• Pulse output
• Intensity-dependent linearization
• Instrument serves as sensor for quantity and intensity of pre-
cipitation, for the digital transmission of measuring values
Description
The instrument is designed to measure the height, quantity and the intensity of the precipitation
striking the surface of the earth. The measuring principle is basing on the description „Guide to
Meteorological Instruments No 8“ of the WMO (World Meteorological Organization).
The rain, collected by the collecting surface of 200 cm², is conducted through a infl ow-sieve into
a tipping-bucket. After having collected the rain amount of 2 cm³ of precipitation the bucket tips
over, and the other tipping-bucket halve is ready for collecting the rain. This tipping procedure is
detected by Reed-switches, and induces an output pulse in combination with connected electronics.
The procedures recur with continuous precipitation.
2 cm³ tipping-bucket volume = 1 tipping-bucket puls = 0,1 mm precipitation
Output 1:
As the number of tipping procedures is not linear to the precipitation intensity, an intensity-depend-
ent linearization is carried out in the connected electronics. The linearization procedure is basing
on an intensity-dependent pulse-number-correction for the precipitation intensity range of approx.
0,5… 11 mm/min.
Each instrument is calibrated with a precipitation quantity of 200 cm³ (=10 mm precipitation height).
Output 2:
is available only as potential-free contact. This output is not linearized.
Precipitation Sensor Thies
Dimensional drawing
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Precipitation Sensor Thies
Specications
Charateristic Desciption / Value
Collector surface 200 cm²
Resolution 0.1 mm per tipping-bucket pulse
Measuring range 0 ...11 mm/min
Accuracy output 1 within the range of 0 ... 11 mm/min ±3 % (tested under laboratory conditions with distilled water)
Measuring principle tipping-bucket
Ambient temperature 0 ... +60 °C (without heating), -25 ... +60 °C (with heating)
Output signal 1 (Reed contact with linearization)
Pulse length 125 ms
Tipping-bucket frequency 0 ... 2 Hz
Operating voltage 5 VDC
Output signal 2
Pulse length 50 ms
I Pulse frequency 0 ... 2 Hz
Contact load max. 0.5 W
Contact voltage (Vcc) max. 42 V
Heating 24 VAC/DC; 48.5 W
Montage onto mast tube Ø 50 mm
Weight 3.3 kg
Manufacturer Thies
Accessories Module M83200 or M83570
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Precipitation Sensor Thies
Sensor connection to Ammonit Meteo-40 data logger
Sensor Plug Pin No. Ammonit Cable Wire Colour Meteo-40 Counter Supply Sensor
Precipitation (Output 1) 2 white CNT (Pull-up resistor)
Ground (Output 1) 3 blue Main Ground
Precipitation (Output 2) 1 red CNT (Pull-up resistor)
Ground (Output 2) 4 black Main Ground
Heating
6 orange, orange
24 VAC/DC
7 violet, violet
Cable type without heating: LiYCY 2 x 0.25 mm²
Cable type with heating wires: LiYCY 8 x 0.25 mm²
Connect the shield logger-sided to Ground (GND)
Sensor connection diagram to Ammonit Meteo-40 data logger
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