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Intelligent Passive Road Sensor IRS31Pro-UMB

The passive road sensor IRS31Pro-UMB convinces by its two part housing design and accurate detection of road surface temperature, water film height, freezing temperature, ice percentage and many more...

The passive road sensor IRS31Pro-UMB is flush-mounted in the road. The two part housing design allows the combined sensor/electronics unit to be removed for maintenance or calibration at any time. The following variables are recorded: Road surface temperature, water film height up to 4 mm, freezing temperature for different de-icing materials (NaCl, MgCl, CaCl), road condition (dry/damp/wet/ice or snow, damp with salt, wet with salt), friction (Grip), ice percentage. Optional: 2 additional depth temperatures, e.g. at 5 cm and 30 cm. The measurement data is available for further processing in the form of a standard protocol (Lufft UMB protocol).

  • Road surface temperature, water film height up to 4mm, freezing temperature for different de-icing materials (NaCl, MgCl, CaCl), road condition (dry/damp/wet/ice or snow/moist with salt/wet with salt), friction, ice Percentage, 2 additional depth sensors
  • Conductivity measurement (ice percentage), radar measurement (water film), NTC (road surface temp.)
  • Two part housing design allows easy maintenance/re-calibration, low energy consumption allows solar operation, radar principle to measure water film
  • RS485, SDI-12, analogue outputs
  • 8910.U050, 8910.U051, 8910.U052, 8910.U100, 8910.U101, 8910.U102
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  • Freezing temperature output already from pre-set dry-damp threshold (e.g. 10µm according to new TLS specification).
  • Replaceable sensor electronics (for easy calibration or maintenance)
  • Polling via RS485 interface
  • Low energy consumption (solar operation)
  • Radar principle to measure water film
  • Analogue outputs in combination with a converter (DACON - 8160.UDAC)
  • For winter maintenance operators as part of road weather stations on roads, motorways, highways (municipalities, federal states and provinces)
  • For smart cities
  • For airports, installed on runway as important part of the IDS (ice detection system) and water film height detection (aqua-planning risk)

Product variants - Passive Road Sensor IRS31Pro

The Passive Road Sensor IRS31Pro is available in different product variants. We offer a cable length of 50 as well as 100m. In addition you can choose if you need one, two or no depth sensor.

  • IRS31Pro with cable length 50m and no depth sensor (Article no. 8910.U050)
  • IRS31Pro with cable length 50m and one depth sensor (Article no. 8910.U051)
  • IRS31Pro with cable length 50m and two depth sensors (Article no. 8910.U052)
  • IRS31Pro with cable length 100m and no depth sensor (Article no. 8910.U100)
  • IRS31Pro with cable length 100m and one depth sensor (Article no. 8910.U101)
  • IRS31Pro with cable length 100m and two depth sensors (Article no. 8910.U102)
Brochure - Lufft - Weather Critical Operations (EN)
Traffic weather, renewable energies and more
EU declaration of conformity - Lufft IRS31Pro
EU declaration of conformity - Lufft IRS31Pro
Firmware - Lufft - IRS31Pro-UMB
Version 2.4
Manual - Lufft - IRS31Pro - UMB (EN)
V9
Manual - Lufft - SmartView3 (EN)
Manual - Lufft UMB Config Tool (EN)
Manual - Lufft UMB Protocol (EN)
Software - UMB Config Tool
Whitepaper - Road Weather Selection Guide
The Whole World of Road Weather Monitoring
Video - IRS31: Calibration of the Road Sensor IRS31 - UMB
Video - IRS31Pro/ARS31Pro: Installation of Lufft Road Sensors IRS31Pro and ARS31
Video - IRS31Pro: Technical Webinar - Road sensor IRS31Pro - UMB
Video - ViewMondo Tutorial: The Management Software for Road Weather Stations
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Measuring parameters
Road Conditions Dry/moist/wet/moist with salt/wet with salt/ice, snow, frost
Sampling rate 10 … 60 sec
Road surface temperature & below ground temp.
Principle NTC
Measuring range -40 ... 80 °C
Accuracy ±0.1°C (-20 ... 20°C), otherwise ±0.2°C
Resolution 0.02°C (-20…+20), otherwise 0.1
Freezing point
Measuring range -40 ... 0 °C
Accuracy ±0.5 °C (0 ... -2.5 °C), else ±20% of average value (with de-icing agent NaCI)
Resolution 0.1
Water film height
Principle Radar
Measuring range 0 ... 4000 µm
Accuracy 200 µm <3 mm, otherwise +/-30%
Resolution 10 µm
Friction (Grip)
Measuring range [slippery...dry] 0 ... 1
Ice Percentage
Measuring range 0 ... 100 %
Resolution 0,10%
Communication
Standard interfaces (out) RS485 or SDI-12, 2 wire , half dublex
Baud rates 1200, 2400, 9600, 19200, 38400
Communication Protocols UMB, SDI-12
Connector cable wires 0.5 mm²
Electrical parameters
Power supply 9-14 VDC, nominal 12V
Power consumption (typ.)
Protection class III (SELV)
Operating Conditions
Operating temperature -40 … 80 °C
Ambient storage temperature -40 … 70 °C
Relative humidity (ambient) 0 … 100 %
Relative humidity storage 0 … 95 % (non-condensing)
Operating altitude -500 … +3000 m
Safety and compliance
Protection level housing IP68
Electrical Safety EN 61010-1:2011-07
Electromagnetic Conformity IEC 61326 – 1:2012
Certifications CE, FCC
Surface condition standard EN 15518-3:2011 tests carried out regarding CEN/TS 15518-4:2013
Physical
Dimensions Ø 120mm, height 50mm
Weight Approx. 800 g without cable and without external temperature probe
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IRS31Pro/ARS31Pro: How to install a Lufft Road Sensor?

In this Training Video, our service technician Jim Latimer explains, how to install Lufft Road Sensors.

To the Training Video: Installation of Lufft Road Sensors

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