Ventilation in tunnels shall provide for adequate breathing air for drivers and maintenance staff in tunnels as well as for sufficient visibility in the tunnel atmosphere which is contaminated with exhaust and dust.
Also emission of pollutants to the environment shall be minimized and in case of fire it shall reduce the effect of heat and smoke.

DURAG produces service reduced sensors and analysers, which precisely and reliably transmit the data of tunnel atmosphere to the ventilation control system.
2004/54/EC “tunnel” guideline as well as the national specifications for installations in tunnels are included in the design of DURAG sensors.
Redundancy and system stability are essential. Therefore DURAG offers separated sensors. This allows the ventilation control system to effectively perform the mandatory plausibility checks of the sensor signals.
Separated sensors can be placed at the ideal mounting positions. The sensors are rugged and will withstand corrosive tunnel atmosphere as well as tunnel cleaning procedures.
The units can be mounted quickly. Maintenance is minimized and units can be exchanged in case of malfunction immediately.

The DURAG delivery program includes sensors and analysers for

• Visibility
• Air flow speed and direction
• CO-, NO-, NO2-Sensors