OpSens’ OTG-M Series fiber optic temperature sensors (OTG-M170, OTG-M220, OTG-M360, OTG-M420, OTG-M600, OTG-MPK5, OTG-MPK8) provide outstanding performance in demanding and microscale environments.
The temperature transduction process of the OTG-M Series sensors uses a well-established technique, which is based on the temperature-dependent bandgap of the GaAs crystal. Thanks to the tiny sensor GaAs crystal that is glued at the tip of the optical fiber, it is suited for tip measurement applications.
The reaction time, material choices, and sensor diameter (OD) are what distinguish each model in the OTG-M series.
The OTG-M Series delivers outstanding repeatability and dependability in the majority of unfavorable situations, such as high levels of EM, MR, RF, and microwave field environments. It is integrated with OpSens SCBG (Semiconductor Bandgap) signal conditioning technology and with the typical advantages of fiber optic.
The OpSens OTG-M Series uses industry-standard optical fiber and is compatible with all OpSens SCBG signal conditioners. This robust and small fiber-optic temperature sensor is available with a variety of optical cables and sheath options, and it may also be adapted for OEM-type or customer-specific applications.
Key features
- RFI/RFI/EMI and microwave immune
- Compact and strong design
- Intrinsically safe
- Superb precision
- Custom and OEM-style version
- Repeatability is outstanding
Applications
- Low cost disposable sensor
- Dynamic temperature monitoring
- RF, EM, and microwave surroundings
- Applications that need small-size sensors
- High voltage environments
Fiber optic temperature sensor

Image Credit: OpSens Medical
Specifications
Source: OpSens Medical
SENSOR MODEL |
OTG-M170 |
OTG-M220 |
OTG-M360 |
OTG-M420 |
OTG-M600 |
OTG-MPK5 |
OTG-MPK8 |
RESPONSE TIME |
≤ 35 ms |
≤ 50 ms |
< 100 ms |
< 200 ms |
200 ms |
< 225 ms |
< 500 ms |
SENSOR DIAMETER |
0.170 mm |
0.220 mm |
0.360 mm |
0.420 mm |
0.600 mm |
0.510 mm |
0.810 mm |
SENSOR TIP MATERIAL (TUBE) |
Bare fiber |
Polyimide |
Glass |
Polyimide |
Polyimide |
PEEK |
PEEK |
TEMPERATURE OPERATING AND CALIBRATED RANGE |
-40 °C to +250 °C (other ranges available upon request) |
ACCURACY |
± 0.8 °C or better for other temperature range |
OPERATING HUMIDITY RANGE |
0-100 % |
EMI/RFI SUSCEPTIBILITY |
Complete immunity |
CALIBRATION |
NIST traceable |
CABLE LENGTH |
1.5 meters standard (other lengths available) |
OPTICAL CONNECTOR |
LCA, ST, standard |
CABLE SHEATHING |
Teflon™ |
SIGNAL CONDITIONER COMPATIBILITY |
All Opsens Solutions’ GaAs (SCBG) signal conditioners |