Magnetic Proximity Switch Working Principle

These magnetic proximity sensors can detect the exact position of the pig from outside the wall of the stainless steel pipe.

Magnetic proximity switch working principle.

An ac magnetic field is generated on the detection coil and changes in the impedance due to eddy currents generated on a metallic object are detected. Strong magnetic fields can cause standard inductive proximity sensors to latch on. The solution is to make sure that the sensor is rated for the ambient temperature in the application. There are several operating principles used including reed switches gmr inductive variable reluctance magneto resistive or hall effect sensors.

A radio frequency oscillator is connected to a metal plate. Proximity sensors comprise of a permanent magnet and a pick up coil. Look for sensors designed properly by a reputable manufacturer and or look for sensors specifically designed to work at higher temperatures. These switches sense distances to objects by generating magnetic fields.

Detection principle of inductive proximity sensors inductive proximity sensors detect magnetic loss due to eddy currents that are generated on a conductive surface by an external magnetic field. Magnetic proximity sensors are actuated by the presence of a permanent magnet. Working principle of magnetic proximity sensor. Inductive proximity sensors are used for non contact detection of metallic objects.

The presences of a magnetic field makes the thin plates flex and touch each other causing an electrical contact. These proximity switches have the disadvantage of being more sensitive to objects that conduct electricity than to objects that do not. Detection through plastic wood and any non magnetisable metals. The presence of a metallic object actuator in the operating area causes a dampening of the oscillation amplitude.

Their operating principle is based on the use of reed con tacts whose thin plates are hermetically sealed in a glass bulb with inert gas.