OTT HydroMet

- Model StaRWIS-UMB - Stationary Road Weather Information Sensor

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For stationary operations we further developed the innovation award-winning mobile road weather Sensor MARWIS - this is StaRWIS! StaRWIS is the first non-invasive road weather sensor detecting road and runway surface conditions, surface temperatures, relative humidity, dew & freezing temperatures, ice percentages as well as friction non-invasively and based on innovative LED Technology with 4 lenses.

  • Parameters measured: Road condition (dry, moist, wet, ice, snow, critical wet, chemically wet), road surface temperature, ambient temperature, water film height, dew point temperature, relative humidity, ice percentage, freezing temperature, friction (calculated)
  • Measurement technology: Optical LED transmitters, photo receivers, pyrometer, infrared
  • Product highlights: non-invasive, plug and play, 100 measurement per second, multifunctional, wireless data transfer, no moving parts
  • Interfaces: Bluetooth, RS485, CAN-Bus, UMB - protocol

Advantages of the stationary non-invasive road sensor StaRWIS

  • No moving parts due to award-winning and innovative LED Technology
  • Non-invasive measurement principle
  • Data transfer via Bluetooth, RS485 or CAN-Bus
  • Mulifunctionality
  • Measurements both on the ground and in the ambient air
  • Easy to install and to clean

Examples of use of the stationary non-invasive road sensor StaRWIS
  • 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

  • General :
    • Dimensions : Height approx. 110 mm, width approx. 200mm, depth approx. 100mm
    • Weight : 1.7kg
    • Admissible storage temperature : -40...70°C
    • Operating rel. humidity :
    • Operating voltage : 10VDC...28VDC 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 : 3000m
    • 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
  • Waterfilm height :
    • Principle : Optical
    • Measuring range : 0 ... 6000 µm
    • Unit : µm
    • Resolution : 1 µm
  • Ice Percentage :
    • Measuring range : 0 ... 100 %
    • Unit : %
    • Resolution : 1%
  • Friction :
    • Measuring range : 0 ... 1
    • Resolution : 0.01

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