Geonica - Model GEO-SR11 -First Class Solar Radiation Sensor

GE0-SR11 measures the solar radiation received by a plane surface from a 180° field of view angle. This quantity, expressed in W/m2, is called "hemispherical" or "global" solar radiation. GE0-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).

Employing two glass domes, certain measurement errors are reduced; in particular thermal offsets, so that a high measurement accuracy can be attained.

Calibration of GEO-SR11 pyranometer has been improved; the 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.

Some of the GEO-SR11 suggested uses are PV system performance monitoring, general solar resource monitoring, indoor simulated solar testing and meteorological networks. SR11 may be also used, in combination with appropriate software, to estimate sunshine duration.

Applicable instrument classification standards are ISO 9060 and WMO-No. 8. Calibration is according to ISO 9847. PV related standards are ASTM E2848 and IEC 61724.

• ISO classification: first class
• Zero offset : < ±5 W/m2 unventilated
• Spectral range : 285 to 3000 nm
• Sensitivity (nominal) : 15 uV/(W/m2)
• Operating temperature : -40° to +80°C
• Irradiance range : 0 to 2000 W/m2
• Temperature response : ±2%(-10°to+40°C)
• Calibration traceability : WRR
• Required heater power : 1.5 W@ 12VDC
• Calibration uncertainty : <  1.8% (k=2)
• Cable length: 5 m (standard)