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SEMA Gases

Methane (CH4) Calibration Gas

Methane is a chemical compound with the chemical formula CH4. It is a group-14 hydride and the simplest alkane, and is the main constituent of natural gas.

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Available sizes 34L, 58L, 110L
Certification tolerance +/- 2% or N/A
Production tolerance +/- 10% or +/- 5% or N/A
Stability 60 months

Methane is a chemical compound with the chemical formula CH4. It is a group-14 hydride and the simplest alkane, and is the main constituent of natural gas. The relative abundance of methane on Earth makes it an attractive fuel, although capturing and storing it poses challenges due to its gaseous state under normal conditions for temperature and pressure.

Naturally occurring methane is found both below ground and under the seafloor, and is formed by both geological and biological processes. The largest reservoir of methane is under the seafloor in the form of methane clathrates. When methane reaches the surface and the atmosphere, it is known as atmospheric methane. The Earth’s atmospheric methane concentration has increased by about 150% since 1750.

34L 58L 110L Cert. tol. Prod. tol. Stability
(months)
100 ppm Methane // Air Available Available Available +/- 2% +/- 10% 60
1000 ppm Methane // Air Available Available Available +/- 2% +/- 5% 60
0.44 % Methane // Air Available Available Available +/- 2% +/- 5% 60
0.5 % Methane // Air Available Available Available +/- 2% +/- 5% 60
0.88 % Methane // Air Available Available Available +/- 2% +/- 5% 60
1 % Methane // Air Available Available Available +/- 2% +/- 5% 60
1 % Methane // Nitrogen Available Available Available +/- 2% +/- 5% 60
1.25 % Methane // Air Available Available Available +/- 2% +/- 5% 60
1.5 % Methane // Air Available Available Available +/- 2% +/- 5% 60
1.8 % Methane // Air Available Available Available +/- 2% +/- 5% 60
2 % Methane // Air Available Available Available +/- 2% +/- 5% 60
2.2 % Methane // Air Available Available Available +/- 2% +/- 5% 60
2.5 % Methane // Air Available Available Available +/- 2% +/- 5% 60
2.5 % Methane // Nitrogen Available Available Available +/- 2% +/- 5% 60
3 % Methane // Nitrogen Available Available Available +/- 2% +/- 5% 60
5 % Methane // Nitrogen Available Available Available +/- 2% +/- 5% 60
8 % Methane // Nitrogen Available Available Available +/- 2% +/- 5% 60
10 % Methane // Nitrogen Available Available Available +/- 2% +/- 5% 60
20 % Methane // Nitrogen Available Available Available +/- 2% +/- 5% 60
50 % Methane // Nitrogen Available Available Available +/- 2% +/- 5% 60
50 % Methane // Carbon Dioxide
(pressure restricted 650 psig)
Available Available Available +/- 2% +/- 5% 60
60 % Methane // Carbon Dioxide
(pressure restricted 800 psig)
Available Available Available +/- 2% +/- 5% 60
100 % Methane (2.5) Available Available Available N/A N/A 60
SEMA Gases leaflet SEMA Gases leaflet_A4

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