The 4992 NOx converter provides fast, accurate measurement of NOx (total oxides of nitrogen – NO plus NO2) in flue gases. The 190 rack-mounting instrument is designed for use with the xentra 4900 continuous emis-sions analyser to provide an exact record of the gas content of flue gas emissions.
Until now, determination of NOx levels has utilised a standard feature of the NO mea-surement module of the standard xentra 4900 emissions analyser which makes it possible for the NOx level in the flue gas to be calculated from the measured NO level by applying a known relationship between levels of NO and NO2. The Servomex 4992 NOx converter converts NO2 to NO in a quick-chilled extracted gas sample. The dry, conditioned and filtered sample of flue gas must have a dew point of less than 6 °C, be filtered to better than 1 µm and contain at least 0.5% oxygen, conditions provided reliably by sample conditioning systems of the same manufacturer. The stainless steel converter operates typically at 650 °C.
Servomex
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