Fiber Optic Temperature Measurement

The SITRANS TO500 multipoint measuring system is used for evaluating a large number of temperature measuring sensors arranged on a very narrow fiber-optic measuring lance. The system consists of the following components: a read-out unit, the transmitter, and the measuring lance,. With up to four measuring probes, 192 measuring points can be processed at the same time. The system is particularly suitable for applications in constrained spaces with a low thermal mass, i.e.  in tube and tube bundle reactors or in capillary or microreactors. 

Catalog Specifications

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  • Make the most of the available space - Small diameter of the measuring lance enables fast response times for dynamic process monitoring 
  • Gap-free - With a total of 192 measuring points temperatures are accurately detected and used for further process optimization
  • Simple installation - Lance is delivered coiled on a capstan and can hence easily be inserted into the protective tube 
  • Flexible and customer-specific - Positioning of the FBGs according to your individual needs
  • Lean solution - No additional cabling required as the transfer of the measured values is handled via the measuring probe
  • Versatile - Suitable for high process temperatures as well cryogenic applications (depending on type of lance)


FBG (fiber Bragg grating) temperature measuring probes
Measured variable
Input type
Characteristic curves
Measuring accuracy
Measuring cycle
Measuring range
4 channels
FBG sensors (max. 48 per channel)
0.1 K
< 0.5 K
< 0.5 K
< 1 s
-180°C to +400°C, depending on measuring probe type
Output signal
Power supply
Measuring speed
Measuring rate
Optical Power
Laser protection class
24 V DC ± 20%
Against reverse polarity

1 Hz, independent of the number of FBGs
≤ 1 mW per channel
Class 1
Operating conditions
Ambient temperature
Storage temperature
Relative humidity
Electromagnetic compatibility

0 to +50°C
-40 to +85°C
< 80%, non condensing at 50°C
According to EN 61326





DIN rail adapter


2.4 kg
250 x 140 x 110 mm
At the back
Displays and buttons

"Power-on" (continuous light) 
"Status" (flashing during startup; otherwise continuous light)
"Reset" (system restart or address reset)

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Controlling your process every step of the way with SITRANS T

The most widely used measurement in many diverse industries, accurate and reliable temperature monitoring is critical to your processes. Take advantage of Siemens wide range of devices for temperature measurement and you will find both significant savings and improvements to your operations.

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