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Compressed gas proportioners designed to mix compressed nitrogen and oxygen to achieve oxygen concentrations in a composition close to the atmospheric values (i.e., about 21 percent of oxygen and 79 percent nitrogen) and deliver large volumes of the blend through a central supply system. The proportioners typically receive nitrogen and oxygen from large liquefied gas containers after evaporation of the gases. The mixed gas (known as synthetic air) may be passed through a humidifier and delivered through the central gas pipeline at high flows (e.g., up to 250 cubic meter/hour or more). Nitrogen-oxygen proportioners are equipped with flowmeters, a pressure-regulating mechanism, gas analyzers, and connectors to the primary gas sources and also for the delivery of the blended gas.
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