Posted in | Pyranometers

The Most Accurate and Reliable Pyranometer Available – The SMP22

The SMP22 is a secondary standard pyranometer, which integrates the new smart interface with sensor technology and quartz domes from the CMP22. It has a well-established track record, making it the world’s most precise and dependable pyranometer. The SMP22 has the widest spectral range, better directional response, and decreased thermal offsets. Its internal desiccant is built to last for at least a decade, reducing maintenance greatly.

It is possible for the interval for dome cleaning to be extended, and for the quality of measurements to be increased further by equipping the SMP22 with a CVF4 ventilation unit. The SMP22 has individual temperature corrected measurement data, a digital interface, and improved response time. It is provided with individually measured cosine response data. The broad and low power supply range of 5-30 VDC enables easy integration of solar energy and meteorological stations.

Standardized output and connections of all SMP22s allow an easy exchange of instruments for recalibration. The SmartExplorer Windows™ software is a standard feature provided for data logging, data display and Modbus® address setting.

Key Features

The main features of the SMP22 are as follows:

  • ISO 9060 secondary standard
  • The most precise pyranometer currently available
  • Very robust
  • Amplified analog output
  • Lowest directional error <5 W/m²
  • There is no need to change the desiccant for 10 years
  • Individual temperature correction from -40°C to +80°C
  • RS-485 Modbus® communication
  • The highest optical quality domes enables the lowest directional error down to 5 W/m2
  • As a standard feature, RS-485 Modbus® interface is provided


The main specifications of the SMP22 are listed below:

Spectral range (20% point) 190-4000 nm
Spectral range (50% points) 200-3600 nm
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
Response time (95%) <2 s
Analogue output (-A / -V version) 4-20 mA / 0-1 V
Temperature dependence of sensitivity (-20 ºC to +50 ºC) < 0.3%
Temperature dependence of sensitivity (-40 °C to +70 °C) < 0.3%

The Most Accurate and Reliable Pyranometer Available – The SMP22


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