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TD5392 MRI Safe Pull Tape Incremental Encoder System

MRI String Encoder


ZapFree   MR


ZapFREE® MRI Safe Incremental Pull-Tape Encoder System

The all-optical MRI safe incremental position sensor is coupled to a purpose-built accurate pull string mechanism which measures the pay-out of a film strip that is attached to the cradle. One end of the film is secured to the cradle while the far end of the string is wound up on a drum. When the cradle moves, the film is either pulled from the drum, or retracted onto the drum. The measurement is made by a precision pulley attached to the MR348 MRI safe incremental encoder. The pulley is a sprocket wheel that engages into the sprocket holes of the film, preventing slippage over the measuring wheel. Any small minute change in film pay-out is monitored via the A/B quadrature output signal.

Contact Micronor sales for more information.


Measurement Parameters
Maximum Payout 1600 mm (4m possible)
Resolution 0.1053mm (with 4-edge triggering)
Repeatability ±0.2mm (Std Dev)
Accuracy ±0.1mm (Std Dev)
Speed 500 mm/s
Acceleration 250 mm/s²

Specifications subject to change without notice


  • Medical
  • MRI
  • Robotics
  • Industrial


  • 100% passive optical sensor
  • MRI safe design
  • Immune to EMI, RFI, lightning and ground loops
  • Immune and invisible to magnetic fields
  • Inherently Safe, Simple Mechanical Device


Contact Micronor sales for Product Data Sheet


Call +1-805-389-6600 or email

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