Operating Manual V8.2/03.2017
Non Invasive Road Sensor
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
13
7.1.5
Road Condition
Sampling rate
<1 minute
Units
logic coding
Request channels:
UMB Channel
Coding
act
Measurement Variable (uint8)
900
Road condition
0
Dry
1
Damp
2
Wet
3
Ice
4
Snow / ice
5
Chemically wet
6
Critically wet
8
Snow
99
Undefined
dry:
on the road there is no liquid water, the water film height is less than
the damp threshold
damp:
on the road there is liquid water; the water film height is less than the
wet threshold
wet:
on the road there is liquid water; water film height is equal or greater
than the wet threshold
snow / ice:
frozen water is on the road; it’s in the form of snow or ice; a
differentiation is not possible.
snow:
frozen water is on the road; it’s mostly in the form of snow
ice:
frozen water is on the road; it’s mostly in the form of ice
chemically wet:
water film height is equal to or greater than the damp threshold and
the road temperature is below 1.5 °C, the formation of ice is
prevented by using de-icing chemicals.
critically wet:
water film height is equal to or greater than the damp threshold and
the road temperature is below 1.5 °C, the formation of ice particles
has already begun.
The thresholds for damp and wet in the factory settings are 30 and 100µm, they can be
adjusted in the sensor configuration.
