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 Sensors Webinar – 24th September 09:30 GMT+1

As global populations grow and road infrastructure becomes more congested, urban planners are increasingly turning to underground road tunnel networks to support smart city and regional expansion. Tunnels provide solutions for reducing journey times, connecting remote regions and even protecting users from climatic and environmental conditions. Existing tunnels often require significant refurbishment to install the…

In tunnel calibration made easy – no gas bottles required.

ACOEM Tunnel Sensors’ VICONOX range of tunnel atmosphere monitors have been designed with easy calibration in mind for both visibility and gas measurements. The systems have been developed to remove the requirement for toxic gas bottles and flow through cells to be taken into the tunnel. Tunnel operators are able to check (and if necessary…

Sydney’s new M8 motorway opens with ACOEM Tunnel Sensors installed

ACOEM Tunnel Sensors in partnership with ACOEM Ecotech in Australia have supplied a large network of Tunnel Sensors’ VICONOX and CROSSFLOW monitors in Sydney’s new WestConnex M8 motorway tunnels. The new 9-kilometre twin underground motorway tunnels run from the end of the M5 Motorway at Kingsgrove, to St Peters Interchange in Sydney’s South. The M8…
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