Vacuum integrity of cans, jars, and bottles

After preserving jars are filled and closed they must be vacuum-tested in fully automatic operation to immediately sort out any defective containers. During transport of the jars an eddycurrent sensor scans the lid shape that is generated by the vacuum in a non-contacting way. The subsequent electronic unit calculates lid bending, which directly depends on the internal pressure, with high accuracy. After comparing this value with a specified permissible value range a decision is made about the quality of the internal pressure and thus about the tightness of the preserves container.

(MVA95)

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Eddy current sensors for displacement and position

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