Measurement of NO2 concentration

        Nitrogen dioxide (NO2) is used as an important benchmark for controlling the tunnel ventilation. The VICOTEC321 tunnel sensor continuously measures the exact NO2 concentration. The VICOTEC321 uses the DOAS process, allowing it to detect the smallest concentrations of NO2, e.g., in measuring ranges from 0 to 1 ppm. The VISIC100SF tunnel sensor also measures NO2. This sensor uses an electrochemical process. The lowest measuring range of the VISIC100SF is 0 to 5 ppm.

  • Very low detection limits for NO and NO2
  • Automatic function monitoring and self-adjustment
  • Very rugged design in stainless steel
  • Automatic beam alignment between sender/receiver unit and reflector


Making traffic routes more efficient, safer, and environmentally friendly