LVDTsRVDTsFastar® SensorsHydraStar® SensorsSpecial Applications


Fast Response, Linear Displacement Transducer

FASTAR is a fast response, shock resistant, non-contact displacement transducer designed to measure linear displacement (position).

A precision variable inductor with a stroke to body length ratio of almost 1:1, FASTAR has a body length approximately half as long as typical LVDTs. Used with a Sentech patented signal processor, it allows high-speed displacement measuring with less error than other non-contact devices, with excellent immunity to EMI.

FASTAR consists of a movable core inside a coil-wound tube. As the core moves in or out, coil inductance changes. The processor generates a DC voltage proportional to the change in inductance.


  • Body length only 1.3” longer than stroke
  • Fast 35 µS response
  • ±0.15% linearity, (±0.10% optional)
  • Non-contact technology
  • Dynamic temperature compensation
  • Resistant to external fields (EMI)
  • Absolute continuous measurement
  • Single coil wound with large gauge wire


  • Eases installation where space is limited
  • Monitor high speed motions
  • Accurate measurements
  • No friction — long life, no hysteresis
  • Stable over a wide temperature range
  • No shielding required
  • Accurate position at power up
  • Better shock and vibration resistance than LVDT's


  • Cylinder feedback
  • Roll position / Gap monitoring
  • Automated production gauging
  • Vibration analysis
  • Robotic motion control
  • X-Y positioning feedback
  • Material handling systems
  • Material testing equipment
  • Injection molding machines
  • Hydraulic presses
  • Liquid level measurement
  • Valve monitoring
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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.