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Important features :
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The CGR 4 pyrgeometer is an instrument for the highest quality scientific measurements. The specially designed meniscus dome provides a 180º field of view with negligible directional response error. A hard-carbon coating on the outside of the dome smoothes the spectral response and provides extra protection to the silicon surface. The excellent thermal stability of the dome construction and coupling to the instrument body eliminates the need for dome temperature measurements or dome shading. CGR 4 can be fitted with the CVF 4 ventilation unit to further improve its performance.
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.
Specifications
| Spectral range (50% points) | 4,5 to 42 µm = 4500 to 42000 nm |
| Sensitivity | 5 to15 µV/W/m² |
| Response time |
< 18 s |
| Window heating offset (@ 0 - 1000 W/m²) |
< 4 W/m² |
| Zero offset B | < 2 W/m² |
| Temperature dependence of sensitivity (-10ºC to +50ºC) | < 1 % |
| Operational temperature range | -40...+80°C |
| Field of view | 180° |
| Non-linearity | < 1 % |
| Net irradiance range | -250...+250 W/m² |
| Overall accuracy | ± 1 % |
