Operating Manual
ARS31(Pro)-UMB
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
29
8 Technical data
8.1 Measurements
8.1.1 Freezing temperature
Measurement range:
-
40 … 0, however Tg ≥ Tu - 20°C
1)
Accuracy:
0.5°C RMS for Tg > -15 °C, or
1.5°C RMS for
Tg < -15 °C (with NaCl)
Resolution:
0.1°C
De-icing agent:
Any desired de-icing agent; however the electrical
conductivity of the solution must be > 1 mS/cm
8.1.2 Saline concentration
Measurement range:
0 ... 100%
Accuracy:
Computed from the freezing temperature
Resolution:
0.1%
De-icing agent:
Any desired de-icing agent; however the electrical
conductivity of the solution must be > 1 mS/cm
8.1.3 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))
8.1.4
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.
8.1.5 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
8.1.6 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
8.2 Storage conditions (complete sensor)
Permissible storage temp.:
-40°C ... +80°C
Permissible relative humidity:
0 ... 98% RH due to packing
