Hall-Effect Speed Sensors (SNDH-H Series)

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he SNDH-H Series Hall-Effect Speed Sensors use a magnetically biased Hall-effect integrated circuit to accurately sense movement of ferrous metal targets. The specially designed IC (integrated circuit) and a permanent magnet are sealed in rugged, probe-type packages. The flux density of the permanent magnet alters when approached by ferrous metal. This is detected by the Hall ICs. If the sensor is positioned at the circumference of a revolving gear wheel, for example, it detects the teeth and tooth spaces, supplying a digital pulse output with frequency proportional to gear wheel speed. Optimum performance is dependent upon variables which must be considered in combination: target material, geometry and speed, sensor/target gap, and environmental temperature.


  • Solid state, non-contacting Hall-effect magnetic sensing allows the device the ability to sense through dust, dirt and debris, enhancing reliability and product life
  • Air gap up to 2,5 mm [0.098 in] allows sensor to be up to 2,5 mm away from target
  • High frequency switching capability (to 15 kHz) allows the device to handle high RPMs
  • O-ring seal allows device to be sealed into housings
  • Two housing materials allow flexibility within the application
  • High operating temperature [-40 C to 150C (-40 F to 302 F)]
  • Digital current sinking output (open collector) simplifies electrical interfacing to control systems


  • Transportation
    • Engine camshaft and crankshaft speed
    • Transmission speed
    • Vehicle speed
    • Wheel speed
    • Pump speed
    • Motor speed
  • Industrial
    • Flow meters and flow turbines
    • Pump speed
    • Motor speed