ASTM_G_183_-_15.pdf

Designation:G18315Standard Practice forField Use of Pyranometers,Pyrheliometers and UVRadiometers1This standard is issued under the fixed designation G183;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice describes deployment conditions,mainte-nance requirements,verification procedures and calibrationfrequencies for use of pyranometers,pyrheliometers and UVradiometers in outdoor testing environments.This practice alsodiscusses the conditions that dictate the level of accuracyrequired for instruments of different types.1.2 While both pyranometers and UV radiometers may beemployed indoors to measure light radiation sources,themeasurement of ultraviolet and light radiation in acceleratedweathering enclosures using manufactured light sources gen-erally requires specialized radiometric instruments.Use ofradiometric instrumentation to measure laboratory lightsources is covered in ISO 9370.NOTE1An ASTM standard that is similar to ISO 9370 is underdevelopment and deals with the instrumental determination of irradianceand radiant exposure in weathering tests.1.3 The characterization of radiometers is outside the scopeof the activities required of users of radiometers,as contem-plated by this standard.2.Referenced Documents2.1 ASTM Standards:2E772 Terminology of Solar Energy ConversionG7 Practice for Atmospheric Environmental Exposure Test-ing of Nonmetallic MaterialsG24 Practice for Conducting Exposures to Daylight FilteredThrough GlassG90 Practice for Performing Accelerated Outdoor Weather-ing of Nonmetallic Materials Using Concentrated NaturalSunlightG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic Materials2.2 ISO Standards:3ISO877 PlasticsMethodsofExposuretoDirectWeathering,Indirect Weathering Using Glass-FilteredDaylight and Indirect Weathering by Daylight UsingFresnel MirrorsISO 9060 Solar EnergySpecification and Classification ofInstruments for Measuring Hemispherical Solar and Di-rect Solar RadiationISO 9370 PlasticsInstrumental Determination of RadiantExposure in Weathering TestsGeneral GuidanceISOTR9901 SolarEnergyFieldPyranometersRecommended Practice for Use2.3 WMO Reference:4World Meteorological Organization(WMO),1983“Mea-surement of Radiation,”Guide to Meteorological Instru-ments and Methods of Observation,seventh ed.,WMO-No.8,Geneva3.Terminology3.1 DefinitionsThe definitions given in TerminologiesE772 and G113 are applicable to this practice.4.Radiometer Selection4.1 Criteria for the Selection of Radiometers:4.1.1 There are several criteria that need to be consideredfor selection of the radiometer that will be used:4.1.1.1 Function specific criteria,such as whether apyranometer,pyrheliometer or UV radiometer is required,4.1.1.2 Task specific criteria,such as the accuracy require-ments for the selected incident angle and temperature ranges,and maximum response time,4.1.1.3 Operational criteria,such as dimensions,weight,stability and maintenance,and4.1.1.4 Economic criteria,such as when networks have to beequipped,or whether the instrument is being acquired forinternal reference purposes,or for research purposes,etc.1This practice is under the jurisdiction ofASTM Committee G03 on Weatheringand Durability and is the direct responsibility of Subcommittee G03.09 onRadiometry.Current edition approved Feb.1,2015.Published February 2015.Originallyapproved in 2005.Last previous edition approved in 2010 as G183 05(2010).DOI:10.1520/G0183-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,CP 56,CH-1211 Geneva 20,Switzerland,http:/www.iso.org.4Available from World Meterological Organization,7 bis,avenue de la Paix,CP.2300,CH-1211 Geneva 2,Switzerland,http:/www.wmo.int.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 Selection Related to Radiometer Type:4.2.1 Pyranometers,which measure global solar irradiancein the 300 to 2500 nm wavelength region,are required to assessthe hemispherical solar irradiance on surfaces of test specimensmounted on weathering test racks that are used by the outdoorweathering exposure community.Typically,pyranometers arerequired to measure the exposure levels specified in theapplicable ASTM and/or ISO outdoor weathering standardssuch as those described in Practices G7,G24,G90,and ISO877.4.2.2 Pyrheliometers,which measure direct(or,beam)solarirradiance in the 300 to 2500 nm wavelength region,arerequired to assess the solar irradiance reflected onto the targ