Draw Wire Encoders Measure Distances From .25 to 40 Meters

Nov. 10, 2009
Kübler by TURCK has expanded its draw wire series with versions that measure distances ranging from 0.25 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.

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