This is a solar radiation meter classified as a Secondary Standard according to ISO 9060. It is a high-precision solar radiation meter designed for precise measurements, such as investigations into global warming.
This device measures the total solar radiation entering from the sky and is a high-precision all-weather solarimeter that complies with the Secondary Standard as defined by ISO 9060. The sensing element uses a thermopile with uniform spectral sensitivity across the entire wavelength range of solar radiation and stable performance. The MS-802 model features a new thermopile that has approximately doubled the response speed compared to the previous model (MS-801), and the temperature characteristics have been improved by about 40% through changes in the thermal structure. Additionally, the sensing surface is protected from variations in factors other than solar radiation (such as wind) by being covered with a double dome. The MS-802F has a fan installed at the bottom of the sensing surface holder, which blows air to the outside of the glass dome, preventing the accumulation of frost, snow, dust, and other debris.