©
CIAS Elettronica S.r.l.
Ed. 2.4
2.3 Installation Advice
For a correct installation of infrared barriers it is necessary to be aware of the following rules:
Do not
position the receiver so that
direct or reflected sunlight
can reach it. Direct or
reflected sunlight hitting the receiver can cause false alarms.
Do not
position the infrared parriers 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 alrm).
Do not
position the barrier on an unstable mechanical support, such as fences that can
move, badly achored posts, as, in this case, the barrier may cause false alarms.
2.4 Ground Conditions
It is not advisable to install the equipment along zones where there is: long grass (higher than
10cm), E' sconsigliabile installare l'apparato lungo tratti dove vi siano: erba alta (maggiore di 10
cm), ponds, water courses along the line of the zone and in general where the layout of the
ground can change rapidly.
2.5 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 in the wind.
- Where possible the zone must not be installed directly parallel to the fence and it is
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, Pythagoras can be installed both in a corridor with
dimensions of less than 5m and parallel to a badly fixed fence.
- Metallic fence posts behind the units can create distortion of the sensitive zone.
Trees, hedges, bushes and vegetation in general require special attention so that they are
neither near nor in 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 only if their growth is limited by regular routine maintenance and
their movement is limited by containment barriers. Inside the protection zone it is possible to
tolerate the presence of tubes, posts and various obstacles (lights, chimneys, etc) as long as
the dimensions are not excessive within the detection lobes. These can cause unprotected
shadow zones and hypersensitive zones, sources of false alarms.
Installation Manual
Page
32
of
56
PYTHAGORAS
