Linear transducers handle harsh environments
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Variohm Eurosensor product story
Edited by the Engineeringtalk editorial team
Jun 13, 2006
Linear position transducers offer a wide range of output interfaces coupled with high speed operation, durability and stroke lengths up to 4500mm.
The new TLM and TMI linear position transducers from Variohm-Eurosensor offer a wide range of output interfaces coupled with high speed operation, durability and stroke lengths of up to 4500mm.
This combination makes them ideal for use in harsh environments such as high temperatures, high humidity and constant vibration, factors which normally pose a problem for more traditional units.
Unlike conventional position transducers, the TLM and TMI employ a magnetostrictive technology which uses a magnet as a target.
Normally the transducer body is fixed to a machine bed or body and the magnetic target to a moving part the position of which is to be measured.
One great advantage of this system is that the magnet doesn't need to be aligned very precisely - +/-2mm will not affect accuracy.
This technology also affords the possibility of sealing to IP67.
Magnetostriction is an absolute measuring system so that the transducer always knows where it is even after power is removed and restored.
Offering stroke lengths of between 100 and 4500mm, the TLM and TMI are of a robust design and will operate over the temperature range from -40 to +85C.
Measurement accuracy is not affected by the surrounding atmosphere or medium and they ideally suited for integration into hydraulic cylinders.
Resolution is 0.001mm, irrespective of the stroke length.
Particular attention was paid to the integrity of the output data and this led to the development of a special ASIC which verifies the validity of the measured value but also corrects it for linearity errors.
The data transfer rate is 16kHz and the output is available as either start/stop, SSI or DyMos, this latter format also provides an output corresponding to the true operational speed at which the unit is being operated.
The latest variation also offers the possibility of direct connection to CANopen.
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Contact Variohm Eurosensor
Tel +44 1327 351004
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