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Many NOx sensors work by first removing oxygen and then breaking down the nitrogen oxides to provide a reading. However, the NexTech sensor eliminates the need to remove oxygen; the sensor material is engineered to have a strong NOx sensitivity even in the presence of oxygen.
Most NOx emissions are derived from nitrogen in the fuels used or from nitrogen in the combustion air (thermal NOx). For natural gas-fired and No. 2 oil-fired boilers, thermal NOx represents the majority of NOx produced from industrial boilers.