| 摘要 |
The invention relates to a proximity or presence switch arrangement operating by the inductive principle, which contains at least one inductor integrated in an oscillating circuit and an electronic control device connected downstream, for sensing and evaluating the approach and/or presence of a material which influences electromagnetic fields. Arrangement characterised in that the inductor (3) integrated in the oscillating circuit (2) is designed as a secondary coil of a coil system (6) similar to a transformer, in that the corresponding primary coil (7) is subjected to an excitation signal generated by a control device (8) present in the primary circuit (7'), and in that the evaluation device (4) carries out at least one scan of the flow of current produced in the secondary circuit (3') and emits (a) corresponding evaluation signal(s) or triggers a corresponding similar action.
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