The CGR 4 Pyrgeometer is intended for high accuracy infrared radiation (IR) measurement research, from 4.5 to 42 µm. The CGR 4 employs a unique solar blind ellipse shaped silicon dome, that offers a full 180 degree field of view, with good cosine response. The dome is hard carbon (diamond) coated, to protect from surface oxidation and scratching.
The dome ring assembly is specially engineered to deliver optimal thermal coupling between the dome, dome mounting ring, and instrument body. The excellent dome to body thermal coupling eliminates the need for the conventional dome thermistor and dT (delta-T) dome/body temperature offset calculation (as is the case with other competitive manufacturer pyrgeometer models), even under direct solar load conditions. The CGR 4 is therefore equipped with a single body thermistor, in addition to the instruments thermopile sensing element. To determine incoming sky or surface emitted IR, in W/m2 units, the output signal voltage of the CGR 4 sensing element, body temperature, and the factory supplied CGR 4 calibration coefficient, are all an integral components of the IR calculation.
Benefits
Easy set-up and operation (no dome thermistor)
Excellent dome/body thermal coupling
No batteries required
Suitable for shaded or non shaded operation
Compatible with Kipp & Zonen model CVF 3 Ventilator
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