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SR22 Pyranometer
  • SR22 Pyranometer
  • SR22 Pyranometer

SR22 Pyranometer

SR22

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.

Description

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)

Product Details
SR22
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