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Electronic Sirens The need to warn people of threatening danger is probably as old as mankind itself. Even in ancient days, man used a sophisticated system of watch towers, which were arranged to be all within sight of each other. Using light signals, people were able to transmit messages via the towers, all over the country within a remarkably short time. From medieval times until the 20th century, church bells were used to warn people. With the discovery of electricity at the turn of the century, it was possible to construct electric sirens. A disc with a number of holes was driven by an electric motor which propagated a whining air signal that could be heard at great distance. A major disadvantage of these motor sirens was their mains power requirement. Since the end of the Cold War, military threats have been subdued. However, other dangers which threaten human life and constitute ‚civil‘ dangers have redefined and renewed the development of Public Warning Systems. Such dangers are: ➣ fires ➣ storms, blizzards, monsoons, hurricanes, tornados ➣ tsunami and tidal waves ➣ floods and flashfloods ➣ earthquakes, volcanic eruptions ➣ avalanches, mudslides ➣ industrial hazards (chemical spillage or nuclear leakage, etc.) ➣ atmospheric hazards (ozone levels, smog, etc.) The sound of a siren just warns people of a threatening danger, but it does not reveal the types of danger, therefore, modern sirens must be able to generate numerous different types of alarms, as well as, to provide the possibility of PA (public announcement), or even “Live“ PA as an enhanced feature. These requirements led to the development of electronic sirens. The electronic siren has the following advantages over electro-mechanical sirens: ➣ high sound pressure (103dB(A) up to 124dB(A)/30 m and more) ➣ different signal capability (on board) ➣ public announcements over the siren‘s loudspeaker ➣ high availability due to extensive remote monitoring of all components as well as modern communication devices which are easily integrated for remote control and monitoring ➣ developed to sustain harshest climate and environment conditions, rigid and modular construction ➣ lowest power consumption, cost efficient, requiring minimal service ➣ configurable for omni-directional and directional sound propagation ➣ battery operated, thus independent from mains power supply in emergency conditions ➣ activation of customer specific alarms, pre-recorded text messages and live PA announcements. Communication between Control Centre and Electronic Sirens can be realized via: ➣ VHF/UHF radio ➣ Leased line/PSTN ➣ GSM network/SMS ➣ TETRA and with advanced methods like ➣ Fibre optic/ark fibre ➣ TCP /IP ➣ Closed VPN network ➣ Satellite A modern warning system consists of a warning center (usually a workstation or PC), and depending on the configuration, a network of relay stations, and of course, the sirens. Mercanta supplies, installs, commissions and services state of the art Electronic Siren Systems in accordance with conformity regulative and therein mentioned standards. These systems will be designed to suit local demands. The photographs depicted on these pages are intended to give a general notion about the modularity in products and subsystems. Please contact our sales staff for obtaining detailed technical information and a comprehensive quotation geared to your specific requirements. The Electronic Siren System ECN consists basically of various options of siren heads, depending on their required output power and a siren control centre. Siren Control Centre Consisting of: ➣ main control equipment (MCE) ➣ embedded PC ➣ real time operating system ➣ full backup radio equipment ➣ alert interface ➣ operation desk ➣ control panel (CP) ➣ keyboard ➣ LCD graphic display with backlight ➣ numeric keypad ➣ 4 cursor keys ➣ 10 function keys ➣ 2 status LEDs ➣ key switch controller (KSC) ➣ microphone ➣ key-lock switch ➣ PTT switch Considered the high end siren control centre, it is redundant in equipment level (main and backup PC) and in two independent communication networks (line and radio). 248

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