SR11 First Class Solar Radiation Sensor
SR11 is a solar radiation sensor that can be applied in scientific grade solar radiation observations. It complies with the “first class” specifications within the latest ISO and WMO standards. The scientific name of this instrument is pyranometer. SR11 serves to measure the solar radiation flux that is incident on a plane surface in W/m2 from a 180 degrees field of view (also called “global” solar radiation). Working completely passive, using a thermopile sensor, SR11 generates a small output voltage proportional to this flux. Employing two glass domes, certain measurement errors are reduced; in particular thermal offsets, so that a high measurement accuracy can be attained. Using SR11 is easy. For readout one only needs an accurate voltmeter that works in the millivolt range. To calculate the radiation level the voltage must be divided by the sensitivity; a constant that is supplied with each individual instrument. SR11 can directly be connected to most commonly used datalogging systems.
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