2
(145x6)
METEOROLOGY
Operating
Instructions
Operating Instructions
Wind Sensors METEOROLOGY (145x6)
Putting into operation
The wind can be represented by a vector quantity. For a
complete description of the wind it is necessary to specify
its speed and direction. The two components are subject to
spatial and temporal variations; thus, strictly speaking, they
are valid only for the site where the measuring instrument is
put up. We therefore recommend to select the place of instal-
lation very carefully.
Selecting the place of installation
Generally, wind measuring instruments should not measure
the specifi c wind conditions of a limited area, but indicate the
typical wind conditions of a wider area. The values measured
at different places must be comparable.
Thus, when installing the sensor you should make sure the
place of installation is not under the lee of great obstacles.
The distance between the obstacles and the sensor should
be 10 times the height of the obstacles (this corresponds to
the defi nition of an undisturbed terrain).
If an
undisturbed terrain
of this kind does not exist the sensor
must be put up at a height of at least 5 m above the obstacle
height.
If the sensor must be installed on a roof top the place of instal-
lation must be in the middle of the roof to avoid predominant
wind directions.
If you want to measure both wind direction and wind speed, in-
stall the sensors at the same measuring point, if possible, and
make sure to avoid any mutual infl uence of the sensors.
A wind sensor pair easily meets this requirement since the
sensors are set up side by side. Their horizontal distance
should be approximately 1.5 m. The two sensors must be
staggered vertically so that the lower edge of the upper wind
speed sensor is 0.1 to 0.5 m above the upper edge of the
lower wind direction sensor.
Attention!
Ladders or other lifting helps must be absolutely
in order and must be guarantee a secure support!
Follow the rules for prevention of accidents.
Mounting the sensor on the mast
Mount the sensor at the top of a grounded tube with an outer
diameter of 50 to 52 mm. Make sure the device is easily ac-
cessible so that you can set up the north direction for the wind
direction sensor and perform any maintenance work.
To reach the sensors use a ladder of the appropriate length or
a telescoping working platform of the appropriate height.
You can also use masts that can turn around their vertical
axis or masts consisting of individual segments or telescop-
ing masts that you can secure after setting up the north
direction.
If wind speed and wind direction are measured at the same
time, the measurement generally takes place not only at the
top of a mast but also at the ends of a cross arm. The arms
must stay torsion-free and vibration-proof even at high wind
speeds and they must be accessible for you to perform mount-
ing and maintenance work.
When you install the connecting cables make sure not to
excessively shorten the cable leading to the connector in the
lower part of the sensor casing so that you can later maintain
or dismount the sensor.
View of the cable routing on a wind cross arm.
