Wednesday, January 11, 2012
Sunday, January 8, 2012
Four Reasons to Select a Wireless Door Alert Over a Wired One
As technology progresses people often wonder when to switch from old to new. This is just as true with doorbells as it is with anything else. If you are shopping for a doorbell, trying to figure out whether a wired or wireless door chime is better, then you should consider four major factors: cost, complexity, convenience and security. Once you understand how the technologies measure up in each category you will know why wireless is quickly overtaking older forms of door chimes.
When determining the cost of a door alert system you need to keep several things in mind: mainly, the device's cost; distance from the door; and number of entrances wired to a single unit. These factors determine your overall cost, and will tell you which technology is more efficient for you. The size and design of the building will determine most of these factors, so it is important to have some form of layout on hand when you do your research. Typically the larger the building the farther your door chime will have to be from the door to remain effective, which can leads to more wiring, and the more entrances you will have to have attached to a single unit. Although a wireless system will cost you more than a wired one, upon purchase, the fact that they have almost no installation costs means that they end up being far less expensive than their wired counterparts, especially as your requirements become more complex.
Complexity and convenience are interconnected on a deep level with most door chimes. As wired systems become more complex, connecting several doorbells to one chime, their convenience drops drastically because each one has to be customized to make a separate sound and cannot be changed without rewiring. On the other hand, wireless systems remain convenient even as they become more complex because you simply have to program them with different tones for each entrance. This makes them the better solution for anything but the most simple layouts.
Assessing whether a wired or wireless door chime provides more security is fairly complex. The way wired systems are designed it is very difficult to tamper with them, and many can work even when there is no electricity. Wireless systems, on the other hand, operate using radio waves which means that anyone who knows the frequency of the receiver can hijack the signal and turn it into a continual nuisance. However, due to how portable and versatile wireless systems are they remain the better option for security. This is because they can incorporate other technologies into them, such as intercoms and video surveillance, to allow you to identify anyone at your location before you have to open the door.
Thus, choosing a wireless system over a wired one makes sense on all fronts. The main thing you need to keep in mind when choosing a system is how you intend on using it for your security. It will only be useful if you recognize its limitations and incorporate other forms of door alarms and surveillance into your layout.
Monday, January 2, 2012
Ionization Vs Photoelectric Smoke Alarms
Smoke detectors are one of the most important devices when it comes to fire safety in your home. They are the first thing that will alert you to a fire or smoke in your home, they can be the difference between life in death in a fire because every second counts and it is smoke detectors that can give you the early warning sign. No home should ever be without several smoke alarms,
There are two main types of smoke alarms available on the market today, namely ionization smoke detectors and photoelectric smoke detectors.
Ionization smoke alarms use a very small quantity of radioactive material to ionize air in an ionization chamber. This chamber becomes conductive allowing current to flow between two charged electrodes. When products of combustion enter the chamber such as smoke particles, the conductivity of the air in the chamber is lowered. When the conductivity of the air is lowered to a predetermined level, the alarm will go off.
Photoelectric smoke alarms consist of an LED (light emitting diode) and a light sensitive sensor in a sensing chamber. If products of combustion, like smoke particles are found in the chamber they will cause the light to scatter and stop the light from reaching the sensor, this in turn causes the alarm to sound.
As the two types operate on two different sets of principles, they may respond differently to various conditions
Ionization alarms are better suited for rooms that contain highly combustible items that will create flaming fires. These items would include flammable liquids or newspapers. Photoelectric devices would be better suited for bedrooms, living rooms and kitchens, as these rooms often contain large pieces of furniture, such as mattresses, armchairs or sofas which would burn more slowly and create smoldering smoke rather than hot flames.
Each of the types of alarms have been tested and certified by fire safety authorities to be used within the home and as each react slightly better to different types of fire it is probably best to have a selection of both types located around your home.
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