Emergency sirens are acoustic devices that generate loud sounds to alert the public of emergencies such as an oncoming tornado, the release of hazardous materials, or a possible explosion. These special sirens are essential in helping the public prepare themselves, escape, or take the necessary safety measures.
Pneumatic emergency sirens have rotating disks with holes called rotor or siren disks. The holes in the disks control the air flow to get a compressed or rarefied air pressure. Pneumatic emergency sirens consume a large amount of energy. They are called mechanical or coaster emergency sirens when used in vehicles.
Electronic emergency sirens
Electronic emergency sirens use modulators, amplifiers, and oscillators. They give off yelp, wail, pierce or priority, scan, hi-lo, and airhorn sounds through the external speakers. Electronic emergency sirens are ideal for clearing road traffic and directing vehicles turning or passing through intersections.
Built-in light: Choose an emergency siren with a built-in light to allow the people to see where the warning signal is coming from. A lighted emergency siren system can probably more easily convince people that an emergency is imminent than a siren that only generates sound.
