| 摘要 |
A device for monitoring the probability of inductive proximity sensors (1) which are used to monitor the position of moveable points parts or rail part s. The proximity sensor (1) comprises at least one coil (5) which is fed by an oscillator (7) . The sensor current flowing as a function of alterable attenuation is measured and fed to an evaluation circuit. Characteristics (18,22) of the sensor for the profile of the sensor currents as a function o f the distance of the moveable points or rail parts, i.e. mechanical attenuation, are stored in an electric, non -additionally attenuated state a nd an electric, additionally attenuated state. The measuring currents (22) corresponding to a mechanical attenuation state and the corresponding additionally electrically attenuated measuring currents are cyclically scanned. The respective measuring currents or pairs of measuring values are supplied to a comparator and evaluation circuit wherein differences arising from the characteristic curves are compared with the measured differences.</ SDOAB>
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