Pyrgeometers FOR THE PRECISE MEASUREMENT OF FAR INFRARED RADIATION Measure incoming thermal radiation from the sky and clouds Measure outgoing thermal radiation from the ground Used around the world in meteorology, hydrology and climate research Reliable all-weather performance Easily portable for eld use

Radiation from the sun is mainly in the ‘short-wave’ range from 300 to 4000 nm (4 µm) that includes the visible and ultraviolet. A proportion of this radiation is absorbed by clouds, aerosols and molecules in the atmosphere, which warms up and radiates ‘long-wave’ radiation. This is far infrared thermal energy (FIR) at wavelengths from 4.5 µm to beyond 40 µm. Both the shortwave and long-wave radiation reach the Earth, where some is reflected and the remainder warms up the surface. The Earth radiates long-wave thermal energy back to the sky. A pyrgeometer provides a voltage that is proportional...

CGR 4 is the best pyrgeometer currently available and is the choice for scientific use and in top level solar radiation monitoring networks such as the Baseline Surface Radiation Network (BSRN) of the World Meteorological Organisation. It is the partner for CMP 11, CMP 21 and CMP 22 pyranometers. CGR 4 has a specially designed silicon meniscus dome that provides a 180 ° field of view and has a hard-carbon coating on the outside to smooth the spectral response and provide extra surface protection. The detector is compensated for changes in sensitivity due to temperature variations. All pyrgeometers...

Non-stability (change/year) Window heating offset (with 1000 W/m² solar radiation) Temperature dependence of sensitivity Operating temperature Spectral range (50 % points) CGR instruments have a standard cable length of 10 m. Optional cable lengths 25 m and 50 m Standard 10 K Thermistor (YSI 44031) or optional Pt-100 temperature sensor Under most conditions the output from CGR pyrgeometers is negative and suitable data acquistion equipment must be used Note: The performance specications quoted are worst-case and/or maximum values Go to www.kippzonen.com for your local distributor HEAD OFFICE...