Oxygen Detection

Oxygen Detection


Oxygen is the element with atomic number 8, represented by the symbol O. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colourless, odourless, tasteless diatomic gas with the formula O2.
Oxygen is the third most abundant element in the universe by mass after hydrogen and helium and the most abundant element by mass in the Earth's crust. Diatomic oxygen gas constitutes 20.9% of the volume of air. All major classes of structural molecules in living organisms such as proteins, carbohydrates and fats contain oxygen.
Oxygen in the form of O2 is produced from water by cyanobacteria, algae and plants during photosynthesis. It is used in cellular respiration for all complex life. Oxygen is toxic to obligately anaerobic organisms, which were the dominant form of early life on Earth until O2 began to accumulate in the atmosphere 2.5 billion years ago.
Oxygen Characteristics
CAS No. 7782-44-7
Chemical formula O2
Vapour density 1.1 (air = 1)
Safe Work Australia ES TWA ---
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Flammable limits LEL ---
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Chemical/physical properties Oxygen at room temperature is a colourless, odourless and tasteless gas. It will liquefy at temperatures below -183 °C to form a light blue liquid. It is a very reactive oxidising agent, forming oxides with most other chemical elements (e.g. H2O, CO, CO2, Nitrogen oxides, Iron oxide (rust), etc.)
Hazardous properties

Oxygen is essential for most forms of life. Depletion of available oxygen due to its consumption or displacement in confined spaces and reduction in partial pressure at high altitudes can be debilitating and life-threatening (hypoxia).

If inhaled at higher concentrations, a condition called hyperoxia can occur, leading to pulmonary oedema, inflammation and even haemorrhage, all of which can prove to be fatal.

In oxygen enriched conditions (above 23% by volume), substances which do not normally burn, or normally burn slowly, can ignite, even spontaneously, at much lower temperatures than usual.

Contact with liquid oxygen used in cryogenic applications can lead to serious frostbite.

Oxygen forms 20.9% by volume of the earth’s atmosphere and although it is consumed in large quantities by respiration, combustion and oxidation, the atmospheric level of oxygen is kept remarkably constant. This is mainly due to its release as a by-product during the photosynthetic production of carbohydrates from carbon dioxide using sunlight by green plants.
Industrially, oxygen is used for oxy-welding; medically it used in anaesthesia and oxygen therapy. It is also used in specialised breathing apparatus for fire-fighting, diving and aviation applications. 
Detectors available Electrochemical (0–30% by volume)
Gas Detector Tube (2–24% by volume)
Suggested alarm levels Set to provide warning if levels fall outside the ‘safe’ range of 19.5 to 23.5 % by volume.