Analogue first class pyranometer with heater

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 offers analogue millivolt output.

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


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’s zero offset a is 5 W/m² unventilated. SR15-A1’s response time is < 10 s, a significant improvement relative to earlier sensors.

Suggested Use

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

Areas of Application

  • Building physics / insulation, thermal comfort and energy budget measurement
  • Meteorology / surface energy flux measurement
  • Solar energy / PV system performance monitoring


  • AMF03 mounting fixture
  • SHR02 shadow ring
  • PMF01 mounting fixture
  • PMF02 mounting fixture
  • CMF01 mounting fixture



Hemispherical solar radiation

ISO 9060:2018

Spectrally flat Class B (first class)

IEC 61724-1:2017 compliance

Class B


National Meteorological Networks, PV monitoring commercial and utility scale, PV monitoring small sized, meteorology / climatology, other





Calibration uncertainty

< 1.8 % (k = 2)

Calibration traceability

to WRR

Spectral range

285 to 3000 x 10⁻⁹ m


10 x 10⁻⁶ V/(W/m²)

Analog Output


Respnse Time

< 10 s

Zero offset a

5 W/m² unventilated

Rated operating temperature range

-40 to +80 °C

Temperature response

< ± 2 % (-10 to +40 °C)

Standard cable length

5 m


optional spring-loaded levelling, with or without tube mount

Version order codes

SR15-A1, SR15-A1-LM01, SR15-A1-TLM01, SR15-A1-S7-8.5


• 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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