4
(145x6)
METEOROLOGY
Operating
Instructions
Operating Instructions
Wind Sensors METEOROLOGY (145x6)
If the preferred current of the power supply is according to
point 1 this will be a current range of 6.0...7.45 mA.
The data defi ned in DIN 19 234 show that the triggering of
switching or monitoring processes depends on the current in
the interface between the proximity switch and the amplifi er.
Thus, a current evaluation should be made when designing an
amplifi er for proximity switches according to DIN 19 234.
The cable resistance must not exceed 100 ohms.
Example: Discrete circuit
Circuit with OP amplifi er
The electronic heating...
... of the 14576 24V and 14566 24V models is powered by
an external power supply unit. The necessary voltage of
24 V
DC
is connected via the wires M(-) and G(+).
Grounding
To reduce the risk of inductive interference the sensor must
be properly grounded (screening on both sides).
The use of ready-made connecting cables (order no.
32.14566.060 xxx) guarantees a proper grounding between
sensor and cable. You just have to connect the cable screen-
ing to the ground of the indicator or the data acquisition unit.
When other cables are used, you must create an appropriate
screening.
Setting up the North direction for the wind vane
For wind direction measurements the north mark on the sen-
sor must be aligned with the geographical north direction; the
allowed maximum alignment deviation is ±3 degrees.
To set up the sensor’s north orientation select a landmark
which is as far as possible up north with regard to the fi nal
position of the wind direction sensor.
The reference point can be selected using a topographical
map (1:25000). The exact position of the reference point is
determined using an amplitude compass that can be adjusted
horizontally on a stand.
A point on the rotary knob and another point on the casing
shaft represent the north mark of the wind direction sensors.
These two marks must be exactly in line with each other; when
you have aligned the marks, you may fi x the wind vane with
e.g. a piece of adhesive tape. When you have fi xed the wind
vane this way you can locate the reference point by aiming
at it over the axis. Now you must turn the sensor casing on
the mounting tube until the tip of the wind vane points to the
reference point in the north.
Please make sure there is no magnetic deviation of the
compass.
Maximum interval
Wind direction Wind speed
a) 1 week
Time mark of the measuring station
(correction if necessary)
Visual control of the device function
Rough
verifi cation of the measured
values
b) 6 months
Measured value transmission test
Verify that the sensors are still fi xed to
the device carrier
Wind speed com-
parison
measurement
using a hand-held
anemometer
c) 2 years
Sensor calibration
Verifi cation of the north setup
If the weekly check according to a) gives cause to assume
the existence of any malfunction you must perform the checks
listed under b).
If the malfunctions are confirmed by these checks or are
revealed for the fi rst time you must perform the checks listed
under c).
When you have performed the checks listed under c) and the
data are not measured correctly, please contact the manufac-
turer Wilh. LAMBRECHT GmbH.
When the north direction is set up for the wind direction sen-
sor, tighten the headless screws in the lower part of the casing
and remove any adhesive tape, if necessary.
Using an indicating instrument or a data acquisition system,
verify the proper measurement and transmission of the meas-
ured values for at least three directions with an offset of 90
degrees from each other.
If you cannot select a northern reference point owing to local
conditions, you can proceed analogously using a reference
point in the south. In this case, however, you have to make
sure the north mark on the sensor does not point to the refer-
ence point but in the opposite direction.
Maintenance
The sensor design permits long periods of maintenance-free
operation. To obtain useful measured data the measuring sta-
tion must be systematically controlled and monitored.
The properties of the sensor may change due to wear, soil-
ing, and corrosion and as a result of external mechanical
infl uences. The properties of the electronic module may also
change.
We therefore recommend to check the measuring station pe-
riodically according to intervals listed in the following table:
