SHR02
Shadow ring for pyranometers, combined with a pyranometer forming a diffusometer
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- turn pyranometer into diffusometer
- low-investment alternative for sun tracker with shading-disc
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 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 pyranometer into diffusometer
- low-investment alternative for sun tracker with shading-disc
Specifications
| function | forming a diffusometer when combined with a pyranometer |
| diffusometer measurand | diffuse solar radiation in W/m² |
| instrument compatibility | SR30, SR15 pyranometers (recommended) |
| instrument compatibility | SR25, SR22, SR20 pyranometers (with optional mounting adapter) |
| diffusometer zero offset a | with SR30: 2 W/m², with SR25: 1 W/m², with SR20: 5 W/m², with SR15: 5 W/m² |
| use with heating | with SR30 and SR25 |
| use with ventilation | with SR30 |
| ring inner diameter | 476 x 10⁻³ m |
All specifications
| function | forming a diffusometer when combined with a pyranometer |
| diffusometer measurand | diffuse solar radiation in W/m² |
| instrument compatibility | SR30, SR15 pyranometers (recommended) |
| instrument compatibility | SR25, SR22, SR20 pyranometers (with optional mounting adapter) |
| diffusometer zero offset a | with SR30: 2 W/m², with SR25: 1 W/m², with SR20: 5 W/m², with SR15: 5 W/m² |
| use with heating | with SR30 and SR25 |
| use with ventilation | with SR30 |
| ring inner diameter | 476 x 10⁻³ m |
| ring profile | U-profile |
| weight | 3.75 kg |
| ring width/radius ratio | 0.185 |
| field of view angle | 10.6 ° |
| material | anodized aluminium |
| rated operating temperature range | -40 to +80 °C |
| pyranometer tilt angle range | -90 to 90 ° |
| bubble level | included |
| leveling screws | included |
| required adjustment interval | according to adjustment table |
| application of correction factors | user responsibility |
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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. The incorporated tilt adjustment stage enables the diffuse irradiance to be measured in a tilted plane. To correct for the changing altitude of the sun, the height of the ring is adjusted manually by adjusting the sliding bars.
Advantages of SHR02
- relatively small size / light weight
- low-investment alternative for a sun tracker with shading-disc
- high accuracy when used with Hukx (low zero-offset) pyranometers
- save costs on expensive external ventilation; compatible with SR30 with internal ventilation
Suggested use
- meteorological observations
- building energy performance
- solar energy studies
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. Hukx 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 manual a set-up table with required correction factors for the measured diffuse radiation is provided, for a range of latitudes and declinations. The manual also provides theory for creating individual models when higher accuracy is required.
Compatible pyranometers
Preferred pyranometers SR15, SR30.
With mounting adapter also models SR20, SR22 and SR25.
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