The NOx sensor is a device used to measure and monitor nitrogen oxide (NOx) emissions in vehicles or industrial facilities. NOx is a harmful gas to the environment and human health, so effective control and reduction are necessary. These sensors are typically applied in the exhaust systems of vehicles or chimneys in industrial facilities to ensure emission levels comply with relevant environmental standards.

The primary function of NOx sensors is to measure the concentration of NOx in the exhaust and provide relevant data feedback to the control system of vehicles or industrial facilities. This real-time monitoring helps ensure that facilities or vehicles can comply with environmental regulations while minimizing adverse impacts on the environment.

The types and working principles of NOx sensors may vary depending on the manufacturer and application. In vehicles, NOx sensors are often associated with the vehicle's exhaust aftertreatment system, such as the Selective Catalytic Reduction (SCR) system, to help optimize the treatment and degradation of nitrogen oxides.

In summary, NOx sensors play a crucial role in today's automotive and industrial applications, contributing to emission control and reducing environmental impact