Version 1001

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

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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

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

9Hukseflux solar concentrator sensors

10ISO 9060

11ISO 9060

Background

•Error function of:

•Characterisation / class

•Calibration

•Measurement & maintenance conditions

•Environmental conditions

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13ISO 9060

14ISO 9060

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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