A multisensor system for monitoring the quality of carbon dioxide in the beverage industry

In this work, we report for the first time that a system based on metal oxide resistive gas sensors can successfully determine the presence of trace-level pollutants in a carbon dioxide stream. The successful use of metal oxide sensors in the absence of oxygen (oxygen concentration below 15 ppm) has enabled a new type of analyzer to assess the quality of carbon dioxide, offering continuous monitoring capabilities, ruggedness, simplicity, wireless communications and low cost.