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Fiber Optic Absolute Rotary Encoders

What type of encoder does your application require?

  • Absolute encoders (also called  position sensors) are used where monitoring absolute position and high precision are required. Their signature output is a digital value of absolute position. Even if an absolute encoder loses power, the system will always report it current true position upon start-up.
  • Incremental encoders are used where speed and relative position need to be monitored, and typically offer lesser resolution than an absolute encoder system. Their signature outputs are A/B quadrature pulses. The user’s motion control system tracks these pulses (phasing determines direction) to monitor relative position from intial Home setting. The same system measures the time between pulses to track speed. If  the system loses power,  all position and speed information is typically lost.

Micronor Sensors offers two series of fiber optic type absolute rotary encoders; the MR330 and MR430 series. Both are based on an all-optical passive sensor and remote interrogator control module.

The MR330 series is the product of choice for high precision and longer distances. It uses 62.5/125 multimode fiber and can operate up to distances of 300m

The MR430 series offers a smaller form factor.  It uses 1mm POF and POIF fiber and can operate up to distances of 30m.

Quick Guide for FO Absolute Encoders and FO SSI Encoder Extender System
MR430_Org
MR430-1 Controller
  • Distance up to 30m (100ft)
  • DIN form factor
  • Operating wavelength 645nm
  • Duplex 1mm POF and POIF fiber
  • 13-Bit Single Turn Mode: 0.044° resolution, 0.5° accuracy
  • 25 bit SSI Mode: 13-bit single turn and 12-bit multi-turn
  • Refresh rate 850us (1.17kHz)
  • Programmable 4-20mA and 0-10V analog outputs
  • Digital SSI, RS485/ModbusRTU and USB interfaces

 
 

MR431 Encoder
  • Rotary, size 11
  • Duplex 1mm M-POF, Plastic Optical Fiber
  • 2200 rpm max.
  • Non-metallic, all-dielectric construction for Medical, MRI, and Industrial applications

 

MR330 Fiber Optic Absolute Encoder
MR330-1 Controller
  • Distance up to 300m (985ft)
  • DIN form factor
  • Operating wavelength 850nm
  • Duplex OM1 62.5/125 multimode fiber
  • 13-Bit Single Turn Mode: 0.044° resolution, 0.09° accuracy
  • 14-Bit Single Turn Mode: 0.026° resolution (13,950 counts), 0.06° accuracy
  • 25 bit SSI Mode: 13-bit single turn and 12-bit multi-turn
  • Alt 26-bit SSI Mode: 14-bit single turn and 12-bit multi-turn
  • Refresh rate 850us (1.17kHz)
  • Programmable 4-20mA and 0-10V analog outputs
  • Digital SSI, RS485/ModbusRTU and USB interfaces
MR332/MR338 Encoders
  • Rotary, size 58mm
  • Duplex OM1 62.5/125um multimode fiber
  • 2500 rpm max.
  • MR332: Metallic housing, shaft and bearings for Industrial applications
  • MR338: Non-metallic construction for Medical, MRI and Industrial applications