The SEM404 is a bucket rain gauge for measuring rainfall at weather and hydrological stations. It connects to a SpaceEcho station and reports to EchoCloud.
A different principle from the Radar Rainfall Sensor, so the two can be installed side by side.
Specifications
Measuring range
0–4 mm/min
Drop size range
0.5–5.0 mm
Accuracy
±3 %
Cutting-edge acute angle
40–45°
Output interface
Analog; digital Modbus RS-485
Supply voltage
12–36 V DC
Choosing a rain sensor
Two sensors measure rainfall on a SpaceEcho station. They work on different principles, and some sites use both.
Radar — SEMR226
No moving parts, so it needs little maintenance. It reports rain, snow or hail, and detects the start and end of rain faster than a mechanical gauge. Range 0.01–200 mm/h, accuracy ±10 % of the value for liquid precipitation. Limit: a wider error than the bucket gauge. See the Radar Rainfall Sensor.
Bucket — SEM404
Accuracy of ±3 % over 0–4 mm/min, from collected rainfall. Limits: it does not report the type of precipitation, and the collector needs regular cleaning.
