Digital First class Pyranometer with Modbus over RS-485 Output and Heater

SR15 digital pyranometer series is a range of high-accuracy digital solar radiation sensors. It is “first class” according to the WMO guide and ISO 9060:1990 standard and “Spectrally Flat Class B” in the 2018 revision. Version SR15-D1, equipped with an on-board heater, is compliant in its standard configuration with the requirements for “Class B” PV monitoring systems of the IEC 61724-1:2017 standard. SR15-D1 offers Modbus over RS-485 output.

  • Best measurement accuracy in first class
  • Improved response time
  • With SR15-D1’s on-board heater: compliant in its standard configuration with IEC 61724-1 Class B
  • On-board calibration history


SR15 first class pyranometer with tube levelling mountPV 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-D1, with its on-board heater, offers Class B compliance without the need for additional accessories.

SR15 Digital Series DesignSR15-D1 offers Modbus over RS-485 output

SR15 first class pyranometer employs a thermal sensor with black coating, two glass domes and an anodized aluminium body. The digital sensor offers output via Modbus RTU over 2-wire RS-485 (version SR15-D1) and via Modbus TTL and 4-20 mA current loop (version SR15-D2A2).

Suggested Use

  • PV system performance monitoring
  • General solar resource monitoring
  • Indoor simulated solar testing
  • Meteorological networks

Areas of Application

  • 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 classification

spectrally flat Class B (first class)

IEC 61724-1:2017 compliance

Class B


National Meteorological NetworksPV 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

Response 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)


1.5 W at 12 VDC

Standard cable length

5 m


optional spring-loaded levelling, with / without tube mount

Communication protocol

Modbus over 2-wire RS-485

Transmission mode



irradiance in W/m² and instrument body temperature in °C

On-board heater


Version order codes

SR15-D1, SR15-D1-LM01, SR15-TLM01


• Spring-loaded levelling; practical for easy mounting, levelling and instrument exchange on flat surfaces (LM01)
• Tube levelling mount with set of bolts (TLM01)
• PMF01 bracket for tilted installations
• Longer cable; 10 and 20 metres length
• 20 metres extension cable with 2 connectors


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