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. Sunshine Duration Sensors are widely used in weather networks to provide the number of sunshine hours per day for tourist information. In agriculture the CSD 3 monitors the amount of sunshine received by crops.In building automation the CSD 3 can be used to automate the control of sun blinds.
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.
Waterproof plug-and-socket cable connection for easy installation and servicing
Humidity indicator to show when a change of drying cartridge is necessary
Larger capacity drying cartridge that is easier to change at reduced intervals Glass tube, for improved resistance to scratching by storm-blown sand and ice
Operating temperature range extended, -40 ºC to +70 ºC
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