Vaisala HMD70U Service Manual Page 146

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144
Weather
Vaisala Weather Transmitter WXT520
Access to Real Time Weather Data
The WXT520 has an automatic control circuit that switches the heating on
at low temperatures.
Features/Benefits
Measures 6 most essential
weather parameters
Accurate and stable
Low power consumption
– works also with solar panels
Compact, light-weight
Easy to install with one-bolt
mounting method
No moving parts
Heating available
Vaisala Configuration Tool
for pc
USB connection
IP66 housing with mounting kit
Applications: weather stations,
dense networks, harbors,
marinas
Measuring Acoustic
Precipitation
The WXT520 precipitation
measurement is based on the unique
Vaisala RAINCAP
®
Sensor, which
detects the impact of individual
rain drops. The signals exerting
from the impacts are proportional
to the volume of the drops.
Hence, the signal from each drop
can be converted directly to the
accumulated rainfall.
The WXT520 measures accumulated
rainfall, rain intensity and duration of
the rain — all in real time.
The Vaisala RAINCAP
®
Sensor is the
only maintenance-free precipitation
sensor on the market.
WXT520
The Vaisala Weather Transmitter
WXT520 measures barometric
pressure, humidity, precipitation,
temperature, and wind speed and
direction.
To measure wind speed and
direction, the WXT520 has the
Vaisala WINDCAP
®
Sensor that uses
ultrasound to determine horizontal
wind speed and direction.
The array of three equally spaced
transducers on a horizontal plane is
a Vaisala specific design. Barometric
pressure, temperature, and humidity
measurements are combined in
the PTU module using capacitive
measurement for each parameter.
It is easy to change the module
without any contact with the
sensors.
The WXT520 is immune to flooding
clogging, wetting, and evaporation
losses in the rain measurement.
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