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A clean room is an engineered space that maintains a really low concentration of airborne particulates. It is designed to keep the dust and
vaporized particles away from the products in it. Other than this, the temperature, relative humidity and pressure of the clean room are also
under control as requested. Clean rooms are widely applied in industries like electronic components, medicine, precision instrument manufacturing and science research.
Risk of Having Fire in Clean Room
Building a clean room often needs to use lots of combustible materials, which will increase the fire load. Like polystyrene, it can insulate the
air ducts, but it can also increase the possibility of catching fire. Once there is a fire, a large amount of combustible materials in the clean
room will make it hard to control.
Besides, the clean rooms that produce electronic components tend to use flammable and explosive liquids and gases as cleaning agents, and the
clean rooms that produce medicines tend to use combustible packaging materials, both of which can easily cause fires or even explosions.
Furthermore, some production equipment in the clean room requires high temperatures exceeding 800°C, this can also lead to fires.
And since the clean room needs to be actively cleansed, its air exchange rate can reach 600 times per hour, which provides sufficient oxygen for the fire to burn.
Disadvantages of Conventional Smoke Detection Systems
In order to keep the dust away, the clean room usually changes its air by sending it out from the upper part and receiving it from the lower
part, and its air inlet is often installed close to the ground. In the early stage of the fire, for the air purification system hasn’t stopped
working and the air inlet is still purifying the air, it is usually hard for the conventional smoke detection system installed on the ceiling to
detect the smoke, let alone to give the early alarm.
Therefore, in order to detect the smoke from the fire as early as possible, installing an aspirating smoke detection (ASD) system is the best
The aspirating smoke detection system is an important part of the clean room fire protection system. It has mainly two features:
1.Active smoke detection: The aspirating smoke detection system can actively collect the air samples through the sample ports of the sample pipes, and transmit them to the detector to detect smoke. This type of active detection has a high sensitivity, which is better than the conventional smoke detection system who detects smoke passively by waiting for it. The active detection of the aspirating smoke detection system ensures the clean room’s safety.
2.Early alarm: The aspirating smoke detection system can detect smoke at early times, and it can prevent a fire from actually happening. By doing so, the property in the clean room is protected. The aspirating smoke detection system also gives people enough time to respond to the fire and reduce the pollution and damage, which is really important for protecting people’s safety.
In addition, the design of the aspirating smoke detection system is rather adaptable, and it can be used as an automatic activating device for pre-action fire suppression systems.And for ASENWARE's aspirating smoke detection systems, other than the above features, they are also able to achieve the smoke content visualization, parameter customization, and historical alarm query functions, and they can be applied in different types of clean rooms.
Installation of Aspirating Smoke Detection System
For installation, the sample ports of the aspirating smoke detection system can be put at the air inlet of the clean room (Diagram 1, 2 and 3). The sample ports design of air inlet on vertical wall (Diagram 1)
The sample ports design of air inlet on the ceiling (Diagram 2)
The installation example of the sample ports of air inlet (Diagram 3)
But what needs to be noticed is that the processing equipment may affect the speed and direction of the airflow, so you can install the sample pipes in the mezzanine below the floor to capture the smoke carried by the
airflow. (Figure 4) install the sample pipes in the mezzanine below the floor(Figure 4)
