Fire-alarm system is intended for discovering of ignition sources on the controlled object and efficient notification about the problem of the personnel and fire-fighting service. Fire-alarm system discovers ignition signs or smoke pollution signs on the territory of the object and transmits the signal to the control panel of the fire department. Usually fire-alarm system is constructed on the base of control device and the complex of fire detectors, registering ignition sources. Different hardware-software complexes can be used as a control device; fire detectors can be of specific, nonspecific mode and of selective-analog mode.
The type of fire detector predetermines the principle of operation and efficiency of fire-alarm system, though for different objects diverse variants of fire detectors could be the best variants. In nonspecific modes of fire-alarm systems the detectors have certain threshold of action, adjusted for certain parameter, thus, a number of detectors is input to the common line. If one of fire detector is actuated, the fire alarm signal is transmitted to the entire line of detectors. Specific system of fire-warning system differs from nonspecific by availability of certain address of each fire detector, in case of fire alarm actuation not only a fire signal is transmitted but information about ignition location as well.
Selective-analog fire-alarm system is the most advanced and efficient system, supplying the information not only about the fact of ignition, but a lot of supplementary data, enabling to organize fire fight more effectively. In selective-analog fire-alarm system the sensors transmitting fire-alarm signal and notifying the ignition location and its parameters as well are used. Additionally fire detectors in these systems are equipped by self-control system and the control panel receives the information about functionality, breakage or technical service necessity of the fire detectors. Aufbau principle of selective-analog fire-alarm system makes possible entire control of fire detectors and preference setting without switch off the system from the control board as well, thanks to that this system can be adjusted for changing conditions on the controlled object . Selective-analog fire-alarm system informs not only about the state of affairs on the object in certain period but fulfils analysis of parameters’ time history on the object; efficiency of this system is much higher than ordinary ones.
For today selective-analog fire alarm system is the most efficient, giving complete information about state of the controlled territory. The most effect from selective-analog fire alarm system can be gained on the large-area objects and few floors availability. Necessities of exactly selective-analog fire alarm system’s use on these objects is justified by reduction of possible losses in case of timely discovery of ignition source and prompt reaction of fire department.