Useful, do you say? They are life savers! Smoke detectors may stay there for years, high near the ceiling, unobtrusive and silent, almost invisible.
Should any of the events they are designed to sense, however, happen anytime when least expected, their immediate sounding the alarm is invaluable, irreplaceable, indispensable.
You may think that everybody can smell smoke and you need no gadgets to alert you of something so obvious. You should not make this mistake. It is not so easy.
First, smoke usually foretells a fire. A few minutes of advance notice may make all the difference between running to safety or succumbing to the flames, especially if children or elderly people are to be helped out. Better prepare an escape route.
A smolder or localized fire is easier to put out than a place bursting into flames, if one can catch it in time, with the help of a dependable early alarm and fire extinguishers.
Second, without an alarm, sleeping people may not wake up early enough to take action, either to extinguish the flames or to escape.
Third, the presence of carbon monoxide, a very dangerous and poisonous odorless gas produced by partial burning, cannot be smelled. It can be there even before smoke.
Other gases too, each one with its specific dangers, of suffocation if inert, or of explosion, if combustible, might invade a room from leaking piping or containers.
Modern technology developed along different principles, but the physics of the devices is not important. It would add a measure of security though to select a detector either endorsed by Firefighters or approved by Underwriters Laboratories.
Self contained, battery operated, easy to install and needing a check only once a month, with battery change once a year, Smoke Detectors are supplementary devices that upgrade the level of security of any home.
Some Smoke Detectors may include a totally hidden surveillance camera, but this is a different security measure that should be considered separately and need not be combined in the gas and smoke sensor to be effective.
It always pays to be alerted in time. Smoke and gas detectors are a kind of insurance you may wish to pay once, hoping you will never need it.
Elia Levi is a retired engineer.\r He built a website to assist with a step-by-step Guide to understand, design, select and set up, all by yourself the best and least expensive Surveillance System for your Home Security. Read more on the subject of this article at\r http://www.1st-diy-home-surveillance-guide.com/Smoke-detectors.html
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