Model 121 Auto-Aligning Modular



AT LAST! A reliable modular encoder that requires no calibration, gapping, or special tools to install! We have taken the performance of modular encoders to a new level with the Model 121 Auto-Aligning Modular Encoder. This new and innovative design provides simple, reliable, hassle free installation. Simply tighten the shaft clamp, install the mounting
screws, and you’re done!

The Model 121 incorporates the latest Optical ASIC technology for greatly enhanced performance. Common problems with other modular encoder designs are warping and deflection, caused by their extensive use of plastic, both of which are virtually eliminated by
the Model 121’s all metal construction. For brushless servo motor applications, the Model 121 can be specified with three commutation tracks to provide motor feedback. The optional 100° C temperature capability allows servo motors to operate at higher power outputs and duty cycles.


  • Simple, Hassle Free Mounting
  • Accepts Larger Shafts up to 15 mm
  • Up to 12 Pole Commutation Available
  • 0° to 100° C Operating Temperature Available
  • Patented Design – #6,608,300B2
  • Includes New IP50 Dust Seal Kit

For more information on our full range of incremental rotary optical shaft encoders, please contact us.

Model 121 Encoder Data Sheet

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