Operating Manual
Smart Weather Sensor
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
19
6.12 Precipitation Quantity - Absolute
Sampling rate
Event-dependent on reaching the response threshold
Response threshold
0.01mm (Radar)
Response threshold
0.2 / 0.5 mm (Rain Gauge)
Units
l/m²; mm; in; mil
Request channels:
UMB Channel
Measurement Variable (float32)
Unit
600
Precipitation Quantity - Absolute
l/m²
620
Precipitation Quantity - Absolute
mm
640
Precipitation Quantity - Absolute
in
660
Precipitation Quantity - Absolute
mil
Note:
This measurement indicates the accumulated precipitation quantity since the last
device reboot. The measurement is retained for the duration of a short power failure. To
reset this value, use the corresponding function in the UMB-Config-Tool (see page 35) or
disconnect the device from the power supply for at least one hour.
6.13 Precipitation Quantity - Differential
Sampling rate
Event-dependent on reaching the response threshold
Response threshold
0.01mm (Radar)
Response threshold
0.2 / 0.5 mm (Rain Gauge)
Units
l/m²; mm; in; mil
Request channels:
UMB Chanel
Measurement Variable (float32)
Unit
605
Precipitation Quantity - Differential
l/m²
625
Precipitation Quantity - Differential
mm
645
Precipitation Quantity - Differential
in
665
Precipitation Quantity - Differential
mil
Note:
Each request from a differential channel sets the accumulated quantity back to zero. If
the response from the device is lost due to a transmission error (e.g. poor GPRS
connection), the quantity accumulated to date is also lost. The quantity accumulated to date
is also reset each time the equipment is rebooted.
6.14 Precipitation Intensity
Sampling rate
1 minute
Response threshold
0.1 mm/h
Units
l/m²/h; mm/h; in/h; mil/h
Request channels:
UMB Channel
Measurement Variable (float32)
Range
Unit
800
Precipitation Intensity
0 … 200.0
l/m²/h
820
Precipitation Intensity
0 … 200.0
mm/h
840
Precipitation Intensity
0 … 7.874
in/h
860
Precipitation Intensity
0 … 7874
mil/h
Note:
The device versions with radar technology (WS400-UMB, WS600-UMB) calculate the
precipitation intensity from the accumulated precipitation differences of the last 6 minutes
before the measurement data request.
The lower resolution of the rain gauge would lead to high fluctuation of the intensity values,
so the rain gauge versions (WS401-UMB and WS601-UMB), as well as the external rain
gauge, use the accumulated precipitation of the last 60 minutes prior to the current
measurement for intensity calculation.