For the control of ventilation and for filter monitoring in road tunnels
  • At a glance
    • 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
    Your Benefits
    • Energy and cost savings for ventilation control due to very low zero offset and accurate measurement
    • Low operational costs because no air aspiration of ambient air and no test gases are required
    • Low maintenance requirements due to long maintenance interval (approx. 1 year)
    For the control of ventilation and for filter monitoring in road tunnels

    The VICOTEC320 measures very small concentrations of NO2 and NO as well as the visibility and temperature in road tunnels simultaneously and quickly. using industry-proven components – without test gases for zero and reference point. An automated, cyclic adjustment of zero and reference point ensures exact values. The rugged housing even withstands thorough tunnel washing operations without any problems.

    The VICOTEC320 can be optionally equipped with an electrochemical CO measurement cell. This is useful for performing the plausibility checks which some tunnel standards (e.g., German RABT2006) recommend – even when NO2 is used as lead gas component.

  • Please note: The exact device specifications and performance data of the product may deviate from the information provided here, and depend on the application in which the product is being used and the relevant customer specifications.

    • VICOTEC320 system
      Measured valuesVisibility (K-value), NO, NO2, CO, temperature
      Measurement principlesDifferential optical absorption spectroscopy (DOAS), transmittance measurement, electrochemical cell, Pt1000
      Length of measuring path

      10 m

      20 m

      Measuring ranges
      K-value0 ... 15 km⁻¹ / 0 ... 99 km⁻¹
      NO0 ... 20 ppm / 0 ... 45 ppm
      NO20 ... 1 ppm / 0 ... 5 ppm
      CO0 ... 100 ppm / 0 ... 300 ppm
      Temperature–25 ... +55 °C
      Response time (t90)5 s ... 360 s
      Visibility (K-value)± 0.8 km⁻¹
      NO, NO2± 5 %
      Of measuring range full scale
      CO± 10 ppm
      Temperature± +2 °C
      Ambient temperature

      –25 °C ... +55 °C

      CO sensor: –20 °C ... +40 °C

      Storage temperature

      –25 °C ... +75 °C

      CO sensor: –25 °C ... +55 °C

      Ambient pressure700 hPa ... 1,200 hPa
      Ambient humidity10 % ... 95 %
      Relative humidity, non-condensing
      Electrical safetyCE
      Enclosure ratingIP69K
      Analog outputs6 outputs:
      0 ... 20 mA
      Depending on device version
      Digital outputs4 relay contacts:
      Depending on device version
      Digital inputs4 potential-free contacts
      Ethernet TCP/IP
      FunctionConnection to SOPAS ET software or OPC server
      Dimensions (W x H x D)

      718 mm x 470 mm x 310 mm (sender/receiver unit)

      617 mm x 278 mm x 245 mm (reflector unit)

      450 mm x 254 mm x 148 mm (connection unit)


      Sender/receiver unit: 20 kg

      Reflector unit: 9 kg

      Connection unit: 8 kg

      MaterialStainless steel 1.4571, powder-coated
      Power supply

      VICOTEC322, –323, –324: 115 V / 230 V

      VICOTEC321: 85 ... 264 V


      VICOTEC322, –323, –324: 50 Hz / 60 Hz

      VICOTEC321: 47 ... 63 Hz

      Power consumption

      VICOTEC322, –323, –324: ≤ 200 W

      VICOTEC321: ≤ 100 W

      Test functions

      Automatic check cycle for zero and span point

      Contamination check

      Manual linearity check

      OptionsCO sensor

    Technical drawings

    VICOTEC320 connection unit
    VICOTEC320 reflector unit
    VICOTEC320 sender/receiver unit

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