OpSens’ OTG-M series (OTG-M170, OTG-M220, OTG-M360, OTG-M420, OTG-M600, OTG-MPK5, and OTG-MPK8) fiber optic temperature sensors deliver outstanding performance. These sensors use a tried-and-tested temperature transduction mechanism based on the temperature-dependent bandgap of GaAs crystal.
Due to the tiny sensor GaAs crystal situated at the optical fiber’s tip, it is suitable for tip measurement applications. Each variant of the OTG-M series has its own reaction time and sensor diameter (OD).
With the inherent advantages of fiber optic sensing, the OTG-M delivers unrivaled repeatability and dependability, even in the harshest of environments such as EM, RF, MR, and microwave field settings.
The OTG-M Series is built with industry-standard optical fiber and is compatible with all OpSens SCBG signal conditioners. This tiny and durable fiber optic temperature sensor is available with a number of optical cables and sheath choices and may be adapted for OEM or customer-specific applications.
Key features
- Accurate
- Convenient and durable design
- Excellent consistency
- OEM and customized versions
- Internally secure
- Immunity to EMI/RFI/RFI and microwave
Applications
- Temperature monitoring in real time
- An inexpensive disposable sensor
- Applications requiring small-size sensors
- Environments such as EM, RF, and microwave
- Extremely high voltage environments
OTG-M series
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 GaAs (SCBG) signal conditioners |