The Kipp and Zonen CSD3 sunshine duration sensor measures the amount of sunshine received during a day. Sunshine duration is defined by WMO as the time during which the direct solar radiation exceeds the level of 120 W/m².
The CSD3 has no moving parts and uses 3 photo-diodes with specially designed diffusers to make an analogue calculation of when it is sunny. The output is switched high or low to indicate sunny or not sunny conditions. The calculated direct irradiance value is also available.
CSD 3 operates from 12 VDC power and has built-in heaters to dissipate rain, snow, and frost. These are normally switched externally but an optional internal thermostat control is available.
Sunshine duration sensors have come a long way since the Cambell Stokes Sunshine Duration Recorder. Thankfully the accuracy and reliability of the Kipp and Zonen CSD3 are far superior, not to mention easier to use and maintain.
|Spectral range (overall)||400 to 1100 nm|
|Operational temperature range||-40 to +70 °C|
|Sunshine signal||1 ±0.1 V (direct radiation > 120 W/m²)|
|Accuracy||> 90% (monthly sunshine hours)|
|Accuracy||> 90% (direct signal for clear sky)|
|Analogue output signal||1 mV/Wm²|
|Non-stability (change/year)||< 2 %|
|Temperature response||< 0.1|
|Response time||< 1 m s|
|Power supply||12 VDC|