Siemens FDL241-9, Technical Manual

Page: 34 / 90

Planning 4
Fields of application
34
Building Technologies
007016_i_en_--
Fire Safety 2012-09-07
4 Planning
4.1 Fields of application
Typical fields of application of the linear smoke detector
Application area Reason
Buildings with historically valuable ceilings Fire detector installation on ceilings is not
desirable or possible.
Atriums, detection on multiple levels Point detector unaccessible due to height
Smoldering fire detection not possible with
point detectors
Large rooms and high halls Lower investment costs
Churches No impairment of the ceiling by installation
or point detectors
Long corridors, cable and energy ducts with
a room height of more than 3 m
Lower investment costs
Airplane hangars with stable building
construction, in which flame detectors alone
do not suffice
Lower investment costs
Saw-tooth roofs, where point detectors must
be suspended lower
Lower investment costs
Examples of fields of application of the linear smoke detector
4.2 General planning information

Between the detector and the reflector therer must be permanent, undisturbed
visual contact.
– The infrared ray must not be interrupted by moving objects, e.g. cranes,
ladders, transportable objects, cobwebs.
– Vision impaired by dust, vapor or smoke generated as a result of operation
may impair the system.

The detector's installation location must be absolutely statically stable, as the
admissible deviation of the infrared ray is max. 0.1°. Examples:
– Concrete and brick walls are suitable.
– Wood and steel girder constructions are unsuitable, as temperature and
humidity fluctuations, wind or snow pressure influence on such
constructions.

The detector and reflector must be securely installed on the installation surface.

In the case of detection distances greater than 50 m, position the detector and
reflector as close to opposite one another as possible. This makes adjustment
easier.

Position the detector near the ceiling, as the smoke is generally only sufficiently
think to trigger an alarm in the mushroom cloud.

Avoid bringing the detector into direct contact with sunlight, halogen lights etc.