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The world standard for measuring solar irradiance.

Pyranometers have been the world standard for measuring solar irradiance for over 80 years and they follow specifications and classification defined by the World Meteorological Organization (WMO) and the International Standards Organization (ISO). Our range of pyranometers also covers every ISO9060 class, meeting or exceeding performances specifications.


Whether your goal is true plant performance monitoring, solar resource prospecting or material testing, adhering to the world standard reliability of your data. Data from pyranometers are also comparable with data from available solar atlases.

Advanced features

  • ISO 9060 Secondary Standard, First Class, Second Class pyranometers

  • Compliant with WMO and ISO specifications

  • Acknowledged by IEC 61724 for outdoor PV monitoring

  • Adherence to world standards bankability of data

  • Flat spectral response: PV-technology independent

  • Very low-temperature dependency

  • Very low directional error: Suitable for both horizontal and tilted installation (plane-of-array)

  • Low uncertainty of data


Pyranometer vs. Reference Cell
 Which technology is better suited for your application?

*RC = Reference Cell; P=Pyranometer

Performance monitoring

RC: Measures available solar radiation used by cells of identical material and packaging (window).

P: Measures total available solar energy – the data needed for real performance ratio determination.

Solar prospecting

RC: Measurements from different sites are not comparable without spectral correction.

P: Data is comparable with any location and with available solar at lases.


Outdoor monitoring

RC: Originally designed for indoor use, needs correction for Air Mass, temperature, cell mismatch, local weather (spectral correction).

P: The standard for outdoor solar monitoring for over 80 years, universally applicable without correction.



RC: Not suitable to evaluate module performance decay over time as stability is often not declared.

P: Stability is defined by ISO9060.


Directional error

RC: The flat cover reflects a good part of incident irradiance, leading to substantial underestimation. Cannot be used in horizontal position.

P: Hemispheric domes allow transmission of irradiance from every direction.

Suitable for installation at different tilt angles.



Second class pyranometer prices are comparable with good quality reference cells.

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