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 

Heavy, Mill-Duty Encoders:
Setting the Air Gap on M285 SMARTachTM Sensors

Loosen and tightening of the locknut.

This procedure assumes you have followed the instructions supplied with the pulse generator for installing the rotor, the stator, and mounting the sensors into the stator housing.
Make sure the motor is de-energized and the motor shaft is stopped before setting the sensor air gap.
You will need a 7/16″ Nut Driver to perform this procedure.

Step 1:
Loosen 7/16″ Locknut until the Quick Release Pin slides toward motor shaft.

Step 2:
Tighten the Locknut securely.

Pulling the pin animation

Step 3:
Pull the Quick Release Pin.

Swapping plug and pin animation Step 4:
Pull Black Rubber Plug and insert it into slotted hole to keep dirt out of sensor.Step 5:
Store Gapping Pin in round hole on sensor or in a tool box for safe keeping.

Tach Instruction Sheets can be found on the Avtron website.
The links below will open a new browser window of the Tach section on the Avtron site.

M285 Instruction Sheet

Questions on PDF? Visit FAQ’s on PDF

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.