SR20 Spectrally Flat Class A Pyranometer

Improved measurement accuracy

To improve overall measurement accuracy, Hukseflux effectively addressed two main sources of measurement uncertainty: calibration and “zero-offset”.
Initial calibration uncertainty is reduced to less than 1.2%, a 15% improvement over competitive models. The SR20’s “zero-offset” specification is 5 W/m² unventilated. Competitive models state 12 W/m² unventilated and 7 W/m² ventilated.

Demanding applications

The temperature dependence of each individual instrument is tested and provided as a second-degree polynomial. This information can be used to further reduce temperature dependence during post-processing. The low temperature dependence of the SR20 makes it an ideal candidate for use in very cold and very hot conditions. The built-in heater reduces measurement errors caused by dew deposition in the early morning.

SR20 Pyranometer Design

The SR20 pyranometer uses a state-of-the-art thermopile sensor with a black coated surface, two domes and an anodized aluminum body. The connector, desiccant holder and sunshield attachment are ultra-rugged and designed for industrial use. All parts are specified for use over the full nominal operating temperature range of the SR20.

Suggested Use

Photovoltaic system performance monitoring
Scientific meteorological observations
Reference instrument for comparison
Extreme climates (tropical/polar)