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An electro-galvanic fuel cell is an electrochemical device which consumes a fuel to produce an electrical output by a chemical reaction. One form of electro-galvanic fuel cell based on the oxidation of lead is commonly used to measure the concentration of oxygen gas in underwater diving and medical breathing gases.
Usually electro-galvanic oxygen sensors are used to measure the oxygen fraction. [ 6 ] [ 9 ] Helium analyzers also exist, although they are expensive at present, which allow the Trimix diver to find out the proportion of helium in the mix.
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 ]
Oxygen window – Physiological effect of oxygen metabolism on the total dissolved gas concentration in venous blood; Physiology of decompression – The physiological basis for decompression theory and practice; Decompression models: Bühlmann decompression algorithm – Mathematical model of tissue inert gas uptake and release with pressure ...
Helium content may also be determined on the basis of measuring the speed of sound in the analyzed gas mixture. [3] The speed of sound depends on the mixture of gases and the temperature of the mix; in the analysis of trimix the speed of sound can be described by a non-linear function of temperature, oxygen content and helium content, and thus the content of helium can be determined by ...
Rebreather diver with bailout and decompression cylinders. Scuba gas management is the aspect of scuba diving which includes the gas planning, blending, filling, analysing, marking, storage, and transportation of gas cylinders for a dive, the monitoring and switching of breathing gases during a dive, efficient and correct use of the gas, and the provision of emergency gas to another member of ...
Sensors are usually designed so that the gas supply is limited by diffusion, and thus the output from the sensor is linearly proportional to the gas concentration. This linear output is one of the advantages of electrochemical sensors over other sensor technologies (e.g. infrared), whose output must be linearized before they can be used.
An example of the world's first commercially available, single hose SCUBA unit designed and manufactured by Ted Eldred in 1952. Porpoise is a tradename for scuba developed by Ted Eldred in Australia and made there from the late 1940s onwards.