1、Designation:D429804(Reapproved 2014)1Standard Guide forIntercomparing Permeation Tubes to Establish Traceability1This standard is issued under the fixed designation D4298;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of la
2、st revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEEditorial corrections were made throughout in December 2014.1.Scope1.1 This guide covers two procedures for establishing thepermeat
3、ion rate of a permeation tube and defining the uncer-tainty of the rate by comparison to National Institute ofStandards and Technologys Standard Reference Materials(SRM).1.2 Procedure A consists of a direct comparison of thepermeation rate of the device undergoing calibration with thatof an SRM.1.3
4、Procedure B consists of a gravimetric calibration pro-cess in which a certified permeation tube is used as a qualitycontrol for the measurements.1.4 Both procedures are limited to the case where a suitablecertified permeation device is available.1.5 The values stated in SI units are to be regarded a
5、sstandard.No other units of measurement are included in thisstandard.1.6 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 app
6、lica-bility of regulatory limitations prior to use.(See 8.2 on SafetyPrecautions.)2.Referenced Documents2.1 ASTM Standards:2D1356 Terminology Relating to Sampling and Analysis ofAtmospheresD3249 Practice for General Ambient Air Analyzer Proce-duresD3609 Practice for Calibration Techniques Using Perm
7、e-ation TubesD3631 Test Methods for Measuring Surface AtmosphericPressureE1 Specification for ASTM Liquid-in-Glass ThermometersE319 Practice for the Evaluation of Single-Pan MechanicalBalancesE617 Specification for Laboratory Weights and PrecisionMass Standards3.Terminology3.1 Definitions:3.1.1 For
8、definitions of terms used in this guide,refer toTerminology D1356.3.2 Definitions of Terms Specific to This Standard:3.2.1 working standarda standard used in the laboratoryor field for periodic standardization of a measuring instrument.4.Summary of Guide4.1 Procedure AA certified SRM permeation sour
9、ce,ob-tained from the National Institute of Standards and Technologyis used to calibrate a continuous analyzer.The analyzer is thenused to measure the concentration of a gaseous mixturegenerated from the permeation tube under calibration.Equa-tions are provided that permit calibration of the permeat
10、ion rateof the latter from the test data.4.2 Procedure BThe permeation source is calibrated,gravimetrically,using temperature and mass standards trace-able to NIST standards.The validity of the calibration isconfirmed by concurrently measuring the permeation rate of aCertified Reference Material(CRM
11、).5.Significance and Use5.1 The accuracy of air pollution measurements is directlydependent upon accurate calibrations.5.2 Such measurements gain accuracy and can be intercom-pared when the measurement procedures are traceable tonational measurement standards.5.3 This guide describes procedures for
12、enhancing theaccuracy of air pollution measurements which may be specifiedby those organizations requiring traceability to national stan-dards.1This guide is under the jurisdiction of ASTM Committee D22 on Air Qualityand is the direct responsibility of Subcommittee D22.01 on Quality Control.Current
13、edition approved Dec.1,2014.Published January 2015.Originallyapproved in 1983.Last previous edition approved in 2010 as D4298 04(2010).DOI:10.1520/D4298-04R14E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of A
14、STMStandards 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 6.Apparatus6.1 For apparatus used in the calibration of permeationdevices,refer to Practice D3
15、609.6.1.1 The thermometers used shall conform to SpecificationE1 and shall have calibration certificates traceable to the NIST.Measurement uncertainty should be 0.1C or less.6.1.2 The mercury barometer shall conform to Test MethodsD3631.6.2 Apparatus for Procedure A:6.2.1 Analytical InstrumentsAn an
16、alytical instrument re-sponsive to the permeant with the following minimum perfor-mance specifications:Noise1%of full-scaleZero drift4%of full-scale per daySpan drift3%of full-scale per dayRange0 to 0.5 ppm(or appropriate for source strength)6.2.2 Continuous strip chart recorder with the followingminimum performance specifications:Uncertaintycomponent0.33 (0.25%full-scaledeflection)Chart widthno less than 6 in.Time for full-scale travel1 sNOTE1ISO GUM3points out that with approximately normal pl
