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ZapFree Fiber Optic Encoder

Micronor Inc.Request Info
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For Harsh & Hazardous Environments
NEWBURY PARK, Calif., April 21 -- Micronor Inc. said its new M314 ZapFree high-resolution hollow shaft fiber optic rotary encoder for harsh and hazardous environments was designed to accomodate the needs of large-drive applications that require EMI immunity, higher resolution (1024 ppr) and the mounting convenience of a hollow shaft encoder package. No integral electronics are located within its encoder housing, and its all-optical design requires just a single optical fiber connection.

zapfree.jpgThe company said the encoder’s passive design outperforms conventional optical or magnetic rotary encoders; it enables wider temperature operation (-60°C/+150°C), outdistances copper encoder links (up to 1000 meters), is immune to lightning/high-voltage static/plasma fields, is radiation resistant and is intrinsically safe (and ATEX compliant).

The "passive" MR314 optically links to the "active" MR310 ZapFree remote encoder interface (REI) module via a single 62.5/125 multimode fiber link -- up to 1000 meters (3280 feet) away. With a DIN-rail mount, the MR310 module is colocated with the PLC or other system interface electronics, where power supply connections and conventional electrical interface connections are easily made. The module offers a wide variety of standard interfaces: direct quadrature outputs (both open collector and line driver), separate multiplier/divider quadrature outputs, two fully programmable analog outputs (4-20 mA and +/-10 V) and a PC-friendly RS232/RS422/RS485 serial interface.

Like the original MR312 shafted fiber optic encoder, all MR3XX series encoders use telecom-proven wavelength division multiplexing technology by assigning each internal optical path (A or B) to a wavelength so that all wavelengths/paths can be combined onto a single fiber. 

In addition to the MR312/MR314 native incremental encoder mode of operation, the MR310’s firmware allows the encoder to emulate a multiturn absolute encoder. The internal 24-bit counter can track up to 32,768 revolutions of the 1024-ppr MR314 or 23,201 revolutions of the 360-ppr MR312. Either a software command or TTL signal input to the MR310 establishes a calibration or zero reference (resetting the counter to zero). An external battery backup is required to maintain operation during power interruptions. A combination power supply/backup battery trickle charger is available.

Special versions can be easily engineered for thermal-vac environments. An engineering evaluation kit (MR314 and MR310) is $3495; larger quantities are available for as little as $2500. Micronor said typical lead time is stock to four weeks after receipt of an order.

For more information, visit:; e-mail: [email protected]

Micronor Inc.
3483 Old Conejo Road
Suite 203
Newbury Park, CA 91320
Phone: (805) 499-0114
Fax: (805) 499-6585
Apr 2006

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CommunicationsEMIfiber optic rotary encoderfiber opticshollow shaftmagnetic rotary encodersMicronoroptical fiberProductsshaft encoderZapFree

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