Apogee Instruments SP-522 Gebruikershandleiding - Pagina 4
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INTRODUCTION
Solar radiation at Earth's surface is typically defined as total radiation across a wavelength range of 280 to 4000
nm (shortwave radiation). Total solar radiation, direct beam and diffuse, incident on a horizontal surface is defined
as global shortwave radiation, or shortwave irradiance (incident radiant flux), and is expressed in Watts per square
-2
meter (W m
, equal to Joules per second per square meter).
Pyranometers are sensors that measure global shortwave radiation. Apogee SP-500 series pyranometers are
blackbody thermopile pyranometers, and are sensitive to most of the solar spectrum, thus eliminating spectral
errors associated with silicon-cell pyranometers. The SP-522 is designed to measure incoming shortwave radiation
and combines a diffuser with the blackbody detector and has calibrations traceable to Class A blackbody
thermopile pyranometers traceable to the world radiation reference in Davos, Switzerland. Specifications compare
favorably to specifications for World Meteorological Organization (WMO) moderate and good quality
classifications and specifications for International Organization of Standardization (ISO) Class C and Class B
classifications.
Typical applications of pyranometers include incoming shortwave radiation measurement in agricultural,
ecological, and hydrological weather networks and solar panel arrays.
Apogee Instruments SP-522 pyranometers consist of a thermopile detector, acrylic diffuser, heater, and signal
processing circuitry mounted in an anodized aluminum housing, and a cable to connect the sensor to a
measurement device. Sensors are potted solid with no internal air space and are designed for continuous
measurement of shortwave radiation in outdoor environments. The SP-522 model outputs a digital signal using
Modbus RTU communication protocol over RS-232 or RS-485.