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Fiber Optic Rotary Encoders
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Micronor MR310/MR320 series are the only 100% Passive Fiber Optic Incremental Encoders on the market today. The innovative design is based on an all-optical, passive sensor linked to a remote interrogator module via a industry-standard fiber optic link. Features include:
  • Passive optical sensor eliminates need for remote power supply, isolation barriers and EX cabinets
  • Immune to EMI, RFI, lightning and ground loops
  • Standard temperature range -40C to +80C; Optional Extended temperature range -60C to +150C
  • ATEX categorized as "simple apparatus"
  • EX classified "inherently safe" for use in mines, oil rigs, petrochemical plants, etc.
  • Eliminates need and expense for isolation barriers, special EX cabinets, etc.
  • Provides interference-free encoder feedback over long distances
  • Outperforms resolvers and electronics-based encoders in challenging environments

    The original MR310 series was launched in 2004 and granted U.S. Patent 7,196,320. Our product launch customer Frey AG uses the heavy duty MR316 sensor and MR310 interrogator for control of aerial cable cars installed in mountain resorts and cities all over the world. One of these is the Portland Tram in Portland, Oregon. In 2009, Micronor launched the first commercially-available, MRI-compatible encoder. In 2011, Micronor launched the second generation MR320 series of fiber optic incremental encoders.

    Fiber optic encoders provide interference-free feedback in challenging environments such as mines, steel mills and oil rigs. The diagram below illustrates a typical application where the fiber optic encoder is used to provide noise-free, closed loop feedback for precise control of a VFD or High Voltage Drive system:

    We recommend the MR320 series for new applications but the MR310 series is still available. For MR320 product info, scroll down or use these direct links:

  • MR320 Controller Module
  • Standard 360ppr Sensors: MR322 MR326
  • High Resolution 1024ppr Sensors: MR324 MR325
  • MRI-Compatible 360ppr Sensor: MR328

    >>Article: Fiber Optic Rotary Encoder Offers EMI Immunity in Harsh Environments
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    MR320 | Controller for MR320 Series Fiber Optic Incremental Encoders
    The MR320 is the remote interface for the new 2nd Generation MR320 series ZapFREE Fiber Optic Incremental Encoder System. The MR320 series Controller and Sensors are identical to the original MR310 series with the following enchancements:
  • User friendlier Duplex LC (push-pull) interface
  • Optical loss budget increased to 12.5dB
  • Encoder links up to 2.5 km

    MR320 Controller Module offers multiple built-in interfaces for compatibility with PLC and motor drive systems:

  • Dual quadrature outputs: A/A'/B/B' line driver and A/B push-pull
  • Dual analog outputs (4-20mA and 0-10V); fully programmable for POSITION or SPEED
  • Programmable 24-bit POSITION COUNTER supports single or multiturn applications
  • MULTIPLIER/DIVIDER function drives separate A/B quadrature outputs
  • Built-in RS422/RS485 serial interface
  • Built-in Modbus-RTU interface
  • Built-in USB interface
  • Supports RS232 with optional MR232-1 adapter
  • All internal operating parameters are user programmable using supplied ZAPPY software
  • ATEX classified "intrinsically safe optical radiation" [Ex op is 55C/T6] per IEC 60079-28

    For application note AN112 on how to interface the MR320/MR330 Controllers to National Instruments LabVIEW, please click here.

    To download the MR310/MR320 Controller's ZAPPY configuration software, please click here.

  • Downloads: datasheet | manual | drawing | image | CAD_Files | ATEX_Declaration
     
    MR322 | ZapFREE® Size 58mm Fiber Optic Incremental Encoder, up to 360ppr
    MR322 series Incremental Encoder offers 100-360ppr resolution in an industry standard Size 58mm encoder housing. The sensor is ideal for motor speed control and low resolution position monitoring. Like all of Micronor's fiber optic encoders, the MR322 is a passive sensor which is immune to EMI and is ATEX classified as a "simple apparatus" for use in all manner of hazardous locations and explosive environments. Standard temperate range is -40 to +80C while the Extended Temperature option can operate over -60C to +150C.

    How to choose the right fiber optic encoder for your application:

  • For general purpose applications up to 360ppr resolution, we recommend the MR322 sensor
  • For VFD or similar drives requiring 1024ppr feedback, use MR324 Hollow Shaft or MR325 Shaft sensor
  • For heavy duty indoor/outdoor applications, see MR324 Hollow Shaft or MR325/MR326 Shaft sensors
  • For MRI applications, see MR328 MRI Safe Sensor
  • For fiber optic annemometer applications such as underground mines, please contact Micronor sales for special low friction models with ceramic bearings
  • If you need an absolute position sensor, see MR330 series
  • Downloads: datasheet | manual | drawing | image | CAD_Files | ATEX_Declaration
     
    MR324 | ZapFREE® Size 100mm Hollow Shaft Incremental Encoder, 1024ppr resolution
    MR324 High Resolution (1024ppr) Hollow Shaft Incremental Encoder is ideal for closed-loop feedback of variable frequency drives (VFD) and other high capacity/high voltage motor drives operating in challenging environments. The MR324 is a totally passive sensor, immune to EMI and can transmit interference-free over distances up to 2500 meters. An Extended Temperature option offers -60C to +150C operation.

    For hazardous locations and explosive atmospheres, the passive optical sensor is ATEX classified as a "simple apparatus" - greatly simplifying installation and reducing cost versus conventional electronics-based encoders and resolvers. Typical applications include:

  • Oil rigs, including top drives and draw works
  • Steel mills and similar meltshop applications
  • Mines, especially ideal for control of long conveyor systems
  • Coal bins, grain elevators and other hazardous dust atmospheres
  • Downloads: datasheet | manual | drawing | image | CAD_Files | ATEX_Declaration
     
    MR325 | ZapFREE® Size 125mm Fiber Optic Incremental Encoder, 1024ppr resolution
    MR325 Series High Resolution (1024ppr) Incremental Encoder is ideal for closed-loop feedback of variable frequency drives (VFD) and other high horsepower motor drives operating in challenging environments. The MR325 is a totally passive sensor, immune to EMI and can transmit interference-free over distances up to 2500 meters.

    For hazardous locations and explosive atmospheres, the passive optical sensor is ATEX classified as a "simple apparatus" - greatly simplifying installation and reducing cost versus conventional electronics-based encoders and resolvers. Typical applications include:

  • Oil rigs, including top drives and draw works
  • Steel mills and similar meltshop applications
  • Mines, especially ideal for control of long conveyor systems
  • Coal bins, grain elevators and other hazardous dust atmospheres
  • Downloads: datasheet | manual | drawing | image | CAD_Files | ATEX_Declaration
     
    MR326 | ZapFREE® Size 90mm Heavy Duty Incremental Encoder, up to 360ppr resolution
    MR326 series is a heavy duty Size 90mm shaft sensor for heavy equipment applications with high bearing loads and requiring robust shaft seals. Features include:
  • IP66 ingress rating (resistant to powerful water jets)
  • Resolution options are 100, 128, 256 and 360 ppr
  • Optical link to MR320 Controller can extend up to 2500 meters
  • Temperature range options include Standard (-40C/+80C) and Extended (-60C/+150C)
  • Intrinsically safe - ATEX classified Simple Apparatus for use in mines and other EX rated hazardous locations
  • Downloads: datasheet | manual | drawing | image | CAD_Files | ATEX_Declaration
     
    MR326-MRAD | Fiber Optic Measuring Wheel System
    The Fiber Optic MRAD Measuring Wheel System is designed for challenging environment test and monitoring appications where EMI immunity and/or long distance feedback is required. A special Measuring Arm (part number 9350.02.093) and tufted rubber-coated Wheel (part number 9350.02.095) has been designed for use with the MR326 Fiber Optic Incremental Encoder (360ppr resolution). Sample applications include:

  • Monitoring wheel speed of electric wheelchair during dynamometer testing (EMI immunity required)
  • Monitoring rotation of the new High Roller ferris wheel in Las Vegas
  • Monitoring conveyor system in high voltage process environment
  • EMC and Dynamometer test suites
  • Downloads: datasheet | manual | drawing | image | CAD_Files
     
    MR328 | ZapFREE® MRI Safe Fiber Optic Incremental Encoder, 360ppr resolution
    MR328 MRI Safe Sensor is a non-metallic version of the MR322 Sensor - developed specifically for applications requiring electromagnetic and RF transparency:
  • MRI facilities
  • EMC test labs
  • Anechoic chambers
  • Industrial applications operating under extreme electromagnetic fields
  • Downloads: datasheet | manual | drawing | image | CAD_Files | ATEX_Declaration
     

     

     

     

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