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.

Tunnel Sensors - A network
of local distributors worldwide

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.

Tunnel Sensors instruments are installed in more than 30 countries wordwide 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.

Tunnel Lighting – Preventing Black Hole Syndrome

The transition between day and night along with changes in weather conditions  present a challenge for tunnel operators to ensure lighting in road traffic tunnels remain at safe levels for motorists at all times. The lighting control at the tunnel portals is particularly important to ensure drivers do not suffer from “black hole syndrome” whereby…

Tunnel Sensors COVID-19 Update

Dear Customers and Partners, Due to the exceptional situation we all face, I would like to offer some reassurance that Dynoptic Systems and Tunnel Sensors are taking the necessary measures to keep our team safe while we continue to serve our customers. We have business continuity plans in place to ensure our key operations continue…

Tunnel Sensors – Communication and Control systems

Road traffic tunnels are inhospitable places, when traffic is flowing they are dangerous environments for anyone working in the tunnel bore. With tunnel atmosphere monitors installed high up on the tunnel wall access to the systems is nearly always restricted to planned closures. All Tunnel Sensors monitors have a comprehensive range of output and communication…
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