple Vial Puncture with Constant Heating Time–G1289/G1290 only
To perform multiple headspace extraction with multiple vial puncture where
the heating time for each extraction equals the vial equilibration time, you must
chain together identical methods. The number of methods equals the
extractions per vial desired (maximum four). The same vial sequence is
assigned to each method. A given vial is placed in the oven, sampled, then
removed from the oven and placed in the sample tray. It is returned to the oven
for the next extraction. Usually, four extractions per vial are adequate to allow
you to obtain a good log(area) versus extraction number graph for quantitative
work.
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