Model HESS Hall Effect Speed Sensor

Brand: Red Lion Controls

The Hall Effect Speed Sensor (HESS) is ideal for sensing steel gears or other ferrous targets from 0 to 10 kHz. 

This sensor does not have a minimum threshold speed as does a magnetic pickup sensor. 

However, when the sensor is first powered up, the output state is indeterminate (Hi or Lo) when the sensor is not detecting metal. 

The unit operates from a 8-30 Vdc power supply and is reverse polarity protected. 

The sensor face can be mounted flush into metal panels. 

The case is stainless steel and is supplied with 10 feet (3 meters) of cable. 

The stranded shield wire is not connected to the sensor circuit or case.
  • Detects steel sensing gears or other ferrous targets
  • NPN open collector output
  • Operates from 0 to 10 kHz
  • 3/8" diameter stainless steel case
  • Epoxy encapsulated for oil, dirt and moisture resistance
  • Ideal for tachometric inputs


Cable Length

  • 10 feet (3 meters)


  • Maximum

Electrical Connectors

  • 3-Wire, 22 AWG with Stranded Shield Wire & 100% Foil Coverage

Electrical Protection

  • Reverse Polarity

Enclosure Finish

  • Epoxy for Oil, Dirt & Moisture Resistance

Enclosure, Body Material

  • Stainless Steel


  • 0 to 10 kHz

Materials of Construction

  • Cable Jacket: Grey PVC

Operating Temperature

  • -25° to 70° C (-13° to 158° F)


  • 1 V, Maximum
  • 30 Vdc, Maximum

Output Format

  • NPN Open Collector Transistor

Power Supply

  • 8-30 Vdc at 30 mA - Maximum

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