FIAMA position sensors now available from Techdrives

Wire-operated linear transducers (also known as draw wire displacement sensors) are simply devices that turn linear motion into a variation in resistance of a potentiometer. The cable housing with spring retraction of the cable is mounted in a fixed position with a low-voltage DC supply and gives outputs of 4-20mA or 0-10V. The cable can be supplied in standard lengths starting at 50mm stroke and running up to 12.2m. Operating speeds are limited to 500mm/s but accuracy is good, with repeatability at about 0.2mm depending on the model. Options include a battery-powered, self-contained model, and pulse outputs for serial transmission by RS485 or Profibus.

Where higher speeds and accuracy are needed, FIAMA offers a non-contacting system in which a magnetised plastic ferrite strip is sensed by a DC-powered transducer. Linear speeds up to 3m/s are possible. This is effectively an incremental encoder system with push-pull or TTL line-driver outputs in two channels. The magnetised strip can be supplied for measuring lengths up to 25m with a position measurement accuracy of 0.1mm. A further option is an absolute encoding system available up to 10m.

Follow the link for more information about FIAMA position measurement systems for linear motion.