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Diameter [mm]
Fall speed [m/s]
0.2 (drizzle)
0.73
0.3 (drizzle)
1.2
0.8 (rain)
3.3
0.9 (rain)
3.7
1.8 (rain)
6.1
2.2 (rain)
6.9
3.2 (rain)
8.3
5.8 (rain)
9.2
Table 1: Example for the speed of liquid particles
The calculated data are memorized over one minute, and then transmitted via the serial interface.
The instrument is almost maintenance-free. Only the panes of the sensor heads should be cleaned,
if necessary. An application all the year round is guaranteed by the integrated pane-heating. For
application in areas of extreme weather conditions (for example high mountains) we recommend a
model with “extended heating”. The effect of external light is minimized by a modulated light source
of 173kHz (so-called „Lock-In“ technology). The effect of aging and temperature on the components
as well as the soiling of the glass panes is compensated by controlling the receiving capacity. A
watch-dog device controls the signal processor (DSP). The sensor controls its function by
measuring and checking the receiving signals for soiling, as well as checking the laser driver for
current and temperature. By using a flash-memory the internal software can be updated any time
via the serial interface.
The following outputs are available: an electrically isolated serial interface (RS485) as well as two
digital outputs (optocoupler). Thanks to the configurable digital outputs this sensor can be used as
an alternative for precipitation monitors (e.g. IRSS88 or Thies 5.4103.10.000), and for precipitation
sensors (e.g. tipping bucket).
The function of the digital outputs is programmable. For example: output 1
0,1mm or 0,01 resp. 0,005 mm precipitation per pulse corresponding to the cumulatively measured
precipitation quantity. Output 2, for example, as precipitation event monitor, or as additional event
output „solid precipitation“ (snow, snow-grains, soft hail, hail) in conjunction with output 1.
In addition, the following sensors can be connected optionally („Option Measuring Channels”):
•
temperature (Pt100, not available with option “Extended Heating”)
•
relative humidity (0-1V / 0-100% rel. humidity)
•
wind speed (frequency 0- 630 Hz for example 4.3519.00.000)
•
wind direction (serially synchronous for example 4.3129.00.000)
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