Bearing-less Encoder features heavy-duty construction.

Press Release Summary:

RIM Tach 8500 is ruggedly designed with stainless steel sensor modules and ductile cast iron housing. Sensor module uses magnetic technology that delivers 70 thousandths air gap, promoting product reliability and application forgiveness, while axial play of up to 0.50 in. facilitates installation. Wheel design has metal edge guard that protects magnetic wheel material from accidental strikes and allows wheel to lock to shaft without shaft damage.

Original Press Release:

Next Generation Rim Tach 8500 Encoder Launch

Gurnee, IL - Dynapar announces the next generation RIM Tach 8500, our heavy duty bearing-less encoder which is a part of the industry leading NorthStar product portfolio. This next gen RIM Tach product delivers superior ease-of-installation and a robust, rugged design demanded by customers for tough vector-motor applications.

The next generation design continues the RIM Tach tradition with stainless steel sensor modules and ductile cast iron housing. The sensor module uses a new rugged magnetic technology that delivers a 70 thousandths air gap, the largest sensing gap in the industry. For ease-of-installation, the new RIM Tach 8500 is designed with a generous axial play of up to 0.50 inches and does not require any precision tools or measurements.

Dynapar's Next Gen Rim Tach Features:
  • The largest non contact air gap in the industry which greatly improves product reliability and application forgiveness.
  • A new wheel design which includes a metal edge guard to protect the magnetic wheel material from accidental strikes and allows the wheel to lock to the shaft without shaft damage.
  • A convenient diagnostic LED to provide visual status of encoder functionality.
  • New sensor and wheel combinations that are backwards compatible with old housings for convenient and economical upgrade ability to the new technology.

    For further information, please visit

    As with its predecessor, the RT8 is built to order and available for the general market starting June, 2011. Dynapar will continue to redesign and release the other RIM Tach series (RIM 1250, RIM 6200) products over the course of the year. The RT8 will be marketed under the NorthStar brand name and will be manufactured in the company's Gurnee, IL manufacturing facility. For new or existing applications and volume pricing, contact a Dynapar representative at 800-873-8731 or visit the web for specifications and technical information.

    About Dynapar
    Dynapar is a manufacturer of optical and magnetic encoders and resolvers with more than 50 years of experience in engineering and manufacturing rotary feedback devices. Dynapar was founded in Gurnee, Illinois in 1955 and has been expanded through the acquisitions to include Dynapar(TM) Hengstler(TM), NorthStar(TM), Harowe(TM), and Encoder Technology brand product lines. .

    Pioneering the first true vector-duty hollow-shaft encoder launched Dynapar's strong presence in several industries, including steel, paper, elevator, oil and gas, wind energy, medical, material handling, and industrial servo manufacturing. From small kit encoders to large mill-duty tachometers, Dynapar has the industry covered.

    Dynapar customers rely on expertise and support provided from the U.S. sales and manufacturing location in Gurnee, Illinois: Phone +1 800.873.8731 or +1 847.662.2666; FAX +1 847.662.6633; Website: In addition, Dynapar supports global customers with local sales and production locations in Germany, Japan, China, and Brazil.

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