Kipp&Zonen BSRN Scientific Solar Monitoring System - Manual (Page 49)

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Pyranometer Radius of
shading
disk/sphere
Arm length
required for
Eppley HF
Arm length
required for
Eppley NIP
Arm length
required for
Kipp and
Zonen CH1
Eppley PSP 25.4 635 605 510
Eppley 8-48 30 726 703 574
Kipp and Zonen
CM11 or CM21
25.4 630 603 505
Schenk Star 34 840 815 668
Table 4.1. Optim ized shade geom etry for com m on instrum ents. The optim ization considers solar
aureole conditions, solar elevation and instrum ent characteristics (courtesy of G . Major and M.
Putsay)
Figure 4.5. Australian active tracker used for both diffuse
and direct beam m easurem ents. This tracker is shading
a single pyranom eter, and pointing two norm al incidence
pyrheliom eters and a GAW PFR sunphotom eter on one
side of the tracker and another pyrheliom eter on the far
side of the tracker. An active-eye is also situated on the
far side of the tracker. (Courtesy Bureau of Meteorology,
Australia)