Davis solar radiation sensor

The solar radiation sensor, or solar pyranometer, measures global radiation, the sum at the point of measurement of both the direct and diffuse components of solar irradiance.
The sensor’s transducer, which converts incident radiation to electrical current, is a silicon photodiode with wide spectral response.
The outer shell shields the sensor body from thermal radiation and provides an airflow path for convection cooling of the body, minimizing heating of the sensor interior.
Spring-loaded mounting screws, in conjunction with the level indicator, enable rapid and accurate levelling of the sensor.
Each sensor is calibrated against a secondary standard which is calibrated periodically against an Eppley precision spectral pyranometer in natural daylight.