Operating Manual
Smart Weather Sensor
14
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
5
Generation of Measurements
5.1
Current Measurement (act)
In accordance with the specified sampling rate, the value of the last measurement is
transmitted when the current measurement value is requested. Each measurement is stored
in a circular buffer for the subsequent calculation of minimum, maximum and average
values.
5.2
Minimum and Maximum Values (min and max)
When requesting the minimum and maximum values, the corresponding value is calculated -
via the circular buffer at the interval (1
– 10 minutes) specified in the configuration - and
transmitted.
Note:
In the case of wind direction, the minimum / maximum value indicates the direction at
which the minimum / maximum wind speed was measured.
5.3
Average Value (avg)
When requesting the average value, this is calculated - via the circular buffer at the interval
(1
– 10 minutes) specified in the configuration - and transmitted. In this way moving
averages can also be calculated.
For some values the standard deviation is calculated for the same interval. The calculation of
standard deviation will only be activated after the related UMB channel has been requested
for the first time.
5.4
Vectorial Average Value (vct)
In the specific case of wind measurement, measurements are calculated vectorially. To this
end, the average values of the vectors are generated internally. Hence the value (wind
speed) and angle (wind direction) of the vector are calculated.
Note:
On delivery, the interval for the calculation of minimum, maximum and average values
is set at 10 minutes. If necessary, this can be adjusted to the particular requirements (1
– 10
minutes) with the aid of the UMB-Config-Tool (see page 30).
Note:
The evaluation of the standard deviation values is deactivated after power on of the
device. The function will be activated with the first request to any of the standard deviation
channels.
To get standard deviation values of the first integration period after power on a dummy
request to any one of the standard deviation channels should be inserted.