240-8104 Albedometer 
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| 240-8104 Albedometer (Dual Pyranometer) |
- WMO & ISO 9060 First Class
- Two separate outputs
- Global and reflected solar radiation
- Independent from ambient temperature
The Model 240-8104 Albedometer is essentially a combination of two star pyranometers, one facing upward and one facing downward. The upward facing pyranometer measures global radiation (diffuse and direct solar radiation), while the downward facing pyranometer measures reflected solar radiation. Separate outputs are provided for each pyranometer, which can be recorded together on a strip chart recorder. Albedo, the fraction of incident radiation reflected by a surface, can be calculated from the output data (albedo = reflected radiation ÷ global radiation). Short-wave net radiation can also be calculated.
Like the 240-8101 Star Pyranometer, the 240-8104 Albedometer has a spectral response of 0.3 to 3 microns. Thus, no long-wave terrestrial radiation is measured. This is the major difference between the albedometer and the 240-8111 Pyrradiometer, which measures short and long-wave radiation and is similar in appearance to the 240-8104.
Each star pyranometer is protected by a crystal glass dome. Desiccant tubes are attached to the housing to absorb internal moisture. An 8" long mounting handle is provided. Circular levels are included on each face to aid in installation. Each sensor is supplied with a calibration certificate.
Specifications
Sensing element: 12 black & white copper segments with 6 thermocouples each
Sensitivity: 0.3 to 3 µm
Azimuth response: < 3% of the value
Cosine response: < 3% 0.95% of the value, 0° to 80° zenith angle
± 3% from 60° to 80° zenith angle
Response time: < 25 seconds
Measuring range: 0-1500 Wm²
Resolution: < 1 Wm²
Stability: < 1% per year (temporary operation)
Temperature effect: < 1% of the value between -20 °C to 40°C
Linearity: < 0.5% in the range 0.5-1330 W/m²
Impedance: Approx 35 ohms
Ambient temperature: -40°C to +60°C
Windshield: Polished glass dome, 2.75" dia x 0.08" thick (70 x 2 mm)
Leveling: Bull's-eye level on each face
Size: 14.6" L x 4.5" W x 4.2" H (371 x 114 x 107 mm)
Weight/shipping: 3.5 lbs/10 lbs (1.6 kg/4.5 kg)
Cable: 2 polar shielded, 3 m length
Ordering Information
240-8104 Albedometer; including 2 desiccant tubes, silica gel, and 3 meters of cable
240-8104-D Glass Dome, 2 required
240-8104-OR O-Rings, set of 6
240-8104-SG Silica Gel, 100 grams
240-8104-SGC Silica Gel Container, filled
330-0524 Additional Cable, per foot
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Solar Radiation Sensors
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