MARWIS is the first mobile road and runway weather sensor that has been developed specifically for the detection of road conditions, friction, temperatures, and other parameters in real-time from driving vehicles.
The mobile road weather sensor referred to as MARWIS turns vehicles into driving weather stations by detecting numerous runway weather and crucial road parameters. It can also be installed on vehicles with a distance of around 1 to 2 m above the surface.
Furthermore, it gives information regarding dew points, water film heights, temperatures, road conditions (wet, dry, ice snow, and moist), ice percentages, friction, and relative humidity ranging up to a frequency of 100 times per second.
MARWIS acts as significant decision support concerning preventive gritting. As a result of the open interface protocols, it can be combined easily into current winter maintenance monitoring networks. Likewise, the mobile road sensor has the potential to communicate directly with the help of a control system on gritting vehicles. The measurement data output supports the protocol UMB binary.
Table 1. Source: OTT HydroMet
| . |
. |
| Parameters measured: |
Layer thickness of water, snow and ice, surface conditions (dry, damp, wet, snow, ice), friction, optional: road surface temperature |
| Measurement technology: |
Weighing principle |
| Product Highlights: |
Mobile, plug and play, 100 measurements per second with max. output rate of 10Hz, multifunctional, real time thermal mapping, wireless data transfer |
| Interface: |
Bluetooth, RS485, CAN-Bus |
Image Credit: OTT HydroMet
Image Credit: OTT HydroMet
Advantages
- Easy data transfer via Bluetooth, RS485 or CAN-Bus
- Dynamic mobile data in real time and 100 times per second and a max. output rate of 10Hz.
- 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
Examples of Use
- 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
Technical Data
Table 2. Source: OTT HydroMet
| 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 |
|
| 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 |