Methane (CH4)
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.
SEMA Gases is a manufacturer of span gases in disposable cylinder cans from the Netherlands, established from the want to create a label which is applicable for all brands of gas detection equipment. The products of SEMA Gases are used for calibration of portable gas detection instruments and calibration of fixed gas detection systems. SEMA Gases produces single gases (flammable gases, oxygen, toxic gases) and gas mixtures (2, 3, 4 or 5 gas mixtures) in various cylinder size up to 110 ltr.
Methane Calibration Gases
| 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 |
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