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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 pyranometer houses a 4-20 mA transmitter for easy read-out by dataloggers commonly used in the industry. SR20-TR measures the solar radiation received by a plane surface, […]
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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 pyranometer houses a 4-20 mA transmitter for easy read-out by dataloggers commonly used in the industry. SR20-TR measures the solar radiation received by a plane surface, in W/m2, from a 180o field of view angle. 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.
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.
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.
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.
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.
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