Pyrheliometers are used to measure the Direct irradiance emitted by the sun in a 5 degree angle. The ISO9060 First Class MS-56 is a research grade normal incidence direct solar irradiance sensor also known as a pyrheliometer or DNI sensor which highly suitable for routine operation on automated Sun Tracker. The all-weather MS-56 is sensitive to solar irradiance throughout the spectral range 200 to 4,000nm and can work under most extreme conditions in a temperature range from -40°C to +80°C.
In principle to perform high precision direct solar radiation measurements under non stable atmospheric conditions ideally a fast responding detector is required to detect quick radiation changes. Although photo diode type detector offer a quick response but have a limited spectral sensitive range, in contrary thermopile broad band detectors cover the full spectral range however considered to be slow. The versatile MS-56 combines all those features of a quick broadband detector enabled by a advanced thermopile detector.