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Some oxygen sensing instruments have the ability to give an alarm signal or close down the welding operation, when there is an unwanted rise in oxygen level. [17] Purging can continue until the oxygen level is low enough once more and welding can begin again. To avoid such situations, undesirable materials must be kept away from the weld zone.
Hypoxic air is to be considered clean air and not contaminated air when assessing oxygen depletion hazards. Information relating access to the protected areas i.e. oxygen-reduced atmosphere are illustrated: AI, Arbeitsinspektorat; SUVA, Schweizerische Unfallversicherungsanstalt; DGUV, Deutsche Gesetzliche Unfallversicherung;
The type of oxygen sensor used in most underwater diving applications is the electro-galvanic oxygen sensor, a type of fuel cell, which is sometimes called an oxygen analyser or ppO 2 meter. They are used to measure the oxygen concentration of breathing gas mixes such as nitrox and trimix . [ 9 ]
The system can be flushed with an inert gas to reduce the concentration of oxygen so that when the flammable gas is admitted, an ignitable mixture cannot form. In NFPA 56, [1] this is known as purge-into-service. In combustion engineering terms, the admission of inert gas dilutes the oxygen below the limiting oxygen concentration.
Plasma cleaning is the removal of impurities and contaminants from surfaces through the use of an energetic plasma or dielectric barrier discharge (DBD) plasma created from gaseous species. Gases such as argon and oxygen, as well as mixtures such as air and hydrogen/nitrogen are used. The plasma is created by using high frequency voltages ...
Absorber technology of this type may reduce the oxygen level in the surrounding atmosphere to below 0.01%. [2] [3] Complete oxidation of 1 g of iron can remove 300 cm 3 of oxygen in standard conditions. Though other technologies can remove more, iron is the most useful as it does not cause odor like sulfur compounds or passivate like aluminium ...
The limiting oxygen concentration (LOC), [1] also known as the minimum oxygen concentration (MOC), [2] is defined as the limiting concentration of oxygen below which combustion is not possible, independent of the concentration of fuel. It is expressed in units of volume percent of oxygen. The LOC varies with pressure and temperature.
Electro-galvanic fuel cell as used in a diving rebreather to measure the partial pressure of oxygen. Two oxygen cells as used by oxygen analysers for diving gas showing commonly used connectors. An electro-galvanic fuel cell is an electrochemical device which consumes a fuel to produce an electrical output by a chemical reaction.