Lufft - Model MARWIS -Mobile Weather Sensor, 1 m Installation Height
The mobile advanced 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 m above the surface and calculates 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. A standard data output rate is 1 Hz via RS485. 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.
Mobile sensor
Flexible and representative measurements from many vehicles, no fixed installation required, and hot spots for high water film heights or icying can easily be identified.
Non-invasive measuring principle
The optical (spectroscopic) measuring principle delivers the important road surface condition parameter without the need of construction works on the road itself.
Easy and flexible installation
Simple car mounting options and flexible data communication via Bluetooth, RS485, and CAN-Bus.
Low maintenance
Long life LED technique, no moving parts and easy cleaning procedure.
Technical Attributes
- *Parameters Measured:
- Road condition (dry, moist, wet, ice, snow, slush, chemically wet)
- Road surface temperature
- Ambient temperature
- Water film height up to 6 mm
- Dew point temperature
- Relative humidity
- Ice percentage
- Friction (calculated)
- Accuracy:
- Road surface temperature: ±1 .5 °F @ 32 °F
- Dew point temperature: 3 °F @ temperature of 32 - +95 °F
- Waterfilm film height: 10 %
- Cable Connection: Open wires
- Cable Length: 50 ft (15 m)
- Communication: Bluetooth, RS485-UMB, CAN-Bus
- Detectable road conditions: Dry, damp, wet, snow-/ice-covered, chemically wet, slush
- Dimensions: 4.3 x 7.9 x 3.9 in (110 x 200 x 100 mm)
- Height above Absolute Altitude: 9843 ft (3000 m)
- Interface:
- RS485
- 2 wire, half duplex, bluetooth, CAN
- IP Rating: IP68
- Layer Thickness: Water, Snow, ICe
- Light Source: LED
- Material Enclosures: Aluminium housing with plastic cover
- Measurement distance: 3.3 ft (1 m)
- Measurement technology: Optical spectroscopic principle, LED transmitter, pyrometer
- Measuring Range:
- Road surface temperature: -40 - +158 °F
- Ambient temperature: -58 - +158 °F
- Relative air humidity: 0 - 100 %
- Relative humidity above road surface: 0 - 100 %
- Dew point temperature: -58 - +140 °F
- Waterfilm film height: 0 - 6000 µm
- (Max. WFH is only achieved with concrete underground.
- For asphalt, the maximum measurable water film height is smaller
- and depends on the distance to the ground.)
- Ice Percentage: 0 - 100 %
- Friction: 0 - 1
- Operating Humidity: 95 % RH (non-condensing)
- 0 - 100 % RH
- Operating Temperature Range: -40 - +140 °F
- Operating voltage: 10 - 28 VDC on the sensor
- Power Consumption: Approx. 3 VA without heating, 50 VA with heating
- Product highlights:
- Mobile, plug and play
- 100 measurements per second with max. output rate of 10Hz
- Multifunctional
- Real time thermal mapping
- Wireless data transfer
- Resolution:
- Road surface temperature: 32.18 °F (0.1 °C)
- Ambient temperature: 32.18 °F (0.1 °C)
- Relative air humidity: 1%
- Relative humidity above road surface: 0.1%
- Dew point temperature: 32.18 °F (0.1 °C)
- Waterfilm film height: 1 µm
- Ice Percentage: 1%
- Friction: 0.01
- Standard storage temperature: -40 - +158 °F
- Temperature Accuracy: ±0.5 °C from 40 km/h (25 mph) on
- Temperature Range: -40 - +70 °C
- Temperature Resolution: 32.02 °F (0.01 °C)
- Weight: 3.7 lb (1.7 kg)
- Weather Related Traffic Management