ASTM_D_3249_-_95_2011.pdf

Designation:D324995(Reapproved 2011)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 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.For specific hazardstatements,see Section 6.2.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 Definitions:3.1.1 For definitions of terms used in this practice other thanthose following,refer to Terminology D1356.3.1.2 analyzerthe instrumental equipment necessary toperform automatic analysis of ambient air through the use ofphysical and chemical properties and giving either cyclic orcontinuous output signal.3.1.2.1 analyzer systemall sampling,analyzing,and read-out instrumentation required to perform ambient air qualityanalysis automatically.3.1.2.2 sample systemequipment necessary to provide theanalyzer with a continuous representative sample.3.1.2.3 readout instrumentationoutput meters,recorder,or data acquisition system for monitoring analytical results.3.1.3 full scalethe maximum measuring limit for a givenrange of an analyzer.3.1.4 interferencean undesired output caused by a sub-stance or substances other than the one being measured.Theeffect 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.3.1.5 lag timethe time interval from a step change in theinput concentration at the analyzer inlet to the first correspond-ing change in analyzer signal readout.3.1.6 linearitythe maximum deviation between an actualanalyzer reading and the reading predicted by a straight linedrawn between upper and lower calibration points.Thisdeviation is expressed as a percentage of full scale.3.1.7 minimum detection limitthe smallest input concen-tration that can be determined as the concentration approacheszero.3.1.8 noiserandom deviations from a mean output notcaused by sample concentration changes.3.1.9 operating humidity range of analyzerthe range ofambient relative humidity of air surrounding the analyzer,overwhich the analyzer will meet all performance specifications.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.1,2011.Published October 2011.Originallyapproved in 1973.Last previous edition approved in 2005 as D3249 95(2005).DOI:10.1520/D3249-95R11.2For 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 States1 3.1.9.1 operating humidity range of samplethe range ofambient relative humidity of air which passes through theanalyzers sensing system,over which the monitor will meetall performance specifications.3.1.10 operational periodthe period of time over whichthe analyzer can be expected to operate unattended withinspecifications.3.1.11 operating temperature range of analyzerthe rangeof ambient temperatures of air surrounding the analyzer,overwhich the monitor will meet all performance specifications.3.1.11.1 operating temperature range