Product Details


Large Bore Hazardous Duty Encoder Sensor

  • Fits Shafts up to 7 7/8" [200mm]
  • Ideal for Oil and Gas Drilling
  • Fully Potted Electronics
  • Up to 8192 PPR
  • Wide Sensor-Rotor Gap: No Shimming or Scraping
  • 3 Year No-Hassle Warranty
  • cULus Class I, Div 1 Listed, Groups A,B,C,D
  • cULus Class I, Div 2 Listed, Groups A,B,C,D
  • ATEX IECEx Rated: Zone 1 & 2, 21 & 22
  • cULus Class I Zone Group IIC

XR12 SMARTSafe™ modular incremental quadrature encoder sensors enable the world's first hazardous duty rotary encoders with removable electronics.  They are cULus, ATEX and IECEx certified and offer incredibly reliable no-bearing construction!  SMARTSafe sensors can be used in ATEX/IECEx gas and dust and UL gas hazardous environments.  Also available:  hollow shaft models (XR685), shafted models (XR485), no-bearing modular encoders (XR125, XR850), and modular sensors for smaller bore applications (XR5).

For applications requiring ATEX/IECEx Zone 2 or 22 or cULus Class I, Division 2, Groups A,B,C,D use the XR12 directly in your application, with no barrier, isolator or cable gland required.

For applications requiring UL Division 1, ATEX/IECEx Zone 1 or 21 protection use the XRB3 isolator in your control cabinet which permits the use of intrinsically safe wiring instead of explosion-proof conduit or glands. The XR12 can also be used in UL Class I Div 1 & Zone 0 applications using the XRB3 Isolator.

Unlike the competition, Avtron SMARTSafe encoder systems are protected against short circuits, power-to-output wiring, and output-to-ground faults.

Instead of mounting a tiny optical encoder with weak bearings on a wobbling stub shaft, mount XR12 directly on your machine and install the rotor on your main application or motor shaft.  Vibration, shock, liquids, dust and dirt won't harm SMARTSafe™ XR12 encoders!  Paint booths, draw works, coil tubing rigs...XR12 can keep them all working 24/7/365.

Eliminate the biggest cause of industrial encoder failure--eliminate the bearings with XR12 hazardous duty encoder sensors!

Operating Power: (add cable drive current as req'd)

   Division 1, Zone 1 (XRB3): 12-24VDC in/out, 150 mA

   Division 2, Zone 2: 5-24VDC in/out, 150 mA

Output Format: A Quad B with marker (A,/A, B,/B, Z,/Z)

Frequency Range: 0 to 165 kHz

PPR: 8-8192

Speed: 6000 RPM Max. (contact factory for higher speeds)

Maximum Cable Length: 

   Division 1, Zone 1: Encoder 500' Isolator 1000'

   Division 2, Zone 2 (5 to 12 VDC in): 500'

   Division 2, Zone 2 (15 to 24 VDC in): 250'

Rotor Positioning: +/-0.100" [+/-2.54mm] movement/misalignment

Sensor-Rotor Gap: 0.045", +0.015/-0.040" [1.14mm+0.38/-1.0]

Temperature: -40°C to 80°C (Storage -40°C to 100°C)

Environmental: Electronics-IP67 (see manual for details)

Vibration: 5-2000Hz, 18G; 100G Shock

Weight: 2.2 lbs. [1kg]


   ATEX/IECEx Zone 1 & Zone 21 Group IIC

   cULus Class I, Division 1 and Zone 0 Group A,B,C,D*

   ATEX/IECEx Zone 2 & 22 Group IIC

   cULus Class I, Division 2 Group A,B,C,D

*See installation drawings for Warnings and Limitations

  • Sensor PPR can be factory reprogrammed
  • Full protection against short circuits, reverse voltage, phase-to-phase shorts
  • Shrugs off dirt, oil, and water contamination
  • No glass disks to break or optics to fail
  • Sensor for XR125 encoder
  • Direct machine-mount capability
  • Self-Diagnostic LED and Alarm Output

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