NationMaster - Encyclopedia: Oxygen analyzer

An electro-galvanic fuel cell is an electrical device used to measure the concentration of oxygen gas in scuba diving and medical equipment. Inspiration closed circuit diving rebreather A rebreather is a type of breathing set that provides a breathing gas containing oxygen and recycles exhaled gas. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless Atomic mass 15. ... SCUBA is an acronym for Self-Contained Underwater Breathing Apparatus. ... See drugs, medication, and pharmacology for substances that are used to treat patients. ...

A chemical reaction occurs in the fuel cell when the potassium hydroxide in the cell comes into contact with oxygen. This creates an electric current between the lead anode and the gold-plated cathode through a load resistance. The voltage produced is proportional to the concentration of oxygen present. A chemical reaction is a process that results in the interconversion of chemical substances [1]. The substance or substances initially involved in a chemical reaction are called reactants. ... A fuel cell is an electrochemical device similar to a battery, but differing from the latter in that it is designed for continuous replenishment of the reactants consumed; i. ... The chemical compound potassium hydroxide, (KOH) sometimes known as caustic potash, potassa, potash lye, and potassium hydrate, is a metallic base. ... Electric current is the flow of electric charge. ... General Name, Symbol, Number lead, Pb, 82 Chemical series poor metals Group, Period, Block 14, 6, p Appearance bluish white Atomic mass 207. ... Diagram of a zinc anode in a Daniells cell. ... General Name, Symbol, Number gold, Au, 79 Chemical series transition metals Group, Period, Block 11, 6, d Appearance metallic yellow Atomic mass 196. ... Diagram of a copper cathode in a Daniells cell. ... International danger high voltage symbol. ...

They are used in oxygen analysers in technical diving to display the proportion of oxygen in a nitrox or trimix breathing gas before a dive. They are also used in electronic, closed-circuit rebreathers to monitor the oxygen partial pressure during the dive. Technical diving is a form of SCUBA diving that exceeds the scope of recreational diving. ... Typical decal used on scuba cylinders containing Nitrox Nitrox is a breathing gas consisting of oxygen and nitrogen (similar to air), but with a higher proportion of oxygen than the normal 20. ... Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used during the deep phase of dives carried out using Technical diving techniques. ... Air is the most common and only natural breathing gas. ... Inspiration closed circuit diving rebreather A rebreather is a type of breathing set that provides a breathing gas containing oxygen and recycles exhaled gas. ... In a mixture of ideal gases, each gas has a partial pressure which is the pressure which the gas would have if it alone occupied the volume. ...

Electro-galvanic fuel cells have a limited lifetime which is reduced by exposure to high concentrations of oxygen. The reaction between oxygen and lead at the anode consumes lead, which eventually results in the cell to fail to sense high concentrations of oxygen. Typically, a cell used for diving applications will function correctly for 3 years if stored in a sealed bag of air but only for four months if stored in pure oxygen.

Categories: Chemistry stubs | Diving stubs | Fuel cells | Diving equipment | Sensors A fuel cell is an electrochemical device similar to a battery, but differing from the latter in that it is designed for continuous replenishment of the reactants consumed; i. ... Proton exchange membrane fuel cells, also known as polymer electrolyte membrane fuel cells (PEMFC), are a type of fuel cell being developed for transport applications as well as for stationary and portable applications. ... Direct-methanol fuel cells or DMFCs are a subcategory of Proton-exchange fuel cells where, the fuel, methanol is not reformed, but fed directly to the fuel cell. ... Definition DEFC uses Ethanol in the fuel cell instead of the toxic methanol. ... Direct Borohydride Fuel Cell or DBFCs are a subcategory of Proton-exchange fuel cells where the fuel is a solution of Sodium borohydride. ... Phosphoric acid fuel cells (PAFC) are a type of fuel cell that uses liquid phosphoric acid as an electrolyte. ... The Formic acid fuel cell is a type of fuel cell that uses formic acid as a fuel. ... Scheme of a molten-carbonate fuel cell Molten-carbonate fuel cells (MCFCs) are high-temperature fuel cells, in the range of 600ÂºC. They operate at the highest efficiencies of any type fuel cell, including solid oxide fuel cells, proton exchange membrane fuel cells and phosphoric acid fuel cell and... This new type of fuel cell is based on a ceramic electrolyte material that exhibits high protonic conductivity at elevated temperatures. ... A biological fuel cell is a device in which a chemical, typically glucose, is converted to electric power by means of bacteria on the anode side. ... Zinc-air batteries, also called zinc-air fuel cells are a non-rechargeable electro-chemical battery powered by the oxidation of zinc with oxygen from the air. ... A Flow Battery is a form of secondary battery in which the electrolytes are not confined to within the power cell its self. ... Diagram of an Alkaline Fuel Cell The alkaline fuel cell (AFC) is one of the most developed fuel cell technologies and is the cell that flew Man to the Moon. ... Blue energy is the energy retrieved from the difference in the salt concentration between seawater and river water with the use of osmosis or reverse electro dialysis (RED) with ion specific membranes. ... By nature, all fuel cells - which are devices meant to convert chemical energy into electrical energy - can also be operated backwards. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... A fuel cell powered vehicle from GM A hydrogen vehicle is an automobile which uses hydrogen as its primary source of power for locomotion. ...