Worldwide, the main feature of ignition, which provides early detection is the smoke, because the vast majority at the first stage of a fire is smoldering material, accompanied by smoke, but only Subsequently, there are pockets of open flame, and hence heat. That's why smoke detectors are so popular. Kinds of smoke detectors: 1) Simple smoke detector. They send a signal to fire the device, which in turn turn, includes a siren. Determine if this is the room in which a fire occurred, it is often difficult. 2) Addressable smoke detector.
Their application allows you to accurately determine the location of fire at actuated sensor. 3) Analogue smoke detector. This smoke detector does not record the increase in the concentration of smoke, and acts as a meter. It produces the preliminary signals of a suspected fire situation before how the threshold is triggered sensor. The main parameters of the smoke detector are sensitivity, which depends on the ability of the smoke detector in time to detect the smoke and the possibility of a false signal. When lack of proper maintenance on the walls of the smoke chamber, a layer of dust, which can occur false alarm. On the dust, this is really an important issue in the flue sensors, we should say especially. Dust accumulation inside the smoke chamber leads to false positives, if the detector is in the draft – a process that occurs quickly enough.
If the room is not very dusty and there is strong air flow, this process slows down. In simple smoke detectors to track and monitor the accumulation of dust is practically impossible, therefore, in accordance with the rules of sensors have to disassemble and clean, which naturally requires material costs. Analogue addressable smoke detector offset dusting during operation, they are much more protected from false positives, allow in-service determine the level of dust. That is, one can predict when a particular detector needs cleaning. Analogue sensors can automatically predict the timing of maintenance, that is, the control device compensates for the slow change in the level of the signals it receives from each sensor, and taking into account the range of compensation and the time of operation, automatically calculates and displays the data on Display control panel projected date of service.