As of March 26, 2010 Joliet Technologies is no longer representing the Avtron line of products.

We do however represent the Dynapar line of Rotary Feedback Products.

Avtron – Tachs, Tachometers, Encoders, Rotary Pulse Generators

Joliet Technologies is the preferred Avtron Integrator for the Chicagoland area.

Tachs, Tachometers, Encoders, Rotary Pulse Generators 

M4 Universal Encoder


The Avtron M4 is a Digital Rotary Pulse Generator/Tach/Encoder specifically designed to provide precise, accurate, reliable feedback to drive systems and process control systems in today’s industrial world.


  • Fits All Motor Frame Sizes
  • Lowest Total Installed Cost – Less Time and Less Hardware
  • Bridging the Gap Between Rugged and Cost Effective
  • Sealed Enclosure with Condensate Drain
  • Optional Second Isolated Output
  • Optional Marker Pulse
  • Rugged Cast Housing
  • Optional Shaft Grounding Kit
  • Heavy, Mill-Duty

Solid Shaft Encoder and Hollow Shaft EncoderCheck the availability of this model. Visit Tachometers Availability for more information.


The M4 has a high resolution incremental output of up to 1200 pulses per revolution (PPR). It uses a magnetoresistive sensing circuit for precise resolution and accuracy. The code wheel is a metal disk, not glass or plastic, for maximum reliability.


The rugged design of the M4 makes it perfect for virtually all industrial applications in the paper, metals, textiles, plastics, and converting industries. The enclosure seals out contamination in dusty or wet environments. The rugged cast housing will stand up to the conditions and handling usually found in these industries, rated IP66.

Motor manufacturers have spent many years improving the performance of standard, cast iron, industrial motors. The pulse generator that is used with these motors should be equal to the task. The M4 does just that.

M4 Solid Shaft Encoder
Solid Shaft (View M4 Brochure or Instruction Sheet)

The M4 uses features from more expensive, heavy, mill-duty designs into a cost effective package. Because of its versatility, it can be used in a wide variety of applications and industries. It can be a NEMA 56C FACE MOUNTED pulse generator with a 5/8″ diameter shaft (Figure 1), or a HOLLOW SHAFT unit for a more universal mount on shafts up to 2 3/8″ in diameter (Figure 2). Metric shaft sizes are also available.

M4 Hollow Shaft Encoder
Hollow Shaft.

The M4 can be used as a feedback device in AC and DC drive applications, or for instrumentation purposes into process computers, speed meters, or programmable logic controllers. It has been tested to withstand the electrically noisy environment created by high frequency AC drives.

An optional SECOND ISOLATED OUTPUT allows users to send a signal to two different locations. One can be used for drive feedback and the other can be used for instrumentation purposes, or as an on hand spare.

Optional Accessories

  • Foot Mounting Bracket
  • Second Isolated Output
  • Shaft Grounding Brush
  • Multiple Connector Options
  • Through Shaft Design
  • Marker Pulse

Specifications and features are subject to change without notice.

Call Joliet Technologies TODAY 

If you have any questions concerning Avtron’s Tachs, Encoders, and Pulse Generators, please contact us by:
Phone (815) 725-9696,
Toll Free (866) 492-9888,
Fax (815) 725-9393 or

Joliet Technologies custom packages, integrates and engineers AC Variable Frequency Drives (VFD), DC Variable Speed Drives (VSD) and AC Drive Controllers using top of the line manufacturers, like ABB, Emerson-Control Techniques, Siemens and Saftronics (Fincor). Our custom drive packages are built to your specifications for your application. We specialize in large horsepower drive systems (500Hp and above). Call us at (815) 725-9696 or fax us at (815) 725-9393 or e-mail us or fill out an RFQ with your requirements. Serving the greater Chicagoland area and the World.