Showing posts with label Understanding. Show all posts
Showing posts with label Understanding. Show all posts

Tuesday, January 17, 2012

Understanding Effective Home Alarm Systems

!±8± Understanding Effective Home Alarm Systems

Home security can be greatly enhanced with effective home alarm systems. However, not everyone is aware of what the best features consist of. Here is a discussion on which features can provide maximum security and safety.

Sensing Movement

Protection from break-in by intruders should be as complete as possible. This is important, whether you are home or away. A really good feature to have is motion sensing. Your home will be armed with motion sensors in several areas of the house. If there are any movements, it will trigger a siren or buzzer of some kind. If you are signed up with a home security service, it will notify the service automatically.

Downside of Motion Sensing

There is the possibility of false alarms. This can happen if you have pets in the home. Motion sensors are effective, only when nobody is home, or unless everyone is asleep. If you forget and get up in the night, you may trigger the motion sensor program. Motion sensing is very secure, but it will depend on your situation.

Windows and Doors

Two of the most common ways to enter a home are the windows and doors. Some modern systems will trigger a siren if a window or door is opened. It will also work if someone breaks or shatters the window, to get in. This can give very good security if all doors and windows are monitored.

The Right Service

Alarm systems are only as good as the service that comes with them. The most secure system will contact a security service, which will contact local law enforcement. Look for a service that has experience and check into references. Research as much as you can, before you decide.

Other Features

It is also very important to have fire and carbon monoxide protection. These sensors can save many lives if they are used properly. If your security monitoring service does not provide them, make sure that you at least invest in smoke detectors. They should be battery operated, in case of a power loss or electrical fire. Carbon monoxide detectors are important if you have any gas appliances or anything that burns fuel. They will let you know when the air is unsafe to breathe, before it is too late. Battery operated CO3 detectors will be the most secure.

Some building and council authorities will insist on smoke alarms being connected to a mains power supply. The logic here is that although batteries may not fail in a power outage, the risk of the property owner or tenant not replacing a dead battery is greater than a mains powered smoke alarm not working during a power outage!

Summary

Effective home alarm systems may have motion control, but under specific circumstances. They must have break-in protection for all windows and doors. Your security is only as good as the service that backs it up, so make sure that they are dependable and reputable. Do not forget to invest in smoke and CO3 detectors, and battery operated devices are the most secure. They will protect you in case of power failure.


Understanding Effective Home Alarm Systems

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Saturday, December 10, 2011

Understanding Fire Suppression Systems

!±8± Understanding Fire Suppression Systems

Gaseous fire suppression refers to the use of inert gas and certain chemical agents to extinguish fire. It is also often termed as Clean Agent Fire Suppression. The use of this method in extinguishing fire is presided over by the NFPA Standard for Clean Agent Fire Extinguishing Systems.

The fire suppression system makes use of an agent, agent storage containers, fire detectors, agent release valves, fire detectors, dispersion nozzles and agent delivery piping. It also makes use of fire detection systems such as actuation signaling and wiring control panel. In few cases, the agent can also be delivered through a solid propellant gas generator that can give off chemically active gas or inert gas.

To be able to extinguish fire, there are four specific ways on how agents work on a fire suppression system. These methods combined are better known as the Fire Tetrahedron. Here are the four methods of extinguishing fire along with their representative agents.

1. Reduction/ isolation of fuel- in this step, no agents are used as primary source of fire control. 2. Reduction of heat

HFC-227ea (MH227, FM-200)

Novec 1230

HFC-125 (ECARO-25)

3. Reduction/ isolation of oxygen

CO2 carbon dioxide

Argonite / IG-55 (ProInert)

IG-541 Inergen

IG-100 (NN100)

4. Inhibition of chain reaction of components mentioned above

FE-13

FE-227

FE-25

MH227

FM-200

Halons

Halon 1301

Freon 13T1

NAF P-IV

NAF S-III

Triodide (Trifluoroiodomethane)

Application: Generally, there are 2 methods on how to apply an extinguishing agent. You can either do total flooding or local application.

Total flooding- systems that work on total flooding applies extinguishing agents to a 3-dimensional enclosed area. The agent is allowed to be concentrated to reach a certain volume percentage of the agent in air. When the specific volume is reached, it is already adequate to put off a fire. Such systems are operated automatically using detection controls. It can also be operated manually using a system actuator.

Local application- systems working in this type of method applies extinguishing agents directly to the fire using a 2-dimensional are or a 3-dimensional region that surrounds the object on fire.

The difference of these two methods is that total flooding does not have physical barriers that encloses a fire space while local application does. When using automatic extinguishing systems, the term local application does not mean that the fire suppression system is using wheeled machines or portable fire extinguishers.

Safety precautions

Suffocation

Carbon dioxide, which is one of the primary representative agents of a fire suppression system, can present a health risk when in an enclosed space. Suffocation is one of the primary effects of inhaling carbon dioxide. There are many incidents where people are killed by the release of carbon dioxide. To prevent suffocation, safety systems should be installed as soon as a warning alarm is turned on in case of fire. The warning should be either a loud siren or something visually seen so that people can be aware of the presence of carbon dioxide, especially in an enclosed area. Evacuation of the area should be implemented. Proper awareness of the effects of carbon dioxide and maintenance of fire extinguisher systems should also be taken care of to ensure safety. Barotrauma, the pressure that is caused by the release of extinguishing and inert agents, including IG-100, IG-55 and IG-55, can actually be enough to break windows, and even walls. It can also harm people and other properties. Proper precaution is advised.


Understanding Fire Suppression Systems

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