Ultrasonic air flow-meter
TunnelCraft 3 Codel International

The Air Flow Monitor (AFM) uses ultrasonic technology to measure air velocity. A single transmitter and an array of four receivers are contained in the measuring head. Air velocity and direction are calculated from measurements of the phase shifts from the ultrasonic signals at the receivers. The sensor is compact, contains no moving components, requires no routine maintenance and is unaffected by interruptions from passing vehicles and acoustic reflections within the tunnel. The Air Flow Monitor is designed as a stand-alone sensor.
Designed exclusively for tunnel applications the CODEL AFM is used in over 350 road and rail tunnels worldwide.

› Ultrasonic measurement technology

› No moving parts

› Designed to withstand the harshest tunnel environments

› Maintenance free operation

› High accuracy and performance

› Current and relay outputs direct from sensor