Pyrgeometer for research applications IR20 & IR20WS

IR20 is a research-grade pyrgeometer suitable for high-accuracy longwave irradiance measurement in meteorological applications. Thanks to Hukx’s technological innovation, IR20 is offered at a significantly lower price level than competing models of the same performance level. IR20 is capable of measuring during both day and night. In absence of solar radiation, model IR20WS offers even better accuracy because of its wider spectral range. IR20 and IR20WS research-grade pyrgeometers IR20 measures the longwave or far-infrared radiation (FIR) received by a plane surface, in W/m2, from a 180 ° field of view angle. In meteorological terms, pyrgeometers measure “downward and upward longwave irradiance” (WMO definition). Longwave radiation refers to the portion of atmospheric radiation that is not emitted by the sun. While the spectral range of longwave radiation is not standardized, a practical cut-on is in the range of 4 to 5 x 10-6 m. IR20 features a dome with a solar-blind filter with a cut-on at 4.5 x 10-6 m, making it suitable for both day and night observations. Model IR20WS has a wide spectral range with a cut-on at 1.0 x 10-6 m. It offers superior accuracy during nighttime, when solar radiation is absent. IR20 Pyrgeometer benefits breakthrough pricing for a pyrgeometer of this performance level as a result of Hukx's technological innovation. correction of temperature dependence by use of the measurement function. This is far more accurate than temperature compensation in the instrument, especially at very low and high temperatures. Every pyrgeometer is supplied with temperature coefficients to enter into the equation.