Version 1001 Standardisation of “methods for testing” characteristics of pyranometers and pyrheliometers.

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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