DANSK DS/EN ISO 6975 PDF

This standard describes the specifications for the quantitative analysis of the following components of natural gas:
helium
hydrogen
argon
oxygen
nitrogen
carbon dioxide
saturated hydrocarbons from C1 to C5
hydrocarbon fractions from C6 upwards
aromatic compounds as benzene and toluene

The gas-chromatographic methods determine the components in the following ranges:
oxygen: 0,001 % (n/n) to 0,5 % (n/n)
helium: 0,001 % (n/n) to 0,.5 % (n/n)
hydrogen: 0,001 % (n/n) to 0,5 % (n/n)
argon: 0,01 % (n/n) to 0,5 % (n/n)
nitrogen: 0,001 % (n/n) to 40 % (n/n)
carbon dioxide: 0,001 % (n/n) to 40 % (n/n)
methane: 50 % (n/n) to 100 % (n/n)
ethane: 0,02 % (n/n) to 15 % (n/n)
propane: 0,001 % (n/n) to 5 % (n/n)

higher hydrocarbons: The method can measure hydrocarbon components from 10-6 (n/n) up to their maximum concenrration, which is compatible with the requirement that the gas is free from hydrocarbon condensate at any pressure in the range 1 x 10 2 kPa to 7 x 10 3 kPa.

This method is not intended for the determination of oxygen compiounds (water vapour, methanol, glycols) or sulfur compounds.