Kipp&Zonen BSRN Scientific Solar Monitoring System User Manual
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128
Pyranom eter
Radius of shading
disk/sphere
Arm length
to fit to HF
Arm length
to fit to CH-1
Arm length
to fit to NIP
CM 11 or 21
25.4
630
603
505
EPPLEY PSP
25.4
635
605
510
EPPLEY 8-48
30
726
703
574
SCHENK Star
34
840
815
668
T able C 3.6. Optim al geom etric param eters (m m ) of diffusom eter for the considered
pyranom eter- pyrheliom eter pairs.
C 3.3
References
Major, G. 1992: Estim ation of the Error Caused by the Circum solar Radiation when Measuring Global
Radiation as a sum of Direct and Diffuse Radiation. Solar Energy, 48.
Major, G. 1994: Circum solar Correction for Pyrheliom eters and Diffusom eters. W MO/TD-No. 635
Major, G. 1995: The role of geom etry in the com parison of standard Pyrheliom eters. Idojaras, 99, No. 2.