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Important features :
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The CMP 21 is a high performance research grade pyranometer which is fully compliant with all ISO 9060:2018 - spectrally flat, class A (formerly ISO 9060:1990 Secondary Standard) instrument performance criteria (highest possible ISO pyranometer performance category).
The CMP 21 pyranometer is designed for measuring the irradiance (radiant flux, Watt/m²) on a plane surface, which results from the direct solar radiation and from the diffuse radiation incident from the hemisphere above.
CMP 21 has the same detector as the CMP 10 and individually optimized temperature compensation. A standard thermistor sensor (or optionally Pt100) is fitted to monitor the housing temperature. Each instrument is supplied with its own temperature and directional (cosine response) test data.
It is the choice for scientific use and in top level solar radiation monitoring networks such as the BSRN (Baseline Surface Radiation Network) of WMO.
The integrated bubble level is raised to the top of the housing and can be viewed without removing the snap-on sun shield, which also covers the signal cable connector. The connection with weatherproof connectors allows easy replacement and recalibration.
The screw-in drying cartridge is easy to remove and the replacement desiccant is supplied in convenient refill packets.
The pyranometer does not require any power. His output signal is a low voltage around 0 - 20 mV in relation to the amount of incoming radiation. When a higher signal level (0 - 1 V or 4 - 20 mA) is required, the choice of an AMPBOX or the SMART PYRANOMETER Model SMP 10,12 or 22 has to be considered.
Specifications
| Spectral range (50% points) | 285 to 2800 nm |
| Sensitivity | 7 - 14 µV/W/m² |
| Response time | 5 s |
| Zero offset - thermal radiation (at 200 W/m²) |
< 7 W/m² |
| Zero offset - temperature change (5 K/h) |
< 2 W/m² |
| Directional response (up to 80° with 1000 W/m² beam) | < 10 W/m² |
| Temperature dependence of sensitivity (-10ºC to +40ºC) | < 1 % |
| Operational temperature range | -40°C to +80°C |
| Field of view | 180° |
| Maximum solar irradiance | 4000 W/m² |
| Overall accuracy | ± 2 % |
