ASTM_D_7941_-_D_7941M_-_14.pdf

Designation:D7941/D7941M14Standard Test Method forHydrogen Purity Analysis Using a Continuous Wave CavityRing-Down Spectroscopy Analyzer1This standard is issued under the fixed designation D7941/D7941M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes contaminant determination infuel-cell-grade hydrogen as specified in relevant ASTM andISO standards using cavity ring-down spectroscopy(CRDS).This standard test method is for the measurement of one ormultiple contaminants including,but not limited to,water(H2O),oxygen(O2),methane(CH4),carbon dioxide(CO2),carbon monoxide(CO),ammonia(NH3),and formaldehyde(H2CO),henceforth referred to as“analyte.”1.2 This test method applies to CRDS analyzers with one ormultiple sensor modules(see 3.3 for definition),each of whichis designed for a specific analyte.This test method describessampling apparatus design,operating procedures,and qualitycontrol procedures required to obtain the stated levels ofprecision and accuracy.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D4150 Terminology Relating to Gaseous FuelsD5287 Practice for Automatic Sampling of Gaseous FuelsD7265 Specification for Hydrogen Thermophysical PropertyTablesD7606 Practice for Sampling of High Pressure Hydrogenand Related Fuel Cell Feed GasesD7649 Test Method for Determination of Trace CarbonDioxide,Argon,Nitrogen,Oxygen and Water in HydrogenFuel by Jet Pulse Injection and Gas Chromatography/Mass Spectrometer AnalysisD7653 Test Method for Determination of Trace GaseousContaminants in Hydrogen Fuel by Fourier TransformInfrared(FTIR)Spectroscopy2.2 ISO Standards:3ISO/DIS 14687-2 Hydrogen fuelProduct specificationPart 2:Proton exchange membrane(PEM)fuel cellapplications for road vehiclesISO/DIS 14687-3 Hydrogen fuelProduct SpecificationPart 3:Proton exchange membrane(PEM)fuel cellapplications for stationary appliances2.3 U.S.-Specific Standards:SAE J2719-2011(2011)Hydrogen Fuel Quality for FuelCell Vehicles42.3.7 California Code of Regulations,Title 4,Division 9,Chapter 6,Article 8,Sections 4180-4181 Hydrogen fuelquality requirements5Environmental Protection Agency 40 CFR:Protection of theEnvironment,Appendix B to Part 136 Definition andProcedure for the Determination of the Method DetectionLimit63.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology D4150.3.2 Acronyms:3.2.1 AIST,nNational Institute of Advanced IndustrialScience and Technology1This test method is under the jurisdiction ofASTM Committee D03 on GaseousFuels and is the direct responsibility of Subcommittee D03.14 on Hydrogen andFuel Cells.Current edition approved June 1,2014.Published July 2014.DOI:10.1520/D7941_D7941M-142For 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.3Available from International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,CP 56,CH-1211 Geneva 20,Switzerland,http:/www.iso.org.4Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.5Available from the California Office of Administrative Law,300 Capitol Mall,Suite 1250,Sacramento,CA 95814,http:/www.oal.ca.gov/ccr.htm.6Available from United States Environmental ProtectionAgency(EPA),WilliamJefferson Clinton Bldg.,1200 Pennsylvania Ave.,NW,Washington,DC 20004,http:/www.epa.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.2 CRDS,ncavity ring-down spectroscopy3.2.3 IR,ninfrared3.2.4 kPa,nkilopascal3.2.5 LDL,nlower detection limit3.2.6 MSDS,nmaterial safety data sheet3.2.7 NIST,nNational Institute of Standards and Technol-ogy3.2.8 NPL,nNational Physical Laboratory3.2.9 ppb,nparts per billion v/v3.2.10 ppm,nparts per million v/v3.2.11 PTB,nPhysikalisch-Technische Bundesanstalt3.2.12 psig,npounds per square inch(gauge)3.2.13 slpm,nstandard liters per minute3.2.14 v/v,nvolume/volume ratio3.2.15 VCR,na type of compression gas fitting3.3 Additional DefinitionsThe“sensor module”consi