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240-8110 Net Radiometer

240-8110 Net Radiometer
The 240-8110 Net Radiometer is an instrument for direct and instantaneous determination of net radiation (difference between incident and reflected radiation) in short and long wavelength range.
Product Details

The 240-8110 Net Radiometer is an instrument for direct and instantaneous determination of net radiation (difference between incident and reflected radiation) in short and long wavelength range.

The receiver plate facing up measures short-wave global radiation and long-wave radiation of the atmosphere according to its temperature. The receiver plate facing down measures reflected short-wave radiation and long-wave radiation according to the temperature emitted by the surface beneath the sensor. Both of the receiver plates are electrically cross connected, thus, a direct determination of net radiation is possible.

A positive sign of the value measured means radiation flux directed to the reference surface, a negative sign radiation flux off the reference surface. Hence follows that the reference surface is gaining radiant energy when positive values are measured. At negative signs the surface looses energy by long-wave radiation.

The instruments consists of the sensor with a desiccant (silica gel) container and a 400 mm (16") long support arm. The sensing element of the instrument consists of 16 Cu-CuNi thermocouple covered by two circular blackened copper plates (receiver plates) which are protected by two lupolene domes. Watertight sealing is achieved by two fixing rings and o-rings. Two bull's-eye levels permit horizontal adjustment. The silica gel container is incorporated in the front of the case.

Features

  • WMO First Class
  • Independent from ambient temperature
  • Direct and instantaneous determination of net radiation

Specifications

  • Spectral sensitivity: 0.3 to >30 µm
  • Azimuth response: 0.5% of the value
  • Cosine response: < 5% of the value, zenith angle 0° to 80°
  • Response time: < 25 sec (95%), < 45 sec (99%)
  • Measuring range: 0-1500 Wm² (positive & negative)
  • Resolution: < 1 Wm²
  • Stability: < 3% per year (temporary operation)
  • Temperature effect: < 2% of the value between -20°C to +40°C
  • Linearity: < 2% in the range 0.5-1330 Wm²
  • Impedance: About 5 ohm
  • Output: About 15 µV/Wm² (positive & negative)
  • Ambient temperature: -40°C to +60°C (-40°F to +140°F)
  • Windshield: Lupolene dome, 1.2" (31 mm) diameter
  • Size: 21" L x 2" W x 1.5" H
  • Weight/shipping: l lb/4 lbs
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