Light scattering smoke detectors work based on Tindal effect (it is an effect of scattering of light when light beam passes through a colloid (a homogeneous (a substance that is consistent or uniform throughout its volume) mixture in which the dispersed particles do not settle out).Ī light source and a photocell are fixed in a darkened chamber where direct light doesn’t fall on the surface of photocell. The drop in the current flow is used to trigger the sounder and alarm circuit. In case of fire when smoke enters the chamber, the current flow between two electrodes reduced due to ionize air. The first chamber is used to compensate the changes in ambient temperature, pressure or humidity while, there are alpha particles (radioactive material) in second chamber which is used to ionize the passing air in the chamber where current flows between two electrodes. There are two chambers in a typical ionization smoke detector. Ionization Smoke detectors work based on lowering the current flow through the inside chamber due to ionization which leads to initiate the alarm. The main purpose of a fire alarm system is to protect the wealth, health and life of individual or society. in case of emergency, the sounders will operate to warn the people around to evocative via general or emergency exit. Different types of fire alarm system such as conventional, addressable, intelligent and smart wireless designs are used for the same purpose i.e.
#Honeywell plc wiring solution manual
Like a CPU (central processing unit) in a computer system, the fire alarm control panel is the brain of fire alarm system which sends a status indication and notification to the connected detectors and sounders in case of manual or automatic operation.įire alarm systems are wired in industrial factories, offices, public buildings and nowadays even in homes.
0 kommentar(er)
