Todo en uno / WXT520
This product is no longer available and has been replaced by: CLIMAVUE50. Some accessories, replacement parts, or services may still be available.
WXT520 Weather Sensor
Services Available
Repair No
Calibration No
Free Support Yes


El sensor de tiempo meteorologico WXT520 fabricado por Vaisala mide direcciond y velocidad de viento, precipitacion, presion barometrica, temperatura y humedad relativa; todo en un solo dispositivo sin partes moviles. El WXT520 tiene una salida SDI-12 que puede ser leida por nuestros dataloggers ver tabal de compatibilidades). El sensor no es tan grande, lo que permite ser usado con nuestro pequeño datalogger CR200 en aplicaciones rapidas de corto plazo. Es importante resaltar que este sensor no esta diseñado para mediciones de grado cientifico o de investigacion. 

El sensor de viento del WXT520 consiste en 3 transductores equidistantes que producen una señal ultrasonica.

La precipitacion se mide por gota que al caer en el sensor, este produce una señal electrica que es proporcional al volumen de la gota.

El WXT520 tiene un modulo PTU que consiste en un capacitor de silicon BAROCAP® para la presion barometrica, un capacitor de ceramica THERMOCAP® para la temperatura del aire y un capacitor de polimero  HUMICAP® para humedad relativa. sor for relative humidity measurements. El modulo PTU tiene una protector de radiacion de respiracion natural.

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Benefits and Features

  • Low maintenance—no moving parts significantly reduces maintenance cost and time
  • Compact and lightweight
  • Low power consumption
  • Fast and simple to install
  • Outputs an SDI-12 signal that can be measured by many of our dataloggers
  • Combines the six most essential weather parameters in one instrument


Detailed Description

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.

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.

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 film polymer HUMICAP sensor for relative humidity measurements. The PTU is housed in a naturally-aspirated radiation shield that protects it and reflects solar radiation.


Electromagnetic 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 performance 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 Range -60° to +70°C
Operating Relative Humidity 0 to 100% RH
Diameter 11.5 cm (4.52 in.)
Height 23.8 cm (9.38 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
  • ±0.5 hPa (@ 0° to 30°C)
  • ±1 hPa (@ -52° to +60°C)
Output Resolution 0.1 hPa

Relative Humidity

Measurement Range 0 to 100% RH
  • ±3% RH (@ 0 to 90% RH)
  • ±5% RH (@ 90 to 100% RH)
Output Resolution 0.1% RH

Wind Speed

Measurement Range 0 to 60 m s-1
Response Time 0.25 s
  • ±0.3 m s-1 or ±3% whichever is greater (0 to 35 m s-1)
  • ±5% (36 to 60 m s-1)

Wind Direction

Measurement Range 0° to 360°
Response Time 0.25 s
Accuracy ±3°
Output Resolution


Rainfall Measurement Cumulative accumulation after latest automatic or manual reset
Collecting Area 60 cm2 (9.3 in.2)
Output Resolution 0.01 mm (0.001 in.)
Field Accuracy for Daily Accumulation Better than 5% (weather dependent; does not include possible wind induced error)
Rain Duration Counting each 10-s increment whenever droplet detected
Rain Intensity 1-min. running average in 10-s steps
Rain Intensity Range 0 to 200 mm h-1 (broader range possible with reduced accuracy)


Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.


Product Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR1000 (retired)
CR1000 (retired)
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR3000 (retired)
CR3000 (retired)
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR9000 (retired)
CR9000X (retired)


Product Compatible Note

Additional Compatibility Information


The WXT520 is shipped with a mounting tube. The mounting tube fastens to a CM202, CM204, or CM206 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 classification is IP66; otherwise its classification is IP65. The 25299 fastens to a crossarm via the CM220 bracket or 17953 NU-RAIL fitting.

Bird Spike Kit

The 25300 Bird Spike Kit is used to discourage birds from roosting on the WXT520. This kit is fastened on top of the WXT520. It consists of a metallic band with spikes pointing upward. The spike’s shape and location ensure minimal interference of wind and rain measurements. The spikes are designed not to hurt the birds. Please note that when the kit is attached to the WXT520, more snow can accumulate on the WXT520, and the snow may melt slower.