ASTM_D_5110_-_22a.pdf

Designation:D511022aStandard Practice forCalibration of Ozone Monitors and Certification of OzoneTransfer Standards Using Ultraviolet Photometry1This standard is issued under the fixed designation D5110;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 covers a means for calibrating ambient,workplace,or indoor ozone monitors,and for certifyingtransfer standards to be used for that purpose.1.2 This practice describes means by which dynamicstreams of ozone in air can be designated as primary ozonestandards.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.See Section 8 for specific precautionary statements.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1356 Terminology Relating to Sampling and Analysis ofAtmospheresD3195 Practice for Rotameter CalibrationD3249 Practice for General Ambient Air Analyzer Proce-duresD3631 Test Methods for Measuring Surface AtmosphericPressureD5011 Practices for Calibration of Ozone Monitors UsingTransfer StandardsE220 Test Method for Calibration of Thermocouples ByComparison TechniquesE591 Practice for Safety and Health Requirements Relatingto Occupational Exposure to Ozone(Withdrawn 1990)3E644 Test Methods for Testing Industrial Resistance Ther-mometers3.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,refer to Terminology D1356.3.2 Definitions of Terms Specific to This Standard:3.2.1 primary standard,na standard directly defined andestablished by some authority,against which all secondarystandards are compared.3.2.2 secondary standard,na standard used as a means ofcomparison,but checked against a primary standard.3.2.3 standard,nan accepted reference sample or deviceused for establishing measurement of a physical quantity.3.2.4 transfer standard,na type of secondary standard.Itis a transportable device or apparatus that,together withoperational procedures,is capable of reproducing pollutantconcentration or producing acceptable assays of pollutantconcentrations.3.2.5 zero air,npurified air that does not contain ozone,and does not contain any other component that may interferewith the measurement(see 7.1).4.Summary of Practice4.1 This practice is based on the photometric assay of ozone(O3)concentrations in a dynamic flow system.The concentra-tion of O3in an absorption cell is determined from a measure-ment of the amount of 253.7 nm light absorbed by the sample.This determination requires knowledge of(1)the absorptioncoefficient of O3at 253.7 nm,(2)the optical path lengththrough the sample,(3)the transmittance of the sample at a1This practice is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.03on AmbientAtmospheres and Source Emissions.Current edition approved Sept.1,2022.Published September 2022.Originallyapproved in 1990.Last previous edition approved in 2022 as D5110 22.DOI:10.1520/D5110-22A.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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1wavelength of 253.7 nm,and(4)the temperature and pressureof the sample.The transmittance is defined as the ratio:I/Iowhere:I=the intensity of light that passes through the cell and issensed by the detector when the cell contains an O3sample,andIo=the intensity of light that passes through the cell and issensed by the detector when the cell contains zero air.It is assumed that all conditions of the system,except for thecontents of the absorptio