Fire harms human lives and property, damages the ecological environment. Fire prevention is a matter of concern to all humans. If it is possible to report a fire in time and quickly organize an emergency, the losses can be minimized. The alarm mechanism is made up of smoke sensors, can undertake the task, and promptly alarm the fire.
Smoke sensors are fitted with a semiconductor material that is particularly sensitive to haze gas, such as tin oxide, zinc oxide, etc., so they are also called odor-sensitive materials. When its concentration reaches a certain value in smog, the electronic value of an odor-sensitive material quickly drops. Once the haze dissipated, their resistance values returned to normal; taking advantage of this property of odor-sensitive materials, a smoke sensor has been invented.
The simple automatic fire alarm mechanism is created by connecting the power supply and the siren to the smoke sensor’s two ends, forming a closed electronic circuit. When there is no haze, the smoke sensor’s resistance value is relatively large, and the current flows through the siren. Once a fire occurs, the smoke is dense. The smoke sensor’s resistance value quickly decreases, the current flowing through the siren increases, promotes the siren to work, emits a howl, and performs an automatic fire alarm.
In places like restaurants, hotels, warehouses, shops, it is possible to arrange smoke sensors in the areas that need fire prevention. Through a computer network connection, focusing on one alarm device can have a central effect of control. Along with surveillance cameras, smoke sensors are an extremely useful device to avoid the unfortunate risks caused by fire to people.