Angle Encoders Without Integral Bearing: ERO and ERA Modular Angle Encoders Modular angle encoders from HEIDENHAIN are suited for applications with the following requirements: Large hollow shaft inside diameter (up to 10 m with scale tape design) Rotational speed up to 40 000 rpm No additional starting torque from shaft sealing rings High accuracy (attainable through use of multiple scanning heads)

Selection aid: Modular Angle Encoders

Measuring standard		Model
Radial grating	On glass	ERO
Axial grating	On steel drum	ERA
	On steel strip	ERA