BLACK AND WHITE PYRANOMETER

Model 8-48

The Black & White Pyranometer has a detector consisting of a differential thermopile with the hot-junction receivers blackened and the cold-junction receivers whitened. The receiver is of radial wire-wound plated construction with the black segments coated with a flat black coating and the white with Barium Sulfate. Built-in temperature compensation with thermistor circuitry is incorporated to free the instrument from effects of ambient temperature. A precision ground optical glass hemisphere of Schott glass WG295 uniformly transmits energy from 0.285 to 2.8 µm.

The cast aluminum case carries a circular spirit level and adjustable leveling screws. Also supplied is a desiccator, which can be readily inspected.

A calibration certificate traceable to the World Radiation Reference is included.

SPECIFICATIONS

• Sensitivity: approx. 10 µV/Wm^-2.
• Impedance: approx. 350 Ohms.
• Temperature Dependence: ±1.5% over ambient temperature range -20 to +40°C.
• Linearity: ±1% from 0 to 1400 Wm^-2.
• Response time: 5 seconds (1/e signal).
• Cosine:
  • ± 2 % from normalization 0-70° zenith angle;
  • ± 5 % 70-80° zenith angle.
• Mechanical Vibration: tested up to 20 g's without damage.
• Calibration: integrating hemisphere.
• Size: 5.75 inch diameter, 2.75 inches high.
• Weight: 2 pounds.