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Calibration Gas Standards For Natural Gas Production & Processing



Calibration Gas Standards for Natural Gas

Natural gas composition varies from source to source and often varies on a daily and seasonal basis. Using a calibration gas that is specifically designed for your application ensures that you will continue to achieve accurate gas quality measurements. CSL’s experienced staff possess over twenty years of experience in the gas industry to design calibration gases to suit each customer’s specific requirements.



Various compositions of Natural Gas Standards are as follows:

Components Con
(% mol/mol)
Amount fraction
(% mol/mol)
Amount fraction
(% mol/mol unless stated as ppm)
Amount fraction
(% mol/mol unless stated as ppm)
Nitrogen 0.02 to 25 ± 0.5 % to ± 1 % 0.1 to 22 ± 0.5 % to ± 1 %
Carbon Dioxide 0.05 to 25 ± 0.5 % to ± 1 % 0.05 to 15 ± 0.5 % to ± 1 %
Methane 34 to 100 ± 0.5 % to ± 1 % 34 to 100 ± 0.5 % to ± 1 %
Ethane 0.1 to 35 ± 0.5 % to ± 1 % 0.1 to 35 ± 0.5 % to ± 1 %
Propane 0.05 to 20 ± 0.5 % to ± 1 % 0.05 to 15 ± 0.5 % to ± 1 %
iso-Butane 0.01 to 2 ± 0.5 % to ± 1 % 0.01 to 0.15 ± 0.5 % to ± 1 %
n-Butane 0.01 to 2 ± 0.5 % to ± 1 % 0.01 to 0.15 ± 0.5 % to ± 1 %
neo-Pentane 0.001 to 0.5 ± 0.5 % to ± 1 % 0.002 to 0.35 ± 0.5 % to ± 1 %
iso-Pentane 0.002 to 0.6 ± 0.5 % to ± 1 % 0.005 to 0.35 ± 0.5 % to ± 1 %
n-Pentane 0.002 to 0.6 ± 0.5 % to ± 1 % 0.005 to 0.35 ± 0.5 % to ± 1 %
n-Hexane 0.001 to 0.5 ± 0.5 % to ± 1 % 0.001 to 0.35 ± 0.5 % to ± 1 %
2-Methylpentane 0.001 to 0.35 ± 0.5 % to ± 1 % 0.001 to 0.35 ± 0.5 % to ± 1 %
3-Methylpentane 0.001 to 0.35 ± 0.5 % to ± 1 % 0.001 to 0.35 ± 0.5 % to ± 1 %
2,2-dimethylbutane 0.001 to 0.35 ± 0.5 % to ± 1 % 0.001 to 0.35 ± 0.5 % to ± 1 %
Benzene 0.001 to 0.2 ± 0.5 % to ± 1 % 0.001 to 0.2 ± 0.5 % to ± 1 %
Cyclohexane 0.001 to 0.2 ± 0.5 % to ± 1 % 0.001 to 0.2 ± 0.5 % to ± 1 %
n-Heptane 0.001 to 0.2 ± 0.5 % to ± 1 % 0.001 to 0.2 ± 0.5 % to ± 1 %
Toluene 0.001 to 0.1 ± 0.5 % to ± 1 % 0.001 to 0.1 ± 0.5 % to ± 1 %
Methylcyclohexane 0.001 to 0.1 ± 0.5 % to ± 1 % 0.001 to 0.1 ± 0.5 % to ± 1 %
n-Octane 0.0005 to 0.05 ± 0.5 % to ± 1 % 0.0005 to 0.05 ± 0.5 % to ± 1 %
n-Nonane 0.0001 to 0.02 ± 0.5 % to ± 1 % 0.0005 to 0.02 ± 0.5 % to ± 1 %
n-Decane 0.0001 to 0.005 ± 0.5 % to ± 1 % 0.0005 to 0.005 ± 0.5 % to ± 1 %
C6+ N/A 0.001 to 0.35
Helium 0.005 to 0.2 ± 0.5 % to ± 1 % 0.005 to 0.2 ± 0.5 % to ± 1 %
Hydrogen 0.005 to 0.2 ± 0.5 % to ± 1 % 0.005 to 0.2 ± 0.5 % to ± 1 %
oxygen/Argon N/A 5 ppm to 100 ppm  ± 1 % to ± 5 %

Physical properties such as calorific value, relative density, real density, Wobbe index, mean molecular mass and compression factor are calculated from composition according to ISO 6976, GPA 2172 or ASTM D3588.


Other Applications of Natural Gas Standards
  • Sulfides & Mercaptans in Natural Gas Composition
  • Liquified Natural Gas (LNG) Standards in Constant Pressure Piston Type Cylinder, as shown below

For Cylinder Pressure Regulators, click here