Air flow measuring instrument D-FL 220T
temperaturerelative humidityultrasonic

air flow measuring instrument
air flow measuring instrument
air flow measuring instrument
air flow measuring instrument
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Measured value
temperature, relative humidity, air flow
air, for tunnels
Other characteristics
analog, in-line


Measuring system for continuous evaluation of flow velocity and flow direction in tunnels. Ultrasonic sensors for tunnel ventilation control system. Reliable measurement across the tunnel profile. Two identical sensors alternately transmit and receive ultrasonic pulses. The system evaluates the transition times dependant on direction and calculates flow speed. D-FL 220T requires extremely low maintenance. •stand-alone system, no control unit required •simple configuration •corrosion resistant against aggressive tunnel atmosphere •sensors can be replaced quickly, no tools, no re-alignment required •signal transmission – per 4-20mA analog signal and 2 relays – per RS 485 bus via MODBUS RTU protocol •minimized spare requirements •extremely low maintenance YOUR BENEFIT •Precise Air Speed and Volume flow Monitoring Ultrasonic technology allows precise measurement of the average air flow along the whole tunnel cross section •Easy system setup and autonomous Operation Measuring device does not require an additional operation unit. Measuring devices can be replaced quickly with no tools or re-alignment required •Long Lifetime and extremely low maintenance requirements No consumables and no moving parts stand for low maintenance costs and a long Lifetime •Robust Design for a wide range of environmental conditions High-quality, corrosion-free plastic housing and a wide ambient temperature range •Easy connection due to configurable interfaces


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