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Engine NOx Sensor

Car NOx Sensor

Nitrogen Oxide NOx Sensor

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Urea Doser Pump

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Company news about Are PM sensor and NOx sensor the same?

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Are PM sensor and NOx sensor the same?

2026-07-07

PM sensors and NOx sensors are distinct types of sensors; they differ significantly in terms of the substances they detect, their operating principles, and their application scenarios.

Different detection targets
PM sensors are designed to measure the concentration of particulate matter (PM)—such as soot particles like PM2.5 and PM10—in exhaust gas or ambient air.
NOx sensors are designed to measure the concentration of nitrogen oxides (NOx gases, such as NO and NO₂) in exhaust gas.
Different operating principles
PM sensors often utilize the laser scattering method, calculating particle concentration based on the intensity of scattered light; in automotive applications, they may also measure electrical conductivity following high-temperature regeneration to determine soot content.
NOx sensors operate on electrochemical principles, using zirconia solid electrolyte materials that react with nitrogen oxides at high temperatures to generate an electrical signal proportional to the concentration, which is then sent to the ECU for processing.
Different installation locations in vehicles
PM sensors are typically installed at the outlet of the DPF (Diesel Particulate Filter) to monitor emissions after particulate filtration.
NOx sensors are generally positioned at the inlet and outlet of the SCR (Selective Catalytic Reduction) system to regulate urea injection and monitor catalytic conversion efficiency.
These are two distinct types of core sensors within modern automotive emission control systems; while they may look similar, their functions are not interchangeable.

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Company news about-Are PM sensor and NOx sensor the same?

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Are PM sensor and NOx sensor the same?

2026-07-07

PM sensors and NOx sensors are distinct types of sensors; they differ significantly in terms of the substances they detect, their operating principles, and their application scenarios.

Different detection targets
PM sensors are designed to measure the concentration of particulate matter (PM)—such as soot particles like PM2.5 and PM10—in exhaust gas or ambient air.
NOx sensors are designed to measure the concentration of nitrogen oxides (NOx gases, such as NO and NO₂) in exhaust gas.
Different operating principles
PM sensors often utilize the laser scattering method, calculating particle concentration based on the intensity of scattered light; in automotive applications, they may also measure electrical conductivity following high-temperature regeneration to determine soot content.
NOx sensors operate on electrochemical principles, using zirconia solid electrolyte materials that react with nitrogen oxides at high temperatures to generate an electrical signal proportional to the concentration, which is then sent to the ECU for processing.
Different installation locations in vehicles
PM sensors are typically installed at the outlet of the DPF (Diesel Particulate Filter) to monitor emissions after particulate filtration.
NOx sensors are generally positioned at the inlet and outlet of the SCR (Selective Catalytic Reduction) system to regulate urea injection and monitor catalytic conversion efficiency.
These are two distinct types of core sensors within modern automotive emission control systems; while they may look similar, their functions are not interchangeable.

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