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XR850 (SMARTSafe™) Magnetic Encoder

XR850 SMARTSafe 8.5" modular incremental quadrature rotary encoders are a breakthrough in hazardous duty encoders.  They are ATEX/IECEx, cULus approved and offer reliable no-bearing construction!  SMARTSafe encoders can be used in UL gas and ATEX/IECEx gas and dust hazardous environments.  Also available:  hollow shaft models (XR45, XR47, XR685), shafted models (XR4F, XR485), no-bearing modular encoders to fit other flange sizes (XR56, XR67, XR85, XR115, XR125, XR850), and modular sensors (XR5, XR12).

For Level 2 applications requiring ATEX/IECEx Zone 2 or 22 or UL Class I, Division 2, Groups A,B,C,D, use the XR850 directly in your application, with no barrier, isolator or cable gland required.

For Level 1 applications requiring ATEX/IECEx Zone 1 or 21 use the XRB1 or XRB2 isolator in your control cabinet which permits the use of intrinsically safe wiring instead of explosion proof conduit or glands. The XR850 can also be used in UL Class I, DIV 1 and Zone 0 applications using the XRB2 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 XR850 directly on your main application shaft. Vibration, shock, liquids, dust and dirt won't harm SMARTSafe XR850 encoders! Paint booths, draw works, coil tubing rigs...XR850 can keep them all working 24-7-365. 

Eliminate the biggest cause of industrial encoder failure eliminate the bearings with XR850 hazardous duty encoders.

XR850 (SMARTSafe™) Magnetic Encoder

Technical specifications

  • Operating Power

    5-24VDC in/out

  • Current

    In: 10.6V Out: 150mA, In/Out 150mA, In/Out 150mA

  • Output Format

    A Quad B with marker (A,A\; B,B\, Z,Z\)

  • Frequency Range

    0 to 165 KHz

  • Speed

    5000 RPM Max.

  • Environmental


  • Fits NEMA 8.5" Flanges
  • Fits Shafts up to 4 1/2" [115mm]
  • ATEX/IECEx Rated for Zone 1, 2, 21 & 22 Applications
  • Ideal for Oil and Gas Drilling
  • No Bearings to Wear Out
  • Up to 5000 PPR
  • Self-Diagnostic LED and Alarm Output
  • 3 Year No-Hassle Warranty
  • cULus Class I Division 1 Groups A,B,C,D Listed
  • cULus Class I Zone 0 Group IIC
  • cULus Class I Division 2 Groups A,B,C,D Listed

Latest Application Notes