Planning
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4.5.2
Principles of equipment monitoring
Notice
Equipment monitoring is subject to the following principles:
•
The country-specific application guidelines must always be adhered to.
•
In equipment monitoring it preferable to use Classes A and B compliant with EN 54-20.
•
Equipment monitoring applications using the ASD 532 are additional monitoring applications to space surveil-
lance.
•
Planning with
the “ASD PipeFlow” calculation software is preferable
. This guarantees optimal detection
behaviour and ensures that the technical system limits are optimally utilised. If for any reason the calculation
with ASD PipeFlow is not possible, the thresholds as set out in Sec. 4.5.4 must be observed.
•
Symmetry is not required for equipment monitoring.
•
Unlike space monitoring, which involves individual sampling holes, equipment monitoring involves the use of
sampling fixtures
with several sampling holes.
•
The
sampling fixture
is defined as a small pipe entity in the shape of an „I”, „U”, „T”, „H” or other form with
typically 2 to 4 sampling holes.
•
The sampling fixtures are arranged in such a way relative to the object that they intake the air outflow (ventila-
tion slot or screen). Ideally the sampling holes are distributed symmetrically on each sampling fixture over the
surface of the opening / screen.
•
On objects with a high air-flow rate (strong ventilation), the sampling holes can be fitted with SF ABS sampling
funnels for optimal smoke detection.
•
The systems should be formed in such a way that false alarms are avoided.
4.5.3
Examples of sampling pipe layouts for equipment monitoring
Fig. 11 Equipment monitoring layout variants (examples)
ASD 532
Computer unit
(view from rear)
Sampling device with
sampling holes
Sampling fixture with
sampling holes
Ventilation opening
Ventilation openings
Flexible
sampling
branch
Flexible sampling
branch
Sampling
branch,
rigid or flexible
Supply line /
trunk line
in hollow floor
Supply line /
trunk line
Supply line /
trunk line
Sampling stub with
sampling hole
in the end cap
Pipe line through hollow floor
Direct mounting on ventilated EDP cabinets
Direct mounting on electrical cabinets without ventilation
Pipe line through wall or ceiling
Sampling fixture
with sampling holes
Ventilation openings
ASD 532
ASD 532
2
1
3
n
Class A
4
I-shaped
(
)
as show
Shape of the sampling pipe:
Class B
6
Class C
8
Example:
maximum possible number of server cabinets
when calculating with ASD PipeFlow
(with 2 sampling holes per cabinets)
:
4
U/T/H-shaped
6
8
ASD532 Operating Manual
Summary of Contents for ASD 532
Page 1: ...ASD 532 Aspirating Smoke Detector Operating Manual ...
Page 2: ...2 88 ASD532 Operating Manual ...
Page 6: ...6 121 ASD532 Operating Manual ...
Page 7: ...Document history 7 121 Document history First edition Date 15 10 2015 ASD532 Operating Manual ...
