Why are fire alarms?
These instruments are used in order to inform people about an emergency, especially those who are directly at risk. They can be activated manually or after receiving an alarm notification from smoke detectors, fire, gas, radiation, temperature and others. Parallel with it runs the local equipment for fire fighting.
What are the detectors?
They are divided into three types, namely devices using audio, visual alert, and mixed. The first used the longest, they added the use of visible signals only in the 1970s. The price of mixed devices are not much different from the highly specialized. Here are the most common types:
● strobe notifiers
With the help of quick flashes of bright light or pulsed signal (usually red) draw attention to the threat. Mounted indoors.
● Fire Up
It emits a continuous sharp sound or a siren, effective at a greater distance than the devices, visual impact on the people. At the moment almost pushed out of the use of the following two variations Alerting devices.
● Siren / svetosignalschik
Publish both light and sound signals, making them more functional. The most common type among modern fire detectors.
● Speaker / device notification light
Different from the previous type of opportunity not only to give an audible notification, and broadcast voice messages or play previously recorded. These records are coordinating the actions of people in the evacuation, and may vary depending on the areas in which there is a specific instrument. Widely used in high-rise buildings, where it is important to most quickly and safely, and most importantly to systematize and bring people from each floor properly. They can also help, if necessary, give additional instructions to rescue groups or people who for whatever reason do not have time to get out of a burning building. These fire alarms collect the largest number of appreciative feedback and ensure maximum security.
For each of them there are special requirements for the installation, which should be available before you buy such a device.