Assembled from the most accurate individual sensors, the result is a high precision smart sensor and not just one device for all purposes. For different applications we have different combinations of the individual sensors.
Relative humidity is measured by means of a capacitive sensor element. The air temperature is captured by a precision NTC measuring element. Both sensors are integrated in an artificial ventilated radiation shield.
The air pressure is measured with an MEMS (micro electro mechanical system) sensor.
Ultrasonic sensor technology is used to take wind measurements. The integrated electronic compass can be used to check the north – south adjustment of the sensor housing for wind direction measurement. It is also used to calculate the compass corrected wind direction.
Radar technology is used to measure precipitation. The precipitation sensor works with a 24GHz Doppler radar, which measures the drop size and speed of every single drop (rain/snow) and calculates precipitation quantity and type by correlating drop size and speed. WS401-UMB and WS601-UMB are using an unheated rain gauge for precipitation measurement.
Optionally, the WS601-UMB and WS401-UMB can be equipped with a leaf wetness sensor in addition.
The global radiation is measured by a special adopted CMP3 pyranometer from Kipp&Zonen mounted in the top cover of the compact weather station WS501-UMB and WS301-UMB. Models WS502-UMB and WS302-UMB are equipped with a silicon pyranometer with very short response time.
All compact weather stations are equipped with a digital UMB (Universal Measurement Bus) output which corresponds electronically to an RS482, two wires, half duplex. The measurement output can be accessed by the following protocols: UMB-binary, UMB-ASCII as well as SDI-12 and Modbus.
