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Gas detection for tunnel
June 1st 2009

Over 500 Crowcon detectors have been chosen for installation throughout the 28km long Guadarrama Tunnel in Spain.

Carbon monoxide (CO), nitrous dioxide (NO2) and oxygen (O2) levels are measured by intrinsically safe Xgard detectors (validated to IEC61508 SIL2/3), while methane (CH4) levels are detected using Crowcon's flameproof (Exd) infrared Nimbus units. Signals from these detectors are processed by over 70 Vortex rackmounted controllers, which are connected to PLCs via RS485 and provide operators with all gas readings and alarm/fault information. If the detectors register dangerous levels of gases, ventilation and exhaust systems are automatically triggered by the Vortex control panels, which also pinpoint which detector is in alarm mode and immediately transmit this information via PLC to a SCADA system.

More articles from Crowcon Detection Instruments Ltd:

Gas detection for tunnel (1st February 2009)

Over 500 Crowcon detectors have

From Breathing safely