Sensor systems used in production units are, by their very nature, exposed to all kinds of situations where they can easily be damaged. This can result in sensor failures, which in turn lead to machine downtimes and maintenance overheads, the costs of which are continually escalating, due to the increasing complexity of installations and the consequent rise in the number of sensors used. For this reason, increasing sensor operating reliability is a matter of high priority. The reliability of the devices themselves has, in fact, reached a level today that leaves little to be desired – provided that their specification limits are not exceeded. In practice however, even when taking the utmost care, this cannot always be permanently guaranteed. For this reason, there is a growing interest for sensors having as wide a “misuse tolerance” as possible. This is particularly valid for inductive devices, which from the quantity point of view, generally dominate the European and USA markets.