Optical Rotary Encoders - Rugged and Precise Speed
and Position Encoder Products
Optical sensing technology is the most precise and
offers the highest resolution of the position sensing
technologies. Rugged construction and years of field
proven service makes BEI optical rotary encoders ideal
for operating in harsh industrial environments including
oil well drilling, machine control, agricultural machinery,
web process control, robotics, elevators, construction
equipment, cranes, motor feedback and any closed loop
control systems. BEI optical encoders are available
as incremental, absolute single-turn, and absolute multi-turn.
BEI Sensors programmable encoders offer resolution flexibility
to match changing needs while also saving on inventory
costs and reducing machine downtime.
An incremental encoder produces a series of square
waves as it rotates. The number of square wave cycles
produced per one turn of the shaft is called the encoder
resolution. Generally, incremental encoders provide
more resolution at a lower cost than their absolute
cousins. They also have a simpler interface because
they have fewer output lines.
These encoders are ideal for applications where relative
movement is desired. They are available as shafted or
hollow shaft (blind and through) in package sizes from
1.18" (30mm) to 5.2" (132.08mm).
This type of industrial encoder provides a "whole word"
output with a unique code pattern representing each
position. This code is derived from independent tracks
on the encoder disc (one for each "bit" of resolution)
corresponding to the individual photodetectors.
Single-turns are ideal for applications where a device
moves at a slow rate under one rotation or is inactive
for long periods of time. These encoders are available
as shafted or hollow shaft (blind and through) in package
sizes from 2.3" (58mm) to 4.6" (116mm).
Similar to absolute single turn encoders, however multi-turns
are ideal for applications where a device moves at a
slow rate with multiple rotations or is inactive for
long periods of time. They are available as shafted
or hollow shaft (blind and through) in package sizes
from 2.3" (58mm) to 4.3" (109mm).
Express Encoders are popular configurations of our
standard model encoders that ship in 3 days or less
with no expedite fees. Some models can ship same day
– please consult factory. With six package styles
(four incremental and two absolute) to choose from,
over 2,000 different configurations - that will meet
just about any need.
Industry-leading selection of UL and ATEX certified
encoders and intrinsically safe barriers. Encoder certifications
include UL Class I Division 1 and 2, Class II Division
1 and 2, as well as ATEX Zone 1 and Zone 2.
Programmable encoders offer flexibility to match the
changing needs of the end user while also reducing machine
downtime and saving on inventory costs. With a programmable
encoder, users can produce a wide range of resolutions
from just one encoder. In other words, this versatile
encoder can be reprogrammed so that the adjusted resolution
meets the needs of different applications.
Safety Integrity Level (SIL) rated encoders and Performance
Level (PL) rated encoders to meet functional safety
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