COMPONENT
WXT520
Weather Transmitter
Overview
The WXT520 Weather Transmitter, manufactured
by Vaisala, measures wind speed and direction,
precipitation, barometric pressure, temperature, and
relative humidity - all in a single device that has no
moving parts. The WXT520 outputs an SDI-12 signal
that can be measured by many of our dataloggers.
The WXT520 is about the size of a larger Gill radiation
shield, making it ideal for use with our CR200-series
dataloggers in applications requiring quick, short-
term deployment. However, the WXT520 is not
intended for weather stations that require research-
grade performance.
Wind Speed and Direction
The WXT520’s wind sensor consists of three equally
spaced transducers that produce ultrasonic signals.
Wind speed and direction are determined by
measuring the time it takes for the ultrasonic signal
of one transducer to travel to the other transducers.
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More info:
+44(0) 1509 828 888
Weather Transmitter
Single device that measures
wind speed & direction,
precipitation,
barometric pressure,
temperature and relative humidity
Benefi ts and Features
Single device that measures wind speed and direction,
precipitation, barometric pressure, temperature and relative
humidity
No moving parts
Ideal for use with CR200-series dataloggers
Housed in radiation shield that protects the unit and refl ects
solar radiation
An optional bird spike kit can be added to discourage birds
from roosting without harming the birds and with minimal
interference to performance
Precipitation
Precipitation is measured one raindrop at a time.
Whenever a raindrop hits the precipitation sensor, an
electrical signal is produced that is proportional to the
volume of the drop. From this signal, precipitation is
calculated.
Barometric Pressure, Temperature, and Relative
Humidity (RH)
The WXT520 has a PTU module that contains a capacitive
silicon BAROCAP
®
sensor for barometric pressure
measurements, a capacitive ceramic THERMOCAP
®
sensor
for air temperature measurements, and a capacitive thin
fi lm polymer HUMICAP
®
sensor for relative humidity
(RH) measurements. The PTU is housed in a naturally-
aspirated radiation shield that protects the PTU and
refl ects solar radiation.
Mounting
A simple mounting tube is available for the WXT520. The
mounting tube fastens to a CM202, CM204, or CM206
crossarm via a 008285 NU-RAIL fi tting.
The #25299 is an optional mounting kit for the WXT520.
It provides better water protection. When using the
#25299, the WXT520’s IP classifi cation is IP66; otherwise
its classifi cation is IP65. The #25299 fastens to a crossarm
via the 008285 NU-RAIL fi tting.
