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MR342 Rotary Incremental Encoder



ZapFREE® Size 58mm Fiber Optic Incremental Encoder

The MR342 series ZapFree® Fiber Optic Incremental Sensor is an entirely passive, intrinsically safe, fiber optic incremental rotary encoder – ideal for a wide range of harsh and hazardous environmental applications. The passive, all-optical sensor connects to the remote Controller via a standard duplex 62.5/125 multimode optical fiber link.

The remote MR340 Controller Modules transmit and convert optical signals to/from the sensor. The Controller’s multiple built-in interfaces insure compatibility with industry standard motor drives, PLCs, quadrature counters and motion control systems.

ZapFree    NEC


Measurement Parameters
Resolution 256, 360ppr (Consult Micronor for special requirements)
Max Speed 8,000 RPM continuous
Mechanical Parameters
Moment of Inertia 1.0585E-6 kg*mm2
Starting Torque 1.28E-5 N*m
Max Shaft Loads Radial = 80 N (18 lbf), Axial = 40 N (9 lbf)
System MTBF L10 Bearing life calculated at 50% of max. radial and axial load at 2500 RPM:

1.78E+05 hours (20.3 years)

Optical Interface
Optical Interface LC Duplex, 62.5/125μm Graded Index Fiber, 0.275NA, Type OM1
Link Length Up to 2000 meters with MR340 Controller
Explosive Atmospheres Inherently Safe, Simple Mechanical Device
EX Classification Inherently safe, simple mechanical device when used with MR340 Controller
IEC Ex EPL Mb/Gb/Gc/Db/Dc
Environmental Attributes
Temperature/Humidity -40°C to +80°C, 0%-95% RH (non-condensing)
Ingress Protection IP64 (splash proof)
Physical Attributes
Housing Dimension Ø 58mm x 58mm
Unit Weight 210 g (7.25 oz)
Materials Body: Anodized Aluminum; Shaft and Bearings: Stainless Steel

Specifications subject to change without notice


  • 100% passive sensing design – no electronics whatsoever
  • Sensor can be installed in all manner of hazardous locations and potentially explosive atmospheres – mines, gas and dust
  • Immune to EMI and RFI for safe use in and around medical equipment and “noisy” industrial environments
  • Immune to lightning and high voltages
  • Outdistances copper, link lengths to 2000 meters
  • Temperature range -40°C to +80 °C
  • Special versions can be engineered for radiation and vacuum environments
  • Compatible with MR340-1 DIN Rail Mount Controller


Call +1-805-389-6600 or email

Ordering Information

MR342-X06YYY where X=Resolution and YYY= Optical Interface
X Options: B=128ppr C=256ppr D=360ppr
YYY Options: C1R5=1.5m Pigtail , C03=3m Pigtail, C05=5m Pigtail, D00=IP-LC Interface
MR340-1 DIN Rail Mount Controller

Quick Ship Configurations

MR340-1 DIN Rail Mount Controller
MR342-D06D00 Size 58mm Encoder, 360ppr, IP-LC Interface
MR398-H26-DD010 IP-LC to IP-LC Extension Cable, Length=10m
MR398-T26-CC003 Duplex-LC to Duplex-LC Extension Cable, Length=3m
MR320D IP-LC to Duplex-LC Bulkhead Adapter

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