Variable Reluctance Speed Sensors

Are also known as Variable Reluctance (VR) speed sensors that consist of a wire wrapped around a permanent magnet and pole piece. This is similar to a coil winding, solenoid or DC motor. The magnetic speed sensor does not require external power and usually has two leads which are power and ground. When used in speed applications, the tooth of a ferrous target (usually a gear) moves within a proximity of the sensor and generates voltage. The frequency of the rotating target can then be translated into a speed for the given application which depends on the diametral pitch, diameter of the target wheel and dimensions of each tooth.


  • No external power supply required    
  • High reliability. long life    
  • Simple 2- wire installation                             
  • No moving parts or contacts                      
  • Operating Temp -40°C to + 230°C                
  • Wide variety of styles and sizes                  
  • Pole piece from .040" to 311"                      
  • Spade, conical, round or blind pole piece available
  • Customized versions available
  • Adapts to various configurations

Sizes Available


.150" to .866 diameter

UNF Thread

1/4-28 to 3/4-16

Metric Thread

M12X1.25 to M22X1.5

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