Kipp&Zonen CGR 4 Pyrgeometers - Manual (Page 14)

For the CGR 4 the effect of each parameter on the sensitivity can be shown separately. The non-linearity
error, the sensitivity variation with irradiance, is the same for any CGR 4 and is shown in Figure 8.
Figure 8: Non-linear sensitivity variation with irradiance of a CGR 4 pyrgeometer
The temperature dependence of the sensitivity is a function of the individual CGR 4. For a given CGR 4 the
response lies in the region between the curved lines in Figure 9. The temperature dependence of each CGR
4 pyrgeometer is characterised and supplied with the instrument. Each CGR 4 has a built-in temperature
sensor to allow corrections to be applied if required.
Figure 9: Typical temperature dependency of a CGR 4
Page 14 CGR 4 Manual