Planning In Rooms With Flat Ceilings - Siemens FDL241-9 Technical Manual

4.3
Building Technologies
Fire Safety
The infrared ray must be at least 30 cm away from ceilings, walls, fittings and

goods in stock to avoid unwanted reflections. You can use the adjustment
device to check for unwanted reflections. Instructions for this can be found in
the chapter 'Testing detectors [➙ 77]', in the 'Testing detection distance'
section. If the standardized signal value is greater than 5 %, you must increase
the distance by the infrared ray.
Ensure there is sufficient space around the detector such that the infrared ray's

entire adjustment range can be used.
If you use covers or enclosures for the detector, you must ensure sufficient

space around the detector such that e.g. the following work can be carried out
efficiently and without hindrance:
– Connect the adjustment device
– Set the detector optics
– Mount hood
After commissioning for the first time, the service personnel must be able to

access the detector safely and with ease, e.g. for maintenance and adjustment
work.
See also
 Testing detectors [➙ 77]

Planning in rooms with flat ceilings

Please note the following points if you are installing detectors in rooms with flat
ceilings. More information about the individual points can be found on the specified
pages.
8
7
6
5
1 Detection distance
2 Room height
3 Installation height
4 Width of monitoring area
Detection distance (1): Define the distance to be monitored. Depending on this,

define the type and number of reflectors. See [➙ 40]
Room height (2) and installation height (3): Define the installation height. In

high rooms, you must install detectors at different levels. See [➙ 42]
Planning in rooms with flat ceilings
1
2
3
4
5 Minimum distances to ceilings,
walls etc.
6 Distance between detector and
ceiling
7 Minimum distance between two
detectors
8 Detector or reflector
Planning
4
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2012-09-07