Magnet Pickup

Stainless steel housing

Thread: 5/8"-18; 3/8"-24; 3/4"-20 or customized




The magnet pickup speed sensor is especially suitable for sensing speed of gear. Other ferrous discontinuities such as sprockets, keyways, boltheads, etc can also be used as the target.


  • Principles of Operation
        The internal construction of the typical variable reluctance sensor is a magnet, pole piece and coil. A magnetic field (lines of flux) extends from the magnet, through the pole piece and coil out into the air space at the end of the sensor. The return path of the magnetic field is from the air space to the other end of the magnet. As a ferrous object approaches the tip of the pole piece, the magnetic field increases and then decreases as the object moves away from the pole piece. The snap or the rapid change in the magnetic field induces an AC voltage signal in the coil. With an ideal target and matching sensor, the induced voltage is in the shape of a sine wave.

As can be seen, the generated frequency signal is directly proportional

   to the number of ferrous objects passing the pole piece per unit time.

   The amplitude of the voltage output is proportional to the speed of the

   ferrous objects passing the pole piece.

  • Installation
        Mount the sender close to the target, typically 0.5-1mm
  • Wiring 
        Red wire -- Signal output (G);
        Black wire -- Ground (-)