IR02 pyrgeometer
2Pages

Catalog excerpts

Thermal Sensors Pyrgeometer with heater IR02 is a pyrgeometer suitable for longwave irradiance measurements in meteorological applications. The instrument can be heated, which improves measurement accuracy as it prevents dew deposition on its window. Because of features like this, IR02 is popular and often used in agricultural networks. Introduction IR02 measures the longwave or far-infra-red radiation received by a plane surface, in W/m2, from a field of view angle of approximately 150o. Longwave radiation is the part of radiation that is not emitted by the sun. The actual field of view angle of IR02 is not the ideal 180o. The reduction of this field of view makes it possible to offer an instrument at an attractive price level, while the accuracy loss is relatively small. IR02 has a window with a cut-on at 4.5 x 10-6 m, making it suitable for day- and night observations. Benefits IR02 pyrgeometer has a high sensitivity. With sufficient input signal a typical datalogger no longer contributes to the uncertainty of the measurement. IR02 houses an on-board heater. Heating prevents condensation of water on the pyrgeometer window which, when occurring, leads to very large measurement errors. Figure 1 IR02 pyrgeometer with heater Operation Using IR02 is easy. It can be connected directly to commonly used data logging systems. The irradiance in W/m2 is calculated by dividing the IR02 output, a small voltage, by the sensitivity and by taking into account the irradiated heat by the sensor itself (Stefan-Boltzmann law). The sensitivity is provided with IR02 on its product certificate. Figure 2 application example: solar sensor in use for greenhouse climate control; pyrgeometers are used for this application as well. Calibration of pyrgeometers used for downward longwave radiation is traceable to the World Infrared Standard Group (WISG). This calibration takes into account the spectral properties of downward longwave radiation. As an option, calibration can be made traceable to a blackbody and the International Temperature Scale of 1990 (ITS-90). This alternative calibration is appropriate for measurements of upward longwave radiation (with IR02 pyrgeometers facing down). Copyright by Hukseflux. Version 2203. 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 IR02 design IR02 pyrgeometer employs a thermal sensor with black coating, a flat silicon window with solar blind filter and an anodised aluminium body. IR02 specifications Measurand Optional measurand Optional measurand Spectral range IR02 Field of view angle Response time (95 %) Sensitivity (nominal) Rated operating temperature range Temperature dependence Calibration traceability Optional traceability Temperature sensor Heater Standard cable length longwave radiation sky temperature surface temperature 4.5 to 42 x 10-6 m 150 o 18 s 15 x 10-6 V/(W/m2) -40 to +80 oC < ±3 %...

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IR02 pyrgeometer 2Pages

Catalog excerpts

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IR02 pyrgeometer
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