Thermal Sensors First class pyranometer SR11 is a high accuracy solar radiation sensor. SR11 first class pyranometer complies with the first class specifications of the ISO 9060 standard and the WMO Guide. It is the preferred instrument for outdoor PV system performance monitoring, according to the ASTM E2848 standard. Introduction SR11 is a solar radiation sensor that is applied in general 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. SR11 pyranometer can be employed outdoors under the sun, as well as indoors with lamp-based solar simulators. Its orientation depends on the application and may be horizontal, tilted (for plane of array radiation) or inverted (for reflected radiation). PV system performance monitoring 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 PV system performance monitoring. SR11 complies with the requirements of this standard. Improved measurement accuracy Figure 1 SR11 first class pyranometer Calibration of SR11 pyranometer 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 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. Figure 2 SR11 pyranometer in greenhouse application PV system performance monitoring general solar resource monitoring indoor simulated solar testing meteorological networks Copyright by Hukseflux. Version 1302. 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: [email protected]

Thermal Sensors SR11 design SR11 first class pyranometer employs a thermal sensor with black coating, two glass domes and an anodised aluminium body. 3 SR11 specifications Measurand ISO classification Calibration uncertainty Calibration traceability Spectral range Sensitivity (nominal) Rated operating temperature range Temperature response Standard cable length hemispherical solar radiation first class pyranometer < 1.8 % (k = 2) to WRR 285 to 3000 x 10-9 m 15 x 10-6 V/(W/m2) -40 to +80 oC < ± 2 % (-10 to +40 °C) 5m longer cable, in multiples of 5 metres internal temperature sensor Figure 3 overview...