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CM 121 B/C Shadow Ring - Brochure0 pages
CM 121 Shadow Ring
for the measurement of diuse radiation
Suitable for all latitudes and surfaces in the tilted North-South plane
Compatible with all CMP/SMP series pyranometers, CGR pyrgeometers and CUV 5 UV radiometer
View angle of 10.6 °
CM 121 is a shadow ring that does not require power and can be used with all the Kipp & Zonen CMP, SMP, CGR and CUV series
of instruments. It is used for measurements of the diuse sky radiation or to shade a pyrgeometer from the direct solar radiation.
CM 121B is for unventilated radiometers and CM 121C is for ventilated instruments.
The radiometer is installed on the mounting pedestal and after levelling and correct adjustment for the location and the sun
declination the ring makes a shadow on the radiometer dome throughout the day. To maintain the shading accuracy it is necessary
to adjust the position of the ring every few days to compensate for changes in the solar arc.
