Inductive proximity sensor is a self-contained rotation speed monitoring sensors have the special feature of incorporating, in the same case, the pulse sensing and processing electronics as well as the output switching amplifier that are required to establish an integrated rotation monitoring device. The unit provides an economical solution for detecting slip, belt breakage, drive shaft shear and overloading, etc., in the following applications conveyor belts, bucket elevators, Archemedian screws, grinders, crushers, pumps, centrifugal driers, mixers, etc.