DR02 pyrheliometer

Fast response first class pyrheliometer

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DR02 is a high-accuracy direct (normal incidence) solar radiation sensor with a short response time. The scientific name of this instrument is pyrheliometer. DR02 complies with the first class specifications of the ISO 9060 standard and the WMO Guide. Its fast response makes it very suitable for PV (photovoltaics)-related applications. DR02 pyrheliometer has a heated window and is used in tracker-mounted operation.

DR02 is a solar radiation sensor that 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 direct normal irradiance (DNI). Pyrheliometers like DR02 are generally employed outdoors under the sun. It is necessary to keep the instrument pointed at the sun by using a two-axis tracker.

Due to its short response time, DR02 is ideally suited for concentrated PV or concentrated thermal applications, where it will match the response time of the panel or receiver. Typical DR02 applications are solar energy resource assessment and system performance monitoring (in particular for concentrated solar energy), scientific solar climate observations and outdoor material testing.

Besides its short response time, DR02 offers more advantages over competing models: DR02 window assembly is equipped with a heater which reduces measurement errors caused by (early-morning) dew deposition. DR02 can be connected directly to commonly used data logging systems. The irradiance in W/m2 is calculated by dividing the instrument output, a small voltage, by the sensitivity. This sensitivity is provided with DR02 on its product certificate. DR02 pyrheliometer is optionally equipped with a temperature sensor and is optionally characterised for its temperature dependence. This can be used to increase the accuracy of the measurement.

Click on drawing in Gallery for overview of DR02 pyrheliometer: (1) humidity indicator, (2) sights, (3) aperture tube, (4) protection cap, (5) window with heater, (6) cable gland, (7) cable

Suggested Use

  • outdoor PV / CPV and CSP system performance monitoring
  • solar energy surveys
  • solar resource assessments
  • meteorological networks


  • longer cable, in multiples of 5 m
  • internal temperature sensor
  • temperature dependence characterisation
  • various tracking solutions can be offered by Hukseflux

See also

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