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
- 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)
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EU declaration of conformity - Lufft IRS31Pro
EU declaration of conformity - Lufft IRS31Pro
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Whitepaper - Road Weather Selection Guide
The Whole World of Road Weather Monitoring
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Download as PDF
Download as PDF
| 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 |
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.
