SRA20 albedometer

SRA20 secondary standard albedometer
SRA20 consists of two identical pyranometers model SR20, one facing up, one facing down
SRA20 albedometer for albedo measurement
SRA20 secondary standard albedometer
Secondary standard albedometer

SRA20 albedometer is an instrument that measures global and reflected solar radiation and the solar albedo, or solar reflectance, with the highest accuracy. It is composed of two SR20 secondary standard pyranometers with thermopile sensors; the upfacing one measuring global solar radiation, the downfacing one measuring reflected solar radiation. SRA20 complies with the latest ISO and WMO standards.

Specifications
Measurand
  • global solar radiation and reflected solar radiation
Optional measurand
  • albedo or solar reflectance
  • net solar radiation
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Specifications

Measurand
  • global solar radiation and reflected solar radiation
Measurement range
  • 0 to 2000 W/m²
Optional measurand
  • albedo or solar reflectance
  • net solar radiation
Sensitivity (nominal)
  • 15 x 10⁻⁶ V/(W/m²)
Included sensors
  • 2 x identical ISO 9060 secondary standard pyranometer
Output
  • analogue millivolt
Temperature sensor
  • Pt100 or 10 kΩ thermistor included
Mounting
  • mounting rod with 15 x 10⁻³ m diameter included
Calibration uncertainty
  • < 1.2 % (k = 2)
Calibration traceability
  • to WRR
Spectral range
  • 285 to 3000 x 10⁻⁹ m
Rated operating temperature range
  • -40 to +80 °C
Temperature response
  • < ± 1 % (-10 to +40 °C) < ± 0.4 % (-30 to +50 °C) with correction in dataprocessing
Temperature response test and directional response test of individual instrument
  • reports included
Standard cable length
  • 5 m (see options)
Options
  • SRA20 with Pt100 temperature sensor instead of internal heater and 10 kΩ thermistor
  • longer cable, in multiples of 5 m, cable lengths above 20 m in multiples of 10 m
Manuals & Downloads
SRA20 Albedometer brochure

Description

SRA20 secondary standard albedometer for bifacial solar modules

Albedo, also called solar reflectance, is defined as the ratio of the reflected to the global radiation. The solar albedo depends on the directional distribution of incoming radiation and on surface properties at ground level. Albedos of typical surfaces range from about 4 % for fresh asphalt, and 15 % for green grass to 90 % for fresh snow.

SRA20 albedometer

Using SRA20 albedometer is easy. The instrument is composed of two SR20 secondary standard pyranometers; the upfacing one measuring global solar radiation, the downfacing one measuring reflected solar radiation. The irradiance in W/m² in each direction is calculated by dividing the pyranometer output, a small voltage, by the sensitivity. The sensitivity of both pyranometers is provided on the SRA20 product certificate. The working principle and specifications of the pyranometers can be found in the SRA20 user manual. We recommend to use SRA20 in particular in applications where the highest measurement accuracy is required. SRA20’s analogue output is in millivolt. SRA20 can be connected directly to commonly used datalogging systems.

SRA20 albedometer facing down

SRA20 Design

SRA20 consists of two identical pyranometers model SR20, one facing up, one facing down. The albedometer body is equipped with a 15 x 10⁻³ m diameter rod for mounting purposes. A sun screen is part of the delivery too. SRA20, including its sun screen fixation, connector and desiccant holder, is very robust. The albedometer has an incorporated heater and a temperature sensor. SRA20 can be ordered optionally with longer cable, and with a Pt100 temperature sensor instead of an internal heater and instead of a 10 kΩ thermistor.

Suggested use

  • high-accuracy meteorological observations
  • building physics, roof reflectance studies
  • extreme climates (tropical / polar)
SRA20 albedometer
SRA20 secondary standard albedometer
  • the incorporated heater reduces measurement errors caused by frost and dew
  • highest accuracy
  • very robust
Would you like a personalised quote?

or contact us: info@hukseflux.com