Early and reliable fire detection in tunnels

  • At a glance
    • Visibility (K value) measured according to the scattered light measurement principle
    • Highly available – no moving parts
    • Quick and reliable smoke detection
    • Software developed in accordance with EN 61508 (SIL1)
    • Low faulty alarm rate
    • IP 6K9K enclosure rating thanks to a rugged stainless-steel housing
    • Fog evaporation through integrated heating element (optional)
    Your Benefits
    • Perfect addition to temperature cables thanks to earlier and faster detection
    • High levels of reliability and operational safety
    • No need for protective measures during tunnel cleaning
    • Immune to gantry fog
    • Flexible connection options, easy to extend and integrate into existing networks
    • K value can be easily verified with a checking tool
    • Low level of effort due to simple mounting and quick commissioning
    • Alarm signal with adjustable limit value
    Early and reliable fire detection in tunnels

    The VISIC50SF smoke detector offers high-speed measurement to ensure fast and reliable smoke detection when tunnel fires occur. The VISIC50SF is very easy to mount, operate, and maintain. There is no need for alignment or parameter setting – measuring starts right away. With its IP6K9K enclosure rating, not only is the VISIC50SF able to withstand the harsh ambient conditions inside the tunnel, but also tunnel washing operations without any problems. During the design phase, particular importance was placed on ensuring reliable operation and long maintenance intervals. That is why there are no moving parts. There is an optional version available with heating for fog evaporation. This allows the VISIC50SF to effortlessly meet your desired requirements, making it the perfect solution for the fast and reliable detection of fires.

  • 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.

    • VISIC50SF system
      Measured valuesVisibility (K-value)
      Measurement principlesScattered light forward
      Measuring ranges
      Visibility (K-value)0 ... 150 km⁻¹
      Temperature measurement (option)–30 ... +70 °C
      Response time (t90)
      ≤ 5 s
      Visibility (K-value)1 km⁻¹
      1 %: of measuring range full scale
      Ambient temperature
      –20 °C ... +55 °C
      Storage temperature
      Measuring device–30 °C ... +85 °C
      Ambient pressure
      860 hPa ... 1,080 hPa
      Ambient humidity
      10 % ... 100 %
      Relative humidity, non-condensing

      ASTRA "Guideline - Fire Detection in Road Tunnels" (2007)

      RABT 2006

      Electrical safetyCE
      Test functions

      Contamination monitoring of glass pane

      Drift and plausibility check

      Automatic self-test

      Functional monitoring of the optional heating


      Internal heating

      Terminal box

      TAD tunnel adapter device

      Temperature sensor

    • VISIC50SF sensor unit
      DescriptionAnalyzer unit of the measuring system
      Enclosure rating
      Analog outputs2 outputs:
      4 ... 20 mA, 500 Ω
      Electrically isolated, short-circuit proof. Outputs are preset for smoke detection and temperature.
      Digital outputs3 relay contacts:
      + 48 V, 0.5 A, 24 W
      Preset for failure, limit value and maintenance
      RemarkNot available when a TAD is used
      Type of fieldbus integrationRTU RS-485
      LC display, inside
      Status LEDs: “Operational”, “Maintenance required”, and “Fault”
      InputFunctional keys
      OperationVia LC-display and function keys
      Dimensions (W x H x D)
      266 mm x 159 mm x 117 mm
      For details see dimensional drawings
      2.8 kg
      MaterialStainless steel 1.4571
      MountingWall mount, vertical, wall inclination up to 45° or ceiling mount using an adapter
      Power supply
      Voltage18 ... 28 V DC
      Other voltages with optional terminal box or Tunnel Adapter Device TAD
      Current consumption≤ 1 A
      Power consumption

      Without heating: ≤ 5 W

      With heating: ≤ 20 W

    • TAD tunnel adapter device
      DescriptionRemote controll with integrated display and additional I/Os
      Enclosure rating
      Analog outputs4 outputs (option):
      4 ... 20 mA, 500 Ω
      Electrically isolated
      Digital outputs3 outputs (option):
      125 V AC, 0.6 A / 30 V DC, 2 A
      Digital inputs1 input (option):
      30 V DC
      Dimensions (W x H x D)
      210 mm x 347 mm x 129 mm
      For details see dimensional drawings
      5 kg
      MaterialStainless steel 1.4571
      Power supply
      Voltage88 ... 264 V AC
      Frequency47 ... 63 Hz
      Power consumption≤ 15 W
    • VISIC50SF terminal box
      DescriptionServes for connection of power supply, data and signal cabling provided by the customer
      Enclosure rating
      Dimensions (W x H x D)
      266 mm x 238 mm x 146 mm
      For details see dimensional drawings
      2.8 kg
      MaterialStainless steel 1.4571
      Power supply
      Voltage85 ... 264 V AC
      Frequency45 ... 65 Hz
      Current consumption≤ 0.1 A

    Technical drawings

    VISIC50SF sensor unit open with clipped-on front cover
    VISIC50SF sensor unit closed
    VISIC50SF terminal box
    TAD tunnel adapter device
    standard version
    version with terminal box
    version with Tunnel Adapter Device TAD

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