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A factory must install a smoke detector to prevent fires, so that the employees have sufficient time to evacuate when the fire occurs.
There are two types of smoke detectors: ionized smoke detectors and photoelectric smoke detectors.
The ionic smoke detector is composed of two series chambers, field effect tubes and switch circuits containing Am241 radiation sources. Sensitivity is relatively better, it is more suitable for places where dense black smoke is easy to produce; but there is a small amount of radiation, and the dominant position has been replaced by photoelectric type.
Secondly, the photoelectric smoke detector is composed of a light source, a photoelectric element and an electronic switch. The light scattering principle is used to detect the smoke generated in the early stage of the fire, and an alarm signal is issued in time. According to different light sources, it can be divided into four types: general photoelectric type, laser photoelectric type, ultraviolet light photoelectric type and infrared light photoelectric type.
Smoke detector installation requirements:
1. It needs to be installed on the ceiling of the building (cannot be installed on the wall).
2. lt requires of a fire alarm per 120 square meters.
According to the relevant requirements of fire safety, it is generally required to install smoke detectors in the following areas:
1. The fire detector group and its alarm device shall be installed on both sides of the fire shutter on the evacuation channel, and manual control buttons shall be provided on both sides
2. Class C production plant, C-class warehouse, C, D-class warehouse.
3. A fire alarm should be installed when the diesel generator room is installed in a civil building.
