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SR20 Solar Radiation Sensor

Updated:2023-05-31

Brand: Hukseflux
Model：SR20
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 meas
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SR20 Solar Radiation Sensor Description： User's Manual Datasheet

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.

Suggested Use

PV system performance monitoring

Scientific meteorological observations

Reference instrument for comparison

Extreme climates (tropical / polar)

Areas of Application

Meteorology / surface energy flux measurement

Solar energy / PV system performance monitoring

SR20 Solar Radiation Sensor Specifications：

Measurand	hemispherical solar radiation
ISO 9060:2018 classification	spectrally flat Class A (secondary standard)
IEC 61724-1:2017 compliance	Class A (when used with VU01)
Application	National Meteorological Networks, PV monitoring commercial and utility scale, PV monitoring small sized, meteorology / climatology, other
Heater	Yes
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
Version order codes	SR20-T1, SR20-T2
Options	• Longer cable, in multiples of 5 metres • VU01 ventilation unit is designed for use with SR20 Pyranometer