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Geonica - Model GEO-PSP - Precision Spectral Pyranometer
There are two generally accepted Classification Systems used for Pyranometers. ISO classifies pyra-nometers as a "Secondary Standards", "First Class" or "Second Class" while WMO uses "High Quality", "Good Quality" and "Moderate Quality". The Precision Spectral Pyranometer, Model PSP is classified as a ISO Secondary Standard or WMO High Quality Pyranometer. It comprises a circular multi-junction wire-wound 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 2.8pm.
- Classification: ISO Secondary Standard Pyranometer / WMO High Class
- Response Time (95%): <1 second
- Zero Offset to 200 Wnv2 net radiant loss to sky: 4-6 Wm2
- Zero Offset to 5° C/hr change in ambient temperature: 1-2 Wm *
- Resolution: < 1 Wm2
- Non-Stability: <0.5% / yr (typical
- Non-Linearity: ±0.5%
- Directional Response: < 10 Wm2
- Spectral Selectivity: 1%
- Temperature Response: ±1%
- Tilt Response: < 0.5%
- Achievable Uncertainty (Hourly): 1-2 %
- Achievable Uncertainty (Daily): 1-2 %
- Suitable Application: Working Standard or Network Measurements
For special applications, other Schott glasses and Infrasil II quartz hemispheres are available. Included is a spirit level, adjustable leveling screws and a desiccator 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.