ASTM_D_3249_-_95_2019.pdf

Designation:D324995(Reapproved 2019)Standard Practice forGeneral Ambient Air Analyzer Procedures1This standard is issued under the fixed designation D3249;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This practice is a general guide for ambient air analyzersused in determining air quality.1.2 The actual method,or analyzer chosen,depends on theultimate aim of the user:whether it is for regulatorycompliance,process monitoring,or to alert the user of adversetrends.If the method or analyzer is to be used for federal orlocal compliance,it is recommended that the method publishedor referenced in the regulations be used in conjunction with thisand other ASTM methods.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.For specific hazard statements,see Section 6.1.5 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 ofAtmospheresD1357 Practice for Planning the Sampling of the AmbientAtmosphereD3609 Practice for Calibration Techniques Using Perme-ation TubesD3670 Guide for Determination of Precision and Bias ofMethods of Committee D22E177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE200 Practice for Preparation,Standardization,and Storageof Standard and Reagent Solutions for Chemical Analysis3.Terminology3.1 DefinitionsFor definitions of terms used in this prac-tice other than those following,refer to Terminology D1356.3.1.1 analyzer,nthe instrumental equipment necessary toperform automatic analysis of ambient air through the use ofphysical and chemical properties and giving either cyclic orcontinuous output signal.3.1.1.1 analyzer system,nall sampling,analyzing,andreadout instrumentation required to perform ambient air qualityanalysis automatically.3.1.1.2 sample system,nequipment necessary to providethe analyzer with a continuous representative sample.3.1.1.3 readout instrumentation,noutput meters,recorder,or data acquisition system for monitoring analytical results.3.1.2 full scale,nthe maximum measuring limit for agiven range of an analyzer.3.1.3 interference,nan undesired output caused by asubstance or substances other than the one being measured.The effect of interfering substance(s),on the measurement ofinterest,shall be expressed as:(6)percentage change ofmeasurement compared with the molar amount of the interfer-ent.If the interference is nonlinear,an algebraic expressionshould be developed(or curve plotted)to show this varyingeffect.3.1.4 lag time,nthe time interval from a step change in theinput concentration at the analyzer inlet to the first correspond-ing change in analyzer signal readout.3.1.5 linearity,nthe maximum deviation between an ac-tual analyzer reading and the reading predicted by a straightline drawn between upper and lower calibration points.Thisdeviation is expressed as a percentage of full scale.1This practice is under the jurisdiction ofASTM Committee D22 on Air Qualityand is the direct responsibility of Subcommittee D22.03 on Ambient Atmospheresand Source Emissions.Current edition approved Oct.1,2019.Published October 2019.Originallyapproved in 1973.Last previous edition approved in 2011 as D3249 95(2011).DOI:10.1520/D3249-95R19.2For 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.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.1 3.1.6 minimum detection limit,nthe smallest input con-centration that can be determined as the concentration ap-proaches zero.3.1.7 noise,nran