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ZapFree Fiber Optic Encoder

Photonics.com
Apr 2006
Micronor Inc.Request Info
 
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: www.micronor.com; e-mail: sales@micronor.com

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



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GLOSSARY
optical fiber
A thin filament of drawn or extruded glass or plastic having a central core and a cladding of lower index material to promote total internal reflection (TIR). It may be used singly to transmit pulsed optical signals (communications fiber) or in bundles to transmit light or images.  
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