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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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standardisation of methods for testing characteristics of pyranometers and pyrheliometers

Standardisation of “methods for testing” characteristics of pyranometers and pyrheliometers

main points
Main points
  • Classification standard ISO 9060
  • Missing: Standard for testing instrument characteristics
  • Problem: confusion (freedom)
  • Problem: solar energy industry!!
  • Solution: Maintenance
conclusion
Conclusion
  • List of points of attention
  • Indoor & “worst case” testing
  • Reactivation of ISO TC180
  • Volunteers
myself
Myself
  • Kees VAN DEN BOS
  • Engineer Physics
  • Director / owner Hukseflux Thermal Sensors
  • Last 20 years sensor design
hukseflux sr11 pyranometer
Founded 1993

Thermal sensors

15 employees

5 radiometry

compensation pyrheliometer

Hukseflux SR11 pyranometer
background
Background
  • Error function of:
  • Characterisation / class
  • Calibration
  • Measurement & maintenance conditions
  • Environmental conditions
background1
Background
  • Consultation of manufacturers
  • Consultation of ISO TC180
  • New “testing” (of characteristics) standard
  • Revision of ISO 9060
new testing standard
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
Revision ISO 9060
  • Reference conditions:
  • Horizontal
  • 500 W/m2
  • Normal Incidence
  • 20 degrees C
revision iso 90601
Revision ISO 9060
  • Zero-offset A (larger!!, ventilated/ heated)
  • Non-Linearity (horizontal)
  • Sprectral selectivity (larger!!)
  • Directional error (separation from non-linearity)
revision iso 90602
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
Miscellaneous
  • WMO mistake: confuses characterisation and errors due to calibration & conditions
  • WMO mistake: enters resolution
  • Ignore WMO?
  • Maintenance of ISO standards covering calibration.
conclusion1
Conclusion
  • List of points of attention (new standard + ISO9060)
  • Indoor & “worst case” testing (GUM / ventilation)
  • Reactivation of ISO TC180
  • Volunteers
slide22
P. S.
  • Memo available via server
  • Possible cooperation with EU sponsoring