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.

We are recruiting! – Regional Sales Engineer

Due to continued expansion and ambitious growth plans, Dynoptic Systems Ltd, incorporating Tunnel Sensors have created a new position for a Regional Sales Engineer to join our sales team based at our head office near Banbury in Oxfordshire. You will be responsible for developing business opportunities for Dynoptic Systems’ range of opacity, dust and particulate…

Tunnel Portal Photometers – choosing the right location

The Acoem LUMIOS-MkIII photometer is designed to measure the level of luminance created by natural light at road tunnel portals. The luminance data is supplied to the tunnel’s lighting control systems, these systems ensure the visual perception of drivers is maintained both day and night by adjusting the tunnel’s portal light levels. This creates a…

Road Tunnel Monitoring locations – what to consider?

As the equipment manufacturers, Tunnel Sensors’ technical sales team are often asked where our visibility, gas and airflow monitors should be installed inside a road traffic tunnel. Unfortunately this is a question we are unable to directly answer with any certainty. Accessibility, traffic clearance, beam direction, cable routes, communication system, jet fan locations and environmental…
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