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Hukseflux SR20 Pyranometer

Collect solar irradiance data with class A (secondary standard) accuracy using the Hukseflux SR20 Pyranometer.

  • Hukseflux SR20 Pyranometer
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Recommended when measurement accuracy is the top priority, the Hukseflux SR20 is a thermopile pyranometer that is compliant with the highest category in the ISO 9060 standard: class A (Secondary Standard).

This high-accuracy thermopile-based sensor measures global horizontal irradiance (GHI) and has a spectrally flat response across the full solar spectrum. The SR20 generates a small voltage signal that is proportional to the solar radiation flux, expressed in W/m^2.

The SR20 is compatible with all Symphonie series data loggers when equipped with a Symphonie® SCM Card (SCM #6646, used with the SymphoniePLUS®3 Data Logger and older) or Pro Signal Conditioning Module (P-SCM #9128, used with the SymphoniePRO Data Logger).

This sensor comes with a full sensor-specific characterization to the parameters of ISO 9060, calibration certificate, sun screen, and 5 m (16.4') cable. Note that as with all thermopile pyranometers, regularly scheduled maintenance is imperative to achieve the sensor’s specified performance.

  Hukseflux SR20 Thermopile Pyranometer (#10533)
Sensor type Thermopile solar radiation sensor; ISO 9060:2018 ‘Class A’ (Secondary Standard) compliant
  • Solar resource assessment and monitoring
  • Meteorological studies
  • Environmental monitoring
Sensor range 0 W/m2 to 4000 W/m2
Spectral range 285 nm to 3000 nm
Instrument compatibility All NRG Symphonie series loggers with:
  • P-SCM (#9128) for SymphoniePRO
  • Thermopile SCM (#6646) for earlier models (logger measurement range 0 W/m2 to 1500W/m2)
Output signal  
Signal type Microvolt proportional to total solar radiation
Transfer function Included on calibration certificate; for use with NRG Symphonie see application note "Using Thermopile Pyranometers on Symphonie Loggers"
Accuracy Class A (Secondary Standard) per ISO 9060:2018
Calibration Calibration sheet included with each sensor defines output in microvolts per Watt/m2; traceable to World Radiometric Reference (WRR)
Calibration uncertainty < 1.2% (k=2) as specified by Hukseflux
Output signal range -0.1 mV to + 50 mV
Drift Less than 0.5% per year
Power requirements  
Power Required Zero (passive sensor)
Mounting Mounts to tower using NRG's Mounting Plate | Pyranometer, Gen II (14357) or Mounting Plate | Pyranometer, Gen I (14502)
Tools required
  • 2.5 mm Hex Key
  • 5/16 inch (8 mm) wrench or nut driver
Operating temperature range -40 °C to 80 °C (-40 °F to 176 °F)
Operating humidity range 0 to 100%
Connections Bare wire leads from cable connect directly to logger
see also logger user's manual for wiring diagram
Cable length 5 m (16.4 feet)
Weight 1.2 kg (2.6 lbs)
Dimensions 150 mm X 85 mm (5.9 inches X 3.3 inches)
Cable Removable 5 m signal cable with molded Binder style four pole M12 connector (4-conductor cable with shield; included with connector)
Detector Thermopile
Enclosure IP67 weatherproof anodized aluminum enclosure and stainless steel hardware

Customer Service

+1 802-482-2255

Mon – Fri: 8:30am – 5:00pm Eastern Time (GMT-5)

Symphonie® SCM Card

Symphonie® SCM Card

Condition your sensor’s output signal so that a SymphoniePLUS3 Data Logger can read it by installing a Symphonie Signal Conditioning Module (SCM).

Mounting Platform | 2xGHI for 2.2m Tower

Mounting Platform | 2xGHI for 2.2m Tower

Discontinued product. See below for details.