ASTM E2758-22

Standard Guide for Selection and Use of Infrared Thermometers

SIGNIFICANCE AND USE
4.1 This guide provides guidelines and basic test methods for the use of infrared thermometers. The purpose of this guide is to provide a basis for users of IR thermometers to make more accurate measurements, to understand the error in measurements, and reduce the error in measurements.
SCOPE
1.1 This guide covers electronic instruments intended for measurement of temperature by detecting intensity of thermal radiation exchanged between the subject of measurement and the sensor.  
1.2 The devices covered by this guide are referred to as IR thermometers.  
1.3 The IR thermometers covered in this guide are instruments that are intended to measure temperatures below 2700 °C and measure a narrow to wide band of thermal radiation in the infrared region.  
1.4 This guide covers best practice in using IR thermometers. It addresses concerns that will help the user make better measurements. It also provides graphical tables to help determine the accuracy of measurements.  
1.5 Details on the design and construction of IR thermometers are not covered in this guide.  
1.6 This guide addresses general information on emissivity and how to deal with emissivity when making measurements with an IR thermometer.  
1.7 This guide contains basic information on the classification of different types of IR thermometers.  
1.8 The values of quantities stated in SI units are to be regarded as the standard. The values of quantities in parentheses are not in SI and are optional.  
1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Sep-2022
• ICS: 17.200.20 - Temperature-measuring instruments
• Technical Committee: E20 - Temperature Measurement
• Drafting Committee: E20.02 - Radiation Thermometry

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E2758 − 22
Standard Guide for
1
Selection and Use of Infrared Thermometers
This standard is issued under the fixed designation E2758; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This guide covers electronic instruments intended for
measurement of temperature by detecting intensity of thermal
2. Referenced Documents
radiation exchanged between the subject of measurement and
2
2.1 ASTM Standards:
the sensor.
E1256Test Methods for Radiation Thermometers (Single
1.2 The devices covered by this guide are referred to as IR
Waveband Type)
thermometers.
E1862Practice for Measuring and Compensating for Re-
1.3 The IR thermometers covered in this guide are instru-
flected Temperature Using Infrared Imaging Radiometers
ments that are intended to measure temperatures below E1897Practice for Measuring and Compensating for Trans-
2700°C and measure a narrow to wide band of thermal mittance of anAttenuating Medium Using Infrared Imag-
radiation in the infrared region. ing Radiometers
E1933Practice for Measuring and Compensating for Emis-
1.4 This guide covers best practice in using IR thermom-
sivity Using Infrared Imaging Radiometers
eters. It addresses concerns that will help the user make better
3
2.2 IEC Standards:
measurements. It also provides graphical tables to help deter-
IEC 62492-1 TS Industrial Process Control Devices—
mine the accuracy of measurements.
Radiation Thermometers—Part 1: Technical Data for
1.5 Details on the design and construction of IR thermom-
Radiation Thermometers
eters are not covered in this guide.
2.3 BIPM Standards:
1.6 This guide addresses general information on emissivity JCGM 200:2012International Vocabulary of Metrology—
and how to deal with emissivity when making measurements Basic and General Concepts andAssociatedTerms (VIM)
with an IR thermometer.
3. Terminology
1.7 This guide contains basic information on the classifica-
3.1 Definitions:
tion of different types of IR thermometers.
3.1.1 absolute zero, n—a temperature of 0 K (–273.15 °C).
1.8 The values of quantities stated in SI units are to be
3.1.2 atmospheric attenuation, n—a ratio showing how
regarded as the standard. The values of quantities in parenthe-
muchthermalradiationinagivenspectralrangeisabsorbedor
ses are not in SI and are optional.
scattered in air over a given distance.
1.9 This standard does not purport to address all of the
3.1.3 atmospheric transmission, n—a ratio showing how
safety concerns, if any, associated with its use. It is the
well thermal radiation in a given spectral range at a given
responsibility of the user of this standard to establish appro-
distance travels through a certain distance of air.
priate safety, health, and environmental practices and deter-
3.1.4 attenuating medium, n—a semi-transparent solid, liq-
mine the applicability of regulatory limitations prior to use.
uid or gas, such as a window, filter, external optics, or an
1.10 This international standard was developed in accor-
atmosphere that reduces thermal radiation, or combinations
dance with internationally recognized principles on standard-
thereof.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
3.1.5 background radiation—see reflected radiation.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This guide is under the jurisdiction ofASTM Committee E20 on Temperature contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Measurement and is the direct responsibility of Subcommittee E20.02 on Radiation Standards volume information, refer to the standard’s Document Summary page on
Thermometry. the ASTM website.
3
Current edition approved Oct. 1, 2022. Published November 2022. Originally Available from International Electrotechnical Commission (IEC), 3, rue de
approved in 1910. Last previous edition approved in 2021 as E2758–15A(2021). Varembé, 1st floor, P.O. Box 131, CH-1211, Geneva 20, Switzerland, https://
DOI:10.1520/E2758-22. www.iec.ch.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E2758 − 22
3.1.6 blackbody, n—the perfect or ideal source of thermal 3.1.22 infrared reflector, n—a material with a reflectance in
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E2758 − 15a (Reapproved 2021) E2758 − 22
Standard Guide for
Selection and Use of Wideband, Low Temperature Infrared
1
Thermometers
This standard is issued under the fixed designation E2758; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This guide covers electronic instruments intended for measurement of temperature by detecting intensity of thermal radiation
exchanged between the subject of measurement and the sensor.
1.2 The devices covered by this guide are referred to as IR thermometers.
1.3 The IR thermometers covered in this guide are instruments that are intended to measure temperatures below 1000 °C 2700 °C
and measure a narrow to wide band of thermal radiation in the infrared region.
1.4 This guide covers best practice in using IR thermometers. It addresses concerns that will help the user make better
measurements. It also provides graphical tables to help determine the accuracy of measurements.
1.5 Details on the design and construction of IR thermometers are not covered in this guide.
1.6 This guide does not cover medium- and high-temperature IR thermometry (above 1000 °C). It does not address the use of
narrowband IR thermometers.addresses general information on emissivity and how to deal with emissivity when making
measurements with an IR thermometer.
1.7 This guide contains basic information on the classification of different types of IR thermometers.
1.8 The values of quantities stated in SI units are to be regarded as the standard. The values of quantities in parentheses are not
in SI and are optional.
1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.10 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1
This guide is under the jurisdiction of ASTM Committee E20 on Temperature Measurement and is the direct responsibility of Subcommittee E20.02 on Radiation
Thermometry.
Current edition approved May 1, 2021Oct. 1, 2022. Published June 2021November 2022. Originally approved in 1910. Last previous edition approved in 20152021 as
E2758 – 15A. DOI:10.1520A (2021). DOI:10.1520/E2758-22.⁄E2758-15AR21.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E2758 − 22
2. Referenced Documents
2
2.1 ASTM Standards:
E1256 Test Methods for Radiation Thermometers (Single Waveband Type)
E1862 Practice for Measuring and Compensating for Reflected Temperature Using Infrared Imaging Radiometers
E1897 Practice for Measuring and Compensating for Transmittance of an Attenuating Medium Using Infrared Imaging
Radiometers
E1933 Practice for Measuring and Compensating for Emissivity Using Infrared Imaging Radiometers
3
2.2 IEC Standards:
IEC 62492-1 TS Industrial Process Control Devices—Radiation Thermometers—Part 1: Technical Data for Radiation Ther-
mometers
2.3 BIPM Standards:
JCGM 200:2012 International Vocabulary of Metrology—Basic and General Concepts and Associated Terms (VIM)
3. Terminology
3.1 Definitions:
3.1.1 absolute zero, n—a temperature of 0 K (–273.15 °C).
3.1.2 atmospheric attenuation, n—a ratio showing how much thermal radiation in a given spectral range is absorbed or scattered
in air over a given distance.
3.1.3 atmospheric transmission, n—a ratio showing how well thermal radiation in a given spectral range at a given distance travels
through a certain distance of air.
3.1.4 attenuating medium, n—a semi-transparent solid, liquid or gas, such as a window, filter, external optics, or an atmosphere
that reduces thermal radiation, or combinations thereof.
3.1.5 background radiation—see reflected radiation.
3.1.6 blackbody, n—the perfect or ideal source of thermal radiant power having a spectral distribution described by Planck’s Law.
3.1.7 blackbody simulator, n—a
...