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Use smoke alarms correctly to prevent 'unburned'

by:Rika Sensors     2021-12-05
Use smoke alarms correctly to prevent 'unburned'
In ordinary family houses, there are many places with potential safety hazards. After the fire broke out, the fire spread very quickly, far beyond ordinary people's imagination. It is unrealistic to rely solely on the fire brigade for rescue. The emphasis is on prevention and early warning.

First, let’s first understand the timeline of fire occurrence. The timeline of fire development refers to the incipient, growth, and flashover of a fire in a closed area. There are five stages from Fully Developed to Decay. The ordinate is the heat release rate, which can be simply understood as the size of the fire.

It can be seen from this picture that the flame has just started to burn, the power is low, and the spread speed is slow. Simple manpower can extinguish the fire. In fact, most fires are extinguished at this stage.

The time and hazard of each stage are also different, it may be 1 minute, it may be 10 minutes, it may be 1 hour. The size of the house, the size of the windows, the amount of combustible materials and fire-fighting facilities, etc., will all affect the speed of fire development.

Smoke alarms can provide the most effective and timely warning. Give you enough time to escape and even put out the fire! The design concept of the smoke alarm is to give people early warning of fire from the initial stage to the development stage.

About smoke alarms

Since the 1970s, the United States began to promote the installation of smoke alarms and enact relevant laws. Today, more than 96% of households in the United States have smoke alarms installed.

So, are these alarms really effective?

According to US statistics, from 1977 to 2018, the total number of fire deaths among American residents dropped from 6,015 in 1978 to 2,720 in 2017, a reduction of more than half in the 40 years. The installation of smoke alarms is the main reason for the drastic reduction in the number of fire deaths among residents.

At the same time, the National Fire Protection Association also made a statistical comparison of the number of residents who died from fires from 2012 to 2016. Among them, the average death toll per 1,000 fires in which smoke detectors are installed and functional is 5.7 people, while the average death toll is 12.3 for those without smoke detectors or smoke detectors that do not play a role. The data proves that it is necessary to install a smoke alarm.

Smouldering fire is an important issue in home fire protection. Smoldering refers to the slow, low-temperature burning of a thing, with only smoke but no fire. The photoelectric detection method has earlier sensitivity to 'smouldering fire'.

The smoke alarm is designed with the principle of photoelectric smoke sensing, and realizes fire prevention by monitoring the concentration of smoke. It has built-in smoke sensors and photoelectric smoke devices. The smoke moves upwards. When it rises to the bottom of the ceiling and enters the inside of the alarm, the smoke particles will scatter part of the light beam to the photosensitive element. The denser the smoke, the more light is scattered on the photosensitive element. When the light beam scattered on the sensor reaches a certain level, the buzzer will sound an alarm. At the same time, the sensor converts the light signal into an electric signal and transmits it to the automatic fire alarm system to prompt a fire.

The photoelectric smoke device is used, which has the characteristics of precise measurement, sensitive response and high stability; it complies with the fire protection GB4715-2005 standard, adopts ceiling-mounted installation, does not need to debug, and can detect fire 360°. Stable work, beautiful appearance, simple installation. It is widely used in shopping malls, hotels, shops, warehouses, computer rooms, residences and other places for fire safety monitoring.

The smoke alarm is not only an important part of the automatic fire alarm system, but also an important guarantee for people’s work and life. It can detect fires in time and emit a strong sound to remind the on-site personnel to quickly alarm and evacuate quickly. Minimize the reduction of casualties and economic losses.

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