Omnipolar or Bipolar Hall Effect Switch

The HM series of sensors is based on Hall Effect sensor technology, which can sense a change in target motion from true zero to 20 KHz. These sensors require that the target be a magnet, such as magnets embedded in gear teeth, blade tips, or ring magnets. The advantage of this series, versus other Hall Effect types, is that they can sense longer air gap distances. These sensors integrate a preamplifier/signal conditioner within the sensor housing that provides excellent noise immunity and greater transmission capability. The output frequency of these sensors has a square pulse waveform (digital) that directly relates to the number of turbine blades, gear teeth, etc. that have been sensed. These pulses, in turn, can be correlated to determine flow rate, RPM, or velocity.

Installation Considerations

Pulse Output Options

  • TTL/CMOS (Standard); fan-out of 5 TTL/CMOS loads
  • 10V square wave
  • Open collector
  • Supply tracking:
    logic 0: 0.4 VDC
    logic 1: (VS-0.2)xRL/(RL+2200)


  • Up to 0.250" dependent on target geometry, magnet construction and sensor construction

Interconnection Options

  • Three (3) pin MIL-C-5015 type connector with gold plated pins; mates with MS3106-10SL-3S; other connector types upon request
  • Pigtail with wires or cable
  • NPT threaded body with wire or cable pigtail for explosion proof environments

Pin/Pigtail Connection

  • Pin A (Red): Input Power (+)
  • Pin B (White): Pulse 1 Output (+)p
  • Pin C (Black): Common (-)

Physical Features:

  • Operating temperature: -40°C to +105°C
  • Storage temperature: -65°C to +170°C
  • Body material: 300 series stainless steel
  • Encapsulation: epoxy potting or hermetically sealed, welded construction
  • High Shock and Vibration Resistance (MIL-STD-202G Method 214A, Test Condition H)


  • CE compliant to EMC Directive 2004/108/EC for use in residential, commercial, light industrial and heavy industrial environments


  • Unconditional one (1) year warranty if used within specifications
Atex Certified: Custom & Standard Speed Sensors for Intrinsically Safe applications (also approved by CSA w/NRTL/C)