CSD 3 Sunshine Duration Sensor
CSD 3 measures sunshine duration. Sunshine duration is defined by WMO as the time during which the direct solar radiation exceeds the level of 120 W/m².
CSD 3 measures sunshine duration. Sunshine duration is defined by WMO as the time during which the direct solar radiation exceeds the level of 120 W/m².
It 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.
The humidity indicator shows clearly when a change of drying cartridge is necessary. A waterproof plug-and-socket cable connection for easy installation and servicing.
Gallery
CSD 3 Sunshine Duration Sensor
Technical data
| Spectral range | 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 %/ºC |
| Response time | < 1 m s |
| Power supply | 12 VDC |
