SR30 pyranometer

Next level digital secondary standard pyranometer with RVH technology

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SR30-D1 ventilated and heated secondary standard digital pyranometer

Welcome to the next level in solar radiation monitoring! The all-digital SR30 pyranometer offers the highest accuracy and highest data availability: featuring new Recirculating Ventilation and Heating (RVHTM) technology, SR30 outperforms all pyranometers equipped with traditional ventilation systems. It is the first pyranometer compliant in its standard configuration with Class A requirements of the new IEC 61724-1 standard. SR30 is "Secondary Standard" in the ISO 9060:1990 standard and "Spectrally Flat Class A" in the upcoming ISO 9060:2018 revision; the highest class in all cases. It is the ideal instrument for use in PV system performance monitoring and meteorological networks. SR30 offers several advantages over competing pyranometers:

Heated for high data availability, featuring new RVHTM technology

High data availability is attained by heating of the outer dome using ventilation between the inner and outer dome. RVHTM - Recirculating Ventilation and Heating - technology, developed by Hukseflux, suppresses dew and frost deposition and is as effective as traditional ventilation systems, without the maintenance hassle and large footprint.


The dome of SR30 pyranometer is heated by ventilating the area between the inner and outer dome. RVHTM is much more efficient than traditional ventilation, where most of the heat is carried away with the ventilation air. Recirculating ventilation is as effective in suppressing dew and frost deposition at 2 W as traditional ventilation is at 10 W. RVHTM technology also leads to a reduction of zero offsets.

Compliant with IEC 61724-1:2017 Class A and B

IEC 61724-1: Photovoltaic System Performance Monitoring - Guidelines for Measurement, Data Exchange and Analysis - requires ventilation and heating for Class A monitoring. Only SR30 offers both, without the need for additional accessories. Most competing pyranometers do not even comply with Class B, which requires heating.

Low cost of ownership

SR30 is an affordable secondary standard instrument and is designed for low cost of ownership. It offers low demand on infrastructure, reduction of unnecessary on-site inspection by remote diagnostics, and efficient servicing by design. All sensors are supported by a worldwide calibration and maintenance organisation offering local support.

Remote sensor diagnostics

In addition to solar irradiance, SR30 outputs sensor diagnostics such as:

  • tilt angle
  • internal ventilator speed (RPM)
  • internal humidity
  • heater current

Remote diagnostics permits real-time status monitoring, reducing the need for (un)scheduled field inspections.

Liabilities covered: test certificates

As required by ISO 9060 for secondary standard classification, each SR30 is supplied with test results for the individual instrument:

  • sensitivity
  • directional response
  • temperature response
  • tilt angle measurement

Suggested use

  • PV system performance monitoring
  • scientific meteorological observations

SR30 design

SR30 pyranometer measures the solar radiation received by a plane surface, in W/m2, from a 180 o field of view angle. It employs a state-of-the-art thermopile sensor with black coated surface, two domes and an anodised aluminium body. The pyranometer dome is heated by ventilating the area between the inner and outer dome using RVH TM - Recirculating Ventilation and Heating - technology . SR30 offers a digital output via Modbus RTU over 2-wire RS-485. For communication between a PC and SR30, the Hukseflux Sensor Manager software is included.There are 2 mounting options available for SR30: they allow for simplified mounting, levelling and instrument exchange on a flat surface or a tube.


  • spring-loaded levelling mount
  • tube levelling mount with set of bolts
  • longer cable; 10 and 20 metres
  • 20 metres extension cable with 2 connectors

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