Dynapar - Rotary Feedback products. Innovation, Customization, Delivery.

Innovation, Customization, Delivery

Dynapar encompasses the broadest line of trusted brands in motion feedback control, including Dynapar encoders and Hengstler brand incremental encoders and absolute rotary encoders, Northstar heavy-duty magneto-resistive and Heavy-Duty optical encoders and high-performance Harowe brand resolvers. Only Dynapar feedback solutions offer these world-class rotary feedback brands from one Global Supplier with 3 day delivery on most models for customer peace of mind.

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

The RIM Tach® 8500 is the most reliable magnetoresistive digital tachometer found on the market today. Available in either thru-shaft or end-of shaft models, it is specifically designed to provide feedback for AC and DC drive control systems.RIM Tach® 8500 Digital Tachometer

Quick Specs…

  • High performance feedback for AC and DC drive control systems
  • Thin, pancake style design mounts to motor without bearings or couplings
  • Rugged, zero speed, magnetoresistive sensing technology is unaffected by grease, salt water, dust or other contaminants
  • Highly reliable speed signals for mill duty applications
  • Stainless steel and cast iron construction
  • Resolution to 1200 pulses per revolution

Overview / Design Principle:

The RIM Tach® 8500 is the most reliable magnetoresistive digital tachometer found on the market today. Available in either thru-shaft or end-of shaft models, it is specifically designed to provide feedback for AC and DC drive control systems.

Its ductile cast iron enclosure ensures rugged and reliable performance in the harshest environments. Its bearingless design greatly reduces failures and loading on the system. The RIM Tach® 8500 features a magnetized drum that accommodates large (up to 4.5”) thru-shaft or end-of-shaft mounting.

The RIM Tach® 8500 accepts one or two stainless steel sensor modules with patented magnetoresistive technology. Each module generates A and B signals in quadrature, an optional index pulse Z, and each of their complements (A, B, Z). These reliable sensor modules can utilize DC power from +5 to +15 volts, provide transient and noise suppression, and reverse polarity protection. The 8500 high performance tachometer provides resolutions up to 1200 pulses per revolution, which is much higher than traditional encoders.

Its standard mill duty latching connectors are very easy to wire by simply inserting the stripped conductors into the plug and tightening the screw terminals. There is no need to field solder or to struggle with crimp pins. The unit easily mounts on a standard NEMA180 C face (8.5”) and requires no gap adjustments. The sensor module is very simple to change, just remove four screws and slide the new sensor module in place. Finally, an optional shaft grounding brush can be added to the unit to reduce or eliminate motor shaft currents, thereby increrasing motor bearing life.

Features and Benefits:

  • Rugged Mill Duty Construction
  • Reliable Magnetoresistive Technology
  • Easy Installation


The NorthStar brand RIM Tach® 8500 is a mill duty digital tachometer which provides precise, reliable speed signals for even the most difficult mill processes.


Standard Operating Characteristics

Code: Incremental
Pulses per Revolution: 60-1200
Phasing Sense: A leads B for Counter-Clockwise rotation (CCW) viewing encoder-mounted end
Quadrature Phasing: 90° ± 22°
Symmetry: 180° ± 54°
Index: 270° gated to falling B edge


Input Voltage Requirement: 5-15 Volts DC, 45 mA typical per sensor module plus line driver load
Output Signals: Line Driver, 150mA source/sink
Frequency Response: 0 – 120kHz Data & Index
Electrical Immunity: 2kV ESD, Reverse Polarity, Short Circuit
Connector: 10 pin industrial duty latching, sealed NEMA 4 &12, IP65


Shaft Speed: 5,000 RPM
Mounting Configuration: 8.5” 180C face mount for NEMA MG1 standards
Housing Material: Cast Iron/Stainless Steel
Acceleration Rate: 3600 rpm/sec max
Shaft Length Required: 2.5” min
Allowable Shaft End-Play: ± 0.050”
Allowable Shaft Runout: 0.003” TIR


Operating Temperature Range: -40°C to +80°C
Storage Temperature Range: -40°C to +120°C
Humidity: to 98% RH (non-condensing)
Shock (Sensor Module): 1 meter drop test, 30 G’s Min
Vibration: 18 G’s @ 5-2000 Hz spectrum

Available Specifications:

Related Products & Resources:

For additional information or to receive a full-line catalog, contact your Dynapar representative at 1.800.873.8731 or visit their web site at: www.dynapar.com
Headquarters:1675 Delany Road • Gurnee, IL 60031-1282 • USA
Phone: 1.847.662.2666
Fax: 1.847.662.6633
Email: custserv@dynapar.com or dynapar.techsupport@dynapar.com
© 2009 Dynapar Corp. Printed in U.S.A. • Feedback Quick Reference Guide P/N# N-FLB130 (11/09) 5M

Call Joliet Technologies TODAY 

If you have any questions concerning Dynapar products, feel free to contact us:
Phone (815) 725-9696,
Toll Free (866) 492-9888,
Fax (815) 725-9393 or
E-mail info@joliettech.com

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.