Introduction to Headspace and to the 7694 Headspace Sampler
Modes of Operation
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1. The run/method is started.
2. If agitation (shaking) is set, the carousel will shake for the entered amount
of minutes.
3. The vial is lifted into the heated zone.
4. The vial is heated for the preset time.
5. A headspace injection is made.
6. The vial is returned to the carousel.
Sequence of events–G1289/G1290
When a vial uses a different method from the preceding vial, maximum
throughput may be effected. Runs for all vials using a particular method must
be completed and the vials removed from the carousel before the new method
is loaded.
The following events take place during standard headspace extraction:
1. Method loaded
2. Vial placed in oven
3. Vial heated for vial equilibration time
4. Vial sampled
5. GC started
6. Vial returned to tray
Multiple Headspace Extraction with Multiple Vial Puncture–
G1289/G1290 only
In multiple headspace extraction mode, up to 10 extractions can be made per
vial. With multiple vial puncture, the needle is removed from the vial and the
vial is returned to its original position in the oven after an extraction. For the
first extraction, the vial is heated for the programmed vial equilibration time.
For each successive extraction, the vial is heated for the GC cycle time. The GC
is started after each sampling. Vial agitation is allowed during this mode.
Sample throughput is optimized during this mode.
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