Hukseflux SR20

SRPyranometer

Description

SR20 is a pyranometer  from Hukseflux of the highest category in the ISO 9060 classification system: secondary standard. This solar radiation sensor is used where the highest measurement accuracy is required. It measures the solar radiation received by a plane surface, in W/m², from a 180 ° field of view angle.

Case Study 2

Norway

Case Study 6

Germany

Case Study 7

Egypt

PRODUCT UPDATES

Product Description

SR20 is a pyranometer of the highest category in the ISO 9060 classification system: secondary standard. This solar radiation sensor is used where the highest measurement accuracy is required. It measures the solar radiation received by a plane surface, in W/m², from a 180 ° field of view angle.

Improved measurement accuracy

In order to improve overall measurement accuracy, Hukseflux effectively targeted two major sources of measurement uncertainty: calibration and “zero offset a”.

The initial calibration uncertainty is reduced to less than 1.2 %, an improvement of 15 % relative to competing models. The “zero offset a” specification of SR20 is 5 W/m² unventilated. Competing models state 12 W/m² unventilated and 7 W/m² ventilated.

Demanding applications

The temperature dependence of every individual instrument is tested and supplied as a second degree polynomial. This information can be used for further reduction of temperature dependence during post-processing. SR20’s low temperature dependence makes it an ideal candidate for use under very cold and very hot conditions. The incorporated heater reduces measurement errors caused by early-morning dew deposition.

SR20 pyranometer design

SR20 pyranometer uses a state of the art thermopile sensor with black coated surface, two domes and an anodized aluminum body. The connector, desiccant holder and sun screen fixation are ultra-robust and designed for industrial use. All parts are specified for use across SR20’s entire rated operating temperature range.

Measurand:Hemispherical solar radiation
Application:
  • National Meteorological Networks
  • PV monitoring commercial and utility scale
  • PV monitoring small sized
  • Meteorology / climatology
  • Other
Heater:Yes
ISO 9060:2018 classification:Class A (secondary standard)
IEC 61724-1:2017 compliance:Class A (when used with VU01)
Output:mV
Calibration uncertainty:< 1.2 % (k = 2)
Zero offset a:5 W/m² unventilated
Calibration traceability:to WRR
Spectral range:285 to 3000 x 10⁻⁹ m
Sensitivity (nominal):15 x 10⁻⁶ V/(W/m²)
Rated operating temperature range:-40 to +80 °C
Standard cable length:5 m
Temperature response:<± 1 % (-10 to +40 °C) and <± 0.4 % (-30 to +50 °C) with correction in data processing
Temperature response test of individual instrument:report included
Directional response test of individual instrument:report included
Temperature sensor:Pt100 or 10 kΩ thermistor
Heater:1.5 W at 12 VDC

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