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About BEI Sensors
“The Power of 3”

BEI Sensors was formed in 2010 as a merger between BEI Industrial Encoders, BEI Duncan Electronics and BEI Ideacod.  Serving the industrial, military/aerospace and transportation markets, BEI Sensors utilizes ‘The Power of 3’ expert divisions, providing an extensive product line, engineering expertise and unparalleled product support.  Specializing in reliable position sensing products for harsh environments, BEI Sensors can supply a range of products from standard off-the-shelf products to completely customized solutions for any challenging application. 

The comprehensive product line includes rotary and linear position sensors, potentiometers (wirewound, conductive plastic and hybrid), Hall Effect sensors, absolute and incremental encoders, panel controls, electronic interface modules, wireless modules, and a variety of product accessories.  Specialized products for harsh environments include those certified for hazardous area use, wash-down environments and extreme operating temperatures.

BEI Sensors’ experienced customer service staff offers some of the most highly rated pre and post sale service in the industry.  The order department can get you answers on pricing and availability, order status, or help you order a unit that will meet your exact requirements.  Our highly trained application specialists are available to help with your technical needs - whether you need assistance with an interface issue or would like help crossing over a competitor part number. We provide this high level of service to an active customer base of thousands of companies.  Everyone at BEI Sensors works toward a common goal - to produce the best products and deliver the best customer service found anywhere.

Experience what BEI Sensors and “The Power of 3” can do for you.  Call 800-350-2727 or contact us here.

Please check our employment opportunities.

For more information about our own company, BEI Industrial Encoders, please follow the link to the Welcome statement.

Rotary Incremental Encoders 
Rugged, reliable, industrial quadrature encoders, including the industry standard Model H25® and Model H20®, the HS35 and HS25 hollow-shaft styles, as well as ultra heavy duty and explosion-proof models.

Hazardous Area Products
Specially designed encoders and electronics with "Explosion Proof" and "Intrinsically Safe" ratings. 
 

Express Encoders®
Express Encoders are available in six package styles to choose from (four quadrature encoders and two absolute encoders), over 2,000 different configurations.

Linear Cable Transducer 
Cable transducers provide digital linear position and speed information in a rugged, easy-to-install package. 

 

Wireless Industrial Interface for Encoders 
 

BEI's SwiftComm wireless encoder interface was designed from the ground up to meet the wireless demands of industrial motion control applications.  It provides an extremely robust wireless signal in real time over a secure network. 

SwiftComm uses a point-to-point frequency-hopping 2.4 GHz RF protocol and will interface directly with any incremental or SSI absolute encoder.  Simply connect the SwiftComm transmitter to the encoder and the SwiftComm receiver to your control system and apply power.  That’s it!  No complicated cabling required.

What are the advantages of SwiftComm?

• Real Time Wireless Control
  SwiftComm's wireless point-to-point configuration allows data to be relayed between the transmitter and receiver every 600 microseconds (µs) with no inherent latency.
• Robust Wireless Signal
  Adaptive Frequency Hopping Protocol helps avoid data interruptions due to frequency interference.  Patent pending SwiftComm wireless technology can even overcome data loss due to link interruption.
• Secure Wireless Transmission
  Proprietary protocol, 40-bit hard coded security code and random frequency hopping all provide additional levels of data security to assure that your data is protected.

Our Most Popular Single-Turn Absolutes   

Model H25®
Optical Absolute Encoder
(up to 13 bits of resolution;   replaces KAS25, RAS25, M25)

Model.HS35
Optical Hollow Shaft
Absolute Encoder

Absolute Optical Encoder
Model H25®
2 pgs/ 87k

For H25 Absolute Output Information, 
see table below. 

Absolute Optical Encoder
Model H25X
2 pgs/ 83k

For H25X Absolute Output Information, 
see table below.

Hollow Shaft Absolute Optical Encoder Model HS35
2 pgs/ 85k

For HS35 Absolute Output Information, 
see table below.

size 25 Rotary Absolutes at 13 bits or less Serial Output options available

Absolute Optical Encoder
Model L18
2 pgs/ 110k

For L18 Absolute Output Information, 
see table below.

Specialty Encoders

Absolute Optical Encoder
Model H38
2 pgs / 67k

For H38 Absolute Output Information, 
see table below.

Absolute Optical Encoder
Model H40
3 pgs / 157k

For H40 Absolute Output Information, 
see table below.

Multi-Turn Absolutes

PDF:

Multi-turn Absolute Encoder
Model HMT25
2 pgs / 96k

For HMT Absolute Output Information, 
see table below.

Quick Find - Absolute Encoder Output Spec Sheets

Shafted Incremental Encoders   

Model H20®
Incremental OpticalEncoder,
Quadrature Encoder

Model H25®
Incremental Optical Encoder,
Quadrature Encoder

 

Incremental Optical Encoder
Model H20®

Incremental Optical Encoder
Model H25®

Rotary Incremental Optical Encoder
Model L15

Model L25
Rotary Incremental Optical Encoder

PDF:

Rotary Incremental Optical Encoder
Model L25

Rotary Incremental Optical Encoder
Model E25

Model HS20
Hollow Shaft Encoder,
Incremental Encoder

Hollow Shaft Optical Incremental Encoder
Model HS20

Hollow-shaft Incremental Optical Encoders Model HS22

Model HS25
Hollow Shaft Encoder,
Incremental Encoder 

Model HS45
Hollow Shaft Encoder,
Incremental Encoder
 

Hollow Shaft Optical Incremental Encoder
Model HS35

Model HS35 Drawworks Encoder

Hollow Shaft Optical Incremental Encoder
Model HS45

Model HS52
Incremental Explosion Proof Hollow Shaft Encoder

PDF:

Incremental Explosion Proof Hollow Shaft Encoder Model HS52

Model HS52 Installation Instructions 
 

Optical Incremental Encoder
Model H20®
Note: To order stainless, add -S to model number and specify on PO.

 PDF:

Optical Incremental Encoder
Model H25®
Note: To order stainless, add -S to model number and specify on PO.

Rotary Incremental Optical Encoder
Model H38

Rotary Incremental Optical Encoder
Model H40

Rotary Incremental Optical Encoder
Model ES20 

ES Encoder Series Installation Instructions

PDF:

Rotary Incremental Optical Encoder
Model ES25 
 

ES Encoder Series Installation Instructions
 

Hazardous Environments
 

Do you need encoders designed for hazardous environments? To keep pace with the growth of complex industrial processes, BEI has developed rugged, quality encoders that meet high standards and certifications for use in potentially explosive environments. BEI brings you specially designed encoders to meet your appropriate specifications. There are a variety of protection methods available depending on the circumstance of a particular installation. For optical encoders, the most commonly used methods are explosion proof construction and intrinsic safety, detailed below:

EXPLOSION PROOF CONSTRUCTION METHOD
In this encoder protection technique the equipment is contained in an enclosure that can withstand an internal explosion of the most volatile gas-to-air mixture that can penetrate into the interior of the encoder enclosure. The enclosure must contain the explosion without damage and without allowing the flame to leave the enclosure through any joints or other openings. BEI Sensors has released the encoder industry's first ATEX and UL rated explosion proof hollow shaft encoder, Model HS52.

INTRINSIC SAFETY METHOD
This encoder protection technique uses an apparatus that limits the maximum level of current and voltage (usually measured as energy in millijoules) that can be delivered into the hazardous location. This equipment ensures that even in a double fault condition, there will not be enough energy to ignite the gas or vapor in that area. Note that encoders that use this method of protection, must use energy limiting devices (commonly called Barriers) in their installation. An Intrinsically Safe encoder, installed without an Intrinsic Safety Barrier is not an Intrinsically Safe system.

Hazardous Area Encoders and Electronics

Model H25® Incremental Encoder
As the flagship of the BEl Industrial Encoder Division product line, the H25 is designed for the industrial machine tool marketplace.

Incremental Optical Encoder Model H25® 
(4 pgs/240k)

Model HS25 Hollow-shaft Incremental Encoder
Rating only available with 4469 output driver. This low-profile encoder design, just 2" deep, is easily mounted on a through encoder shaft.

Hollow Shaft Optical Incremental Encoder Model HS25  
(4 pgs/242k)

Model HS35 Hollow-shaft Incremental Encoder
The HS35 combines the rugged, heavy-duty features in a hollow-shaft style.

Hollow Shaft Optical Incremental Encoder Model HS35 
(4 pgs/218k)

Model HS35 DrawWorks Optical Hollow-Shaft Encoder
This specifically configured DrawWorks Model HS35 encoder combines rugged, heavy-duty features into a unique through-shaft style for use as a winch-turns counter in the DrawWorks system of oil rigs.

DrawWorks Hollow-Shaft Encoder Model HS35 

Model HS45 Hollow-shaft Incremental Encoder
The HS45 is a large bore, heavy duty, rugged encoder designed to operate in very demanding environments.

Hollow Shaft Optical Incremental Encoder Model HS45 
(2 pgs/137k)

Model H38 Explosion Proof Optical Encoder
The H38 is an explosion proof version of the field-proven H25 encoder series.
MSHA Rotary Incremental Optical Encoder Model H38 
(2 pgs/308k)
Rotary Incremental Optical Encoder Model H38 
(4 pgs/238k) 
Rotary Absolute Optical Encoder Model H38
 

Model H40 Shock Proof Optical Encoder
The H40's ultra heavy-duty housing totally isolates the encoder from severe shock and shaft loading conditions.
Rotary Incremental Optical Encoder Model H40
(4 pgs/239k)

Environmentally Sealed Optical Encoders

Model ES25 Sealed Incremental Encoder

• 2.5" diameter
• Resolution up to 2,048 CPT
• IP67 environmental rating

Model ES20 Sealed Incremental Encoder

• 2.0" diameter Incremental Encoder
• Resolution up to 1,024 CPT
• IP67 environmental rating

Stainless Steel Optical Encoders

Back to Top

Model H25® Stainless Steel Optical Encoder 

• 2.5" diameter Incremental Encoder
• Resolution up to 5,000 CPT (72,000 CPT with interpolation)
• 304 stainless steel body & bearing housing

Model H20 Stainless Steel Optical Encoder 
 

• 2.0" diameter Incremental Encoder
• Resolution up to 1,024 CPT (4,096 CPT with interpolation)
• 304 stainless steel body & bearing housing

DrawWorks Encoders

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Model HS35 DrawWorks Optical Hollow-Shaft Encoder

• 3.5" diameter Incremental Encoder
• Resolution up to 5,000 CPT
• Hard-anodized metal housing and sealed connector
• Dual bearings and shaft seals for NEMA 4 and 13 (IP65) ratings

DrawWorks Hollow-Shaft Encoder Model HS35 (2 pgs/128k)

DrawWorks Encoder Installation 
(4 pgs/266k)

• 3.5" diameter Incremental Encoder
• Dual M18 Connectors
• Hard-anodized metal housing and sealed connector
• IS Rating
• Dual bearings and shaft seals for NEMA 4 and 13 (IP65) ratings

Dual Output DrawWorks Hollow-Shaft Encoder Model HS35 (1 pgs/293k)

DrawWorks Encoder Installation 
(4 pgs/266k)

Shock Proof Optical Encoders

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Model H40 Shock Proof Optical Encoder - Incremental or Absolute

• 3.75" diameter Incremental Encoder
• Incremental model: Resolution up to 3,600 CPT (72,000 CPT with interpolation)
• Absolute model: 13 Bits resolution (Max)
• 100+ lb. bearing
• Internal shock absorbers

Explosion Proof Optical Encoders

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Model H38 Explosion Proof Optical Encoder - Incremental or Absolute

• 3.75" diameter
• Incremental model: Resolution up to 5,000 CPT (72,000 CPT with interpolation)
• 13 Bits resolution (Max)
• NEMA Class 4X and 6(outdoor non-hazardous) and
• NEMA Class 4X and 13(indoor non-hazardous)

Rotary Incremental Optical Encoder Model H38 (4gs/243k)
Rotary Absolute Optical Encoder Model H38 (4 pgs/243k)

Model HS52 Explosion Proof Hollow Shaft Optical Encoder - Incremental

• 5.2" diameter
• Resolution up to 5,000 CPT (80,000 CPT with interpolation)
• UL: Class I, Div I, Groups C & D and
• CENELEC II 2 G Ex d IIB T4 IP66

Explosion Proof Hollow Shaft Incremental Encoder Model HS52
Explosion Proof Hollow Shaft Encoder Model HS52 Installation Instructions

Extended Temperature Testing of Encoders 
 

If your application requires encoders to be exposed to extreme temperatures, extended temperature testing is available for many BEI encoder models. All BEI encoders have a standard operating range of 0 to +70 degrees Celsius. Ordering your encoder with an extended temperature test ensures it will operate from as low as -55 degrees Celsius to as high as +105 degrees Celsius.

Optical Isolator Module

This DIN rail mounted encoder interface lets you connect an encoder to a variety of controllers, or to multiple input devices. It provides an optically isolated signal and is available with one of four output driver options making it compatible with all major counter, drive and PLC components. Multiple modules can be daisy-chained together and drive as many as eight different devices from a single encoder. 

The interface module also provides LED output indicators for two quadrature channels and an index. All circuitry for the module is packaged in a housing that mounts to a standard external DIN rail. For ease of installation, a 75 mm length of DIN rail is supplied with each module.

Intrinsic Safety Barrier

This Galvanically Isolated Intrinsic Safety Barrier is the perfect complement to BEI encoders for hazardous environments. It is electrically compatible with all popular counters, PLCs and controllers, and it features isolation for power and three signal channels, as well as LED indicators for power and data - all in a single DIN rail package.

The BEI Barrier carries CENELEC, UL and cUL ratings and is suitable for long cable runs. Since it also carries a nonincendive designation per the National Electrical Code, it can be mounted in Class I, Division 2 areas.

Dual Encoder to USB Converter

This module can handle signals from two SSI absolute encoders or two quadrature encoders and translates the encoder position to industry standard USB 2.0 format. For SSI absolute encoders, the module can be programmed through the USB interface for number of bits, clock speed and position offeset. For incremental encoders, count mode (X1, X2, X4), reset, preset, and preset/reset on index are programmable through the USB input. Optional programmable data sample function allows module to automatically capture readings on an accurate time clock. USB command sets and communication protocol information is detailed in the PDF link below.

Dual Encoder to USB Converter 
4pgs, 169k

USB Driver Download

Four Encoder to USB Converter

The Encoder Converter translates encoder data to industry standard USB 2.0 format that can be read by a computer. The module's four available channels are factory configured for SSI absolute encoders and/or quadrature incremental encoders, in any combination totaling four encoders. USB command sets and communication protocol information is detailed in the PDF link below.

Four Encoder to USB Converter
4 pgs, 297k

USB Driver Download

Encoder Tester

This DIN rail mounted tester is designed to simply and reliably test the operation of any industrial encoder. The tester provides LED output indicators for two quadrature channels and an index as an aid in troubleshooting and equipment set-up. It can be used for field troubleshooting, incoming inspection, and to check the operation of encoded motors. It comes with an instruction booklet that includes connection diagrams for all the common encoder output types and voltages.

Circuitry for the Tester is packed in a standard housing that mounts to an external DIN rail type EN 50 022. For ease of installation, a length of DIN rail is supplied with each Tester.

Anti-Dither Module

This module can solve the problem of extra counts caused by high vibration. The Anti-Dither module accepts quadrature inputs (A and B signals) and sends a single channel signal to the counter circuitry only when there has been true movement of the encoder. This is especially useful in web processes, handling and inspection systems that use conveyors and simple speed or position control in high vibration environments.

Encoder Broadcaster Module

The Broadcaster accepts standard incremental encoder inputs, (two channels in quadrature plus an index and complements) and can broadcast up to four encoder signals to four independent devices. Each of the broadcast signals is optically isolated eliminating ground loops. This compact package also allows for signal processing options, such as anti-dither filter, integer countdown or pulse and direction outputs, to be incorporated into each of the four broadcast signals independently. The broadcaster is ideal for driving multiple receivers from a single encoder in applications like electronic line shafting or synchronization of multiple devices to a single operation.

The module accepts signals from 5 to 28 VDC and provides three output options: Vout = Vin, Vout = 5 V or NPN open collector. The compact package mounts to standard EN 50 022 35mm X 7.5mm DIN rail and is 142mm wide, 78mm deep and 45mm above the DIN rail.  A 155mm section of DIN rail is included.

Serial-to-Parallel Converter

BEI’S serial-to-parallel converter module takes serial data from any BEI Serial Synchronous Interface (S3) or RS-422 Interface (S1) encoders and converts it to a parallel output. This eliminates the high cost and noise susceptibility of long, parallel cable runs, enabling the simplicity of a serial output encoder and a low cost twisted pair cable to interface with a standard PLC or controller. The bright LED indicators give visual status for deserialization, testing and troubleshooting.

Serial input, either SSI or RS-422 is easily selectable by a Format Select terminal directly on the board.  In SSI mode, the on-board clock generates pulses to signal the encoder to provide data.  Data is received serially and converted to a parallel format. Clock frequency is selectable by a Speed Select terminal, again directly on the board.  For 100 feet or less, the 1.25 MHz mode can be used and for longer distances, up to 500 feet, a 200 kHz rate is available.

In RS-422 mode, data is received asynchronously from the encoder and converted to a parallel format. Speed Select input is used to set the baud rate: 19.2 kBaud for most applications, up to 500 feet; 115.2 kBaud for shorter runs below 100 feet.  
 

Serial-to-Parallel Converter Module
2pgs/241K

Power Supplies

More power in a compact, easy- to-install package.

Available in either a 5 volt or a 24 volt version, this supply can deliver 4 Amps (at 5V) or 1.5 Amps (at 24V) to get you that extra bit of power that you need. With a wide range of acceptable input voltages, anything from 85 to 264 VAC (45 to 65 Hz) or 110 to 350 VDC, it's usable in virtually all industrial applications. Transient surge protection is built-in to reduce faults caused by ESD, power-up transients or phase errors. It also has 100% reserve capacity for startup or overload conditions.

Power Supply Specifications

Linear Cable Extension Transducer
Model LT25

The Model LT25 linear cable transducer provides digital position and speed information in a durable, easy-to-install package. The LT25 cable transducer utilizes a flexible cable, a spring-loaded spool, and an incremental optical encoder to precisely measure linear position. Cable transducers are also known in the industry as cable-extension transducers, string potentiometers, draw wire sensors, draw wire transducers, yo yo pots, linear position string pots, string encoders.

The sturdy measuring cable (also referred to as the string or wire) is made of nylon coated stainless steel for ultimate strength with a measurement range up to 125 inches. The LT25's compact profile and IP66 rating makes this a perfect solution to a variety of industrial linear measurement challenges, whether involved in concrete cutting, controlling hydraulic cylinders, metal grinding, or having an awkward access area for measurement.

One of the greatest advantages the linear cable transducer offers is itssimple and adaptable installation. Simply connect the wire to your moving equipment and secure the base to a fixed object. Hard to reach areas and worries about shaft misalignment are now not a problem, as the LT25's flexible design allows for versatile measurement setups with the same interface design as used for rotary axes.

This linear cable transducer unit is ideal for wet, dirty, or outdoor environments and applications where your measuring range travels overharsh environments.

Installing the LT25 Linear Cable Transducer

Step One:
Mount the LT25 securely to a stable, flat surface using the attached L-shaped mounting bracket with 1/4" (6mm) maximum diameter fastener.

Step Two:
Attach the cable using the eyelet provided (M4, #8 screw or /16" pin).

Tips to prevent damage to the measuring cable :

Make certain the cable path is clear of objects or sharp edges to prevent cable damage Damage may occur if cable is released and allowed to retract with no tension

Cable should exit as straight as possible. A pulley may be used to redirect cable path

Flexible Installation Options

The LT25 allows for easy reorientation of the mounting bracket or encoder connector position. This gives users added flexibility in their installation.

How to Change the Mounting Bracket Position

Remove the four screws as shown with a PH-2 (Phillips) driver, reposition in 90° increments, and tighten screws to approximately 13in-lb.

How to Change the Encoder Connector Position

Remove the four cap screws on encoder flange (use a 5/32" hex driver), rotate encoder in 90° increments and tighten the screws to approximately 13in-lb.

SA100R Rotary Encoder Digital Display

This versatile 7-digit display reads out in degrees/minutes/seconds (DMS) or decimal degrees. Resolutions up to 0.001 degree are selectable from the front panel. The SA100(R) accepts a 5VDC standard differential quadrature signal from either linear or rotary incremental encoders. Incremental and absolute operating modes are available. The SA100(R) also features an auxiliary reference input, allowing integration of an independent reference marker from a remote switch. The SA100(R) comes with its own 12VDC power supply which operates on 115 VAC line voltage. A Setup Mode allows front panel programming of

• automatic calibration
• display resolution
• axis resolution

• count direction
• loss of signal error
• referencing

• angular error
• gear ratio compensation
• table radius factors

SA100 Linear Encoder Digital Display

• display resolution
• axis resolution
• count direction

• signal error detection
• referencing

• error compensation
• scale factors

M58 Metric Incremental Encoder

Model M58 is a European size 58 mm diameter industrial grade metric incremental encoder. It is available with either a standard 10mm shaft or 6mm shaft.  The M58 provides a wide range of resolutions, up to 80,000 cycles per turn.  Built to industrial standards, the M58 provides excellent resistance to shock and vibration.  IP65 environmental protection level is standard or IP67 is available with sealing flange.  This allows the M58 to work exceptionally well in dirty or wet environments commonly found in industrial applications. The M58 is readily available with standard configurations in stock for quick delivery.

Ready for Quick Delivery

Motor Adapters
Adapters PDF  (2 pgs/173k)

Accessories
Accessories PDF (1 pg/51k)

High-load Bearing Assemblies:
Foot-mounted & Flange-mounted
 

Thermoplastic Adapter
& NEMA 34/42

 

NEMA 23

Model TBS200 (replaces Model TBS20)
Low-Profile Panel-Mount Trackball
200 Counts per Revolution

With the drive to ever more compact systems, the TBS200provides an ideal solution for highly precise control in a smaller package. Its low profile consumes a mere 1.5 inches of below panel space.

This trackball has found wide use in industrial machine control, medical equipment, video mixing machines and graphic workstations.

Model TBS200 Spec Sheet
2 pgs, 397k

For critical applications that require a precise cursor contol solution, the TBS225 trackball system has no match to its simple, intuitive, robust design. It provides accurate and reliable motion input to your system with a 2.25-inch ball and superior feel.

Medical scanning systems, machine tool equipment, graphic displays, robotics, and military applications utilize these superior features.

Model TBS225 Spec Sheet
2 pgs, 385k