The DH Series

The experts at AI-Tek have been designing and manufacturing Hall Effect sensors for harsh applications for over sixty years. With a dedication to providing reliable and accurate sensors, the DH Series product line is developed specifically for the industrial, rail, military and automotive industries.

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AI Tek DH Series Speed Sensors

How the DH Series Works

DH speed sensors can sense each change in target movement, regardless of speed, from near zero to 15 kHz frequency range, generating a steady pulse train of frequency proportional to target speed. Each time a gear tooth (or any ferrous discontinuity) passes in front of the sensor the output changes state. This unique combination of differential sensing technology and calibration makes these sensors highly tolerant of installation misalignment, target geometry and composition, target run-out, vibration and air gap changes.


For applications with cable runs that exceed 500 feet, you will need to use a Digital Signal Distance Amplifier (DSDA).



Key Features of the DH Series

Suitable for 32 diametral pitch or coarser gear (target), the standard catalog sensors are easily applied to your various sensing needs. If you have a unique, special requirement that cannot be met with any of the standard options, we will gladly review your specs and work with you on a special sensor design.



  • High temperature range of -40°C to +125°C
  • Supply Tracking or TTL Compatible output options
  • Power on calibration
  • Requires special alignment
  • Controlled duty cycle
  • Fine pitch performance
  • Increased air gaps
  • Wide range of supply voltage in single design of 4.5 - 24 Vdc
  • Special circuitry provides high level of EMI hardness
  • Reverse voltage protection, up to -30 Vdc, to prevent damage if miswired
  • Rugged sensors designed to meet the toughest Navy ship-board standards to European Railroad Applications
  • Select versions equipped with RTD temperature measurement output

More Active Speed Sensors from AI-Tek

In addition to the DH Series, AI-Tek Instruments also offers other active (hall effect) speed sensor products, including the RH and BH Series. 

AI-Tek Resources

Not sure which speed sensor makes sense for your application? Use the AI-Tek Product Finder to find out.


Use the AI-Tek calculator to ensure that your sensor selection will produce enough output for your application.



Get In Touch

Are you ready to make a purchase or looking for more information on a specific product? Get in touch with someone from AI-Tek or find a distributor near you. If you have a unique, special requirement that cannot be met with any of the standard options, contact us to learn more about custom sensor options.