| This pyranometer is a development of the well-known Eppley 10- and 50-junction 180° pyrheliometer originally introduced by Kimball and Hobbs in 1923. The detector is a differential thermopile with the hot-junction receivers blackened and the cold junction receivers whitened. The element is of radial wirewound-plated construction with the black segments coated with 3M black and the white with Barium Sulfate. Built-in temperature compensation with thermistor circuitry is incorporated to free the instrument from effects of ambient temperature. |
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