The 240-8101 Star Pyranometer is a basic instrument for measuring direct and diffuse solar radiation (global radiation). The sensing element is composed of 12 wedge-shaped, thin copper sectors arranged radially, 6 white alternating with 6 black. Six chromel-constantan thermocouples are embedded in each sector to produce a 72 junction thermopile. Output from the thermopile is approximately 15µV/Wm².
