Optional accessories

Our range of tunnel monitors are supplemented with a variety of accessories designed to assist with installation, operation and maintenance and to ensure optimum performance and reliability.


Calibration checking

A range of of optical filters and reference gas cells to enable routine calibration checking of the TSL instruments.

TSCU Operator Interface

Operator interface compatible with the TSL range of instruments for local visual display of readings, fault warning or alarm conditions plus multiheading capabilities

Operational accessories

Additional items such as ready-made power /comms / output cables; PSU and termination units plus associated installation accessories such as mounting brackets, extension sight tubes and weather covers.

Power and communications

A range of advanced control units are available to provide in-tunnel communication, networking and power to Tunnel Sensors monitors   .

Download a brochure

For further information and technical specifications about any of our products, please download a product brochure.
Alternatively contact us via phone or email and a member of our team will be happy to help.

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.

View 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.
Scroll to Top