Jaquet EX12A - VRS Sensor for use in Explosive Atmospheres w/M12x1 1.5" Thread

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The Jaquet EX12A series Variable Reluctance Speed (VRS) sensors consist of an iron core, an inductive coil and a permanent magnet. A ferrous pole wheel passing the sensor face changes the magnetic field strength, resulting in an AC Voltage being induced in the coil. The frequency of the output signal is proportional to the speed of the moving target. The amplitude of the signal depends on speed, air gap, geometry of the target, magnetic properties of the target material and the electrical load. VRS sensors, also known as passive or electromagnetic sensors, do not require an external supply.

The EX12A is specifically designed for use in explosive atmospheres.


  • Signal Output: the signal frequency is proportional to the target speed
  • Thread Length: 1.5" M12x1 thread
  • 0-20 kHz Frequency Range
  • Housing: M12x1, tightening torque: max. 12 Nm
  • Connection: Connector, M12x1 thread, 4-pins, black
  • Coil Inductance: 170 mH +/-10% at 1 kHz
  • Coil Resistance: 850 Ohm +/-10%
  • Coil Magnet Polarity: North pole towards front face
  • Operating Temperature: -104-257°F (-40-125°C)
  • Protection: IP68 (Sensor) / IP67 (Cable)
  • Insulation: housing and electronics galvanically isolated (Test: 500V, 50 Hz for 1 minute)

Additional Info

  • VRS Sensors
  • Connector
More Information
Manufacturer Jaquet
Length 1.5" Thread Length
Output Proportional to Target Speed
Size M12x1
Type VRS Sensors
spec_sheet Jaquet_EX12A_Specs.pdf
Additional Details

Please Note: We are currently experiencing delivery issues with this manufacturer. Contact us at 1-800-446-4035 for details and to order over the phone.

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