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SR15-A1 pyranometer

Analogue first class pyranometer with heater

Back to overview

SR15-A1 is a high-accuracy solar radiation sensor. It is” First Class” according to the ISO 9060:1990 standard and “Spectrally Flat Class B” in the 2018 revision. With its on-board heater, it is compliant in its standard configuration with the requirements for “Class B” PV monitoring systems of the new IEC 61724-1:2017 standard. SR15-A1 measures the solar radiation received by a plane surface from a 180 o field of view angle. This quantity, expressed in W/m2 , is called “hemispherical” solar radiation. SR15-A1 pyranometer can be employed outdoors under the sun, as well as indoors with lamp-based solar simulators. Its orientation depends on the application and may be horizontal, tilted (for plane of array radiation) or inverted (for reflected radiation).

PV system performance monitoring: compliant with IEC class B

IEC 61724-1: Photovoltaic System Performance Monitoring - Guidelines for Measurement, Data Exchange and Analysis - requires heating for Class B monitoring. SR15-A1, with its on-board heater, offers Class B compliance without the need for additional accessories.

Improved measurement accuracy

Calibration of SR15-A1 pyranometer has been improved; our latest calibration method results in an uncertainty of the sensitivity of 1.8 %, compared to typical uncertainties of higher than 2.8 % for this pyranometer class. SR15-A1 response time is < 10 s, and its zero offset a is 5 W/m2 unventilated; significant improvements relative to earlier sensors.

SR15-A1 pyranometer design

SR15-A1 first class pyranometer with heater employs a thermal sensor with black coating, two glass domes and an anodised aluminium body.

Suggested use

  • PV system performance monitoring
  • general solar resource monitoring
  • indoor simulated solar testing
  • meteorological networks

Your benefits

  • best measurement accuracy in first class
  • improved response time
  • with on-board heater: compliant with IEC 61724-1 Class B in its standard configuration


  • adapted sensitivity range
  • spring-loaded levelling; practical for easy mounting, levelling and instrument exchange on flat surfaces
  • tube levelling mount with set of bolts
  • with PMF01 pyranometer mounting fixture
  • longer cable; 10 and 20 metres length
  • 20 metres extension cable with 2 connectors

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