 Welcome to this video on inductive proximity sensors. Inductive proximity sensors are electronic devices designed to detect metal objects. The internal solid-state oscillator circuit inside this housing causes a pulsating magnetic field to be emitted from the end of the housing. Whenever a metal object enters this magnetic field, the moving flux lines induce small eddy currents on the object's surface. Because power is needed to make these currents flow, energy is drained from the oscillator circuit causing its amplitude to decrease. A trigger circuit inside the sensor detects the change in amplitude and causes the sensor output to switch on. When the metal target moves out of the magnetic field, the oscillator regenerates and the sensor output switches back to its normal state. Inductive sensors detect both ferrous metals which contain iron and some non-ferrous metals which do not contain iron. To be detected, the target must be made of a metal into which any currents can be induced. Inductive sensors are ideal for environments in which grease or dirt builds up on the sensor or target because the magnetic field is not affected by these conditions. See if you can answer the following four questions about inductive proximity sensors. You have completed this video on inductive proximity sensors.