First class pyranometer with 4-20 mA transmitter

SR11-TR is a solar radiation sensor that is applied in general high accuracy observations. SR11-TR pyranometer complies with the first class specifications of the ISO 9060 standard and the WMO Guide. It houses a 4-20 mA transmitter for easy read-out by dataloggers commonly used in the industry.

  • It houses a 4-20 mA transmitter for easy read-out by dataloggers commonly used in the industry
  • Using SR11-TR is easy


SR11-TR measures the solar radiation received by a plane surface from a 180o field of view angle. This quantity, expressed in W/m2 is called “hemispherical” solar radiation. SR11-TR pyranometer can be employed outdoors under the sun, as well as indoors with lamp-based solar simulators. Its orientation depends on the application and may be horizontal, tilted (for plane of array radiation) or inverted (reflected radiation).

Using SR11-TR is easy. The pyranometer can be connected directly to commonly used data logging systems. The irradiance in W/m2 is calculated by using the transmitter’s output. In SR11-TR’s standard configuration, the 4 to 20 mA output corresponds to a transmitted range of 0 to 1600 W/m2. This range can be adjusted at the factory upon request.

Choosing the Right Instrument
Pyranometers are subject to classification in three classes according to ISO 9060. From second class to first class and from first class to secondary standard, achievable accuracy improves by a factor 2. Measurement accuracy does not only depend on instrument properties, but also on measurement conditions. A very accurate instrument will quickly underperform without a regular schedule of maintenance.  Whatever your application is: Hukseflux offers the highest accuracy in every class at the most attractive price level.

Suggested Use

  • PV system performance monitoring
  • general solar resource monitoring
  • meteorological networks
  • building physics

Areas of Application

  • Meteorology / surface energy flux measurement
  • Solar energy / PV system performance monitoring


  • longer cable, in multiples of 5 metres
  • internal temperature sensor
  • adapted transmitted range



hemispherical solar radiation





ISO 9060:2018 classification

spectrally flat Class B (first class)

IEC 61724-1:2017 compliance

Class C


4-20 mA current loop

Calibration uncertainty

< 1.8 % (k = 2)

Calibration traceability

to WRR

Spectral range

285 to 3000 x 10⁻⁹ m

Transmitted range

0 to 1600 W/m²

Rated operating temperature range

-40 to +80 °C

Temperature response

< ± 2 % (-10 to +40 °C)

Standard cable length

5 m


• Longer cable, in multiples of 5 metres
• Internal temperature sensor
•Adapted transmitted range


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