42 Operation
5 Sample Vials
To Cap a Sample Vial
The vial must be sealed properly to insure that the
headspace gases do not escape prematurely. For crimp top
vials, use a crimper designed for headspace vials with
20- mm caps to seal the vials. Screw caps and screw top
vials are also available. See “Consumables for Headspace
Analysis”.
1 Before beginning, clean the inside surfaces of the crimper
jaws.
2 If using separate septa and caps, place a septum in a vial
cap with the PTFE side facing the vial. Take care not to
contaminate the septum.
3 Place the cap upside down on a table.
4 Place the sample in the vial. (Most vials should not be
more than 50% full, but some vials can reach 75% full. See
“Filling Sample Vials”.)
5 Place the septum and cap assembly over the vial opening.
6 Lift the vial into the crimper.
7 With slow and steady pressure, squeeze the crimper
handles to seal the vial. (Squeeze the handle until it
reaches the adjustment screw.)
Figure 9 shows proper and improper vial caps.
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