©
CIAS Elettronica S.r.l.
Ed. 2.4
Scenario “B” : AND
Selecting this scenario will produce an alarm if at least two of barriers regardless to the
technologies, and regardless to the sequence (priority), detect an alarm condition. For example,
first low IR and then MW = alarm, first MW and then low IR = alarm, first low IR then high IR =
Alarm.
Scenario “C” : AND with Anti-climb
Selecting this option will produce an alarm if at least one MW barrier pair and the middle IR or
MW and bottom IR reach alarm conditions or if only the top IR (anti-climb) reaches alarm
condition.
This scenario allows an increased probability of detection in positions where it may be possible
to elude the detection by climbing.
Note:
middle IR is optional.
Scenario “D” : AND with Anti-creep
Selecting this option will produce an alarm if at least one MW barrier pair and the middle IR or
MW and bottom IR reach alarm conditions or if only the bottom IR (anti-creep) reaches alarm
condition.
This scenario allows an increased probability of detection in positions where it may be possible
to elude the detection by crawling on the ground for example where the barriers overlap when
the length of one barrier is insufficient.
Note:
middle IR is optional.
Scenario “E” : AND with Anti-creep and Anti-climb
Selecting this option will produce an alarm if at least one MW barrier pair and the middle IR
reach an alarm condition or if only the bottom IR (anti-creep) or only the top IR (anti-climb)
reach alarm conditions.
This scenario allows an increased probability of detection in positions where it may be possible
to elude the detection by crawling on the ground or climbing.
Note:
middle IR is optional.
Scenario “F” : OR
Selecting this option will produce an alarm if any single barrier reaches an alarm condition. For
example, only bottom IR or only MW or only middle IR or only top IR.
The selection of this option gives the greatest probability of alarm but also creates the greatest
probability of false alarms and should only be used in the highest security situations when a
high false alarm rate is acceptable.
Note:
middle IR is optional.
Important Note:
The indication to the processor of disqualification of any of the three IR
barriers available in the Pythagoras barrier, produces not only the activation of the appropriate
relay on the receiver but also a reconfiguration of the MW barrier, reducing the sensitivity by 3
steps from the sensitivity set during installation. For example if the installed value of sensitivity is
set to the default value of 7, when an IR barrier signals disqualification the MW sensitivity is
reduced automatically to 4. In these alarm conditions from only the MW barrier an alarm is
produced for any scenario selected. In this way better advantage can be taken of the detection
capabilities for each technology in relation to the probability of detection minimising the
production of false alarms by using the best operational parameters when real events can
reconfigure the functionality of the entire barrier without loosing the capability to protect the
zone even in thick fog or heavy rain.
Installation Manual
Page
48
of
56
PYTHAGORAS
