SR20 is a solar radiation sensor of the highest category in the ISO 9060 classification system: secondary standard. SR20 pyranometer is designed for PV system performance monitoring and scientific meteorological observations. It was released February 2013 after a thorough program of acceptance tests

Hukseflux Thermal Sensors, founded in 1993, offers a complete range of sensors, systems and services for the measurement of solar radiation, heat flux and thermal conductivity. It has now added the SR20 secondary standard pyranometer to its range of solar radiation sensors. SR20 is a solar radiation sensor of the highest category in the ISO 9060 classification system. SR20 pyranometer should be used where the highest measurement accuracy is required. It measures the solar radiation received by a plane surface, in W/m2, from a 180 degree field of view angle. SR20 enables users to attain the highest measurement accuracy and excels in demanding applications.

SR20 is designed for PV system performance monitoring, scientific meteorological observations, as a reference instrument for comparisons and for use in extreme climates (tropical / polar). SR20 pyranometer uses a state of the art thermopile sensor with black coated surface, two domes and an anodised aluminium body. The connector, desiccant holder and sun screen fixation are ultra robust and designed for industrial use. All parts are specified for use across SR20's entire rated operating temperature range.

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 reduced to less than 1.2 %, an improvement of 15 % relative to competing models. The "zero offset a" specification of SR20 is 5 W/m2 unventilated. Competing models state 12 W/m2 unventilated and 7 W/m2 ventilated.

more information and full specifications: www.hukseflux.com