Next level digital first class 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 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.

  • ISO spectrally flat Class A
  • Low power consumption: DR30 needs only 2 W to keep its window free from dew and frost
  • Highest accuracy and highest data availability, featuring heating at low offsets, and on-board tilt and humidity sensors


DR30 Next Level Digital First Class 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 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

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.

Suggested Use

  • Solar energy surveys
  • Solar resource assessments
  • Meteorological networks
  • Sites with dew and frost problems

Areas of Application

Solar energy / PV system performance monitoring


Sensor Manager



Direct solar radiationsensor tilt angle

ISO classification

Spectrally flat Class A pyrheliometer

Calibration uncertainty

< 1.2 % (k = 2)

Tilt measurement uncertainty

± 1 ° (0 to 180 °)



Response time (95 %)

4 s

Full field of view angle

5 °

Slope angle

1 °

- 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



Irradiance in W/m²
Instrument body temperature in °C,
Tilt angle in °
Internal humidity in %,
Heater current in mA

Communication protocol

Modbus / over 2-wire RS-485

Transmission mode



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


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Download Product Manual

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