Working Principle Of Inductive Sensor

By applying a voltage to the oscillator coil an alternating inductive field is created in front of the active surface of the unit.

When a metallic object (steel, aluminum, copper, brass etc.) enters this field from any direction and the state of the oscillator is modified until the threshold of the trigger is inverted this induces a change in the final stage and the subsequent command of an external load. The intervention distance depends on the type of metal and as described earlier, in the reduction factors. All the sensors are protected against inversion of polarity and electrical disturbances of inductive sources and can be supplied with short circuit protection in the D.C. version. The main advantages offered by proximity sensors in relation to normal limit switches are mainly unlimited duration as they have no moving parts (wheels, springs etc.) lack of maintenance requirement and elimination of possible false contacts due to contact movement.