Manual
LCom
Page 110 of 158
Alarm 2:
Is set if FREEZE-TEMPERATURE is rising AND
FREEZE-TEMPERATURE is greater or equal to (ROAD-TEMPERATURE
– 2.0)
i.e. if the freeze temperature is
rising (over “Freeze Temp Rising Min.” minutes) and 2
(or less) ° below the road temperature
Alarm 3 Freeze Temperature
– black ice
Is set if FREEZE-TEMPERATURE is rising AND ((ROAD-TEMPERATURE
–
FREEZE-TEMPERATURE) < 0.2)
i.e. if the freeze temperature is
rising (over “Freeze Temp Rising Min.” minutes) and
0.2 (or less) ° below the road temperature
Alarm 3 Dewpoint
– slippery frost
Is set, if (SALINE-CONCENTRATION = 0) AND (ROAD-TEMPERATURE < 0) AND
(AIR-TEMPERATURE > (ROAD-TEMPE2)) AND (DEWPOINT > -4), i.e. if
there is no residual salt, and road temperature is below 0 °C and air temperature is at
least 2 °C above road temperature, and dewpoint is above -4 °C
Alarm 3 Precipitation
– freezing rain
Is set, if (PRECIPITATION-
TYPE = “Rain”) for at least “Const. Rain Min.” minutes,
and (ROAD-
TEMPERATURE < 0), i.e. precipitation type is “Rain” for at least the
“Const. Rain Min.” (default 10) minutes, and road temperature is below 0°C.
Alarm 3 Precipitation
– snow
Is set, if (PRECIPITATION-
TYPE = “Snow”) for at least “Const. Snow Min.” minutes,
and (ROAD-
TEMPERATURE < 0.2), i.e. precipitation type is “Snow” for at least the
“Const. Snow Min.” (default 15) minutes, and road temperature is below 0.2 °C.
5.13.4 Prognosis Road Condition
