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Important features :
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The SMP 21 is a secondary standard pyranometer that combines the sensor technology from the CMP 21 with the RS-485 Modbus® interface, analogue output, low maintenance and 5 year warranty.
The SMP 21 has an internal desiccant that will last for at least 10 years. This minimizes maintenance significantly.
The interval for dome cleaning can be extended, and the quality of measurements maximized, by fitting SMP 21 with the CVF 4 ventilation unit.
The SMP 21 has Modbus® RTU interface, amplified analogue output, improved response time and individual temperature corrected measurement data. The SMP 21 is supplied with individual measured cosine response data. The wide and low power supply range from 5 to 30 VDC makes integration in meteorological and solar energy stations easy. The SMP 21 is protected against over voltage, reversed polarity and short circuiting.
Thanks to standardized output and connections of every SMP 21, 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 (50% points) | 285 to 2800 nm |
| Response time (63%) | 0,7 s |
| Response time (95%) | 2 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 (-20ºC to +50ºC) | < 0,5% |
| Analogue output (-V version) | 0 - 1 V (-200...2000 W/m²) |
| Analogue output (-A version) | 4 - 20 mA (0...1600 W/m²) |
| Digital output | 2-wire RS-485 |
| Overall accuracy | ± 2% |
