CIAS Elettronica S.r.l. PYTHAGORAS3, Руководство пользователя

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CIAS Elettronica S.r.l. Ed. 1.3
Installation Manual Page 45 of 78 PYTHAGORAS 3
9.3 Installation Advice
For a correct installation of infrared barriers it is necessary to be aware of the following rules:
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Do not place the receiver so that direct or reflected sunlight can reach it. Direct or
reflected sunlight hitting the receiver can cause false alarms.
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Do not place the infrared barriers next to a highly reflective surface such as a white wall
or directly by a window as , in this case, the barrier can become insensitive (difficult to
generate an alarm).
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Do not place the barrier on an unstable mechanical support, such as fences that can
move, badly anchored poles, as, in this case, the barrier may cause false alarms.
9.4 Ground Conditions
It is not advisable to install the equipment along zones where there is: long grass (higher than
10cm), ponds, water courses along the line of the barrier and in general where the layout of the
ground can change rapidly.
9.5 Obstacles
Fences, if metallic, are very reflective and can cause different problems of reflection for the
microwave and it is therefore necessary to take some precautions:
- The fence must be firmly fixed so that there is no movement caused by the wind.
- Where possible the barrier must not be installed exactly parallel to the fence. It is then
necessary to create a small angle to the fence.
- When the sensitive zone is bounded by two metallic fences it is advisable to ensure that
the corridor is not less than 5m wide so that fence movements will not create
disturbances.
It should be noted that when using one of the “AND” scenarios
described in section 4, Pythagoras3 can be installed both in a corridor with
dimensions of less than 5m and parallel to a badly fixed fence.
- Metallic fence placed behind the units can create distortion of the sensitive zone.
Trees, hedges, bushes and vegetation in general require special attention when they are near
or inside the detection zone.
These obstacles are variable both by size and position because they can grow and be affected
by the wind.
Therefore it is not advisable to allow these types of obstacle in the protection zones.
It is possible to tolerate these obstacles only if their growth is limited by a regular maintenance
and their movement is limited by retaining fences. Inside the protection zone it is possible to
tolerate the presence of tubes, poles and various obstacles (lights, chimneys, etc.) as long as
their dimensions are not excessive within the detection lobes. These obstacles can cause
unprotected dead zones and hypersensitive zones, sources of false alarms.