SRA11 albedometer

Analogue first class albedometer

SRA11 first class albedometer is an instrument that measures global and reflected solar radiation and the solar albedo, or solar reflectance. It is composed of two SR11 first class pyranometers and one AMF02 albedometer mounting kit. AMF02 includes one glare screen, one mounting fixture with rod, mounting hardware and tools. Each pyranometer has a thermopile sensor and offers output in millivolt; the upfacing one measuring global solar radiation, the downfacing one measuring reflected solar radiation. SRA11 complies with the latest ISO and WMO standards. The modular design facilitates maintenance and calibration.

Specifications

Measurand

global solar radiation and reflected solar radiation

Optional measurand

albedo or solar reflectance
net solar radiation

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Specifications
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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 first class pyranometer

Output

analogue millivolt

Mounting

mounting rod with 15 x 10⁻³ m diameter

Calibration uncertainty

< 1.8 % (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

< ± 2 % (-10 to +40 °C)

Standard cable length

5 m (see options)

Sensors

(2 x) SR11 first class pyranometer

Included with AMF02

(1 x) glare screen; (1 x) fixture with rod; (2 x) o-ring; (1 x) conical positioner; (2 x) plug (pre-mounted); (2 x) M5x12 socket head cap screw; (1 x) M6x10 socket head cap screw; (2 x) M6x12 set screw (pre-mounted); (1 x) instruction sheet

Options

longer cables, in multiples of 5 m, cable lengths above 20 m in multiples of 10 m

Manuals & Downloads

SRA11 albedometer brochure

SRA11 albedometer user manual

Description

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.Using SRA11 albedometer is easy. The instrument is composed of two SR11 first class 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 SRA11 product certificate. The working principle and specifications of the pyranometers can be found in the SR11 user manual. SRA11’s analogue output is in millivolt. SRA11 can be connected directly to commonly used datalogging systems.

SRA11 consists of two identical pyranometers model SR11, one facing up, one facing down. The two sensors should be ordered with one AMF02 albedometer mounting kit. AMF02 includes a fixture with rod for mounting purposes and a glare screen. The user assembles these modular components into SRA11 albedometer. Mounting hardware, tools and a mounting and fixation instruction are part of the AMF02 delivery too.