Accutron Instruments ultrasonic sensors can be used for airflow measurement in road tunnels etc. Such tunnel sensors can be used in conjunction with ventilation control etc. Tunnels require ventilation to ensure an adequate air quality to control the spread of smoke in case of fire, or to reduce temperatures to acceptable limits.

Ultrasonic wind sensors (either point measurements or across the entire tunnel / road) are used to accurately monitor tunnel ventilation and ensure safe operating conditions. Vehicular tunnels (road, rail and metro) generally require high air quality during normal operation and smoke control in case of fire. High acoustic power for large tunnel diameters up to 35 m.

Read more about Accutron