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Important features :
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The SMP 3 is a Smart pyranometer (ISO 9060:2018 - spectrally flat, class C / formerly ISO 9060:1990 second class) with low maintenance and industry standard digital and analogue amplified outputs. Based on the proven CMP 3 technology, the SMP 3 adds Modbus® interface, 0 - 1 V or 4 - 20 mA analogue output, improved response time and temperature corrected measurement data. The wide and low power supply range from 5 to 30 VDC makes integration in meteorological stations easy. The SMP 3 is protected against over voltage, reversed polarity and short circuiting. Because all SMP’s have identical sensitivity and connections, exchanging instruments during recalibration is easy.
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.
SMP 3 measures global solar radiation on a horizontal plane. When tilted with the same angle as a PV panel, it measures the tilted global radiation for PV module efficiency calculations.
SmartExplorer Windows™ software for data logging, display of data and Modbus® address setting, can be downloaded from the Kipp & Zonen / Ott HydroMet webpage.
Specifications
| Spectral range (50% points) | 300 to 2800 nm |
| Response time (63%) | 1,5 s |
| Response time (95%) | 12 s |
| Zero offset - thermal radiation (at 200 W/m²) |
< 15 W/m² |
| Zero offset - temperature change (5 K/h) |
< 5 W/m² |
| Directional response (up to 80° with 1000 W/m² beam) | < 20 W/m² |
| Temperature dependence of sensitivity (-20ºC to +50ºC) | < 3 % |
| 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 | ± 10 % |
