Class A pyranometer SR20

analogISO 9060

SR20 is a pyranometer of the highest category in the ISO 9060 classification system: secondary standard. This solar radiation sensor is used where the highest measurement accuracy is required. It measures the solar radiation received by a plane surface, in W/m², from a 180 ° field of view angle. SR20 secondary standard pyranometer enables you to attain the highest measurement accuracy and excels in demanding applications. After a thorough programme of acceptance testing, SR20 was released February 2013. It offers analog millivolt output. Improved measurement accuracy In order to improve overall measurement accuracy, Hukx 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. Demanding applications 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. SR20’s low temperature dependence makes it an ideal candidate for use under very cold and very hot conditions. The incorporated heater reduces measurement errors caused by early-morning dew deposition. SR20 pyranometer design SR20 pyranometer uses a state of the art thermopile sensor with black coated surface, two domes and an anodized aluminum body. The connector, desiccant holder and sun screen fixation are ultra robust and designed for industrial use.