DR20-A1 pyrheliometer

DR20-A1 analogue spectrally flat Class A pyrheliometer with heating
DR20 pyrheliometer with superior window heating for the best DNI solar data
DR20-A1 pyrheliometers and SR15-A1 pyranometers on a typical solar monitoring station
DR20 with window heating for use in tracker mounted operation
Analogue spectrally flat Class A pyrheliometer, with heating

DR20-A1 is a high-accuracy direct (normal incidence) solar radiation sensor, or pyrheliometer. DR20 pyrheliometer complies with the Class A specifications of the ISO 9060 standard. It has a better temperature response than DR15-A1, which is a spectrally flat Class B pyrheliometer. These instruments are used in tracker-mounted operation, and offer analogue millivolt outputs. DR-series pyrheliometers have superior window heating that leads to high data availability.

Specifications
Measurand
  • direct solar radiation
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Specifications

Measurand
  • direct solar radiation
ISO classification
  • spectrally flat Class A
Calibration uncertainty
  • < 1.2 % (k = 2)
Heating
  • included
Heater
  • 1 W at 12 VDC
Response time (95 %)
  • 4 s
Full field of view angle
  • 5 °
Slope angle
  • 1 °
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
  • < ± 0.5 % (-10 to +40 °C)
Temperature response
  • < ± 0.4 % (-30 to +50 °C) with correction in data processing
Calibration certificate
  • included
Temperature response test of individual instrument
  • report included
Standard cable length
  • 5 m
Manuals & Downloads

Description

DR20-A1 analogue spectrally flat Class A pyrheliometer with heating

Hukseflux model DR20 pyrheliometer is an ISO 9060 spectrally flat Class A instrument. Together with DR15 pyrheliometer, it replaces the models DR01, DR02 and DR03. DR20 has a better temperature response than DR15. Both instruments offer 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!

DR20 with window heating for use in tracker mounted operation

DR20 pyrheliometer 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.

DR20-A1 pyrheliometers and SR15-A1 pyranometers on a typical solar monitoring station

A pyrheliometer is used in tracker-mounted operation. DR20-A1 can be connected directly to commonly used data logging systems. It offers analogue output in the millivolt range. The pyrheliometer features a precision ground and polished quartz window, a compact sized collimated tube and a thermopile sensor with black coated surface. High data availability is attained by heating of the front window. This suppresses dew and frost deposition at a very low power consumption: DR20 needs only 1 W to keep its window free from dew and frost.

DR20 pyrheliometer with superior window heating for the best DNI solar data

Using DR20 / DR15 pyrheliometers offer significant benefits over the use of competing models. The pyrheliometers offer the highest accuracy and highest data availability, featuring heating at low offsets. The advantages of having a heater are demonstrated in graphs in the DR20 brochure (PDF).

DR20-A1 pyrheliometer offers the highest accuracy and highest data availability, featuring window heating at low offsets.

As required by ISO 9060 for Class A classification, each DR20 is supplied with test results for the individual instrument:

  • sensitivity
  • response time
  • temperature response

 

Suggested use

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

DR20-A1 pyrheliometer
DR20-A1 analogue spectrally flat Class A pyrheliometer with heating
  • ISO 9060 spectrally flat Class A
  • Heating at low offsets for high data availability
  • Low power consumption
  • Analogue millivolt output
  • Supplied with test report for the individual instrument, including temperature response
Would you like a personalised quote?

or contact us: info@hukseflux.com