OTG-Q Fiber Optic Temperature Sensor

High accuracy SCBG-based fiber optic temperature sensor for microwave digestion, chemical processing with radio frequencies and assisted microwave energy.

Opsens Solutions’ OTG-Q fiber optic temperature sensor offers the highest performance in the industry. The OTG-Q model 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.

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

The standard operating range of the OTG-Q is from -40 °C to +250 °C. The OTG-Q is made with industry standard optical fiber and is compatible with all Opsens Solutions’ SCBG signal conditioners.

This welded design in 1.4mm OD PFA sheath option offers complete seal at the tip best suitable for all applications that involves liquid immersion.


  • Robust design
  • Welded tip design
  • Outstanding repeatability and good accuracy
  • EMI/RFI and microwave immune
  • Intrinsically safe
  • OEM-type and custom versions


  • EM, RF and microwave environments
  • High voltage environments
  • Nuclear & hazardous environments
  • Microwave assisted chemistry
  • Sterilization applications
  • In-situ process control
  • RF and microwave drying applications
Temperature operating and calibrated range

-40 °C to +250 °C (Other ranges available upon request)


± 0.8°C or better (Total accuracy over the full range including both signal conditioner and sensor errors)

Response time

1.0 s typical (For faster response time, see other OTG-series sensor)

Operating humidity range

0-100 %

EMI/RFI susceptibility

Complete immunity


NIST traceable

Cable length

1.5 meters standard (Other lengths available)

Optical connector

LCA, ST standard

Cable sheathing

PFA sheath 1.4mm O.D.

Signal conditioner compatibility

All Opsens Solutions’ SCBG signal conditioners

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

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