SHR02 shadow ring
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Thermal Sensors Shadow ring for pyranometers – combined with a pyranometer forming a diffusometer 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 Hukseflux pyranometers such as SR30 and SR20. These models have very low zero offsets, leading to higher accuracy diffuse measurements than attained with competing models. Introduction 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 Hukseflux pyranometer, has several advantages over competing models. Figure 1 SHR02 shadow ring for pyranometers (a pyranometer is not included in SHR02 delivery) SHR02 is compatible with most Hukseflux pyranometers. Hukseflux 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. The incorporated tilt adjustment stage enables the diffuse irradiance to be measured in a tilted plane. The height of the ring is adjusted manually by adjusting the sliding bars to correct for the changing altitude of the sun. Advantages of SHR02   Figure 2 installation of the compact SHR02 shadow ring and a Hukseflux pyranometer is easy. When combined, a diffusometer is created, in which the shaded pyranometer measures diffuse radiation only. relatively small size / light weight low-investment alternative for a sun tracker with shading-disc high accuracy when used with Hukseflux (low zero-offset) pyranometers save costs on expensive external ventilation; compatible with SR30 with internal ventilation Copyright by Hukseflux. Version 1801. We reserve the right to change specifications witho ut prior notice Page 1/2. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hu

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Thermal Sensors meteorological observations building energy performance solar energy studies Diffusometer measurand Setup and accuracy The altitude of the sun varies throughout the year and this influences the shadow cast by the shadow ring. Aside from adjusting the shadow ring on a regular basis to compensate for this, it should be taken into account that part of the diffuse radiation obscured by the shadow ring will change. Hukseflux provides a specifically tuned model that will aid the user in setting up the SHR02 without the need for in-depth knowledge of diffusometers. In the SHR02...

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