Oxygen (O2) constitutes 21% (by volume) and over 46% (by weight) of the earth's crust and is the most plentiful element.

It is obtained for industrial use by distillation of liquified air. Medical uses include respiratory therapy, incubators and inhaled anesthetics. Oxygen (O2) is part of all gas mixtures for spacecraft, scuba divers, workers in enclosed environments or hyperbaric chambers. 

Inert gases such as argon (Ar) and helium (He), as well as nitrogen (N), are not toxic, but they do not support human breathing and can displace oxygen (O2) in the air if there is a leak. These inert gases are odourless, colorless and tasteless making them undetectable. The only way to detect low oxygen (O2) concentrations is with real-time monitoring from the use of continuous oxygen (O2) depletion sensors.

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Analox provide the following oxygen (O2) gas monitoring solutions:

Fun Fact

Oxygen was discovered in 1772 by a Swedish chemist, Carl Wilhelm Scheele, who obtained it by heating potassium nitrate, mercuric oxide, and many other substances.