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The M285, M485, and the M685 are SMARTachs. All SMARTachs have special features that make them ideal feedback devices for continuous process industries where reliability is critical and downtime is costly. Among these are field-replaceable sensors with Adaptive Electronics and Fault Check Outputs with diagnostic LEDs for Predictive Maintenance.

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Adaptive Electronics: (U. S. Patent #5,502,376) Every SMARTach is equipped with a microprocessor that monitors and controls the duty cycle of the output waveform. Pulse generators with replaceable sensors can have variations in the output when new sensors are installed. Sensors cannot be perfectly set at the factory due to unknown field conditions. Adaptive Electronics will correct for any field variable to ensure a consistent, accurate waveform throughout the life of the unit. This includes variations caused by changes in thermal and mechanical conditions.

 Fault Check: If the Adaptive Electronics attempts to correct the signal but the waveforms continue to be out of specification, then the Fault Check output will send an early warning signal, before the problem causes unscheduled downtime. If the unit is equipped with the diagnostic LED option shown below, the LED will change from green to red.



SMARTach Models are the M285 in the Heavy Mill Duty Class and the M485 and M685 in the Severe Duty Class. ALL SMARTachs carry the CE label.


There are four basic factors that need to be considered when choosing a pulse generator: The duty class, mechanical mounting, sensor technology, and the electrical requirements.


 Mill Duty (MD): For use in most industrial environments like paper, plastics, and metals. Not recommended for environments with frequent temperature changes and chronically wet conditions. Models available in this class include the M3 M945.

Heavy Mill Duty (HMD): For more rugged environments with periodic temperature fluctuations and increased levels of contamination. Models available in this class include the M285, M585, and M785.

Severe Duty (SD): This rating is for very wet and dusty environments with large and frequent temperature extremes. This includes outdoor applications. Models in this class include the M485 and M685.


Avtron pulse generators can be mounted several different ways. The standard mounting methods include:

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NEMA FC Face Mounting: Requires                    Shaft Mounting: Stub shaft required.

8.5" C-face flange. Maximum shaft                  Shaft depends on the pulse generator

diameter is 3.500". Model M285.                    selected. Models M3, M4 and M685.

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NEMA 56C Flange Mounting: Requires             Foot Mounting: This method is usually used

4.5" C-face and adapter/coupling.              when pulse generators are coupled directly

Models M945, M785, M3, M4, and M485.           to rolls, gear boxes,or motors 

                                               without C- faces. Models M945, M785, M3, M4, and 485.


Avtron uses two different sensor technologies to generate the signals in our pulse generators, photoelectric and magneto-resistive. Both technologies are field proven with thousands of successful installations. The electrical requirements, mounting style, and environmental conditions will influence the choice of sensors.

Photoelectric: Photoelectric sensing technology has been used in our pulse generators since 1975. It has the capability of providing precise, reliable waveforms when used in most industrial environments. The photoelectric sensing circuit uses an LED light source that shines through a rotating disk. The disk is made of either metal or plastic. On the opposite side of the disk is a stationary mask assembly with corresponding slots, and a photocell. As the disk rotates, the photocell sees an interrupted light source and generates a corresponding waveform. A high performance line driver is used to amplify and transmit the signal to the receiving device.


Photoelectric Models include the M3 and M945 in Mill Duty Designs and the M585 and M785 in the Heavy Mill Duty Class.

 Magneto-resistive: Avtron has used magneto-resistive technology in our rotary pulse generators since 1983. Because dust or moisture does not affect it, it is ideal for severe duty applications like paper mills, mines, and dockside cranes. A magneto-resistive sensor detects a rotating wheel that is encoded with a series of magnetic poles on its surface. As the poles pass the sensor, a small change in resistance is detected and pulses are generated as a result. A high performance line driver is used to amplify and transmit the signals to the receiving device. Magneto-resistive Models include the M4 in the Heavy Mill Duty Class and the M485 and M685 in the Severe Duty Class.


The electrical requirements that need to be defined are the operating voltage, the pulses per revolution (PPR), the number of outputs, and the marker pulse. The operating voltage options range from five to 24 volts DC. The PPR choices range from one to 8,192. See pages 12 and 13 of the Avtron Rotary Pulse Generator Brochure for more details.


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