high accuracy & stability maintained over long periodsdesigned to withstand the harshest environments modular construction ensures simple installation& low cable requirementsrugged units, fully sealed to IP68, designed forvery high availability with minimal maintenance requirements In confined public areas where the risk of fire isever-present, the need for adequate smoke detection is becoming increasingly important if unnecessary loss of life is to be avoided. Early warning of the presence of smoke allows the maximum possible time to instigate fire-fighting and evacuation procedures.The CODEL Model 121 measures the absorption of lighttransmitted across a fixed measurement distance, a priciple used in CODELs well-proven industrial opacity monitors. The Model 121 has been extensively tested to withstand the unique conditions associated with rolling stock and the high levels of vibration and shock likely to be encountered particularly when carriages are being shunted. These ceiling-mounted smoke detectors are easilyinstalled and maintenance is limited to periodic cleaning of the lenses - as little as once per year depending on the application.CODEL smoke detectors, together with UV flamedetectors (Models 602 and 611), have been in successful operation in the ґroll-on-roll-off trains operated by Eurotunnel for over 15 years. > Doc i/d : 090011 Issue : A Rev. : Date : 18/3/09ҩ 2009 CODEL International Ltd. We reserve the right to modify designs without prior notice. size="-1">