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High-integrity inductive sensor detecting metal parts and e.g. revealing occupied rail track section, has additional testing coil enabling periodic proof testing of sensor coil
High-integrity inductive sensor detecting metal parts and e.g. revealing occupied rail track section, has additional testing coil enabling periodic proof testing of sensor coil
The sensor is a conventional inductance (5), in an oscillatory circuit. It has a second coil (8), a test coil with its own oscillatory circuit, which can be activated for the purpose of testing the sensor, over a predetermined interval.
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