CSD3 Sunshine Duration Sensor by Kipp&Zonen

The CSD3 sunshine duration sensor requires very little maintenance and is easy to install and operate. Utilising decades of experience the Kipp and Zonen CSD3 sunshine sensor will accurately record sunshine many years into the future.

  • 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

For pricing and further information, you can contact ESS Earth Sciences direct via our contact form or through the product enquiry button below. We aim to respond to all requests within 4 business hours.


The CSD3 sunshine duration sensor accurately records periods when the direct solar radiation exceeds the 120 W/m²- threshold defined by the WMO. These periods can be defined as having sunshine, periods below this threshold do not technically have sunshine.

The CSD3 sunshine duration sensor has no moving parts, using 3 photo-diodes with specially designed diffusers to make an analogue calculation of when it is sunny. The calculated direct irradiance value is also available. CSD3 sunshine duration sensor operates from 12 VDC power and has built-in heaters to dissipate rain, snow, and frost. These are normally switched externally but there is the option of an internal thermostat if required.

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 the drying cartridge is easier to change at extended intervals.

CSD3 Sunshine sensor installation

Due to the innovative design of the CSD3 sensor, there is no requirement for it to be fitted to a sun tracking device, the sensor can be fixed in a permanent position to record sunshine.

For detail on how to install the CSD3 please review Kipp and Zonen’s instructional video below.

CSD3 Specifications

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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