Rotary Encoders are rated for temperatures to 239 deg F.

Press Release Summary:



Compact absolute singleturn and multiturn rotary encoders may be paired with servomotors with axis heights as small as 0.79 in. Absolute rotary encoders provide absolute position value immediately upon switch-on or after power interruption. EQN 1125 multiturn rotary encoders use gear transmission to distinguish between revolutions. Free of maintenance, they transmit absolute position information over serial, bidirectional EnDat interfaces.



Original Press Release:


A Miniature Multiturn Sets New Standards in Size


HEIDENHAIN introduces rotary encoders with 36.5 mm diameter

SCHAUMBURG, IL - (February 2002) - With the development of a new series of compact absolute singleturn and multiturn rotary encoders, HEIDENHAIN distinguishes itself from the other solutions available on the market up to now for applications in production automation, robotics and handling technology. These new miniature absolute encoders (smaller than a golf ball) are truly unique, and enable servomotors with axis heights small as 20 mm (0.79 in.) to be equipped with absolute encoders.

Absolute rotary encoders are especially useful because they provide the absolute position value immediately upon switch-on or after a power interruption. They also obviate complicated reference mark runs of often numerous axes, decrease maintenance and improve the equipment's tolerance to disturbances.

The star of HEIDENHAIN's new series is doubtless the EQN 1125 multiturn rotary encoder since it uses a genuine gear transmission to distinguish between revolutions. Unlike solutions with electronic revolution counters, the mechanical transmission is not susceptible to interfering signals or battery-backup failure. The gear transmission fulfills very stringent requirements for operational reliability and is free of maintenance.

The EQN 1125 transmits the absolute position information over the fast serial, bidirectional EnDat interface. One revolution provides information on 8192 positions. The multiturn can also differentiate 4096 revolution. Because the decreasing dimensions of servomotors cause higher operating temperatures, the series of rotary encoders is designed for use in temperatures up to 115 degrees Celsius (239 degrees Farenheit).

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