19 - 70
71130/11E/0318
6 Servicing
As the device does not have moving parts, i.e. is not subjected to wear during operation, only
minimal servicing is required.
The device may become soiled depending on its installation site. Cleaning should be carried out
using water, non-aggressive cleaning agents and a soft cloth.
The surface of the instrument cover is roughened for measurement technique reasons, and must
not be polished, by no means. The cover is to be cleaned with soft cloth and brushes only, without
polishing effect, and by a fat-dissolving cleaning agent (dish liquid, no aggressive solvents such as
Acetone).
Caution:
During storage, installation, dismantling, transport or servicing
of the WEATHER STATION, it must be ensured that no water
gets into the device or plug connector.
The cover surface should not be touched with palms or fingers,
in order to avoid a contamination through skin-fat
6.1 Calibration
The WEATHER STATION does not contain any adjustable components such as mechanical or
electrical trimming elements. All components and materials are invariant over time. There is thus no
need for regular calibration due to ageing. Only major mechanical deformation of the device and a
resulting change in the measurement path length of the ultrasonic converters can cause errors in
measured values.
The acoustic virtual temperature can be used to check the effective length of the acoustic
measurement path. A change of approx. 1% in the measurement path length and thus a measuring
error of approx. 1% of the wind speed corresponds to a deviation of the acoustic temperature of
approx. 6K at 20°C. A deviation in the acoustic temperature of 2 Kelvin from the real acoustic air
temperature could lead to a measuring error of the wind speed of approx. 0,34%.
Due to the construction of the instrument a significant change in the measurement path length
without mechanical damage of the housing can be excluded.
Important:
Mechanical damage involving deformation of the device may
lead to errors in measured values.
