NOx Sensor is a part of the nitrogen and oxygen reduction after-treatment system for diesel vehicles with urea-based SCR systems. A sensor located upstream of the SCR catalyst directly measures the concentration of nitrogen and oxygen emitted by the engine, which helps determine the optimal urea injection.
The NOx sensor installed after the SCR catalyst are used to monitor catalyst performance. In order to comply with the increasingly stringent nitrogen and oxygen emissions regulations, there are high requirements for accurate nitrogen and oxygen sensor measurements.