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SR22 — HuksefluxUSA

Updated:2025-03-13

Brand: Hukseflux
Model：SR22
Description: 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 dom
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Product Details

SR22 — HuksefluxUSA： User's Manual Datasheet

Extended Spectral Range

On top of the features and benefits of SR20 pyranometer, SR22 has an inner and outer dome made of high-quality quartz. This results in SR22’s spectral range of 190 to 4000 x 10-9 m. SR22 covers the full solar spectrum, including the part between 3000 to 4000 x 10-9 m, which is not measured by pyranometers with glass domes.

Measurement Accuracy

In order to improve overall measurement accuracy, Hukseflux effectively targeted two major sources of measurement uncertainty: calibration and “zero offset a”. The initial calibration uncertainty is less than 1.7 %. The “zero offset a” specification of SR22 is 5 W/m2 unventilated. Ventilated (with VU01) it is just 2.5 W/m2.

SR22’s low temperature dependence makes it an ideal candidate for use under very cold and very hot conditions. The temperature dependence of every individual instrument is tested and supplied as a second degree polynomial. This information can be used for further reduction of temperature dependence during post-processing.

Suggested Use

Scientific climatological observations

SReference instrument for comparison

SExtreme climates (tropical / polar)

Areas of Application

Meteorology / surface energy flux measurement

Solar energy / PV system performance monitoring

SR22 — HuksefluxUSA Specifications：

Measurand	hemispherical solar radiation
ISO 9060:2018 classification	Spectrally flat Class A (secondary standard)
IEC 61724-1:2017 compliance	Class A (when used with VU01)
Application	National Meteorological Networks, meteorology / climatology, other
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
Temperature response	< ± 1 % (-10 to +40 °C)
Temperature response test of individual instrument	report included
Directional response test of individual instrument	report included
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
Options	• Longer cable, in multiples of 5 metres