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SR15-D1 pyranometer

Digital first class pyranometer with Modbus over TTL and 4-20 mA output
SR15 digital pyranometer series is an all-digital range of solar radiation sensors applied in general high-accuracy observations. SR15 pyranometers comply with the “first class” specifications according to the ISO 9060:1990 standard and “spectrally flat class B” requirements in the 2018 revision. Version SR15-D2A2 offers Modbus over TTL, and 4-20 mA current loop output.

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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-D1, with its on-board heater, offers Class B compliance without the need for additional accessories.

SR15 digital series design

SR15 first class pyranometer employs a thermal sensor with black coating, two glass domes and an anodised 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).



Measurand hemispherical solar radiation
ISO 9060:2018 classification spectrally flat Class B (first class)
IEC 61724-1:2017 compliance Class B
Application National Meteorological Networks
Heater yes
Output Modbus RS-485
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)
Heater 1.5 W at 12 VDC
Standard cable length 5 m
Levelling optional spring-loaded levelling, with / without tube mount
Output :
Communication protocol Modbus over 2-wire RS-485
Transmission mode RTU
Output irradiance in W/m² and instrument body temperature in °C
On-board heater included
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


Suggested use

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