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
2
Conclusion
• List of points of attention
• Indoor & “worst case” testing
•Reactivation of ISO TC180
•Volunteers
3
Myself
•Kees VAN DEN BOS
•Engineer Physics
•Director / owner Hukseflux Thermal Sensors
• Last 20 years sensor design
4
5Hukseflux 2010
Hukseflux international
6
Hukseflux SR11 pyranometer
• Founded 1993
• Thermal sensors
• 15 employees
• 5 radiometry
• compensation pyrheliometer
7
8Urban Climate monitoring
9Hukseflux solar concentrator sensors
10ISO 9060
11ISO 9060
Background
•Error function of:
•Characterisation / class
•Calibration
•Measurement & maintenance conditions
•Environmental conditions
12
13ISO 9060
14ISO 9060
Background
•Consultation of manufacturers
•Consultation of ISO TC180
•New “testing” (of characteristics) standard
•Revision of ISO 9060
15
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)
16
Revision ISO 9060
•Reference conditions:
•Horizontal
•500 W/m2
•Normal Incidence
•20 degrees C
17
Revision ISO 9060
•Zero-offset A (larger!!, ventilated/ heated)
•Non-Linearity (horizontal)
•Sprectral selectivity (larger!!)
•Directional error (separation from non-linearity)
18
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
19
Miscellaneous
•WMO mistake: confuses characterisation and errors due to calibration & conditions
•WMO mistake: enters resolution
• Ignore WMO?
•Maintenance of ISO standards covering calibration.
20
Conclusion
• List of points of attention (new standard + ISO9060)
• Indoor & “worst case” testing (GUM / ventilation)
•Reactivation of ISO TC180
•Volunteers
21
P. S.
•Memo available via server
•Possible cooperation with EU sponsoring
22
Top Related