• 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 Confi guration Tool for pc
• USB connection
• IP66 housing with mounting kit WXT520

The Vaisala Weather Transmitter 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.

Technical Specifications WXT 520

Wind speed

Speed
Measurement range	0 … 60 m/s
Accuracy 0 … 35 m/s	±0.3 m/s or ±3%, whichever is greater
Accuracy 36 … 60 m/s	±5%
Direction
Measurement range	0 … 360°
Accuracy	±3°
Response time	250 ms

Liquid precipitation

Rainfall: cumulative accumulation after latest automatic or manual reset
Output Resolution	0.01 mm, 0.001 inches
Accuracy	5%*
Rainfall duration: counting each ten-second increment when droplet detected
Output Resolution	10 s
Rain Intensity: one-minute running average in ten-second steps
Range	0 … 200 mm/h (broader range with reduced accuracy)
Output Resolution	0.1 mm/h, 0.01 inches/h

The unit above also includes a solar radiation sensor for ET calculations. The WXT520 is connected to the MAIT data logger with 3G modem for remote access to data via the internet.

Barometric pressure

Measurement Range	600 … 1100 hPa
Accuracy	±0.5 hPa at 0 … 30 °C (+32 … +86 °F) ±1 hPa at -52 … +60 °C (-60 … +140 °F)

Air temperature

Measurement Range	-52 … +60 °C (-60 … +140 °F)
Accuracy at +20 °C(+68°F)	±0.3 °C (±0.5 °F)

Relative humidity

Measurement Range	0 … 100 %RH
Accuracy	±3 %RH within 0 … 90 %RH ±5 %RH within 90 … 100 %RH

General

Operating Temperature	-52 … +60 °C (-60 … +140 °F)
Storage Temperature	-60 … +70 °C (-76 … +158 °F)
Input Voltage	5 … 32 VDC
Typical Power Consumption	3 mA at 12 VDC (with defaults)
Heating Voltage	5 … 32 VDC (or AC, max. 30 VRMS)
Serial Data Interface	SDI-12, RS232, RS485, RS422, USB adapter
Housing	IP65
Housing with Mounting Kit	IP66
Electromagnetic Compatibility	complies with EMC standard EN61326-1; Industrial Environment
IEC Standards	IEC 60945/61000-4-2 … 61000-4-6

* Due to the nature of the phenomenon, deviations caused by spatial variations may exist in precipitation readings, especially in short time scale. The accuracy specification does not include possible wind induced error.