From left to right: ERN 600, ERN 1100, ERN 400, ERN 1300, ERN 1000, ERN 100

HEIDENHAIN ERN rotary encoders have an integral bearing and a stator coupling. The shaft of the ERN is connected directly to the measured shaft. During angular acceleration of the shaft the stator coupling must absorb only that torque resulting from friction in the bearing. ERN rotary encoders therefore display a high dynamic performance and high natural frequencies.

Selection aid: ERN product family

Shaft	Series or model	Protection
Hollow shaft	Series ERN 100 Series ERN 400 Series ERN 600 Series ERN 1000	IP 64 IP 64 IP 40 IP 64
Stub shaft	Series ERN 1100	IP 40
Taper shaft	ERN 1381	IP 40