Thermal Sensors 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 combination with VU01 ventilation unit in high-accuracy climatological networks. Figure 1 SR22 secondary standard pyranometer Introduction SR22 measures the solar radiation received by a plane surface, in W/m2, from a 180o field of view angle. This ISO 9060 secondary standard pyranometer enables users to attain the highest measurement accuracy and offers the widest spectral range commercially available. SR22 has an onboard temperature sensor. When using SR22, additional ventilation is recommended. SR22 is typically combined with ventilation unit VU01. Extended spectral range Figure 2 SR22 sensor combined with VU01 ventilation unit 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. Copyright by Hukseflux. Version 1506. We reserve the right to change specifications without prior notice Page 1/4. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.

Thermal Sensors Measurement accuracy Uncertainty evaluation 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. The uncertainty of a measurement under outdoor conditions depends on many factors. Guidelines for uncertainty evaluation according to the “Guide to Expression of Uncertainty in Measurement” (GUM) can be found in our...

Thermal Sensors scientific climatological observations reference instrument for comparison extreme climates (tropical / polar) Figure 5 SR22 side view SR20 secondary standard pyranometer SR20-D2 digital secondary standard pyranometer with Modbus RTU and 4-20 mA output SR25 secondary standard pyranometer with sapphire outer dome view our complete product range of solar sensors hemispherical solar radiation ISO classification secondary standard pyranometer Calibration uncertainty < 1.7 % (k = 2) Zero offset a 5 W/m2 unventilated Zero offset a 2.5 W/m2 ventilated Calibration traceability to WRR...

Thermal Sensors SR22 secondary standard pyranometer – with quartz domes Nowadays, the best pyranometers are made by Hukseflux Thermal Sensors. This overview of features and benefits of SR22 gives you some of the reasons why! Whatever your application is, Hukseflux offers the highest accuracy in every class at the most attractive price level. Best measurement accuracy • lowest zero offsets • lowest calibration uncertainty • best temperature dependence Best connector • interchangeable cables • IP67 grade • for industrial use Best sun screen • sealed • corrosion protection of body • no dry-cooking...