ISO 17034 and ISO 17025 table of ranges and uncertainties for hydrogen-enriched fuel gases

This table was reviewed on 11 November 2022 and refers to EffecTech’s ISO 17034 scope (Issue No. 004) for Certified Reference Materials and ISO 17025 scope (Issue No. 057) for Calibrated Gas Mixtures.

Certified Reference Materials (CRMs)

All CRM mixtures are issued with a ISO 17034 certificate and an ISO 17025 certificate. To find out why, see our page on calibration gas certificates.

Component	range	calibration and measurement capability (CMC)*
	amount fraction (% mol/mol)	amount fraction (% mol/mol)
hydrogen	0.1 to 20	0.25 % relative + 0.0020
nitrogen	0.1 to 12	0.25 % relative + 0.0005
carbon dioxide	0.1 to 8	0.2 % relative + 0.0002
methane	35 to 100	0.11 – 0.10 % relative
ethane	0.1 to 20	0.25 % relative + 0.0005
propane	0.1 to 8	0.3 % relative + 0.0001
iso-butane	0.02 to 0.15 0.15 to 1.2	0.00045 0.3 % relative
n-butane	0.02 to 0.15 0.15 to 1.2	0.00045 0.3 % relative
neo-pentane	0.01 to 0.35	0.7 % relative + 0.0001
iso-pentane	0.01 to 0.35	0.5 % relative + 0.0001
n-pentane	0.01 to 0.35	0.5 % relative + 0.0001
n-hexane	0.001 to 0.35	1.0 % relative + 0.0001
2-methylpentane	0.001 to 0.35	1.3 % relative + 0.00005
3-methylpentane	0.001 to 0.35	1.3 % relative + 0.00005
2,2-dimethylbutane	0.001 to 0.35	1.3 % relative + 0.00005
benzene	0.001 to 0.2	1.3 % relative + 0.00005
cyclohexane	0.001 to 0.2	1.3 % relative + 0.00005
n-heptane	0.001 to 0.2	1.3 % relative + 0.00005
toluene	0.001 to 0.1	1.3 % relative + 0.00005
methylcyclohexane	0.001 to 0.1	1.3 % relative + 0.00005
n-octane	0.0005 to 0.05	1.3 % relative + 0.00005
n-nonane	0.0005 to 0.02	1.3 % relative + 0.00005
n-decane	0.0005 to 0.005	1.3 % relative + 0.00005
	amount fraction (µmol/mol or % mol/mol)	amount fraction (% µmol/mol)
oxygen	10 to 100 100 to 1000 0.1 % to 1.0 % 1.0 % to 22.5 %**	1.6 % relative + 0.1 0.9 % relative + 0.5 0.7 % relative + 1.0 0.18 % relative + 30