CSD3

The CSD3 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.

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CSD3

Key features

  • Waterproof plug-and-socket cable connection for easy installation and servicing
  • 5 year warranty (*)
  • Humidity indicator to show when a change of drying cartridge is necessary

It has no moving parts and uses three 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. CSD3 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. The larger screw on drying cartridge is easier to change at extended intervals.

(*) This product will need to be registered by the end-user within 6 months of purchase to activate the 5 year warranty.

Technical specification

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

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