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:
| previously | ||
| 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).