Description
SMP21 Pyranometer from Kipp and Zonen
The SMP21 pyranometer is a secondary standard pyranometer that combines the sensor technology from the CMP21 but an RS-485 Modbus interface along with analogue output. With internal desiccant and robust build quality, the SMP21 is very low maintenance.
The SMP21 has Modbus® RTU interface, amplified analogue output, improved response time and individual temperature corrected measurement data. The SMP21 is supplied with individual measured cosine response data. The wide and low power supply range from 5 to 30VDC makes integration in meteorological and solar energy stations easy. The SMP21 is protected against over voltage, reversed polarity and short circuiting.
SMP21 specifications
| Spectral range (50% points) | 285 to 2800 nm |
| Sensitivity | 7 to 14 µV/W/m² |
| Response time | 5 s |
| Zero offset A | < 7 W/m² |
| Zero offset B | < 2 W/m² |
| Directional response (up to 80° with 1000 W/m² beam) | < 10 W/m² |
| Temperature dependence of sensitivity (-20 ºC to +50 ºC) | < 1 % |
| Operational temperature range | -40 °C to +80 °C |
| Maximum solar irradiance | 4000 W/m² |
| Field of view | 180 ° |
