The Most Reliable and Accurate Pyranometer Available – The SMP22

The SMP22 is a secondary standard pyranometer that integrates a new smart interface containing the sensor technology and quartz domes from the CMP22. This pyranometer has a well-established track record of decades, making it the most precise and dependable pyranometer. The SMP22 has decreased thermal offsets, improved directional response, and the broadest spectral range.

The directional error is decreased below 5 W/m2, thanks to the superior optical quality of the domes. The SMP22 is provided with the RS-485 Modbus® interface as a standard feature.

The SMP22 is provided with internal desiccant that will last for at least a decade, significantly reducing maintenance. Fitting the SMP22 with a CVF4 ventilation unit can increase the interval for dome cleaning and maximize the quality of the measurements.

The SMP22 has a digital interface and is supplied with individually measured cosine response data. The broad and low power supply range of 5-30 VDC enables incorporation into solar energy and meteorological stations simple. The SMP22 is provided with a five-year warranty.

The SMP22 comes as standard with the SmartExplorer Windows™ software for data logging, data display, and Modbus® address setting.

Key Features

The main features of the SMP22 pyranometer are as follows:

  • ISO 9060 Secondary Standard
  • Most accurate pyranometer currently available
  • Lowest directional error < 5 W/m²
  • Individual temperature correction from -40°C to +80°C
  • No change of desiccant for 10 years
  • RS-485 Modbus® communication


Spectral range (20% point) 190-4000 nm
Spectral range (50% points) 200-3600 nm
Response time (95%) < 2s
Digital output 2-wire RS-485
Zero offset A < 3 W/m²
Zero offset B < 1 W/m²
Directional response (up to 80° with 1000 W/m² beam) < 5 W/m²
Temperature dependence of sensitivity (-40°C to +70°C) < 0.3 %
Temperature dependence of sensitivity (-20ºC to +50ºC) < 0.3 %
Analogue output (-A / -V version) 4-20 mA / 0 to 1 V

The Most Reliable and Accurate Pyranometer Available – The SMP22


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