User Manual

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Siemens Building Technologies
Cerberus Division
01.2002
3.4 Concept for fire detection
Basic concept for
• Clean room monitoring
– High sensitivity air sam-
pling smoke detection sy-
stem with HSD detectors
For early fire detection through the monitoring of extract
air from the clean room.
– and additional MB2 detec-
tor boxes with DO1153
The MB2s automatically alert the fire department in the
second alarm stage
– DO... point-type smoke de-
tectors with the most sensi-
tive parameter set
To monitor the ceiling voids and air return areas particu-
larly found in large installations.
• Service areas
– Point type smoke detectors
type DO11..
To provide redundancy for the HSD detectors, point-ty-
pe smoke detectors are mounted on the ceiling of the
room in the service areas as for the monitoring concept
for EDP systems (25m
2
per smoke detector)
– Manual call points To manually alert intervention forces
Additional possibilities
– D2410 maximum tempera-
ture heat detector with tef-
lon-coated capillary tube
To monitor process extract air
– DF11.. infrared flame
detector
In areas where dangerous solvents are used and fla-
ming fires are expected.
– DF11.. infrared flame
detector
Ceiling voids, in which filter fan units are installed, must
be monitored against flaming fires with infrared flame
detectors (see also Fig. 17).
Smoke from an overloaded but still functioning filter fan
unit is difficult to detect because the smoke is immedia-
tely blown into the filter section and deposited there.
Only if the filter section is burnt through can smoke pe-
netrate to the clean room and be detected. If in a fire the
filter fan unit malfunctions, the smoke is blown in the re-
verse direction back into the ceiling void (due to the
overpressure in the clean room) where it is extracted by
other filter fan units and deposited in the filters.
– Air sampling smoke detec-
tion unit DBZ1197/DO1153
The treated outside air and circulated air must always
be monitored after the air handling equipment by air
sampling smoke detector units type DBZ1197/DO1153.
This enables fires in the air handling equipment as well
as smoke drawn in with the outside air to be detected
at an early stage.
The air handling control must be layed sown with the
customer or the engineering company.