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SR20-TR pyranometer

SR20-TR pyranometer
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Thermal Sensors Secondary standard pyranometer with 4-20 mA transmitter SR20-TR is a solar radiation sensor of the highest category in the ISO 9060 classification system: secondary standard. It should be used where highest measurement accuracy is required. SR20-TR houses a 4-20 mA transmitter for easy read-out by dataloggers commonly used in the industry. Introduction SR20-TR measures the solar radiation received by a plane surface, in W/m2, from a 180o field of view angle. SR20-TR enables you to attain the highest measurement accuracy and excels in demanding applications. Output of the sensor is 4-20 mA, complying with industry standards. After a thorough programme of acceptance testing, SR20-TR secondary standard pyranometer was released February 2013. Improved measurement accuracy Figure 1 SR20-TR secondary standard pyranometer with 4-20 mA transmitter Figure 2 overview of SR20-TR: (1) cable, (2) fixation of sun screen, (3) inner dome, (4) thermal sensor with black coating, (5) outer dome, (6) sun screen, (7) humidity indicator, (8) desiccant holder, (9) transmitter housing, (10) bubble level, (11) levelling feet, (12) connector 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 SR20-TR’s low temperature dependence makes it an ideal candidate for use under very cold and very hot conditions. 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. The incorporated heater reduces measurement errors caused by early-morning dew deposition. Operation Using SR20-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 SR20-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. Copyright by Hukseflux. Version 1302. We reserve the right to change specifications without prior notice Page 1/2. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com

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Thermal Sensors SR20-TR design SR20-TR pyranometer uses a state of the art thermopile sensor with black coated surface, two domes and an anodised aluminium body, which also houses the transmitter. The connector, desiccant holder and sun screen fixation are ultra robust and designed for industrial use. All parts are specified for use across SR20-TR’s entire rated operating temperature range. hemispherical solar radiation ISO classification secondary standard pyranometer Calibration uncertainty < 1.2 % (k = 2) Zero offset 5 W/m2 unventilated Calibration traceability to WRR Spectral range 285...

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