P/N 330654-E 01/2018 COPYRIGHT © Dansensor A/S
34 User Guide EN Lippke 4000/4500
Septa
In order to ensure a linear pressure increase in the package and to avoid unnecessarily high consumption
of air it may be necessary to seal the package’s piercing point with a septum. A septum also protects the
package from tearing at the piercing point.
Two types of septa are available: A Black septum and a Grey septum.
The Black septum is 3 mm thick. Besides being the most all-round septa of the two, it is especially
recommended for testing flat packages, as the thicker rubber material allows for the Flat mono needle to
be used. This needle head provides good sealing without requiring penetration of the needle tip into the
interior of the package - see "Needles" on page 31 for details.
The Grey septum is 1 mm thick and very flexible, which makes it especially suited for packages that
become round when inflated.
When choosing a piercing point on a package you should avoid seams and areas with labels and
adhesives. The package should, if anyway possible, be pierced in the middle in order to ensure that the
package inflates evenly.
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