The SA02 is a sonic anemometer for wind speed and wind direction. Ultrasonic pulses travel between the sensing heads, and the wind changes how long they take. The SA02 turns that difference into speed and direction. It can be mounted separately from other sensors, at a higher elevation, following WMO recommendations. It connects to a SpaceEcho station and reports to EchoCloud.
SA02 mounted on a mast (illustration).
Features
Sound-based measurement
Wind is calculated from ultrasonic travel time.
Separate mounting
Fit it at the height the measurement needs, apart from the other weather sensors.
Two mounting options
Sleeve-fixed or flange-adapter-fixed, on a 1.5 m or 3 m flange or a 1.8 m tripod.
Corrosion-resistant build
Polyacetal and clear-anodised aluminium.
Specifications
Parameter
Principle
Range
Resolution
Accuracy
Wind speed
Ultrasonic
0–40 m/s
0.1 m/s
±1 m/s or ±4 %
Wind direction
Ultrasonic
0–360°
1°
±2° at wind speeds ≥ 3 m/s; ±4° at wind speeds < 3 m/s
Operating temperature
−15–55 °C
Material
Polyacetal and clear-anodised aluminium
Fixing
Sleeve-fixed or flange-adapter-fixed
Mounting frame
1.5 m, 3 m flange, 1.8 m tripod
Output interface
Analog; digital Modbus RS-485
Supply voltage
12–36 V DC
Choosing between a combined unit and separate sensors
Wind, temperature and humidity can be measured in one unit or with separate sensors.
Combined — MET05
Wind speed and direction, temperature, humidity and pressure in one housing, on one mounting point. Wind accuracy ±0.3 m/s over 0–30 m/s. Limit: all parameters are measured at the same height. See the Meteorological Unit.
Separate — SA02 and TDV02
The SA02 measures wind and the Ambient Sensor measures temperature and humidity, each placed at the height its measurement needs, following WMO recommendations. Limits: more devices to mount and wire, and the SA02 accuracy is ±1 m/s or ±4 %.
