Sunshine Duration Sensor

Main features :

Waterproof plug-and-socket cable connection
Easy installation and servicing
Humidity indicator
Easy to change drying cartridge
Glass tube for improved resistance to scratching
Extended operating temperature range

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 non-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. There is a waterproof plug-and-socket cable connection for easy installation and servicing. The large screw-on drying cartridge allows an exchange at extended intervals.

Specifications

Spectral range (overall)	400 to 1100 nm
Operational temperature range	-40°C to +70°C
Sunshine signal	1 ±0,1 V (direct radiation > 120 W/m²)
Accuracy	> 90% (monthly sunshine hours) / > 90% (direct signal for clear sky)
Analogue output signal	1 mV/Wm²
Non-stability (change/year)	< 2 %
Temperature response	< 0,1 %
Response time	< 1 ms
Power supply	12 VDC