ISO 9847 is an international standard that defines procedures for calibrating pyranometers using reference solar radiation measurements.

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Most pyranometers should be recalibrated every one to two years, depending on environmental conditions and application requirements.

What is the main standard for pyranometer calibration?

The primary global pyranometer calibration standard is ISO 9847:2023, matched with WRR world radiation traceability and ISO 17025 laboratory qualification requirements.

What is the difference between ISO 9060 and ISO 9847 pyranometer standards?

ISO 9060 defines pyranometer performance grade classification, while ISO 9847 specifies the complete testing and operation of pyranometer calibration standards for data correction.

Is WRR traceability mandatory for official pyranometer calibration?

Yes, top-grade pyranometer calibration standards issued by WMO require all meteorological reference sensors with valid WRR traceable calibration data.

What error range is acceptable for calibrated field pyranometers?

Per pyranometer calibration standards, secondary field pyranometer allowable total error shall not exceed 5%; first-class standard pyranometer error shall be less than 2%.