NOx measurement

In many applications, however, it is essential to accurately calculate the NO_x value by measuring the effectively measured NO and NO₂ values in the exhaust gas. The following success factors are relevant for NO_x determination: Fast transport in the sample extraction system (with small diameter at maximum pump performance), prevention of condensate formation (including through PTFE probe tubing and the flue gas cooler), and additional drying of the gas through the flue gas cooler. With ecom flue gas analysis devices, NO_x measurements can be performed using the following measurement methods with varying levels of accuracy:

• Electrochemical Measurement (NO and NO₂ Gas Sensor)
• Chemical Luminescence (CLD) for NO measurement in combination with an NO₂ gas sensor (electrochemical measurement)
• Chemical Luminescence (CLD) in combination with a converter that converts NO₂ to NO, thereby making the nitrogen oxides (NO_x) completely measurable.
• Chemical Luminescence (CLD) for NO measurement in combination with Photoacoustic Spectroscopy (PAS) for NO₂ measurement