Oxygen (O2) | SEMA Gases

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Oxygen (O2)

Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O2. Diatomic oxygen gas constitutes 20.8% of the Earth’s atmosphere. As compounds including oxides, the element makes up almost half of the Earth’s crust.

Most of the mass of living organisms is oxygen as a component of water, the major constituent of lifeforms. Oxygen is continuously replenished in Earth’s atmosphere by photosynthesis, which uses the energy of sunlight to produce oxygen from water and carbon dioxide. Oxygen is too chemically reactive to remain a free element in air without being continuously replenished by the photosynthetic action of living organisms.

Common uses of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving.

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.

Oxygen Calibration Gases

34L 58L 110L Cert. tol. Prod. tol. Stability
(months)
100 ppm Oxygen // Nitrogen Unavailable Available Available +/- 2% +/- 10% 60
0.4 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
1 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
2 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
4 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
5 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
8 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
10 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
15 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
18 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
18.5 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
20.9 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60
23.5 % Oxygen // Nitrogen Available Available Available +/- 2% +/- 5% 60

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