Emissions analysers have to be checked annually by certified testers and during recent functionality tests for a Gasmet FTIR continuous emissions monitor (CEM) at a UK Energy from Waste plant, the Nitrogen Dioxide span check results were found to be incorrect. A subsequent investigation revealed surprising results that would not have been apparent had the plant been using traditional CEMs.
NO2 values should have been 76mg/m3 but the FTIR was reading 31mg/m3, so Dominic Duggan from Quantitech, the company which installed the monitor, was contacted to investigate.








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