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Absolute Displacement Transducers


Displacement Transducers are used to track the movement of
cylinders in hydraulically operated rolling mills, and in other
applications where it is advantageous to measure displacement
with an accuracy in the micron range.

Typical displacement sensors are incremental measurement devices; that is, they must be zeroed before
operation and then report changes from the zero position. Such devices are highly accurate but susceptible to
loss of reference due to shock or electrical interference. Moreover they must be packaged to survive the rolling
mill environment while maintaining an extremely high level of precision measurement.

The KELK Absolute Displacement Transducer (ADT) is an absolute measuring device using magnetostrictive
measurement technology to track cylinder and other movement to micron levels of accuracy without the need
for pre-zeroing and with no danger of losing reference due to shock.

With packaging by KELK the user is assured of highest accuracy measurement, together with long sensor life
and minimum maintenance.

KELK offers two basic Absolute Displacement Transducer (ADT) models for use in tracking the
movement of hydraulic cylinders:

  • an external version with a pressurized enclosure designed to be used in pairs outside each
  • an internal version designed to fit inside each cylinder