We advise recalibration of radiometers every two years.
CFR offers a solution for quality control of the stability of the pyranometers that are used in a network. The CFR is designed for the calibration of pyranometers, using a reference pyranometer as a comparison.
For customers who have a large number of pyranometers and/or albedometers, or who maintain a network of instruments, regular re-calibration in Delft creates down-time and requires logistical effort.
The CFR complies with the ISO 9847 international standard, resulting in a high accuracy calibration.