Due to rising global industrialization, the monitoring ofexhaust gas is increasingly important. The monitoring of nitrogen oxides (NOx) is particularly important due to its role in the formation of ground-level ozone and acid rain. The BÜNOx gas converter allows easy and cost effective detection of NOx components in the flue gas(NO andNO ). The temperature of the converter is adjustable at the front panel through an easy-to-handle micro-controller. Of course status output signals required for process control are accessible to the user.