Lufft Intelligent Road Sensor IRS31Pro-UMB
Product Number: 8910.U051The IRS31Pro‑UMB passive road sensor delivers precise road condition, ice, grip, and surface temperature data, enabling reliable winter road monitoring with easy maintenance and standard UMB data output.
Number of Depth Sensors
Cable Length
Overview
The passive intelligent 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 are available for further processing in the form of a standard protocol (Lufft UMB protocol).
Benefits
Invasive sensors embedded in the road allows all time measurements of water film height, road surface and depth temperature and road condition even at heavy traffic conditions.
Sensor consists of two parts: replaceable sensor head with electronics and fixed mounted socket.
Low energy consumption allows solar operation.
Permanent usage on runways where non-invasive sensors cannot be used.
Specifications
Technical Attributes
| Slippery road conditions | Unit: no ice/snow, snow, ice |
| Interface | RS485 Baud rate: 2400 - 38400 bit/s (Standard: 19200) or SDI-12 |
| Number of Depth Temperature Sensors | 1 |
| Cable Connection | Open wires 0.5 mm² |
| Road dampness | Unit: dry/damp/wet/damp with salt/wet with salt |
| Height above Absolute Altitude | 9843 ft (3000 m) |
| Accuracy | Road surface temperature: ±0.2 °F (-4 - +68 °F), else ±0.4 °F Freezing point: ±1 °F (32 - +27.5 °F), else ±20 % of average value (at de-icing agent NaCI) Water film height: 0.2 mm - 3 mm: better than ±30 % |
| Number of Depth Sensors | 1 |
| Resolution EU | Road surface temperature - 0.1 Freezing point - 0.1 Water film height - 0.01 mm |
| Dimensions (free text) | Ø 4.72441 in, H 1.97 in (Ø 120 mm, H 50 mm) |
| Measurement technology | Ice percentage: Conductivity measurement Water film: Radar measurement Road surface temperature: NTC |
| Product highlights | Two part housing design allows easy maintenance/re-calibration Low energy consumption allows solar operation Radar principle to measure water film |
| Detectable road conditions | Dry/moist/wet/moist with salt/wet with salt/ice |
| Measurement Range EU | Road surface temperature: -40 - +176 °F Freezing point: -40 - +32 °F Water film height: 0 - 0.16 in Friction (Grip) [slippery-dry]: 0 - 1 Ice Percentage: 0 - 100 % |
| Power supply | 9 - 14 VDC, nominal 12 V |
| Cooling Sensor | N.A. |
| Parameters Measured | 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/moist with salt/wet with salt Friction Ice Percentage Depth: 2 additional depth sensors |
| Connector (text) | Cable 0,5 mm² |
| Operating temp range 1 | -40 - +176 °F |
| Weight EU | Approx. 1.8 lb (800 g) without cable and without external temperature probe |
| Measurement distance | in-situ |
| Communication | SDI-12, RS485-UMB |
| Operating humidity | 0 - 100 % RH |
| Casing IP Rating | IP68 |
| Standard storage temperature | -40 - +158 °F (in packaging) |
| Material enclosures | Salt , UV resistant modified PTFE |
| Number of Related Temperature Sensors | 1 |
| Cable Length | 50 m (164 ft) |
Resources
Manuals (6)
Software/Firmware (2)
Certificates (1)
Case Studies (2)
Guides (1)
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