Metal ring SHR02

SHR02 is a shadow ring, used in combination with a pyranometer to form a “diffusometer”. The ring will prevent direct radiation from reaching the pyranometer from sunrise to sunset, so that the shaded pyranometer measures diffuse radiation only. SHR02 is used with Hukx pyranometers such as SR30, SR25 and SR20. These models have very low zero offsets, leading to higher accuracy diffuse measurements than attained with competing models. Turn your pyranometer into a diffusometer SHR02 is a practical metal shadow ring that helps making diffuse solar irradiance measurements with pyranometers. The shadow ring, also known as a shadow band, prevents direct radiation from reaching the pyranometer. The combination of a shadow ring and a pyranometer is called a diffusometer by the ISO 9060:2018 standard. The compact SHR02, combined with a Hukx pyranometer, has several advantages over competing models. SHR02 is compatible with most Hukx pyranometers. Hukx pyranometers have very low zero offsets, so that the diffuse radiation measurement has a better uncertainty than that of competing pyranometer-shadow ring diffusometers. To avoid problems with dew and frost deposition, the user should consider using the heated SR25 or the heated and ventilated SR30 pyranometer. A diffuse horizontal irradiance (DHI) measurement with a pyranometer-shadow ring diffusometer is usually combined with a pyranometer-without a shadow ring. The latter measures the Global Horizontal Irradiance (GHI). Combining GHI and DHI with local solar position, the Direct Normal Irradiance (DNI) can be estimated. Most shadow rings are used with the pyranometer mounted horizontally.