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RVDT Sensors AC/AC

AC-operated RVDT

Sentech RVDTs are suitable for most applications where angular measurements are required. The RVDT output is linearly proportional to the angular position of its shaft. It features non-contact type construction: a stationary coil and rotating sensing element on the shaft.

The shaft of the RVDT is supported at both ends by precision ball bearings (ABEC class 7), minimizing friction. Combined with its rugged construction, Sentech RVDTs offer high performance and reliability while withstanding the shock and vibration which occur in most industrial environments.

Mechanically capable of rotating continuously, it offers linear measurement up to ±70º. Within ±45º, linearity is better than ±0.5% of Full Scale.

There are two linear regions 180º apart. Factory calibrates one of the two regions and marks its corresponding null position. All Sentech RVDTs are magnetically shielded from outside influence and offer essentially infinite resolution only limited by signal conditioner.

The AC/AC RVDTs require an AC voltage excitation to the primary coil and produce an AC voltage, from their secondary coils which is proportional to shaft position. Sentech offers different diameter housing RVDTs from 0.81 ” to 1.5” dia. with either aluminum or stainless steel housings.


  • Intrinsic Safe units certified to UL, CSA and IECEX  scheme  and ATEX directive. (Class I, DIV 1, or Zones 0, 1 – ATEX Cat 1 protection for Gas Groups)
  • Non-incendive units certified to UL, CSA and IECEX scheme and ATEX directive. (Class I, DIV 2, or Zone 2 – ATEX Cat 3 protection for GAS groups)
  • Ingress Protection IP65
  • 3 wire Bridge Type configuration.
  • DC/DC units (see DC/DC data sheet)
  • Flying leads or Connector termination
  • 3, 4, 5 or 6 wire configurations
  • High Temperature versions
  • Matching signal conditioner available (both DIN package or NEMA 4 package).
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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
Learn more about our standards and certifications →

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.