Model 620 and 611 flame detectors are designed to detect the ulta-violet light emitted by an open flame within a confined public place. The robust, ultra-violet floor-mounted (611) and ceiling mounted (602 flame detectors are easily installed and maintenance is limited to periodic cleaning of the lenses – as little as once per year depending on the application. Extensively tested for vibration and the unique conditions of rolling stock, the instruments have been successfully operating inside the roll-on-roll-off passenger trains operated by Eurotunnel for over 15 years. - High accuracy and stability is maintained over long periods - Low maintenance - limited to cleaning of optics - Robust units fully sealed to IP68 - Low cabling requirements - Modular construction and simple installation - Certified for vibration, shock and electric & magnetic fields