1st July 2010
Precision in the measurement of linear motion
Wire & non-contacting transducers
Products from the Italian position measurement specialist FIAMA s.r.l. are now shown on the Techdrives website. FIAMA is known for digital and clock-type position indicators, but also offer wire operated transducers and non-contacting linear encoders. Combined with a matching display, these low voltage devices can give high resolution on strokes up to 12m. Wire transducers are lower in cost and flexible to use suiting linear speeds up to 500mm/s. Non-contacting position transducers are effectively encoders and both incremental and absolute versions are available.
Wire operated linear transducers 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 model. Options include a battery operated self-contained model, and pulse outputs for serial transmission by RS485 or PROFIBUS.
Where higher speeds and accuracy are needed, FIAMA offer a non-contacting system where 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.
FIAMA position measurement systems for linear motion are shown on the website
www.techdrives.co.uk
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