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PAYMENT METHODS
Secondary standard pyranometer with quartz domes - extended spectral range
SR22 is a solar radiation sensor of the highest category in the ISO 9060 classification system: secondary standard. On top of the features and benefits of the successful SR20 pyranometer, SR22 has domes made of high-quality quartz, resulting in an extended spectral range. Covering the full solar spectrum, SR22’s extended spectral range potentially offers lower measurement- and calibration uncertainties compared to pyranometers with glass domes. SR22 is typically used in high-accuracy climatological networks.
| Measurand | hemispherical solar radiation |
| ISO 9060:2018 classification | spectrally flat Class A pyranometer |
| ISO 9060:1990 classification | secondary standard pyranometer |
| IEC 61724-1:2021 compliance | Class A (when used with VU01) |
| Application | National Meteorological Networks,meteorology / climatology,other |
| Heater | yes |
| Calibration uncertainty | < 1.7 % (k = 2) |
| Zero offset a | 5 W/m² unventilated and 2.5 W/m² ventilated |
| Calibration traceability | to WRR |
| Spectral range | 190 to 4000 x 10⁻⁹ m |
| Spectral selectivity | < ± 2 % (0.35 to 1.5 x 10⁻⁶ m) |
| Sensitivity (nominal) | 15 x 10⁻⁶ V/(W/m²) |
| Rated operating temperature range | 40 to +80 °C range |
| Temperature response | < ± 1 % (-10 to +40 °C) and < ± 0.4 % (-30 to +50 °C) with correction in dataprocessing |
| Temperature response test of individual instrument | report included |
| Directional response test of individual instrument | report included to 95 ° |
| Temperature sensor | Pt100 or 10 kΩ thermistor |
| Heater | 1.5 W at 12 VDC |
| Standard cable length | 5 m |
| Version order codes | SR22-T1, SR22-T2 |
Extended spectral range
In addition to the features and benefits of the SR20 pyranometer, the SR22 has a high-quality quartz inner and outer dome. This results in a spectral range of 190 to 4000 x 10-9 m. The SR22 covers the entire solar spectrum, including the part between 3000 and 4000 x 10-9 m, which is not measured by glass-domed pyranometers.
Measurement accuracy
To improve overall measurement accuracy, Hukseflux effectively targeted two main sources of measurement uncertainty: calibration and “zero offset a”. The initial calibration uncertainty is less than 1.7%. The “zero offset a” specification of the SR22 is 5 W/m2 without ventilation. With ventilation (with VU01) it is only 2.5 W/m2.
The low temperature dependence of the SR22 makes it an ideal candidate for use in very cold and very hot conditions. The temperature dependence of each individual instrument is tested and provided as a second-degree polynomial. This information can be used to further reduce the temperature dependence during post-processing.
SR22 Pyranometer
Suggested use
Scientific climatological observations
Reference instrument for comparison
Extreme climates (tropical/polar)
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Secondary standard pyranometer with quartz domes - extended spectral range
SR22 is a solar radiation sensor of the highest category in the ISO 9060 classification system: secondary standard. On top of the features and benefits of the successful SR20 pyranometer, SR22 has domes made of high-quality quartz, resulting in an extended spectral range. Covering the full solar spectrum, SR22’s extended spectral range potentially offers lower measurement- and calibration uncertainties compared to pyranometers with glass domes. SR22 is typically used in high-accuracy climatological networks.
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