SR20

Secondary Standard Pyranometer

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. SR20 secondary standard pyranometer enables you to attain the highest measurement accuracy and excels in demanding applications. After a thorough programme of acceptance testing, SR20 was released February 2013. It offers analogue millivolt output.

  • Highest category in the ISO 9060 classification system
  • Low temperature dependence makes it an ideal candidate for use under very cold and very hot conditions
  • Uses a state of the art thermopile sensor with black coated surface, two domes and an anodized aluminum body
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Description

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

Accessories

  • VU01
  • AMF02
  • SHR02
  • PMF01
  • PMF02
  • VMA01

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

Downloads

Download Product Brochure

Download Product Manual

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