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Important features :
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The SGR 3 is a pyrgeometer, designed for meteorological measurements of downward atmospheric long wave radiation. The SGR 3 uses a specially designed silicon window. On the inside a solar-blind filter blocks solar radiation. The SGR 3 data represents the radiation exchange within the whole hemisphere. This is because the reference SGR 3 is calibrated outdoors with respect to a reference CGR 4, which has a 180 degrees field of view.
The SGR 3 has Modbus® interface, amplified analogue output, improved response time and temperature corrected measurement data. The long wave net- and downward radiation are directly available over Modbus®. The wide and low power supply range from 5 to 30 VDC makes integration in meteorological and solar energy stations easy. The SGR 3 is extremely robust and comes with 5 years warranty.
The base of the instruments contains the mounting holes, a spirit level and levelling feet for exact levelling. For ease of mounting, exchange and recalibration the instruments have a waterproof connector. The improved temperature dependency and directional response make these instruments the ideal choice for meteorological and agricultural applications.
Thanks to standardized output and connections of every SGR 3, exchanging instruments for recalibration is easy.
SmartExplorer Windows™ software for data logging, display of data and Modbus® address setting is provided as standard.
Specifications
| Spectral range (overall) | 4,4 to 50 µm = 4400 to 50000 nm |
| Response time (95%) | < 18 s |
| Window heating offset | < 15 W/m² |
| Zero offset B | < 5 W/m² |
| Temperature dependence of sensitivity (-10ºC to +40ºC) | < 3 % |
| Operational temperature range | -40°C to +80°C |
| Field of view | 150° |
| Non-linearity | < 1 % |
| Analogue output (-V version) | 0 - 1 V (-250...+250 W/m²) |
| Analogue output (-A version) | 4 - 20 mA (-250...+250 W/m²) |
| Digital output | 2-wire RS-485 |
| Overall accuracy | ± 5 % |
