Class C albedometer SRA01

spectrally flatfor photovoltaic systems

Overview
SRA01 albedometer measures global and reflected solar radiation and solar albedo. It consists of two identical, spectrally flat Class C pyranometers with thermopile sensors—one facing upward to measure global solar radiation, the other facing downward to measure reflected solar radiation. SRA01 is fully compliant with the latest ISO and WMO standards.

Key features
• Class C performance: fully compliant with ISO 9060 spectrally flat Class C classification and WMO-No. 8 standards.
• Spectrally flat sensors: equipped with spectrally flat sensors on board, ensuring accurate measurement of both global and reflected solar radiation with different spectra using the same instrument and calibration.
• Integrated dual-pyranometer design: combines two identical SR01 pyranometers into a single housing, measuring incoming and reflected irradiance across a 180° field of view each.
• Direct analog output: generates small voltage signals proportional to incoming irradiance with a nominal sensitivity of 15 x 10⁻⁶ V/(W/m²), easily divided by certified sensitivity on the product certificate.
• Easy integration: housing is designed to fit a standard 3/4 inch NPS mounting tube with internal cable routing, keeping cables protected inside the tube.
• Convenient leveling: features an integrated bubble level for horizontal leveling during installation.
• Traceable calibration: calibration follows ISO 9847 and ASTM G207-11 protocols, with calibration uncertainty < 2.4 % (k = 2) and traceability to the World Radiometric Reference (WRR).

Applications
• General meteorological observations and weather station monitoring.
• Agricultural networks and agro-meteorological research.
• Building physics and roof reflectance studies.
• Climate studies and solar collector testing.

Specifications
• Measurand: global solar radiation and reflected solar radiation [W/m²]
• Optional measurand: albedo or solar reflectance [-], net solar radiation [W/m²]
• ISO 9060 classification: spectrally flat Class C pyranometer (2 x identical sensors included)
• Measurement range: 0 to 2000 W/m²
• Calibration uncertainty: < 2.4 % (k = 2)
• Calibration traceability: to WRR (World Radiometric Reference)
• Spectral range: 285 to 3000 x 10⁻⁹ m
• Nominal sensitivity: 15 x 10⁻⁶ V/(W/m²)
• Rated operating temperature range: -40 to +80 °C
• Temperature response (-10 to +40 °C): < ± 3 %
• Output type: analog voltage
• Mounting interface: fits 3/4 inch NPS tube (tube recommended OD < 28 x 10⁻³ m, ID > 20 x 10⁻³ m; mounting tube not included)
• Leveling: integrated bubble level included
• Standard cable length: 5 m

Options and accessories
• Standard cable length: 5 m
• Longer cable options: in multiples of 5 m; cable lengths above 20 m in multiples of 10 m
• Sun screens
• ALF01: albedometer leveling fixture
• CMF01: crossarm mounting fixture