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4 Recommendation Side Selection / Standard Installation
In general, wind measuring instruments are supposed to record wind conditions over a large area.
According to international regulations, the surface wind should be measured at a height of 10 m
above even open terrain, in order to achieve comparable values. An open terrain is defined as ter-
rain where the distance between the wind-measuring instrument and the next obstacle is at least
ten times the height of this obstacle (acc. to VDI 3786 sheet 2 as well as Guide to Meteorological
Instruments and Methods of Observation, Sixth Edition, WMO-No. 8). If this regulation cannot be
fulfilled, the measuring instrument should be installed at a height at where the measurement values
are not influenced by any local obstacles. In any case, the measuring instruments should be in-
stalled at a height of 6 to 10 m above the mean height of the buildings or trees in the vicinity. If it is
necessary to install the instrument on a roof, it should be installed in the centre of the roof in order
to avoid any preferential directions.
5 Installation
Attention:
Storing, mounting, and operation under weather conditions is per-
missible only in vertical position, as otherwise water can get into the
instrument.
Remark:
When using fastening adapters (angle, traverses, etc) please take a possible ef-
fect to the measuring values by shading into consideration.
Caution:
The device may only be supplied with a power supply of the
"Class 2, limited power”.
Summary of Contents for 4.3351.00.000
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