Air sampling detectors are also known as detection of aspiration smoke (ASD).
In any application where a conventional smoke detector can be used, air sampling systems can be used. It can also be used in environments where the use of conventional detectors is problematic, such as high air currents.
These systems are most often used in special detection situations such as room monitoring (storage rooms, cooling facilities, computer rooms, art galleries, aircraft hangars) and for object monitoring (control panels, IT and telephone facilities, radio stations).
Mode of Operation:
Air is continually drawn (by a pump) through an air sampling tube network from the protected area. The typical sampling network is covered by a maximum area of 1.858 m2. This air sampling is fed through a chamber of detectors. The air sample is monitored for smoke content in a way similar to a light scattering photoelectric ceiling detector.
The pump, air filtering and smoke detection features are all highly specialized to the extent that the control unit can measure smoke levels quite accurately. The ASD triggers an alarm when the average smoke concentration of all sample openings exceeds the threshold level of the alarm.
It does not matter whether this value is caused by a very high concentration of smoke at one opening of the sample or by a slightly higher concentration of smoke at several openings.
Applications:
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Rooms with a high concentration of valuable properties in which even the smallest concentrations of aerosols must be detected.
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Very high rooms where the concentration of smoke under the ceiling is diluted due to the large volume.
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Large halls in which it would be more difficult to maintain spot - type detectors or where spot - type detectors would be substantially more expensive than air sampling detectors.
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Areas where spot-type detectors are prone to contamination (recycling facilities, heavy-duty industry).
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Rooms where strong misleading phenomena such as condensation of moisture are expected