What are Inductive Sensors?
Inductive proximity sensors function so that ferrous metals in the proximity of the active surface (sensing area) will produce oscillations that lead to a change of state. Unlike a capacitive proximity sensor that oscillates when the target is present, an inductive proximity sensor oscillates until the target is present.
By applying a voltage to the oscillator coil, an alternating inductive field is created in front of the active surface (sensing area) of the unit. When a metallic object (e.g. steel, aluminum, copper, brass etc.) enters the sensing field from any direction, it causes the state of the oscillator to be modified until the threshold trigger is inverted. This induces a change in the condition of the final stage and the consequent command of an external load.
In inductive ring sensors, sensing is made within the ring itself. The sensor is activated when a metallic object is introduced within it. When choosing an inductive ring sensor, select a size based on the minimum hole diameter required.
AECO Inductive Proximity Sensors Catalog