Irs21 lufft intelligent road surface sensor, Function – Campbell Scientific IRS21 Road Weather User Manual
Page 5
IRS21 Lufft Intelligent Road Surface
Sensor
1. Function
The IRS21 is a sensor that makes measurements of road surface. From
measurements taken, the outputs are up to three temperatures, conductivity,
percent salt, freezing temperature, road condition, and water film height. There
is also an error status output from the sensor. The sensor is used for road
weather stations.
Multiple frequency measurement,
measuring water film height,
snow, and ice
FIGURE 1-1. IRS21
Measuring wet/dry
(conductivity)
Measuring salt
concentration to
calculate the freezing
temperature
Sub-surface temp. 1
(not installed)
Measuring the road surface temperature
Sub-surface temp. 2
(not installed)
1
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