version 1001 standardisation of “methods for testing” characteristics of pyranometers and...
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Version 1001
Standardisation of “methods for testing” characteristics of pyranometers and
pyrheliometers
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Main points
•Classification standard ISO 9060
•Missing: Standard for testing instrument characteristics
•Problem: confusion (freedom)
•Problem: solar energy industry!!
•Solution: Maintenance
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Conclusion
• List of points of attention
• Indoor & “worst case” testing
•Reactivation of ISO TC180
•Volunteers
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Myself
•Kees VAN DEN BOS
•Engineer Physics
•Director / owner Hukseflux Thermal Sensors
• Last 20 years sensor design
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5Hukseflux 2010
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Hukseflux international
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Hukseflux SR11 pyranometer
• Founded 1993
• Thermal sensors
• 15 employees
• 5 radiometry
• compensation pyrheliometer
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8Urban Climate monitoring
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9Hukseflux solar concentrator sensors
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10ISO 9060
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11ISO 9060
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Background
•Error function of:
•Characterisation / class
•Calibration
•Measurement & maintenance conditions
•Environmental conditions
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13ISO 9060
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14ISO 9060
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Background
•Consultation of manufacturers
•Consultation of ISO TC180
•New “testing” (of characteristics) standard
•Revision of ISO 9060
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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)
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Revision ISO 9060
•Reference conditions:
•Horizontal
•500 W/m2
•Normal Incidence
•20 degrees C
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Revision ISO 9060
•Zero-offset A (larger!!, ventilated/ heated)
•Non-Linearity (horizontal)
•Sprectral selectivity (larger!!)
•Directional error (separation from non-linearity)
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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
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Miscellaneous
•WMO mistake: confuses characterisation and errors due to calibration & conditions
•WMO mistake: enters resolution
• Ignore WMO?
•Maintenance of ISO standards covering calibration.
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Conclusion
• List of points of attention (new standard + ISO9060)
• Indoor & “worst case” testing (GUM / ventilation)
•Reactivation of ISO TC180
•Volunteers
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P. S.
•Memo available via server
•Possible cooperation with EU sponsoring
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