Aspirating Smoke Detection
In contrast to inactive smoke sensing devices which includes spot sensors, Aspirating Smoke Detection systems intentionally attract smoke particles towards the sensor by means of drill out holes inside of a piping strategy that operates through the entire protected region.
In addition, Air Sampling Smoke Detection systems encompass reliability supervising to make sure a fault signal is given at any moment the Air Sampling Smoke Detection’s capability to sense smoke particles is affected. This isn’t the situation with inactive systems which are usually simply electrically supervised without having the capability to decide if the smoke can really get through to the detection component.
Aspirating Smoke Detection systems consist of one or more degree of alarm, usually configurable. This enables an Air Sampling Smoke Detection system to deliver extremely early notification of a situation, forcing inspection within the earliest smoldering phase of a fire enabling the fire to be effortlessly dealt with. Additional alarm stages can be set up to deliver fire alarm inputs to fire systems including activation fire Extinguishing systems. Air Sampling Smoke Detection alarm sensitivities are adjustable and can be designed to adjust to various levels starting from many, many times more susceptible than the usual traditional detector, to a reduced amount of sensitive. The detectors perform best within non-volatile conditions. They may also be applied in computer system cabinets to inform end users towards the getting hot of computer cabling or certain computer components.
When considering fire alarm systems, there are usually three basic parts of the system to consider.
Fire Alarm Control Panel
Sounders and outputs
Air sampling systems come under the detection part of the system. It performs the same function as a standard smoke detector, but on a much larger scale and greater sensitivity. It can detect smoke much early then your standard type of detection, can operate in adverse conditions and can be hidden from view in areas that are concern about aesthetics
The biggest brand name in air sampling fire detection is VESDA, now owned by Xtralis. Xtralis also manufacturer the ICAM. The other manufacturers within this field are Kidde AirSense and Wagner.
As with all forms of detection, air sampling systems having many advantages and disadvantages. Furthermore, designing and installing such systems should be carried out by a competent fire alarm company with a proven track record of installing air sampling detection systems. Please review this section to find out more.
Within an aspirating smoke detection system, air specimens are drawn, using a fan or extractor pump, through sampling detection points (small holes in a network of piping) inside a protected area, to a detector sensing chamber. The sensing chamber used may be of the ionization detector type, but normally works on optical principles and is normally extremely sensitive. A sensitivity of several hundred times that of normal smoke detectors is possible to achieve.
The quantity of air going into every sampling detection point is generally minor, and should not be viewed as changing air or smoke flows inside the protected area. In most cases, each individual sampling point could be thought of as an independent point type smoke detector so long as a single sampling point provides the same awareness as a point type smoke detector.
These systems are frequently used for the protection of computer, communications and sensitive electronic equipment rooms, in which it is quite common to use them for monitoring return air to air conditioning units.
Very small amounts of particulate matter produced by even an extremely small smoldering incident can often be detected by this means, since these combustion products are carried by the return air to the sampling points in the pipework of the aspirating system. It is not uncommon for incidents such as the burning out of electronic components in equipment cabinets to be detected in this way, even though on initial inspection of the room there is no visible smoke. Aspirating systems are sometimes used within atrium spaces in buildings, where vertical runs of pipework can sample smoke from different levels, at any of which stratification might occur.
Aspirating systems are also sometimes installed in stately homes and similar buildings. Here the reason is not the high sensitivity normally associated with such systems, but the possibility of providing virtually ‘invisible’ protection; the pipework can be installed above ceilings, and small bore capillary tube is passed through small holes drilled in the ceilings.
Aspirating systems are also sometimes used in situations where access to point smoke detectors for maintenance would be difficult. An example is at high levels within an atrium space or in a high-level ceiling void.
Blazer Automatic Aspirating Smoke Detection Maintenance
Maintenance of a fire alarm system is important if you want the system to work in the event of a fire emergency. Most systems will have a predetermined time when the maintenance work should be undertaken. However, the best way to maintain any equipment is if the maintenance can be carried out automatically. The equipment to be discussed in this blog, is a device called the “Blazer. The unit cleans the pipework automatically and is known as an “Air Sampling Detection Maintenance Unit”
Air sampling detection systems such as VESDA – Xtralis, Stratos, ICAM and others, have a detector that samples the quality of the air looking for any smoke particles. The air is drawn via a suction pump through a network of pipework that is situated throughout the area being protected against fire. However, as the suction pump draws in the air the pipe will become contaminated with the dust and dirt particles and will block the sampling holes within the pipework and clog the filter. Air sampling systems that do not clean the pipes during the maintenance run the risk to their fire alarm system producing false alarms or having flow faults.
To avoid this from happening the pipes will have to be cleaned during the fire alarm maintenance visit. This would require the engineer using a vacuum or blowing device to clean the dirt and dust from pipework.
The Blazer – Automatic Maintenance Unit for Air Sampling Systems
However, the Blazer once installed, will automatically clean the air sampling pipes on a regular basis automatically. See the video to see exactly how this unit works.