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Robust Accurate Dielectric
TSENS Fiber Optic Temperature Sensor Product

Key Features

  • Optimized for easy installation in oil-filled and dry-type transformers and reactors
  • Rugged and robust construction built to outlast your transformer life
  • Outstanding repeatability, zero-drift GaAs technology
  • 9 mm disc design, suitable for all locations in a transformer (windings, cores, busbars, tap changers, etc.)
  • Solvent and chemical resistant

Product Description

TSENS Fiber Optic Temperature Sensor Summary


Highly reliable and flexible sensors for hot spot monitoring of transformer and motor windings. The sensor tip is protected by the rugged torlon disc so that sensors can be installed easily in between two winding coils. The sensors are highly robust and passed the pull test of 60N force. 

The TSENS sensors are highly dielectric and exhibit less than 2pC partial discharge under extra high voltage. This ensures highest safety to the transformer. The sensors are highly accurate and designed for continuous temperature monitoring for longer time.

TSENS Benefits
    • Sensors does not require any recalibration
    • Designed to exceed transformer life
    • Very low PD performance
    • Surpass ASTM D2413 and D149 standards
    • Available wth disc and without disc
    • PTFE Teflon spiral-wrap reinforcement
    • No shift over time, high stability
    • Robust fiber optic temperature sensor tip
TSENS Fiber Optic Temperature Sensor Applications
    • Power transformers, Oil-filled and Dry-type transformer
    • Compatible with all Rugged Monitoring instruments
    • Compatible with all types of transformer oil, including ester type
    • Withstands kerosene desorption
    • Mounts in standard radial spacers
    • Suitable for HVDC windings
    • High voltage environments (1 MV, or more)
    • Ideal for direct measurements of temperature

Detailed Overview

The Rugged Monitoring Tsens probes have been designed and built so they can be incorporated in your transformers to give precise results (direct measurements of temperature). The sensing technology is based on the proven zero-drift GaAs technology. They are completely built using first quality materials, all with very high dielectric strength, so your transformers can benefit from accurate temperature readings, which is essential to a good knowledge of transformer aging rate. During a factory heatrun tests these probes will give to both transformer manufacturer and operator invaluable information regarding the transformer expected MVA performance. The patented tip construction makes them extremely robust, while being very easy to install in radial spacers or in other pressboard material (such as for temperature measurements in yokes or other transformer components). The spiral-wrap cable is especially constructed to allow complete oil penetration so you can be assured that no air can be present. All materials used in the probe construction are compatible with high temperature kerosene desoprtion processes.

Technical Specifications

Temperature range-200 °C to +250 °C
Repeatability0.2 °C
Accuracy absolute temperature+/- 0.8 °C
Accuracy relative temperature+/- 0.2 °C
Probe sheathing materialTeflon spiral-wrap
Tip materialTorlon (with disc) or Polyimide (no disc)
ConnectorStainless Alloy ST / Optional - Dielectric Torlon
Probe lengthUp to 25 meters
Response timeUp to 0.2 sec without disc. About 2 sec with disc
LongevityProbe accuracy and repeatability constant over time

Ordering Code

TSENS Fiber Optic Temperature Sensor Ordering Code

Product Drawing

TSENS Fiber Optic Temperature Sensor Product Drawing