Air flow velocity monitoring in road and rail tunnels is a key component of ventilation technology in tunnel systems. Measurement of the air flow is subject to strict requirements. The measuring technology used must reliably and accurately measure the flow in the tunnel cross section, even when there is varying traffic volume. In order to avoid traffic interruptions, maintenance work on the measuring device must be kept to a minimum.
Measuring conditions completely change in the event of a fire in the tunnel. A large amount of thick smoke can develop in a short time. The gas composition changes significantly. The temperature increases very quickly at the site of the fire. The overall thermodynamic situation leads to a considerable change in the flow dynamics at the fire source. The FLOWSIC200 also works reliably under these extreme conditions - transmission of the acoustic signal is ensured at all times due to the integrated automatic signal amplification.