OTP-P Fiber Optic Temperature Sensor

WLPI based fiber optic temperature sensor for demanding applications and rough handling usage

Opsens Solutions’ OTP-P fiber optic temperature sensor offers the highest performances in the industry. The OTP-P sensor uses the temperature-dependent birefringence of specially selected crystal as the temperature transduction mechanism. Because of the pure monocrystalline material used, the OTP-P does not shows thermal creeping or aging as with other fiber optic sensors based on the thermal dilatation of glass optical fibers

Combined with Opsens Solutions’ WLPI signal conditioning technology (patent # 7, 259, 862) and with the inherent advantages of fiber optics, the OTP-P delivers unprecedented repeatability and reliability in the most adverse conditions such as high level of EM, RF, MR and microwave fields environments as well as with high voltage and rapid temperature cycling conditions.

The standard operating range of the OTP-P is from -40 °C to +250 °C.

The OTP-P is compatible with all Opsens Solutions’ WLPI signal conditioners. This robust fiber optic temperature sensor, available in different cables and sheath options, is customizable according to customer specific applications or for OEM-type applications.


  • Robust design
  • Good accuracy
  • Outstanding repeatability
  • Low drift and low hysteresis
  • EMI/RFI and microwave immune
  • Intrinsically safe


  • EM, RF and microwave environments
  • High voltage environments
  • Nuclear and hazardous environments
  • Sterilization applications
  • In-situ process control
  • RF and microwave drying applications
  • Civil engineering and geotechnical applications
Temperature operating and calibrated range

-40 °C to +250 °C


± 1.0 °C @ ± 3.3 sigma limit (99.9% confidence level)

Operating humidity range

0-100 %

EMI/RFI susceptibility

Complete immunity


NIST traceable

Cable length

1.5 meters standard (Other lengths available)

Optical connector

SC standard

Cable sheathing

Operating temperature range dependant (Contact factory)

Thermowell material

Stainless steel (Ceramic or other materials available as option)

Signal conditioner compatibility

All Opsens Solutions’ WLPI signal conditioners

Opsens Solutions Inc. reserves the right to make any changes to the above specifications without prior notice.

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