Draw Wire Encoders Measure Distances From .25 to 40 Meters

This system is designed to work with sensors and encoders with analog outputs—such as 0 to 10 Volt, 4 to 20mA and potentiometers—as well as incremental (push-pull and RS422), absolute (SSI and BISS) and fieldbus (CANopen®, PROFIBUS®, DeviceNet™ and EtherCAT®) interfaces.

At the core of a draw wire device is a drum mounted on bearings, onto which a wire is wound. The winding is performed using a constant force spring, which results in high traverse speed of up to 10 m/s and acceleration of up to 140 m/s. Draw wire encoders additionally offer a long service life of up to approximately 2 million complete cycles.

The robust draw wire system is constructed with a titanium-anodized aluminum housing and a stainless-steel wire with a diameter of 0.5 mm. The wire experiences no wear due to the device’s diamond-polished ceramic guide. Its wide operating temperature range of -20° to 85°C, as well as an optional IP67 protection rating, permit the system’s use in difficult environmental conditions.

Draw wire systems feature a linearity of up to 0.05 percent. TURCK can supply users with the relevant calibration certificate upon request.