OTT HydroMet

- Model LUFFT MARWIS - Mobile Advanced Road Weather Information Sensor

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LUFFT MARWIS is the first road and runway weather sensor detecting road conditions, temperatures, friction and other parameters mobile and in real time from driving vehicles. The mobile road weather sensor MARWIS turns vehicles into driving weather stations by detecting several critical road and runway weather parameters. It can be installed on vehicles with a distance of 1 - 2m above the surface and delivers information about temperatures, waterfilm heights, dew points, road conditions (dry, moist, wet, snow, ice), ice percentages, rel. humidity and friction with a frequency of up to 100 times per second. It serves as an important decision support with regard to preventive gritting. Due to the open interface protocols, MARWIS can be easily integrated into existing winter maintenance monitoring networks. Similarly, the mobile road sensor can communicate directly with the control system on gritting vehicles. The measurement data output supports the protocol UMB binary.

Due to the open interface protocols, MARWIS can be easily integrated into existing winter maintenance monitoring networks. Similarly, the mobile road sensor can communicate directly with the control system on gritting vehicles. The measurement data output supports the protocol UMB binary.

  • Parameters measured: Road condition (dry, moist, wet, ice, snow, critical wet, chemically wet), road surface temperature, ambient temperature, water film height up to 6mm, dew point temperature, relative humidity, ice percentage, friction (calculated)
  • Measurement technology: Optical LED transmitters, photo receivers, pyrometer, infrared
  • Product highlights: Mobile, plug and play, 100 measurement per second, multifunctional, real time thermal mapping, wireless data transfer
  • Interfaces: Bluetooth, RS485, CAN-Bus

Examples of use of the mobile road and weather sensor MARWIS:
  • Decision support for winter maintenance operators on roads, motorways, highways (municipalities, federal states and provinces)
  • Decision support for the de-icing of runways (higher efficiency)
  • As important part of the IDS (Ice Detection System) in form of a RCC (Runway Condition Code), water film height (aqua-planning risk) and friction detector on airports (digital alternative to mechanic grip testers)
  • For smart city applications
  • For weather data collection and weather forecast model improvements

Advantages of the mobile road and weather sensor MARWIS:
  • Easy data transfer via Bluetooth, RS485 or CAN-Bus
  • Dynamic mobile data in real time and 100 times per second
  • Multifunctionality
  • Measurements both on the ground and in the ambient air
  • Easy to install and to clean
  • Free MARWIS app for calibration, data view as well as transfer available on Google Play and iTunes
  • One or two meter version for different vehicle types

  • General :
    • Dimensions : Height approx. 110 mm, width approx. 200 mm, depth approx. 100 mm
    • Weight : 1.7 kg
    • Admissible storage temperature : -40...70 °C
    • Operating rel. humidity : <95 % relative humidity non-condensing
    • Operating voltage : 10...28 VDC on the sensor
    • Power consumption : Approx. 3VA without heating, 50VA with heating
    • Operating temperature : -40...60 °C
    • Operating rel. humidity : 0...100 % RH
    • Protection type : IP68
    • Surface conditions : Dry, damp, wet, snow-/ice-covered, chemically wet, critically wet
    • Admissible height above absolute altitude : 3000 m
    • Interface : RS485, 2 wire, half duplex, bluetooth, CAN
  • Road surface temperature :
    • Principle : Optical
    • Measuring range : -40...70 °C
    • Unit : °C
    • Accuracy : ± 0.8 °C @ 0 °C
    • Resolution : 0.1 °C
    • Ambient temperature :
    • Measuring range : -50...70 °C (°F switchable)
    • Unit : °C (°F switchable)
    • Resolution : 0.1 °C
  • Relative Air Humidity :
    • Measuring range : 0...100 %
    • Unit : %
    • Resolution : 1 %
    • Principle : passive, calculated out of air temperature and humidity
  • Relative humidity above road surface :
    • Measuring range : 0 ... 100 %
    • Unit : %
    • Resolution : 0.1 %
    • Principle : passive, calculated out of air temperature and humidity above road surface
  • Dew point temperature :
    • Measuring range : -50 ... 60 °C
    • Unit : °C
    • Resolution : 0.1 °C
    • Principle : passive, calculated out of air temperature and humidity
    • Accuracy : 1.5 °C @ temperature of 0...35 °C
  • Waterfilm film height :
    • Principle : Optical
    • Measuring range : 0 ... 6000 µm
    • Unit : µm
    • Resolution : 1 µm
    • Accuracy : 10%
  • Ice Percentage :
    • Measuring range : 0 ... 100 %
    • Unit : %
    • Resolution : 1%
  • Friction :
    • Measuring range : 0...1
    • Resolution : 0.01

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