Flow measurement instruments

The tunnel flow velocity measuring device for long-term operation

Your Benefits

  • Representative measurement across total tunnel width
  • Very reliable measurement, compared with punctual measurement methods
  • Accurate measurement even of very low flow velocities
  • Long maintenance intervals of up to 5 years
  • Low operating costs due to reliable operation and low maintenance
  • High availability of devices and, therefore, of measurement data also

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.
In accordance with Article 2 (4), this product does not fall within the scope of RoHS directive 2011/65/EU and is also not designed for use in products which fall within the scope of this directive. You can find additional information in the product information.


The tunnel flow velocity measuring device for long-term operation

The FLOWSIC200 is used for the contact-free and accurate measurement of flow velocity and flow direction inside tunnels or exhaust ventilation ducts. Ultrasonic technology provides the cross-sectional mean average value of the flow velocity. This device is used for measurement necessary for optimal ventilation control and reducing running costs to a minimum when air flow is dictated by climatic conditions or by traffic.

In case of fires in tunnels the accurate, reliable and representative measurement of air velocity and direction across the tunnel is mandatory. This is the only way to check reliably the smoke propagation and to achieve the necessary information for optimal control of the ventilation system.

At a glance
  • Very large measuring distances possible
  • Non-contact measurement
  • Extremely rugged components made of titanium, stainless steel, or die cast
  • Versions for very corrosive tunnel atmospheres
  • Determination of flow direction
  • No mechanical moving parts



Technical overview

  • Technical data overview

    Technical data overview

    Measurement principleUltrasonic transit time difference measurement

    RABT 2006

    ASTRA "Guideline - Ventilation of Road Tunnels" (2008)

    RVS 09.02.22

    Enclosure rating

    Sender/receiver units: IP66

    MCU control unit: IP65

    FunctionConnection to SOPAS ET software
    Serial✔ , ✔
    Type of fieldbus integrationRS-232
    FunctionConnection to SOPAS ET software
    Internal system bus
    Type of fieldbus integrationRTU RS-485
    Diagnostics functionsInternal zero and reference point check
All technical data can be found accompanying the individual product