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Lufft - Model NIRS31-UMB -Non-Invasive Road Condition Sensor
The NIRS31-UMB is a non-invasive road weather sensor with optical measuring principle. It is mounted at masts or bridges up to 50 ft distance to the measurement spot on the road and can even monitor bridges. It measures surface conditions such as surface temperature, wetness, ice, snow, or frost as well as water film heights and calculates additional parameters like ice percentage in water, freeze point temperature and generates the friction coefficient on the road.
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.
Representitive measurement of the road condition
Road condition is evaluated over a representive spot area of the road surface of >2 sqm.
High-quality road condition parameters for comprehensive description
Sensor measures on multiple wavelengths in the infrared optical range and delivers important road information: surface temperature, water film height, ice layer thickness, ice percentage, freezing temperature, road condition index, friction and snow height.
- Technical Attributes
- *Parameters Measured:
- Surface temperature
- Water film height
- Ice layer thickness
- Ice percentage
- Freezing temperature
- Road condition (dry, damp, wet, snow, ice)
- Friction
- Snow height
- Accuracy:
- Road surface temperature: ±1.5 °F
- Water film height: ±0.04 in or ± 20 % of measurement value
- Cable Connection: Open wires
- Cable Length: 50 ft (15 m)
- Communication: SDI-12, RS485-UMB
- Detectable road conditions: Dry, Damp, Wet, Snow, Ice
- Dimensions: 16.7 x 8.86 x 11.22 in (425 x 225 x 285 mm)
- Height above Absolute Altitude: 9843 ft (3000 m)
- Interface:
- RS485 2 wire
- Baud rates: 1200 - 57600 bit/s (Standard 19200)
- SDI-12: 1200 fixed
- IP Rating: IP65
- Lamp Lifetime: 2 years
- Layer Thickness: Water, Snow, Ice
- Material Enclosures: Aluminium housing with plastic cover
- Measurement distance: 50 ft (15 m)
- Measurement technology: Optical spectroscopic principle, lamp transmitter, pyrometer
- Measuring Range:
- Layer thickness: 0-0.08 in (snow 0 - 0.4 in)
- Friction: 0-1 (critical - dry)
- Pyrometer: -40 - +158 °F (-40 - +70 °C)
- Operating Humidity: 0 - 100 % RH
- Operating Temperature Range: -40 - +176 °F
- Operating voltage: 12 - 24 VDC ±10 %
- Power Consumption: 40 VA, 15 VA in energy saving mode
- Power Supply: 12 - 24 VDC ±10 %
- Product highlights:
- Non-invasive
- Easy to install
- Easy to add to existing measurement networks
- Friction measurement
- Real time data providing
- Resolution:
- Layer thickness: 0.01 mm
- Pyrometer: 0.1 °C
- Standard storage temperature: -40 - +158 °F
- Weight: 22 lb (10 kg)
- Weather Related Traffic Management