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Environmental/gas system analyzers designed to measure and display the concentration of oxygen in a sample of gas. These analyzers are typically portable units based in one of several technologies, including the use of the paramagnetic properties of oxygen and in the creation of zirconia oxygen electrolytic cells. Oxygen environmental/gas system analyzers are used to determine oxygen concentrations in closed and/or open air conditions, frequently in contaminated atmospheres; they can usually measure in a range from 0% to 100%, but devices intended only for accurate measuring of very small concentrations of oxygen are also available.
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