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- [ Broadband UV Radiometer CUV3 ]
- [ Narrowband Scientific
UV Radiometer ]
- [ Pyranometer CM 11 ]
- [ Silicon pyranometer
SP Lite ]
- [ Solar Radiation Sensor ]
- [ UV Sensor ]

The CM 11 Pyranometer complies with the specifications for "secondary standards", the best of three classes, as published in the "Guide to meteorological Instruments and Methods of Observations", Fifth edition, 1983, of Secretariat of the World Meteorological Organization (WMO) - Gevena - Switzerland.

It is suited for the measurement of solar radiation as received on a flat surface from a whole hemisphere.

Description :

The CM 11 pyranometer sensor consists of 100 thermocouples imprinted on a ceramic substrate using thickfilm techniques.

The arrangement of the thermocouples is circular, resulting in a low azimuth error. The Al2O3 substrate has high thermal conductivity. The temperature difference across the substrate therefore will never exceed 3°C even at maximum sun irradiance. This results in negligible heat convection in the inner dome and when tilting, the sensitivity of the pyranometer will not change more than 0.2% at 1400W/m².

The temperature coeficient of the receiver is thermistor compensated; so the sensitivity remains constant within ±1% over at least a temperature range of -10° to 40°C. A second, not illuminated, substrate is installed to compensate for heat flows in the receiving substrate not caused by radiation. The heating and cooling of the pyranometer housing thus hardly affect the zero of the instrument.

Cosine and azimuth error are less than 3% at 10° sun altitude. Individual cosine response figures are mentioned in the calibration certificate (according to World Radiometric Reference) supplied with the Pyranometer.

Specifications :

• Sensitivity : 4 -6 µ V/Wm¯ ²
• Non-linearity : ± 0.6%
• Impedance : 700 - 1500 ohms
• Response : <5s (1/e), 99%
• Time : value after 24 s
• Spectral range : 305 - 2800nm. (50% transmission points)
• Weight : 830 g.
• Material : Anodized Aluminium
• Cable : 5 meters
• Dimensions : Diameter of screen : 150mm
• Total height (including outer glass dome) : 92mm