Inductive proximity sensors allow non-contact detection of objects, are used when the target is metal. These are the most widely used switches in industry including manufacturing, robotics, semiconductor, etc. Inductive sensors detect metallic objects, Magnetic proximity switches detect magnet or ferrous.
As the target enters the sensing range of the sensor, the energy required becomes too great for the oscillator, and it stops. The detection circuit senses this and signals the switch to change state. After the metal target leaves the sensing range, the oscillator resumes functioning, and the switch returns to its normal state (either Normally Open or Normally Closed).