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Anemometers
UFM20 – Ultrasonic Anemometer TX+RX
Ultrasonic air flow meter made of 2 poweful transducers to be installed on opposite sides of the tunnel. It measures average air speed and direction in tunnel section with a good precision. In fact it is installed usually with a 45 dregees angle on a path of around 20-25m. So the measure is the average of air flow in that tunnel section.
UFM20 is useful to measure the natural air flow of the tunnel and to adjust this air flow with ventilation control in case of need (opacity or gas level over a limit).
UFM5 – Ultrasonic Anemometer point type transducer
Ultrasonic air flow meter made a point type transducer to be installed on the surface of the tunnel. It measures average air speed and direction in the tunnel section. Of course it is less precise than tx+rx type (UFM20) as it only measures flow in that point.
So the measure is the average UFM5 is easier to install, cheaper and it is also useful to measure the natural air flow of the tunnel and to adjust this air flow with ventilation control in case of need (opacity or gas level over a limit).