ISO 6974-6:2002 – Determination of Natural Gas Composition with Defined Uncertainty

Analyzer Description

4-valves, 5-capillary columns, methanizer, TCD, FID, FID, LTM Series II
Sample type:
Natural gas
Compounds Separated:
Methane, ethylene, ethane/acetylene composite, propylene, propane, isobutane, n-butane, neopentane, isopentane, n-pentane, 2,2-dimethylbutane, 2-methylpentane/2,3-dimethylbutane/cyclopentane composite, 3-methylpentane, n-hexane, benzene, cyclohexane, n-heptane, toluene, n-octane, ethylbenzene, m-xylene/p-xylene composite, n-nonane, o-xylene

Hydrogen, helium, oxygen, nitrogen, carbon dioxide, carbon monoxide
Concentration Range:
20 ppm to 5,000 ppm for helium
20 ppm to 5,000 ppm for hydrogen
70 ppm to 50,000 ppm for oxygen
70 ppm to 400,000 ppm for nitrogen
40 mol% to 100 mol% for methane
10 ppm to 10,000 ppm for carbon monoxide
10 ppm to 100,000 ppm for carbon dioxide
10 ppm to 5,000 ppm for acetylene, ethylene, propylene
20 ppm to 150,000 ppm for ethane
10 ppm to 50,000 ppm for propane
1 ppm to 10,000 ppm for n-butane, isobutane
1 ppm to 5,000 ppm for all remaining components
Methods met:
ISO 6974-6, Wasson-ECE W4151

Typical Chromatogram

FID Chromatogram

TCD Chromatogram

FID Chromatogram


Key Features and Benefits

  • ISO 6974-6:2002 recommends using two separate gas chromatographs in series, Wasson-ECE Instrumentation performs the analysis on a single gas chromatograph using three unique thermal zones.
  • On-board regulators ensure that flow is consistent.
  • Argon and nitrogen carrier gases are used.