• Indoor calibration
• Pyrgeometers calibration
• High accuracy
• Fits to CFR
Please note that there are currently no internationally agreed standards for the indoor calibration of pyrgeometers. The method used for Kipp & Zonen factory calibrations is replicated by the CFI. The procedure is similar to that used to calibrate pyranometers and albedometers with the CFR. The calibration transfer uncertainty between reference and test pyrgeometers is estimated to be ± 3-4%.
The CFI comprises an infrared hot-plate with a bracket for fitting to the CFR lamp mounting pillar, below the CFR calibration lamp. The hot-plate has a precise and stable temperature control unit, which is normally set at +60°C. A heat shield is fitted to the top of the CFR shading mechanism to prevent heat transfer in the ‘dark’ measurement mode.
The turntable supplied as standard with the CFR is suitable for calibration of CG 1, CG 4, CGR 3 and CGR 4 pyrgeometers. CFR is supplied without reference pyrgeometers. These should be purchased separately and be of similar characteristics to the field radiometers under test.