Magnetic encoders: Exploring the options

An encoder is a sensing device that translates either linear or rotary motion into a predictable electrical output. Measurement Specialties develops innovative custom packaged solutions for rotary sensing applications using magnetic sensing technology. 

When it comes to magnetic encoders, there are a variety of options available to meet a customer’s specific needs. This article highlights some of Measurement Specialties’ offerings available through Durham Instruments.

• The ED-17 magnetic encoder is an absolute encoder with nine-bit resolution. The device can be easily mounted onto an existing shaft. The serial output provides absolute angular position information, even when power is cycled. 
• The ED-18 Series magnetic encoder can be used as either a rotational feedback sensor or as a human machine interface (HMI) device. As a light-duty feedback sensor, it can provide rotation speed, direction or positioning information. The analog output provides absolute angular position information even when power is cycled on and off. As an HMI device, it can be used as a rotary input control for use on instrumentation panels. 
• The ED-19 Series magnetic encoder is designed for medium-duty feedback applications. Resolutions are available from 64 to 1,024 counts per revolution. The magnetic technology used in the ED-19 series is plug-in compatible with existing encoder products, with the added advantages of an extended temperature range and fully sealed electronics. 
• The ED-20 Series magnetic encoder is designed for medium-duty industrial feedback applications with ball bearing supported shaft. Resolutions are available from 200 to 1,024 counts per revolution. This encoder series also features line drivers with active termination for long cable runs and reverse voltage protection. The ED-20 also offers the option of high-voltage differential, low-voltage differential or open collector (NPN) outputs. An index channel, which offers a pulse every 180 degrees, is also included. The magnetic technology (magneto resistive) used in the ED-20 series offers many advantages over conventional optical encoder technology, such as sealed electronics and extended temperature ranges, the company says. 
• The ED-21 Series magnetic encoder is designed to replace traditional mechanical potentiometers. It is offered with a ball bearing supported shaft. The magnetic technology used in the ED-21 offers advantages over conventional electromechanical potentiometers, with sealed electronics, extended temperature ranges and virtually unlimited life since there are no mechanical parts to wear out.
• The ED-22 Series magnetic potentiometer can be used to replace a conventional potentiometer. It offers 270 degrees of electrical travel, integrated rotational stop system and 300 degrees of mechanical travel, and utilizes a sleeve bearing and shaft fitted with an O-ring seal. This sensor is designed for rotary HMI applications. It is well suited for industrial applications where temperature extremes, high vibration and shock, and contamination are present. 

For details on these and other encoder options, contact Durham Instruments. 

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