Which toxic Gases are you monitoring?

Tunnel Sensors is a leading specialist in the design and manufacture of advanced technology instrumentation for tunnel atmosphere monitoring.

Our mission is to provide systems that enable operators to run their tunnels at financially efficient levels whilst protecting tunnel users from the irritating and dangerous effects of traffic pollution.

We offer a complete range of tunnel atmosphere monitoring sensors, designed for measuring visibility and dust, CO, NO, NO2, air speed & direction as well as tunnel luminance and illuminance.

All Tunnel Sensors products are designed, assembled and tested at our premises in Oxfordshire, UK. With in-house product assembly, software design and R&D capabilities, the team has responsibility for all activities from design conception through to the final product. 

As a company with a firm foundation in electronic engineering, we have a flair for research and a track record of turning that research into powerful, marketable products. In this way we always retain the option to offer customised solutions to meet any specific customer requirements.

Furthermore, as an ISO9001:2015 accredited company our quality management system is continuously assessed for all elements of manufacture, supply, service.

In 2019 Tunnel Sensors and parent company Dynoptic Systems Ltd became part of the ACOEM Group. With Headquarters in France, ACOEM are a global leader in envrionmental monitoring helping companies and public authorities control and reduce their impact on the envrionment. 

ACOEM’s products and services enable customers to prevent noise and vibration pollution, improve air quality and increase the productivity and reliability of industrial machines. 

Tunnel Sensors offer...

Dedicated in-house software development team

Office based technical sales team who are available to assist directly with technical queries, system planning and general advice

Product development research facilities for customer specific projects and / or prototype instruments

A team of service engineers available worldwide to assist with installation, commissioning, calibration and routine maintenance and service calls

A network of distributors worldwide so sales visits and surveys can be carried out by local dealers who are fully trained to offer information and advice on our products

Ask a question

For further information on any of our products, please complete our contact form and a member of staff will respond as soon as possible.

Altenatively call us on +44 (0)1280 850521


Don’t just take our word for it, read what some of our clients are saying about our tunnel sensors.

our 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.
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