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Hydraulic Cylinder Displacement Transducer System

HYDRASTAR is a non-contact, fast response, shock resistant displacement transducer designed for mounting inside hydraulic or pneumatic cylinders.

Designed to fit in applications where space is limited, its total length is only 2.6″ (6.3 cm) longer than the measurement length. This includes bulkhead mounting flange and nonlinear portion of the probe.

The core is mounted in a gun drilled hole in the piston and piston rod. As the core/piston moves over the transducer, a proportional voltage is generated by the signal processor.

Patented signal processing allows it to measure high-speed displacement with less error than magnetostrictive sensors.


  • Fast 35 µS response
  • ±0.15% linearity, (±0.10% optional)
  • Dynamic temperature compensation
  • Body length only 2.6” longer than stroke
  • Compact design
  • Absolute continuous measurement
  • Single coil wound with large gauge wire


  • Monitor high-speed motions
  • Accurate measurements
  • Stable over a wide temperature range
  • Measure high-speed displacement
  • Less sensitive to temperature extremes
  • Accurate position at power up
  • Better shock and vibration resistance


  • Hydraulic cylinders
  • Hydraulic valves
  • Pneumatic cylinders
  • Pneumatic valves
  • Material handling systems
  • Clevis cylinders
  • Liquid level measurement
  • Military applications
  • Aerospace flight controls
  • X-Y positioning feedback
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Sentech designs and manufactures with ISO 9001:2015, AS9100 Rev D certified quality management system. ANAB accredited.
Most Sentech products meet the following standards and/or certifications:
UL/CSA, ATEX, IECEX, TIIS (Japan), KOSHA / KCA (South Korea), Class 1 / Division 2 for harsh environments with flammable gasses or combustible dusts, IP54/IP65/IP66/IP67, RoHS - Reduction of Hazardous Substances, REACH - Restricted Chemicals List
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All Sentech Inc. products are warranted against defective materials and workmanship. This warranty applies for a period of one year from the date of delivery to the original purchaser. Any product that is found within the one year period not to meet these standards will be replaced or repaired at the discretion of Sentech Inc. No other warranty is expressed or implied. Although Sentech Inc. manufactures its products to exacting specification standards, we assume no responsibility for their misuse. Sentech Inc. accepts no liability for damages, incidental or punitive, in applications using our products. Please note: It is solely the user’s responsibility to properly install and maintain transducers. Sentech Inc. manufactures its products to meet stringent specifications and cannot assume responsibility for those consequences arising from their misuse or unauthorized modification. SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.