Campbell WXT520 User manual

COMPONENTS
WXT520
Weather Sensor
Overview
The WXT520ameasures wind speed and direction, precipitation,
barometric pressure, temperature, and relative humidity—all in
a single device that has no moving parts. The WXT520’s small
size makes it ideal for quick, short-term deployments. However,
the WXT520 is not intended for weather stations that require
research-grade performance.
www.campbellsci.com/wxt520
Benets and Features
Low maintenance—no moving parts signicantly reduces
maintenance cost and time
Compact and lightweight
Low power consumption
Fast and simple to install
Low power consumption
Fast and simple to install
Outputs an SDI-12 signal that can be measured by many of
our dataloggersb
Combines the six weather parameters in one instrument
questions & quotes: 435.227.9000
Technical Description
The WXT520’s wind sensor consists of three equally spaced trans-
ducers 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.
Precipitation is measured one raindrop at a time. Whenever a
raindrop hits the precipitation sensor, an electrical signal is pro-
duced that is proportional to the volume of the drop.
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 lm polymer HUMICAP®
sensor for relative humidity measurements. The PTU is housed in
a naturally-aspirated radiation shield that protects it and reects
solar radiation.
ae WXT520 is manufactured by Vaisala.
bCompatible dataloggers include the CR200(X)-series, CR800, CR850, CR1000, CR3000, CR5000, CR510, CR10(X), and CR23X.

Campbell Scientic, Inc.
|
815 W 1800 N
|
Logan, UT 84321-1784
|
[phone]
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www.campbellsci.com
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© 2009, 2013
Campbell Scientic, Inc.
January 7, 2014
cWhen the bird spike kit is attached to the WXT520, more snow can accumulate on the WXT520, and the snow may melt slower.
dDue to the nature of the phenomenon, deviations caused by spatial variations may exist in precipitation readings, especially in short time scale.
Ordering Information
Weather Transmitter
WXT520 Weather Sensor (requires a sensor cable; see options below)
Cable Options (choose one)
-2 2 m Sensor Cable
-10 10 m Sensor Cable
Accessories
CM220 Right Angle Mounting Bracket for attaching the WXT520 to a
Campbell Scientic crossarm
17953 1-in x 1-in NU-RAIL Fitting for mounting the WXT520 to a
Campbell Scientic crossarm
25299 Optional WXT520 IP66 Mounting Kit.
25300 Bird Spike Kit for the WXT520.
Specications
Electromagnectic Compatibility: Complies with EMC standard
EN61326-1
IEC Standards: IEC 60945/61000-4-4, IEC 60945/61000-4-2
Input Voltage: 5 to 30 Vdc (below 5.3 V the measurement per-
formance for high wind speeds may be degraded)
Typical Current Drain @ 12 Vdc: 0.1 mA (SDI-12 standby); 3 mA
(Default Measuring Intervals)
Output: SDI-12
Operating Temperature Range: -52° to +60°C
Storage Temperature: -60° to +70°C
Operating Relative Humidity: 0 to 100% RH
Height: 23.8 cm (9.38 in)
Diameter: 11.5 cm (4.52 in)
Weight: ~ 650 g (1.43 lb)
Air Temperature
Measurement Range: -52° to +60°C
Accuracy: ±0.3°C @ +20°C
Output Resolution: 0.1°C
Barometric Pressure
Measurement Range: 600 to 1100 hPa
Accuracy
0 to 90% RH 90 to 100% RH
±3% RH ±5% RH
Output Resolution: 0.1% RH
Wind Speed
Measurement Range: 0 to 60 m s-1
Response Time: 0.25 s
Accuracy
0 to 35 m s-1 36 to 60 m s-1
±0.3 m s-1 or ±3% whichever is greater ±5%
Wind Direction
Measurement Range: 0° to 360°
Response Time: 0.25 s
Accuracy: ±3°
Output Resolution: 1°
Precipitationd
Rainfall Measurement: Cumulative accumulation after latest
automatic or manual reset
Collecting Area: 60 cm2
Field Accuracy for Daily Accumulation: Better than 5% (weath-
er dependent; does not include possible wind induced error)
Rain Duration: Counting each 10-s increment whenever drop-
let detected
Rain Intensity: 1-min. running average in 10-s steps
Rain Intensity Range: 0 to 200 mm hr-1 (broader range possible
with reduced accuracy)
Accessories
The WXT520 is shipped with a mounting tube that fastens to a
Campbell Scientic crossarm via the CM220 Right Angle Mounting
Bracket or 17953 1-in. x 1-in. NU-RAIL Fitting.
The 25299 is an optional mounting kit for the WXT520. It
provides better water protection. When using the 25299, the
WXT520’s IP classication is IP66; otherwise its classication is
IP65. The 25299 fastens to a crossarm via the CM220 bracket or
17953 NU-RAIL tting.
The 25300 Bird Spike Kitcis used to discourage birds from roosting
on the WXT520. This kit is fastened on top of the WXT520. It con-
sists of a metallic band with spikes pointing upward. The spikes’
shape and location ensure minimal interference of wind and rain
measurements. The spikes are designed not to hurt the birds.