OTG-MPK5 Fiber Optic Temperature Sensor

High Accuracy GaAs-Based Fiber Optic Temperature Sensor for Life Science Applications and Animal Physiological Temperature Monitoring.

OpSens’ OTG-MPK5 fiber optic temperature sensor offers the highest performances and robust packaging in the industry. The OTG-MPK5 sensor uses the well proven technique based on the temperature-dependent bandgap of GaAs crystal as the temperature transduction mechanism. Its small sensing GaAs crystal located at the tip of the optical fiber makes it convenient for tip measurement applications. The OTG-MPK5 temperature sensor is housed in a robust PEEK tube hence facilitates insertion and daily handling.

Combined with OpSens’ GaAs (SCBG) signal conditioning technology and with the inherent advantages of fiber optic, the OTG-MPK5 delivers unprecedented repeatability and reliability in the most adverse conditions such as high level of EM, RF, MR and microwave field environments.

The OTG-MPK5 is made with industry standard optical fiber and is compatible with all OpSens’ GaAs (SCBG) signal conditioners. This robust fiber optic temperature sensor is available with different optical cables and sheath options and is customizable according to customer specific applications or for OEM-type applications.


  • ± 0,3 °C total system accuracy
  • Small and robust design
  • Outstanding repeatability
  • MRI (<1.5T)/EMI/RFI and microwave immune
  • Intrinsically safe
  • OEM-type and custom disposable version


  • Surface and core temperature monitoring in MRI environments
  • RF, ultrasound and electro surgery environments
  • Temperature monitoring for preclinical and research applications
  • MR coil temperature monitoring

Ordering Information

Ref / Catalog Number Order Number (GTIN) Description
Temperature operating range20 °C to +45 °C (higher temperature ranges available upon request)
Resolution0.01 °C
Accuracy± 0.3 °C (Total accuracy over the full range from 20 to 45 °C including both signal conditioner and sensor errors)
± 0.8 °C and better (Total accuracy for higher temperature range including both signal conditioner and sensor errors)
Response time500 ms or better
Operating humidity range0-100 %
MRI/EMI/RFI susceptibilityComplete immunity (MR field <1.5T)
CalibrationNIST traceable
Cable length1.5 meters standard (other lengths available)
Optical connectorST standard
Sensor diameter0.510 mm O.D.
Cable sheathingTeflon™ (≥ 85 °C)
Signal conditioner compatibilityAll Opsens GaAs signal conditioners

All specifications are subject to change without prior notifications

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