Sensor for duration of sunshine CSD3

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. The larger screw on drying cartridge is easier to change at extended intervals. A waterproof plug-and-socket cable connection for easy installation and servicing. 

For measuring of sunshine duration and direct solar irradiance. Consist of precision glas cylinder, three special photodiaods with diffusor and anodised aluminium case.
measuring range	sunshine duration yes/no (direct irradiance >120 W7m²) direct irradiance: 0...1000 W/m²
spectral range	400...1100 nm
response time (95%)	1ms
accuracy	± 10 % (over one day)
temperature dependece	0.1 %/K
output	0V no sunshine and 1 V for sunshine direct irradiance 0...1V for 0...1000W/m²
operating temperature	-40...70°C
dimensions	ø 72.5mm; 131 x 294 mm
weight	ca. 0,9 kg (without cable)