SR20-T2-L

ISO Class A Pyranometer with 10K Thermistor
SR20-T2-L

SR20-T2-L

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ISO Class A Pyranometer with 10K Thermistor

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Model:
SR20-T2-L
Item Number:
32308
Warranty:
5 years
Lead time:
14 days

Overview

SR20-T2-L Hukseflux Secondary Standard Pyranometer w/10K Thermistor

The SR20-T2, manufactured by Hukseflux Thermal Sensors, is an ISO 9060:2018 spectrally flat Class A (secondary standard) pyranometer that measures solar short-wave radiation in a full hemisphere of the sky. It has a built-in case temperature sensor and embedded heater for removing dew and light rain. It connects directly to a Campbell Scientific data logger and is designed for applications that require high measurement accuracy in demanding applications such as scientific meteorological observation networks and utility scale solar-energy-power production sites.

Key Advantages

High Measurement Accuracy
Ideal for PV system performance monitoring

Technical Description

The SR20-T2 pyranometer measures the hemispherical solar radiation received by a plane surface, in W/m2, from a 180° field of view. The SR20 can be deployed indoors with lamp-based solar simulators or more commonly outdoors under the sun. Its orientation depends on the application and may be installed horizontally, tilted for plane or array irradiance, positioned on a sun tracker with shadow-ring for diffuse measurements, or inverted for reflected radiation.

The SR20-T2’s low temperature dependence makes it an ideal candidate for use under very cold and very hot conditions. The temperature dependence of each instrument is tested and supplied as a second-degree polynomial. This information can be used for further reduction of temperature dependence during post-processing.

The SR20 is equipped with an internal temperature sensor. Campbell Scientific supplies the T2 version, which has a 10 kohm thermistor. The T1 version, in contrast, has a PT100 and is available upon request. 

The embedded heater reduces measurement errors caused by early-morning dew deposition. Campbell Scientific recommends using the instrument in accordance with the recommended practices of ISO, WMO and ASTM.

The output of the SR20-T2 is analog. The SR20-D2-L model, in contrast, offers two other types of commonly used irradiance outputs: digital via Modbus RTU over 2-wire RS-485, and analog 4 to 20 mA output (current loop).

Benefits

  • Low temperature dependence
  • Embedded 1.5 W heater to reduce effects of dew deposition
  • Embedded 10K temperature sensor
  • Ultra robust connector, desiccant holder, and sun screen
  • Temperature dependence characterized and supplied for each instrument
  • Directional response tested on each instrument

Specifications

Sensor
High-quality blackened thermopile protected by two glass domes
Measurement Description
Measures hemispherical solar radiation
ISO Classification
Spectrally flat Class A (secondary standard) pyranometer

(ISO 9060:2018 )

WMO Performance Level
High-quality pyranometer
Response Time
3 s

(95%)

Zero Offset A
5 W/m2 (unventilated), 2.5 W/m2 (ventilated)

(response to 200 W/m2 net thermal radiation)

Zero Offset B
≤ -2 W/m2

(response to 5 K/h change in ambient temperature)

Non-Stability
≤ -0.5% change per year
Non-Linearity
≤ -0.2%

(100 to 1000 W/m2)

Directional Response
< ±10 W/m2
Spectral Selectivity
< ±3%

(0.35 to 1.5 x 10-6 m)

Temperature Response
< ±1% (-10° to +40°C), < 0.4% (-30° to +50°C)

with correction in data processing

Tilt Response
< ±0.2%

(0 to 90° at 1000 W/m2)

Heater
1.5 W

(at 12 Vdc)

Steady-state Zero Offset
0 to -8 W/m2

(caused by heating)

Calibration Uncertainty
< 1.2%

(k=2)

Level Accuracy
< 0.1°

(bubble entirely in ring)

Sensor Resistance Range
100 to 200 ohm
Operating Temperature Range
-40° to +80°C
Field of View (FOV)
180°
Measurement Range
0 to 4000 W/m2
Sensitivity
7 to 25 x 10-6 V/(W/m2)
Spectral Range
285 to 3000 x 10-9 m

(20% transmission points)

Related Resources

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General: (435) 227-9000
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Corporate Address
815 W 1800 N
Logan, UT 84321
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Email Address
sales@campbellsci.com

As a trusted leader in measurement systems for more than 50 years, our top priority at Campbell Scientific has always been to provide the most accurate, reliable data for research and industry.