Distributed Temperature Sensing (DTS) Systems

Distributed temperature sensing (DTS) systems are optoelectronic devices which measure temperatures by means of optical fibres functioning as linear sensors. Temperatures are recorded along the optical sensor cable, thus not at points, but as a continuous profile. A high accuracy of temperature determination is accomplished over great distances. Generally, the DTS systems can locate the temperature to a spatial resolution of 1 m with accuracy to within ±1°C at a resolution of 0.01°C. Measurement distances of greater than 30 km can be monitored and some specialised systems can provide even tighter spatial resolutions.

Distributed temperature system provides continuous underground power lines monitoring of temperatures, detecting hot spots, delivering operational status, condition assessment and power circuit rating data. This helps operators to optimize the transmission and distribution networks, and reduce cost of operation and capital.

As you can see on the following figure, laser pulse is transmitted through the fiber optic cable from one side. As soon as the pulse transposes the fiber, it causes backward scattering depending on local temperature. Based on the intensity of backward scattering we can perform temperature measurement. In order to determine the distance we calculate the time required for backward scattering to come back. Therefore, the optical fiber cable operates like the sensor. It means that the fiber optic installation and maintenance are not complicated.

The fiber optic system allows making temperature measurement under the clad layer of the cable line. Trinius software monitoring system on a real-time basis evaluates the conduct cable temperature measurement. Consequently, it can be used to control operating temperature phases of cable and can help to prevent load-burst. This is very important to establish the additional capacity of the technical transmission over the cable line on time. Trinius software provides expanded short-term ratings for buried cable, among which stable load condition and short-time overload, that circuits can take without any damages.

Trinius Distributed Temperature Sensing can help power companies to improve their distributing mains and optimize transmission loads. It provides information about required investments in infrastructure


Distributed temperature sensing can be deployed successfully in multiple industrial segments:

  • Temperature monitoring of Transmission & Distribution power lines
  • Oil & gas wells and reservoirs monitoring
  • Fire detection in tunnels, industrial conveyor belts and special hazard buildings
  • Temperature monitoring and control in mines
  • Research & Development

Trinius diagnostic possibilities in power lines monitoring


On-line monitoring of fiber optic cable line with temperature sensors enable attending personnel to operate the line in an efficient manner:

  1. Using Raman Effect method provides the opportunity for rapid response to thermal changes of cable at the long distance, up to 8 km. Our devices can be connected in circuits in order to monitor large areas and several objects at the same time.
  2. Trinius system helps to calculate potential additional load on the cable line (dynamic loading).
  3. With our Trinius system utility companies can avoid blackouts and reduce their cost-to-serve of the electric energy system.
  4. Trinius Distributed Temperature Sensing can detect the location of cable line interruption (if fiber optic cable is incorporated in power cable line).

The following graph shows that awareness of a thermal overload allows optimizing the load. Also it is important to take into account actual conditions at all parts of the cable line.

Main technical parameters:

Trinius 520 Trinius 540 Trinius 560 Trinius 580
Measurement range -330 to +570°F (-200 to +300°С)
Spatial accuracy 13 ft (4 m) 6.5 ft (2 m) 3.3 ft (1 m) 13 ft (4 m)
Temperature accuracy 2.5°F (1.5°С) 1.6°F (1.0°С)
Line measuring time, sec. from 10
Spatial resolution 6.5 ft (2 m) 3.3 ft (1 m) 1.6 ft (0.5 m) 6.5 ft (2 m)
Sensing element length Up to 5 mi (8 km) Up to 11 mi (17.6 km)
Wavelength, nm/fiber type 1,550/MMF, 50/125 or 62.5/125
Usage conditions +15 to +130 °F ( -10 to +55°С)
Number of active channels 1 1 to 16
Device dimensions 19.7 x 17.5 x 5.3 in (482 x 450 x 134 mm)
Weight 26.5 lbs (12 kg)
Power consumption, W 200
Humidity, % 0 to 90, non-condensing

Trinius systems features

  • Trinius open interface (Modbus over RS232, TCP) permits easy integration to SCADA/EMS systems
  • Trinius has Plug & Play connection capabilities
  • Trinius safe semiconductor 1M class laser enables inherently safe operation with maximum lifespan, widest operating temperature range and lowest power consumption
  • Optromix specialists are ready to help you with the design, installation, testing, commissioning and project management
  • 2-years warranty
  • Optromix provides staff training, constant support and maintenance
  • Maintenance costs are minimal. No regular recalibration is required

The advantages of working with Optromix:

  • Trinius has the superior quality, however its price is one of the lowest in the market
  • Optromix is ready to develop DTS systems based on customer’s specifications

If you would like to purchase DTS (Distributed Temperature System), please contact us: or +1 617 558 98 58

We want to make your work easy!