ARS31(Pro)-UMB
Operating Manual V9/03.2017
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
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9 Technical data
9.1 Measurements
9.1.1 Freezing temperature
Measurement range:
-
40 … 0, however Tg ≥ Tu - 20°C
1)
Accuracy:
0.5 °C for Tg > -15°C (with NaCl, according to CEN/TC 15518-4)
1.5 °C for Tg < -15°C (with NaCl, according to CEN/TC 15518-4)
Resolution:
0.1°C
De-icing agent:
Any desired de-icing agent; however the electrical conductivity of
the solution must be > 1 mS/cm
9.1.2 Saline concentration
Measurement range:
0 ... 100%
Accuracy:
Computed from the freezing temperature according to CEN/TC
15518-4
Resolution:
0.1%
De-icing agent:
Any desired de-icing agent; however the electrical conductivity of
the solution must be > 1 mS/cm
9.1.3 Status of freezing temperature measurement
Transmitted on Channel 900:
0 -> Start conditions not fulfilled
1 -> Sensor surface dry
2 -> Freezing temperature was calculated
3 -> Freezing temperature was not calculated
4 -> Too cold to measure
5 -> Freezing temperature below road temperature minus 20°C (Tg < (Tu
– 20°C))
9.1.4
Status of “threat of icing”
Transmitted on Channel 901:
0 -> No threat of icing
1 -> Threat of icing
2 -> Threat of icing was not determined
Channel 901 is only available with ARS31Pro-UMB Sensor.
9.1.5 Road surface temperature ARS31Pro-UMB
Principle:
NTC
Measurement range:
-40 ... 80°C
Accuracy:
±0.2°C (-10...10°C), otherwise ±0.5°C
Resolution:
0.1°C
9.1.6 Road surface temperature ARS31-UMB
Principle:
NTC
Measurement range:
-40 ... 80°C
Accuracy:
Quantitative statement only as errors arise due to
selfheating
Resolution:
0.1°C
9.2 Storage conditions (complete sensor)
Permissible storage temp.:
-40°C ... +70°C (in packing)
