Geonica - Model GE0-SRA20 -Secondary Standard Albedometer

Albedo is defined as the ratio of diffusely reflected to incident solar radiation.

In general, the albedo depends on the directional distribution of incoming radiation and surface properties. Albedos of typical surfaces range from about 4% for fresh asphalt, 15% for green grass and up to 90% for fresh snow.

SRA20 is composed of two SR20 secondary standard pyranometers, which measure the solar radiation received by a plane surface, in W/m2, from a solid angle of 2n sr.

For the working principle and specifications of the pyra-nometer, manual of SR20 pyranometer should be consulted.

We recommend to use SRA20 in particular in applications where highest accuracy is necessary. Specifications of this sensor are very good:
Temperature dependence specifications of SR20 pyrano-meter are outstanding, and may even be improved during data processing. The temperature dependence of every individual instrument is tested and results are presented as a second degree polynomial. Directional response is also tested individually for each sensor and reported as well.

Heating reduces sensitivity to fouling and reduces measurement errors caused by early-morning dew deposition.

Mounting of the SRA20 albedometer by the user is done using a % inch NPS rod, tightened by a screw. This mounting rod is not part of the delivery.

Suggested Use

• Meteorological observations
• Building physics
• Roof reflectance studies

Standards
Applicable standards are ISO 9060 and 9847, WMO and ASTM E824-05andE1918-06.

Options
Additional cable length in multiples of 5 m (add to the standard 5 m)

See Also
Alternative instrument: SRA01 for lower accuracy measurements.
View our complete product range of solar sensors.

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