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what is Nox sensor?

2025-10-14

A NOx sensor (Nitrogen Oxide sensor) is an electrochemical device used to measure the concentration of nitrogen oxides (NOx) in exhaust gases, primarily for automotive emission control systems‌ It typically consists of:

Core components

  • Two internal chambers: one for sample gas intake with a diffusion-limiting passage, and another with a NOx-reducing catalyst for atmosphere introduction‌
  • An electrochemical pumping cell to regulate oxygen partial pressure in the sample chamber‌1.
  • A sensor cell that outputs an electromotive force proportional to oxygen partial pressure, enabling NOx concentration calculation‌13.
  • Applications

    • Diesel engines‌: Used in pairs (upstream/downstream) for SCR (Selective Catalytic Reduction) systems to monitor NOx conversion efficiency (≥95% under China VI standards)‌24.
    • OBD compliance‌: Detects emissions for onboard diagnostics and urea injection control‌2.
  • Technical variants

    • Current-type sensors‌: Utilize multiple electrochemical cells to pump out O2 before NOx measurement‌3.
    • HTCC ceramic chips‌: integrate heaters and multilayer ceramic elements for precise NOx/O2 detection via current measurement‌4.
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      •  
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detalles de las noticias
En casa > Noticias >

Noticias de la compañía-what is Nox sensor?

what is Nox sensor?

2025-10-14

A NOx sensor (Nitrogen Oxide sensor) is an electrochemical device used to measure the concentration of nitrogen oxides (NOx) in exhaust gases, primarily for automotive emission control systems‌ It typically consists of:

Core components

  • Two internal chambers: one for sample gas intake with a diffusion-limiting passage, and another with a NOx-reducing catalyst for atmosphere introduction‌
  • An electrochemical pumping cell to regulate oxygen partial pressure in the sample chamber‌1.
  • A sensor cell that outputs an electromotive force proportional to oxygen partial pressure, enabling NOx concentration calculation‌13.
  • Applications

    • Diesel engines‌: Used in pairs (upstream/downstream) for SCR (Selective Catalytic Reduction) systems to monitor NOx conversion efficiency (≥95% under China VI standards)‌24.
    • OBD compliance‌: Detects emissions for onboard diagnostics and urea injection control‌2.
  • Technical variants

    • Current-type sensors‌: Utilize multiple electrochemical cells to pump out O2 before NOx measurement‌3.
    • HTCC ceramic chips‌: integrate heaters and multilayer ceramic elements for precise NOx/O2 detection via current measurement‌4.
    •  
      •