SR12 PYRANOMETER
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Thermal Sensors First class pyranometer for solar energy test applications SR12 is a high accuracy solar radiation sensor that meets and exceeds the ISO 9060 standard performance mandate for first class pyranometers for “solar energy test applications”. It is the preferred instrument for PV system performance monitoring. An internal temperature sensor and a heater are features of SR12 pyranometer; its directional response is tested and reported for every individual instrument. Introduction SR12 is a solar radiation sensor that is applied in high accuracy observations. It measures the solar radiation received by a plane surface from a 180o field of view angle. This quantity, expressed in W/m2 , is called “hemispherical” solar radiation. SR12 pyranometer has two unique features: a heater and a temperature sensor for additional quality assurance. The incorporated heater reduces measurement errors caused by earlymorning dew deposition. Finally, all sensors have individually been tested on directional response; a report is included with SR12’s calibration certificate. PV system performance testing Figure 1 SR12 first class pyranometer for solar energy test applications The ASTM E2848 “Standard Test Method for Reporting Photovoltaic Non-Concentrator System Performance” (issued end 2011) confirms that a pyranometer is the preferred instrument for outdoor PV testing. SR12 pyranometer complies with the requirements of this standard. SR12 is also the first pyranometer of its kind meeting the ISO 9060 mandate for first class pyranometers for “solar energy test applications”. Improved measurement accuracy Calibration of SR12 has been improved; our latest calibration method results in an uncertainty of the sensitivity of 1.8 %, compared to typical uncertainties of higher than 2.8 % for this pyranometer class. Uncertainty evaluation Figure 2 PV system performance monitoring pyranometers The uncertainty of a measurement under outdoor conditions depends on many factors. Guidelines for uncertainty evaluation according to the “Guide to Expression of Uncertainty in Measurement” (GUM) can be found in our manuals. We provide spreadsheets to assist in the process of uncertainty evaluation of your measurement. Copyright by Hukseflux. Version 1303. We reserve the right to change specifications without prior notice Page 1/2. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com

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Thermal Sensors SR12 design SR12 pyranometer employs a thermal sensor with black coating, two glass domes and an anodised aluminium body. hemispherical solar radiation ISO classification first class pyranometer for solar energy test applications Directional response report included Calibration uncertainty 1.8 % (k = 2) Calibration traceability to WRR Spectral range 285 to 3000 x 10-9 m Sensitivity (nominal) 15 x 10-6 V/(W/m2) Rated operating temperature -40 to +80 oC range Temperature response < ± 2 % (-10 to +40 °C) Temperature sensor Pt100 or 10 kΩ thermistor Standard cable length 5m...

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