The Eppley Laboratory, INC

INSTRUMENTATION

  • Precision Spectral Pyranometer
  • Black & White Pyranometer
  • Precision Infrared Radiometer
  • Ventilators
  • Total Ultraviolet Radiometer
  • Normal Incidence Pyrheliometer

 

  • Solar Trackers
  • Shading Devices
  • Abslolute Cavity Radiometer
  • Standard Lamps
  • Blackbodies
  • Laboratories Thermopiles

 

PRECISION SPECTRAL PYRANOMETER

Model PSP

The Precision Spectral Pyranometer is a World Meteorological Organization First Class Radiometer designed for the measurement of sun and sky radiation, totally or in defined broad wavelength bands. It comprises a circular multi-junction wire-wound Eppley thermopile which has the ability to withstand severe mechanical vibration and shock. Its receiver is coated with Parson’s black lacquer (non-wavelength selective absorption). This instrument is supplied with a pair of removable precision ground and polished hemispheres of Schott optical glass. Both hemispheres are made of clear WG295 glass which is uniformly transparent to energy between 0.285 to 2.8µm. For special applications, other Schott glasses and Infrasil II quartz hemispheres are available. Included is a spirit level, adjustable leveling screws and desiccators which can be readily inspected. The instrument has a cast bronze body with a white enameled guard disk (shield) and comes with a transit/storage case. A calibration certificate traceable to the World Radiation Reference and a temperature compensation curve is included.

SPECIFICATIONS

  • Sensitivity: approx. 9 µV/Wm-2.
  • Impedance: approx. 650 Ohms.
  • Temperature Dependence: ±1% over ambient temperature range -20 to +40°C
  • (Temperature compensation of sensitivity can be supplied over other ranges at additional charge).
  • Linearity: ±0.5% from 0 to 2800 Wm-2.
  • Response time: 1 second (1/e signal).
  • Cosine:
    • ±1% from normalization 0-70° zenith angle;
    • ±3% 70-80° zenith angle.
  • Mechanical Vibration: tested up to 20 g’s without damage.
  • Calibration: integrating hemisphere.
  • Size: 5.75 inch diameter, 3.75 inches high.
  • Weight: 7 pounds.
  • Orientation: Performance is not affected by orientation or tilt.

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 are desiccators, 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.

VENTILATOR

Model VEN

The Eppley Ventilator is designed to be used with the Precision Spectral Pyranometer, Model PSP or the Precision Infrared Radiometer, Model PIR.

A “muffin” fan in the base continuously blows air over both the instrument case and the instrument dome, keeping the hemispheres cleaner from frost, snow, dew and moisture buildup. The fan provides approximately 30 C FM of ventilation and draws approximately 0.15 amps, or 11 watts, in the 115 volt configuration. The clear plastic upper housing allows the instrument, connector, and desiccators window to be easily viewed. A white enameled guard disk, leveling screws and hold down holes are provided. The 8 inch diameter, 5.75 inch high ventilator weighs 5.5 pounds.

For more details: – www.eppleylab.com