EWS System Design Criteria
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Warning and Notification Systems System Design Criteria The Edwards Difference Furthermore, the survey map does not consider the effect that the Since 1872 Edwards has been dedicated to producing the finest rotation has on the sound of the signal to the human ear. The effect of Signaling Equipment available. Edwards Warning Systems are shaped by continuous quality, perfomance, durability and reliability. Each siren is hand built in the United States by signaling professionals and then tested to exacting standards. We use only American made, industrial quality, continuous duty motors, for the ultimate in reliability. Edwards sirens are rated by the Nuclear Regulatory Commission at 53 years of WARNING AND NOTIFICATION SYSTEMS the sound rotating toward, and then away from any given point causes a "peaking" and "ebbing" of the sound - and a potentially dangerous problem. Imagine for a moment that your town uses a series of signals to warn its populace: one steady blast for a tornado, and a warbling tone for "all clear." Now consider what the rotating siren's "steady" tone will sound like with its peaking and ebbing effect. The result can be a very confused populace and a resulting disastrous situation. Edwards decoders are field programmable and field serviceable and Edwards Omni-Directional sirens project the same decibel level in all Edwards will work with your local service technicians to ensure any repairs are completed correctly. All siren parts are made from non-corrosive metals and are powder-coated to provide additional protection directions simultaneously. They provide 360 degrees of coverage and, if you use multiple sirens, there will not be the distortion that occurs with a rotating siren. form the elements. Sound projection from all but one of Edwards sirens is Omni-Directional resulting in full decibel output in all directions Custom Siren Survey At Edwards, we specialize in designing custom siren systems to best fit any given project. Our no charge, no obligation Siren Survey will take away the guesswork. Just call and we will connect you to a site It is a common misconception to directly compare the dB rating of a designer who will produce a scale, topographical map of your project, rotating siren with that of an Omni-Directional siren. Because the siren rotates, it spends much of its on-time facing away from any given point, where the dB level has dropped. When a siren survey is done for a given area, the siren's output is considered, and a circle is drawn complete with suggested siren placement, siren models, activation equipment, and estimated costs. Let us know what you want to do and Edwards will help make your project a reality. See Map 1 and Map 2 on the following page for examples of 2-D and 3-D project maps. on a map to estimate the area that the siren should cover. However, with a rotating beam type siren, the area is covered only 25% of the on-time by the maximum beam output, and 75% of the on-time by a lesser beam output. Therefore, the rotating beam siren presents its maximum output to your ear only 1/4 of the time. Omni-Directional Warning Siren 8 Horn, Equal Length, Single Row EWS-V3 and EWS-V10 Series

Siren Activation Systems 13 Examples Of Standard Siren Output Signals: A. Alert (Civil Defense), Steady blast for three minutes B. Attack (Civil Defense), Warbling signal for three minutes C. Fire Typically 15 sec. on, 15 sec. off; bursts for three minutes but is field programmable D. Cancel Stops all functions (all timing is adjustable) A B 4. CHOOSE ONE ONLY—A, B, OR C Land Line Activation (Used to Achieve Siren Timing Functions Without Radio Equipment) GEN-1 Multi-function Push Button controller Model EWS-SWM Start button (momentary) (operator controlled) Model EWS-SW Start/Stop...