ISO 9060 Solar energy

Specification and classification of instruments for measuring hemispherical solar and direct solar radiation

In the ISO 9060:2018 standard, solar radiation sensors (pyranometers) are classified in three classes:

Class A Secondary Standard for scientific measurement quality
Class B First Class for good measurement quality
Class C Second Class for medium measurement quality


The ISO 9060:2018 classification is accepted as well by the WMO (World Meteorological Organisation).