In Greek mythology, the Sirens were beautiful creatures who lured sailors toward them and, ultimately, to shipwreck with their captivating music. Weak sailors took the bait, but smart ones interpreted the sounds as a warning and continued on course.
In modern electronics equipment, sirens have a similar warning function, without the intrigue. Sirens, devices that provide sounds, are in wide use today to alert a whole postal code or an individual that it is time to take action. Sirens emit a loud, piercing sound instead of music to warn the hearer of impending danger from a tornado or a car break-in, or gently beep to remind him that it is time to take the rolls out of the oven or change fire alarm batteries. Ironically, in view of their mythical musical origins, the first siren was invented by John Robison in 1799 to power the tubes in an organ, but sirens are used on everything from emergency vehicles to personal electronics. They are available in a wide range of standard and custom sizes.
Warning Tones With A Modern Touch
Sirens are either mechanical or electronic. Modern mechanical or pneumatic sirens use two concentric slotted cylinders, one stationary and one that rotates. When air passes through the slots, it is periodically interrupted by solid areas of the cylinder, which creates a tone that is amplified with a horn. The sound waves emitted by a siren penetrate the surrounding area and then dissipate when they strike a porous surface, such as the ground. Mechanical sirens use a considerable amount of energy to operate.
Electronic sirens use amplifiers, oscillators, and modulators to produce variable, pre-programmed tones such as a beep, yelp, wail, hi-lo, and more. They use less energy, yet can do the job even in physically small applications such as instruments, watches, cell phones, alarms, scanners, and other personal electronics.
Specifications For Custom Sirens
When sourcing custom sirens for your industry, you might be concerned with specifications such as:
- Voltage range (12VDC, 24VDC,220VAC)
- Operating mode (Continuous, continuous/pulse, gong, siren, siren sweep, selectable tones)
- Features (Volume control, steel gong, pulse/second)
- Mounting type (Base, chassis, panel, surface)
- Termination (Screw, terminal block, wire leads)
- Ingress protection against liquids, solid objects, and mechanical impact
Sourcing Sirens For Any Application
ISL Products International, connected with an international network of manufacturers of precision-engineered electronic and electromechanical components and assemblies, can find standard or custom sirens you need to meet your every criteria.
Working with vendors who offer high quality products and on-time delivery, ISL can obtain prototype or production quantities to do the job. When you need audible warning devices such as custom sirens, contact us today for a quote or a consultation.