Standardisation of “methods for testing” characteristics of pyranometers and pyrheliometers
Main points Classification standard ISO 9060 Missing: Standard for testing instrument characteristics Problem: confusion (freedom) Problem: solar energy industry!! Solution: Maintenance
Conclusion List of points of attention Indoor & “worst case” testing Reactivation of ISO TC180 Volunteers
Myself Kees VAN DEN BOS Engineer Physics Director / owner Hukseflux Thermal Sensors Last 20 years sensor design
Hukseflux 2010
Hukseflux international
Hukseflux SR11 pyranometer Founded 1993 Thermal sensors 15 employees 5 radiometry compensation pyrheliometer Hukseflux SR11 pyranometer
Urban Climate monitoring
Hukseflux solar concentrator sensors
ISO 9060
ISO 9060
Background Error function of: Characterisation / class Calibration Measurement & maintenance conditions Environmental conditions
ISO 9060
ISO 9060
Background Consultation of manufacturers Consultation of ISO TC180 New “testing” (of characteristics) standard Revision of ISO 9060
New testing standard Based on indoor experiments Connection with ISO 98-3 GUM: “Worst case” as found in real outdoor conditions Under non-ventilated conditions for non-ventilated instruments (heated conditions for heated instruments etc)
Revision ISO 9060 Reference conditions: Horizontal 500 W/m2 Normal Incidence 20 degrees C
Revision ISO 9060 Zero-offset A (larger!!, ventilated/ heated) Non-Linearity (horizontal) Sprectral selectivity (larger!!) Directional error (separation from non-linearity)
Revision ISO 9060 Requirements for secondary standard Now: comply on all specifications Future: Non-linearity, tilt response, spectral by group compliance Future: Non-Stability: not included
Miscellaneous WMO mistake: confuses characterisation and errors due to calibration & conditions WMO mistake: enters resolution Ignore WMO? Maintenance of ISO standards covering calibration.
Conclusion List of points of attention (new standard + ISO9060) Indoor & “worst case” testing (GUM / ventilation) Reactivation of ISO TC180 Volunteers
P. S. Memo available via server Possible cooperation with EU sponsoring