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DR30-D1 pyrheliometer

Next level digital spectrally flat Class A pyrheliometer

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 spectrally flat Class A specifications of the ISO 9060:2018 standard. This next level pyrheliometer has superior window heating that leads to high data availability, and an internal tilt sensor to check tracker performance.


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DR30 next level digital spectrally flat Class A pyrheliometer

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 a 4 times lower offset! 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.
Power consumption is low: DR30 needs only 2 W to keep its window free from dew and frost.

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.

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.
Using DR-series pyrheliometers offer significant benefits over the use of competing models. The all-digital DR30 pyrheliometer offers the highest accuracy and highest data availability, featuring heating at low offsets, and on-board tilt and humidity sensors. The advantages of having a heater and a tilt sensor are demonstrated in the DR30-D1 brochure (PDF).


Measurand direct solar radiation
ISO classification spectrally flat Class A pyrheliometer
Calibration uncertainty < 1.2 % (k = 2)
Tilt measurement uncertainty ± 1 ° (0 to 180 °)
Heating included
Response time  (95 %) 4 s
Full field of view angle 5 °
Slope angle 1 °
Power consumption :
– standard operating mode 2 W
– low power operating mode 0.1 W
Zero offset < ± 1 W/m²
Calibration traceability to WRR
Spectral range 200 to 4000 x 10⁻⁹ m
Rated operating temperature range -40 to +80 °C
Temperature response < ± 0.4 % (-30 to +50 °C)
Temperature response test of individual instrument report included
Tilt sensor test of individual instrument report included
Rated operating voltage 7 to 30 VDC
Standard cable length 5 m
Digital output :
Output: irradiance in W/m²
Output: instrument body temperature in °C
Output: tilt angle in °
Output: internal humidity in %
Output: heater current in mA
Communication protocol Modbus / over 2-wire RS-485
Transmission mode RTU
  • longer cable; 10 and 20 metres
  • 20 metres extension cable with 2 connectors


Suggested use

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