Micro-Epsilon draw wire sensors are available with a choice of potentiometric, conductive plastic, or encoder measuring elements; in full ranges from 50mm to 30m (30,000mm).
Sensors comprise a case enclosing a spring loaded drum, a pull wire with attachable clip, and a rotary sensor coupled to the wire drum. The rotary sensor itself is either potentiometric or a multi-turn encoder. Both incremental and absolute encoders are available in the Micro-Epsilon WDS range.
Options for synchros are also available. The choice of rotary sensor is usually dependant on the application, the required precision or accuracy, and the desired output signal.
As a general guide, an encoder is the optimum choice for long range applications. Lower cost potentiometric sensors generally suit short stroke applications.
Other factors including maximum inertia and repeated strokes over the same extension or section of the measurement range should be considered. As a further option, Micro-Epsilon draw wire sensors are available for customer supplied rotary measurement element.