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Chapter 8 • Mounting and connection of pneumatic components
8.2.5
Connection diagram for far-flung pipe systems with master-slave mode of the Purging units
If the needed air flow rate exceeds the value of one Purging unit, two Purging units have to be
interconnected in the master-slave mode. The following diagram shows the schematic connection
of the components needed for purging far-flung pipe systems, using the example of a double-U
pipe system in the master-slave mode, in which both U pipe segments are purged together.
Fig. 9:
ASD with one pipe network and two F-BO-AFE70's in master-slave arrangement. In the
example, two F-BO-AFE70's are needed because of the total aperture area of the aspiration
holes.
As a supplement to Fig. 2 (page 10), the electrical connection cables are not shown here in order
to provide a clearer overview; however, the logical sequence of the Purging process has been
drawn in with red dotted arrows.
A ... Aspirating smoke detector with pipe networks in double-U design
B ... F-BO-AFE70 (master) for the first U pipe network
C ... F-BO-AFE70 (slave) for the second U pipe network
D ... Filter for the entire pipe network. Since most aspirating smoke detectors only permit one
E ... A pressure regulator must be used if the compressed-air supply used can exceed the per-
Which one of the two Purging units works as master unit and which one as slave unit is only
determined by the order in which they are cabled. The unit which receives the fault message from
the ASD is the master unit, the unit that is actuated by the master unit is the slave unit.
external filter per pipe system, in the example above the filter must be located before the two
Purging units (option).
missible pressure.
User Manual Series F-BO-AFE70
I56-4252-010
D200-104-00
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