They are sensors developped to detect magnetic fields generated by a permanent magnet or even an electromagnet.

On the frontal part of the sensor there is an electronic component sensitive to the magnetic field, which if excited by a magnet it changes its characteristic generating a signal to the sensor output stage.

As the sensor detects magnetic field, there is no standard distance for the sensor, since we have no standard default target, i.e. a magnet with standardised magnetic field value. Thus, the greater the intensity of the magnetic field generated by the magnet, the greater the sensing distance.

In applications with linear valves or pneumatic cylinders.