ASTM_E_2758_-_15a.pdf

Designation:E275815aStandard Guide forSelection and Use of Wideband,Low Temperature InfraredThermometers1This standard is issued under the fixed designation E2758;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 guide covers electronic instruments intended formeasurement of temperature by detecting intensity of thermalradiation exchanged between the subject of measurement andthe sensor.1.2 The devices covered by this guide are referred to as IRthermometers.1.3 The IR thermometers covered in this guide are instru-ments that are intended to measure temperatures below 1000Cand measure a wide band of thermal radiation in the infraredregion.1.4 This guide covers best practice in using IR thermom-eters.It addresses concerns that will help the user make bettermeasurements.It also provides graphical tables to help deter-mine the accuracy of measurements.1.5 Details on the design and construction of IR thermom-eters are not covered in this guide.1.6 This guide does not cover medium-and high-temperature IR thermometry(above 1000C).It does notaddress the use of narrowband IR thermometers.1.7 The values of quantities stated in SI units are to beregarded as the standard.The values of quantities in parenthe-ses are not in SI and are optional.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E1256 Test Methods for Radiation Thermometers(SingleWaveband Type)E1862 Practice for Measuring and Compensating for Re-flected Temperature Using Infrared Imaging RadiometersE1897 Practice for Measuring and Compensating for Trans-mittance of an Attenuating Medium Using Infrared Imag-ing RadiometersE1933 Practice for Measuring and Compensating for Emis-sivity Using Infrared Imaging Radiometers2.2 IEC Standards:3IEC 62492-1 TS Industrial Process Control DevicesRadiation ThermometersPart 1:Technical Data forRadiation Thermometers2.3 BIPM Standards:JCGM 200:2012 International Vocabulary of MetrologyBasic and General Concepts and Associated Terms(VIM)3.Terminology3.1 Definitions:3.1.1 absolute zero,na temperature of 0 K(-273.15C).3.1.2 atmospheric attenuation,na ratio showing howmuch thermal radiation in a given spectral range is absorbed orscattered in air over a given distance.3.1.3 atmospheric transmission,na ratio showing howwell thermal radiation in a given spectral range at a givendistance travels through a certain distance of air.3.1.4 attenuating medium,na semi-transparent solid,liq-uid or gas,such as a window,filter,external optics,or anatmosphere that reduces thermal radiation,or combinationsthereof.3.1.5 background radiationsee reflected radiation.1This guide is under the jurisdiction of ASTM Committee E20 on TemperatureMeasurement and is the direct responsibility of Subcommittee E20.02 on RadiationThermometry.Current edition approved May 1,2015.Published May 2015.Originallyapproved in 1910.Last previous edition approved in 2015 as E2758 15.DOI:10.1520 E2758-15A.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 Electrotechnical Commission(IEC),3,Rue deVaremb,CH-1211 Geneva 20,Switzerland,www.iec.ch.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.6 blackbody,nthe perfect or ideal source of thermalradiant power having a spectral distribution described byPlancks Law.3.1.7 blackbody simulator,na device with an emissivityclose to unity that can be heated or cooled to a stabletemperature.3.1.8 calibration adjustment,nthe correction to an IRthermometer based on its calibration.3.1.9 center wavelength,nthe simple average of the lowerand upper spectral range limits.3.1.10 celestial radiation,nflux coming from the sky.3.1.11 contact thermometer,nan instrument that isadapted for measuring temperature by means of thermalconductance by determining the temperature at the momentwhen negligible thermal energy flows between the thermom-eter and the object of measurement.3.1.12 dew point,nthe temperature at which water vaporcondenses into liquid water.3.1.13 diffuse reflector,na surface that produces a diffuseimage of a reflected source.3.1.14 distance ratio,nthe ratio of the measuring distanceto the diameter of the field-of-view,when the target is infocus.43.1.15 electromagnetic radiation,nphysically occurringradiant flux classified according to wa