The 240-140 Silicon Cell Pyranometer measures global solar radiation. When used with the 240-152 Shadow Band, it will measure diffuse radiation. This pyranometer is low cost, lightweight, and easy to install. The 240-150 (shown in photo) includes a mounting and leveling plate.
The sensor is a silicon photovoltaic cell which absorbs radiation from 0.35 to 1.15 microns. The silicon cell converts this light energy into electrical energy, and the output voltage (approximately 80 mV/1000 Wm²) is essentially linear with light intensity. Full scale response time is less than 1 millisecond due to the fact that the instrument is light sensitive, not heat sensitive. If the output is integrated over a daily period, the accuracy of the value is within ±3%. Accuracy of instantaneous values is ±5%. Temperature compensation is provided from 4° to 60°C.