SR20-D2

SR20-D2 is a solar radiation sensor of the highest category in the ISO 9060 classification system: secondary standard. SR20-D2 is designed for the solar PV industry, offering two types of commonly used irradiance outputs: digital via Modbus RTU over RS-485 and analogue 4-20 mA (current loop). These industry standards allow for easy data acquisition, easy read-out and error-free instrument exchange, when using SR20-D2. Individually tested for temperature and directional response, SR20-D2 is the most accurate digital secondary standard pyranometer available.

BEST PYRANOMETER FOR PV INDUSTRY

SR20-D2 is the most accurate digital secondary standard pyranometer available. Its benefits:

• Digital output: easy implementation & servicing
• Best-in-class temperature response, < ± 0.4 % (-30 to +50 °C), best  “zero offset a” and best calibration uncertainty
• Test certificates for temperature response and directional response included as required by ISO 9060
• Re-calibration registers fully accessible to users

In order to improve overall measurement accuracy, Hukseflux effectively targeted two major sources of measurement uncertainty: calibration and “zero offset a”.
In addition, SR20-D2 has a negligible temperature response. All are best in class. The temperature response of every individual instrument is tested and corrected onboard by the instrument electronics, using a second degree polynomial. SR20-D2’s low temperature dependence makes it the ideal candidate for use under very cold and very hot conditions.