User Manual

e1851a
12
Siemens Building Technologies
Cerberus Division
01.2002
4.1.4 Air sampling smoke detection system concept
In this situation the best location for an air sampling smoke detection system is the service
area through which the air from the clean room blows before it is taken back to the air purifi-
cation system.
The ideal location for the detection of fire aerosols from the clean room would be the extract
air vents at floor level where the air from the clean room flows into the service area. Unfortu-
nately this zone is unsuitable for the installation of air sampling tubes due to the technical
equipment and installations.
We have therefore decided to monitor the air flow for fire aerosols only at the ceiling in the
service area. For this purpose a U-shaped tube system is mounted near the ceiling at a
height of 2m.
Each U is connected to an MB2 detector box. The air from three detector boxes is trans-
ported to an HSD detector.
4.1.5 Concept for point-type smoke detectors
In the service sector, in addition to the air sampling smoke detection system, DO1151
smoke detectors with a monitoring area of 25m
2
per detector and with a maximum distance
between detectors of 5m are mounted on the perforated ceiling.
Legend:
HSD detectors 0.1%
with built-in fan
MB2 detector boxes
Air sampling tube
Point-type smoke de-
tector
Corridor area Service area, technical
zone with air cleanli-
ness class 100,000
Clean room areas with
workplaces and air cleanli-
ness class 1000 to 10,000
Fig. 3 All service areas or technical zones are fully monitored
4.2 Factory for the production of microchips
The following examples taken from practical situations were realized with the MP2424 air
sampling chamber. In the meantime, this product has been replaced by the AD1 and AD2
active detectors. For this reason we are showing the system configurations with AD2
devices.