MWS 9-5e.p65 Page 12
MWS 9-5 Manual
erstellt am 30.05.2012 von DO
REINHARDT
System- und Messelectronic GmbH
Fax: 08196/7005 and 1414 email:
Web:
www.reinhardt-wetterstationen.de
3.3.4 Solar Sensor
This is a pyranometer which absorbs radiation between 305 and 2800 nm. The tem perature of a
black and a reflecting element is subtracted and linearised by the software. The measuring sensors
are two semi-conductor sensors.
The values are edited in W/m
2
.
The measured value reaches 90 % of its final value after about 90 seconds.
Range: from 0 to 1300 W/m
2
with ±40 W/m
2
accuracy.
3.3.5 Wind Speed Sensor
is an anemometer with magnetic scanning. Wind speed is measured contactless using a Hall
sensor (V1.2 and later) or a Reed-contact. A peak detector holds every gust and hands it on to the
measuring software. An average value for the respective memory interval is determined.
Range: in km/h from 0 to 150 km/h with ± 2 km/h measuring accuracy, (display also in m/s, miles/h,
Knot or Beaufort), breakaway speed ca 0.5 m/s.
As we have a very comfortable, 3-fold way of measuring wind speed with current wind speed (WG),
average wind speed (WD) and gust (WS), you can adapt your wind measurement to your very needs.
Please note that dependent on the current winds, the 3 different methods of measuring wind
speed can result in very differing graphs: When measuring WG, only a current value is written
in the selected measuring interval, when measuring WD and WS, there is continuous evaluation
and the whole measuring period is moni tored.
3.3.6 Wind Direction Sensor
Versions up to 1.1:
There is a weather vane with an endless precision potentiometer of 10 kOhms and a rotation angle
of 360 ° for measuring wind direction. Wind direction is given in °, with 90° being East, 180° being
South, 270° being West and 0 ° being North.
Range: in 360 °, measuring accuracy 5 ° with a dead angle of app. 10° in the North, breakaway
speed
ca. 0.6m/s,
< 0.6 m/s, hysteresis < 8°.
Please note, that in North direction (changing from 360° to 0°) wrong values may occur! This is
caused by switching from maximum to minimum value of winddirection. To get highly accurate
winddirection measurement, you should use the sensor with the identifier WV (main winddirec-
tion). This sensor is averaged over a storage interval so that these rare faulty values don't lead
to wrong measurement.
Output is performed as WR (current winddirection) and WV (main wind direction within a storage
interval). The value WR always has got a value between 0 and 359.9°. WV only has got values
between 0 and 359.9° if WG > 0. If WG = 0, WV has got a value of -99997, which means, that no
valid value for the main winddirection is available. This is clear for when windspeed = 0 no main
winddirection can be calculated.
With Version 1.2 the potentiometer will be replaced by a precision magnetical encoder without
dead angle in the north direction. (since 2009)
