The new Vaisala WXT-520 automatic weather transmitter contains all of the standard parameters of a weather station packed into a single, compact case. Parameters include air temperature, relative humidity, barometric pressure, wind speed and direction (using a top quality sensor), plus a revolutionary electronic precipitation gauge that can not only detect rain, but also its intensity - and even hail! With the parameter range and accuracy of this unit we believe it can't be bettered for the price.

The WXT-520 is an extremely flexible product. Many of the sensors parameters, like sampling slot time and sampling interval, can easily be programmed to adapt the sensors performance to a large variety of different applications. With it's extremely compact design it's very easy to install , and no moving parts makes it extremely easy to maintain.

Its low power consumption makes it a good match for an Adcon RTU, to which it is connected either directly (Series 4 RTUs: A723, A753, A755) or via the A506 SDI-12 interface (Series 3 RTUs: A723, A733).


  • Features
  • Specifications
  • Applications
  • Downloads
  • Essential weather parameters in cost efficient package
  • Measurement parameters are integrated into one multiparameter platform
  • Flexible selection measurement parameters available
  • Weather parameter hub having analog input options
  • Set of 3rd party analog sensors can be connected (T, S.R, Level, T.P.)
  • Digital interface incorporates also analog input parameters
  • Separate Data and Service ports
  • Analog output options
  • Wide variety of digital communication modes
  • Complies ISO60945 standard for maritime use
  • DNV certificate approval process on-going
  • Wide range of operating and heating voltages
  • Compact, light-weight
  • Easy to install
  • No moving parts
  • Configuration Tool for PC
  • Works also with solar panels
  • USB connectivity
  • IP66 housing with the mounting kit
  • Machine-to-machine interface

77Vaisala WXT520 Data Sheet (pdf 348 KB )


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)