Tunnel Sensors

A global leader in the design and manufacture of speciality sensors for tunnel atmosphere monitoring.

Popular Tunnel Sensors

Below are our flagship tunnel sensor products, simply select them for more information



The VICONOX provides a total monitoring solution for the measurement of NO2, NO, CO, visibility and temperature within traffic tunnels.

Airflow MkII

Airflow MkII

The AIRFLOW MkII is a robust, single point monitor designed to measure air velocity (and temperature when specified) within a tunnel environment.



The CROSSFLOW provides an open path cross bore solution for measuring air velocity and direction in a tunnel.

Acoem Tunnel Sensors - A network
of local distributors worldwide

Acoem Tunnel Sensors is a global leader in the design and manufacture of speciality sensors for tunnel atmosphere monitoring. We design and manufacture our own analysers specifically for pollution monitoring in the traffic tunnel environment.

We bring fresh ideas and technology to a sector that has traditionally used systems adapted from exhaust stack and chimney monitors. Our analysers are designed to be combined in a modular fashion, offering the flexibility to create monitoring systems specifically adapted to the requirements of individual tunnels. Because tunnels throughout the world have diverse requirements for data presentation, our systems also offer a flexible output and communication system that allows seamless integration with any existing tunnel system or bus.

Acoem Tunnel Sensors instruments are installed in more than 30 countries worldwide with references in:

Asia | Europe | Middle East | Americas | Oceania | Africa

Latest news

Keep up to date with the latest product information and news from tunnel sensors.


From everyone here at Acoem Dynoptic and Tunnel Sensors, we wish you a Merry Christmas and a Happy, Healthy, and Prosperous New Year. Thank you to all our customers, suppliers and colleagues for your efforts and business during 2021. We hope to carry this success forward into 2022 and beyond. We will be closing for…

Power & Communication connections

The Acoem Tunnel Sensors VICONOX, CROSSFLOW and AIRFLOW-MkII road tunnel atmosphere monitors are all supplied with a set of cables for power, communication and outputs. These cables are designed to enable simple connection and interconnection to the monitors which brings a number of benefits during monitor installation and long term maintenance. Power and Communication cable…

Tunnel Monitoring – How do you manage fog?

Fog is a weather condition which most drivers have experienced. The result of fog is reduced visibility and an increased chance of road traffic accidents because drivers have less time to react. The emergence of fog is typically influenced by a nearby body of water, or from moist ground combined with the right topography and…
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