DR30-D1 pyrheliometer

Next level digital first class pyrheliometer

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The new next level DR30 pyrheliometer by Hukseflux

Welcome to the next level in solar radiation monitoring! DR30 is a high-accuracy digital direct (normal incidence) solar radiation sensor. The scientific name of this instrument is pyrheliometer. DR30 complies with the first class specifications of the ISO 9060 standard and the WMO Guide. This next level pyrheliometer has superior window heating that leads to high data availability, and an internal tilt sensor to check tracker performance.

The all-digital DR30-D1 pyrheliometer offers the highest accuracy and highest data availability, featuring window heating at low offsets. At the same heating power, the heating has been improved with a factor 4, at 4 times lower offsets! DR30 also offers on-board tilt and humidity sensors. It is applied in high accuracy measurement of the solar radiation received by a plane surface from a 5 ° full field of view angle. This quantity, expressed in W/m2, is called “direct” solar radiation or DNI (direct normal irradiance). It is necessary to keep the instrument pointed at the sun by using a two-axis tracker.

Heated for high data availability

High data availability is attained by heating of the front window. This suppresses dew and frost deposition.

  • low power consumption: DR30 needs only 2 W to keep its window free from dew and frost (For the effect of heating on data availability, see the image below: DR30 on the right versus an unheated sensor on the left. More images can be found in the Gallery).

Remote sensor diagnostics

In addition to solar irradiance, DR30 outputs sensor diagnostics such as:

  • tilt angle
  • internal humidity
  • heater current

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

Liabilities covered: test certificates

Each DR30 is supplied with test results for the individual instrument:

  • sensitivity
  • response time
  • temperature response
  • tilt angle measurement

DR30 use and design

DR30 pyrheliometer is used in tracker-mounted operation. DR30 can be connected directly to commonly used data logging systems. It offers a digital output via Modbus RTU over 2-wire RS-485. The pyrheliometer features a precision ground and polished quartz window, a compact sized collimated tube and a thermopile sensor with black coated surface.

Suggested use

  • solar energy surveys
  • solar resource assesments
  • meteorological networks
  • sites with dew and frost problems

Hukseflux Sensor Manager software

For communication between a PC and DR30, the Hukseflux Sensor Manager software is included. It allows the user to plot and export data, and change the DR30 Modbus address and communication settings. Also, the digital outputs may be viewed for sensor diagnostics.


  • longer cable; 10 and 20 metres
  • 20 metres extension cable with 2 connectors


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