The CGR3 pyrgeometer from Kipp and Zonen is designed for meteorological measurements of downward atmospheric longwave radiation.
The CGR3 provides a voltage that is proportional to the net radiation in the far-infrared (FIR). Downward atmospheric longwave radiation is derived by calculation. For this reason, CGR3 pyrgeometer embodies a temperature sensor.
The CGR3 uses a specially designed silicon window. On the inside, a solar-blind filter blocks solar radiation. The CGR3 data represents the radiation exchange within the whole hemisphere. This is because the reference CGR3 is calibrated outdoors with respect to a reference CG4, which has a 180 degrees field of view.
|Spectral range (50% points)||4.5 to 42 µm = 4500 to 42000 nm|
|Sensitivity||5 to 15 µV/W/m²|
|Response time||< 18 s|
|Window heating offset||< 15 W/m²|
|Zero offset B||< 4 W/m²|
|Temperature dependence of sensitivity (-10 ºC to +40 ºC)||< 5 %|
|Operational temperature range||-40 to +80 °C|
|Net irradiance range||-250 to +250 W/m²|
|Field of view||150 °|
|Non-linearity||< 1 %|
Like Kipp and Zonen pyranometers the CGR3 pyrgeometers can be mounted onto the mounting CMF or CFM4 mounting plates. Which plate will be determined whether the sensor will be ventilated or not. Two sensors can be mounted back to back on the plates to form an albedometer.
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