Fire Alarm systems are a worthwhile investment in the protection of your home and family. Fire alarm work is carried out in accordance with BS 5839 along with any recommendations made by the local Fire Officer, and we take into consideration both these factors when dealing with Installation and Testing of Fire Alarm systems. As an example, one of the recommendations is that your Fire Alarm system should have a “full” annual test of all elements (heat/smoke sensors, break glass, sirens), followed by a quarterly functional test of a percentage of the elements. At SEIL we can test and certify your Fire Alarm system to meet the above requirements. Fire Alarm is an excellent way to stay away from the harness of the fire. Now a day’s fire alarm has become a part and parcel of every building due to its ability to prevent causalities caused by fire. Another reason of fire alarm’s popularity is its cost. You can have one just for $10. Lets examine how this great security tool works. Actually every fire alarm is composition of two main elements i.e. a smoke sensor and a siren. The smoke sensor has the ability to sense the smoke and trigger the siren to alert people. The sensor is connected with a 9 volt battery or with 120 volts house current. There are two main types of smoke detectors. There are photoelectric detectors and ionization detectors. Photoelectric detectors works on a very simple rule. A light beam is thrown from one end and on the other end there is a light sensor. If there is some hurdle between the light beam and light sensor, it will trigger the alarm. There are two main disadvantages of this type of sensor. Firstly such sensors are large in size. Secondly, these sensors are not very sensitive. These sensors require a lot of thick smoke to switch on the alarm. The Ionization detectors are mostly used in fire alarm systems because it is more inexpensive and more sensitive. There is a small ionization chamber in fire alarm which contains almost 1/5000th of a gram of americium-241 which is a radioactive element. When there is a small amount of smoke near the fire alarm, the ionization chamber senses it due to radioactive process.