The Black & White Pyranometer has a detector consisting of a differential thermopile with the hot-junction receivers blackened and the cold-junction receivers whitened. The receiver is of radial wire-wound plated construction with the black segments coated with a flat black coating and the white with Barium Sulfate. Built-in temperature compensation with thermistor circuitry is incorporated to free the instrument from effects of ambient temperature. A precision ground optical glass hemisphere of Schott glass WG295 uniformly transmits energy from 0.285 to 2.8 µm.
The cast aluminum case carries a circular spirit level and adjustable leveling screws. Also supplied is a desiccator, which can be readily inspected.
A calibration certificate traceable to the World Radiation Reference is included.