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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 22
Manual - Lufft - IRS31Pro - UMB (EN)
Manual - Lufft - SmartView3 (EN)
Manual - Lufft UMB Config Tool (EN)
Manual - Lufft UMB Protocol (EN)
Software - UMB Config Tool
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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General
Dimensions Ø 120mm, height 50mm
Detectable road conditions Dry/moist/wet/moist with salt/wet with salt/ice
Weight Approx. 800 g without cable and without external temperature probe
Storage temperature -40...70°C (in packaging)
Rated current <200mA
Interface RS485, Baudrate: 2400 ... 38400 bit/s (Standard: 19200) or SDI-12
Protection type IP68
Power supply 9...14VDC, nominal 12V
Connector Cable 0.5mm²
Operating temperature -40...80°C
Operating rel. humidity 0...100% RH
Road dampness Unit: dry/damp/wet/damp with salt/wet with salt
Slippery road conditions Unit: no ice/snow, snow, ice
Road surface temperature & below ground temp.
Principle NTC
Measuring range -40 ... 80 °C
Unit °C
Accuracy ±0.1°C (-20 ... 20°C), else ±0.2°C
Resolution 0.1
Freezing point
Measuring range -40 ... 0 °C
Unit °C
Accuracy ±0.5°C (0 ... -2.5°C), else ±20% of average value (at de-icing agent NaCI)
Resolution 0.1
Water film height
Principle Radar
Measuring range 0 ... 4 mm
Unit mm
Accuracy 0.2mm to 3mm: better than +/-30%
Resolution 0.01 mm
Friction (Grip) [slippery...dry]
Measuring range 0 ... 1
Ice Percentage
Measuring range 0 ... 100 %
Unit %
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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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