3.1.3 Air via capillary tubes
The aspirating hole can be connected to the room being monitored via a capillary
tube.
The number, distribution, and diameter of the aspirating holes in the pipes must be
planned individually for each application.
Examples
● Aspirate air in control cabinets.
● Mount the pipe system in a false ceiling and aspirate the air in the room below
it.
Fig. 6: Pipe system with capillary tube
Planning capillary tubes
Take note of the following:
● Inner diameter of capillary tubes 5…7mm
● All capillary tubes in the pipe system must be the same length
● Maximum length of capillary tubes 8000mm
● If air from separate control cabinets is to be aspirated via the capillary tubes,
take note of the following:
– Direction of airflow in the control cabinet due to ventilation
– Airflow conditions in the control cabinet in the event of fire
Always use the software 'FXS2056 ASD Asyst‑Tool V3' to plan the pipe system –
this will ensure you achieve the optimum design.
System description
Air aspiration
3
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