Example 2

A wearing part according to the present invention and a light emitting device to be used in a method according to the present invention is interconnected as shown in FIG. 1.

A wearing part (i.e. a dynamic sealing made from a polymer material according to the present invention and incorporating a rubber band, according to a preferred embodiment of the present invention), in which the optical fibres are fitted with splitters/lenzes and interconnected with connectors and reflectors, which is a multiplicity of splitters, is used in a method for detecting excessive wear of a wearing part according to the present invention. A schematic representation is shown in FIG. 3.

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