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POLITEC | INSTALLATION MANUAL - VER.3.1
11.3 Precautions before installation - DUAL TECHNOLOGY
In the previous pages we wanted to represent the basic concepts of IR and MW individually,
highlighting the positive qualities and limitations of the two technologies, leading to the choice of
installing a Dual Technology perimeter protection system.
N.B.The dual technology barrier is always composed of two distinct columns, one with the TX part
and the other with the RX part of each IR and MW section.
The dual technology barrier concept determines the pairing of two different technologies, typically
infrared and microwave, as in this case, which give rise to the alarm condition in AND, i.e. when both
are subjected to a stress and reach the alarm threshold.
If the conditions of correct installation concerning the individual sections are respected:Active Infrared
Beams and Microwave, maximum results are obtained in terms of system operation and reliability.
This leads to the choice of an intelligent dual technology barrier and not because, critical
environmental situations, led to this choice since the barrier basically generates an AND alarm; if the
criticality for one of the two sections actually and permanently exists, this still remains, making the
system weaker.
If, on the other hand, the criticality can prove to be accidental or random due to climatic factors, the
choice of the dual technology barrier offers a significant advantage in terms of reliability in addition to
the considerable reduction of possible false alarms.
E.g.:heavy snow, growth of grass or shrubs moved by strong wind, fog, medium or large objects as well
as vehicles, left unintentionally in the vicinity of the microwave protection lobe etc.
Ultimately:
Each of the two sections must be able to work normally, as if it were on its own.
There should be nothing on the site that could permanently disturb either section.
The combination of the two technologies creates a situation of maximum reliability and security.
It is also recommended:
To manage the AND function in the alarm control unit, having brought the alarm outputs of the
individual sections, in addition to the accessory outputs.This allows the storage of any operating
faults and being able to intervene in a targeted way to solve the problem.
NOTE:
The IR section has the S.LOW function, i.e. the disqualification for fog which, if activated, blocks
the alarm relay by not opening the input on the control unit, consequently the system alarm condition
cannot occur when the Microwave section should generate an alarm.It is therefore recommended to
opt for: either not activating this function, which in case of lowering of the signal causes the alarm of
the IR section, or if you want to manage this function, as a signal, typically for the duration of the
weather condition, it is necessary to create the opening of the alarm input, of the IR section on the
alarm control panel.
MANA DT SMA
