LIOS PRE.VENT Industrial Strain Measurement System

Monitor large processing plants, reactors, storage tanks, gasifiers and many other large industrial assets with our reliable and easy-to-install LIOS PRE.VENT even at remote locations. Operators can monitor many thousands of temperature measurement points of the asset, optimize operation and detect hazardous situations even in early stages.

Through fiber optic sensor technology and a very simple form of setup the LIOS PRE.VENT offers excellent distance range and measurement performance even in the largest and most complex structures.
The maintenance free industrial design operates in temperatures from -10 to 60°C. With a very low energy consumption and network integration possibilities, the monitoring equipment can easily be installed in the most remote locations; ideal to monitor very long infrastructure as rail tracks, offshore assets, pipelines, dykes & dams, bridges, etc.

The LIOS PRE.VENT system is a series of controllers for distributed structure monitoring (DSM) that is based on a proprietary Brillouin measurement technology. Its major advantages are the excellent distance range and measurement performance. It exhibits a superior strain
and temperature resolution and accuracy in comparison to other technologies. The excellent performance is achieved in both, single- and double-ended fibre configurations. The DSM series is designed for autonomous operation without PC and comprises an internal SSD (solid state  drive) for an independent and continuous storage of measurement and event data.
The DSM series is fully integrated with the Charon4 software suite for easy configuration, long term data storage, and enhanced visualization. Data from LIOS PRE.VENT controllers and other sensors are easily combined in the database to enable an efficient monitoring of complex power cable installations using various sensing systems with different distance range and/or measurands.


  • Broad portfolio of industry assets can be measured
  • Permanent monitoring of thousands of measurements points
  • Easy fitting of sensor cable to large structures
  • Superior hotspot and strain  detection

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Distance Ranges of LIOS PRE.VENT models

PRE.VENT -050, -100, -200, -300, -400, -500 5 km, 10 km, 20 km, 30 km, 40 km, 50 km

Data Storage/Communication/Interfaces

Communication Interfaces 2x Ethernet TCP/IP, USB, (optional: WLAN, GSM)
Communication Protocols (options) XML, MODBUS, DNP3, IEC60870, IEC61850
I/O Board (optional*) 4 inputs / 12 outputs
Analogue Sensors Interface Board (optional*) 4x Pt100, 2x 0(4)-20mA and 2x 0-10V

*2 optional internal boards can be installed in total

Electrical Data

Power Consumption, max. (DC / AC options) 40 W / 45 W
Operating Voltage (DC-1 option) 12 … 24 V DC (-15%/+10%)
Operating Voltage (DC-2 option) 24 … 48 V DC (-15%/+10%)
Mains Voltage (AC option) 100 … 240 V AC 50..60 Hz / 110… 220 V DC (-15%/+10%)

Environmental Data

Explosion safety (option)* EX II (1) G [Ex op is T4 Ga] IIC / II (1) D [Ex op is Da] IIIC / I (M1)
[Ex op is Ma] I

*Qualification in process

Optical data

Optical Channels (internal) 1, 2, 3, 4, 6, 8, 9, 12 or 16
Fiber Configuration No loop or termination required
Optical Connector(s) E2000/APC
Fiber Types Single-mode 9/125, e.g. ITU-T G.652, G.655 or G.657
Laser classification Class 1M (IEC60825-1), eye-safe wavelength

Measurement Performance*

Sampling Interval 0.25, 0.5 or 1 m
Spatial Resolution 1, 2, 3 or 5 m
Temperature Resolution @ 10dB Optical Loss < 1°C
Strain Resolution, minimum < 2 με
Strain Resolution @ 10dB Optical Loss < 20 με
Temperature Accuracy 2°C**
Measurement Time 1 to 20 min

*Measurement performance parameters are interdependent
**After calibration on a loose fiber without strain

Data Storage/Communication/Interfaces

Internal SSD Storage 8, 16, 32 or 64 GB
Programmable Inputs/Outputs 4/10
Fixed Outputs Collective fault and alarm

Mechanical Data

Rack Space 19-inch rack, 3 height units
Dimensions (HxWxD) 13.3 x 43.9 x 40.3 cm
Weight 15 kg

Environmental Conditions

Storage Temperature -40°C to +85°C
Operating Temperature -10°C to +60°C
Humidity (relative) ≤95 % (non-condensing)
Protection Class (IEC 60529) IP51

Conformity to Standards

Electrical Safety IEC/UL 61010-1, LV directive 2014/35/EC, CAN/CSA-C22.2
EMC* EN61326-1, EN61000-6-2,3,-4-2,3,4,5,6,8,11,-3-2,3, FCC 47 CFR Ch.1 Part15
Hazardous Substances, waste RoHS directive 2011/65/EC, WEEE directive 2002/96/EC
Environmental testing* IEC 60068-2-6,14,27,30
Functional safety (IEC61508)* Hardware design compliant to Safety Integrity Level SIL2

*Qualification in process