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6 Sensitivity Settings for Range and Mounting Height
The various settings of the PIR are made by means of multiple DIP - Switches on the printed circuit board.
The
DIP – Switches 1 and 2
are for
sensitivity setting
depending on the required detection performance. If the
maximum required range is less than the nominal range of the detector, it is recommended to reduce the overall
sensitivity to reduce nuisance alarms.
*) With the
DIP - Switches 1 and 2
both set to
„on“
, the sensitivity can be adjusted with the installation software.
If the sensitivity is adjusted with the installation software,
the programmed value will remain active also
following a power off
.
The IR 454 / IR 464 is designed for mounting at heights between 2.5 and 4.0 m above ground. The
seventh DIP
Switch
is used to set the relative sensitivity of all detection zones in function of the
mounting height
as
recommended below:
If the mounting height is less than 2.5 m, a detection gap at app. 10 m distance may be observed for fast
movements. This is due to the overlap of the three zones and resulting rejection of simultaneous signals.
7 Adaptive Threshold Discrimination (ATD)
The background noise is constantly averaged and used to adjust the threshold levels for the alarm. This special
feature is reducing the probability of nuisance alarms caused by wind, moving vegetation or objects that have a
thermal contrast although usually weaker than a person.
Each signal exceeding a certain minimum value will activate the ATD and increase the threshold levels depending
on its strength. The time constants for increase and decrease are chosen in a way to adapt to gradual changes.
Signals generated by a person moving within the specified speed range, however, are strong enough for detection.
Repeated movement of any kind within the field of view is therefore activating the ATD, reducing the overall
sensitivity. This has to be noted particularly when walk testing the following installation.
The
DIP – Switch 3
is used to activate or deactivate the
ATD
(Adaptive Threshold Discrimination).
*) Operation of the PIR in this mode is possible but not recommended in outdoor applications as the nuisance
alarm rate could increase significantly as a result of turbulences.
•
When walk testing the unit, the threshold level will increase as a result of the signal generated by the target
and decrease exponentially in time after the event. To make sure that original sensitivity is reached, wait at
least for 3 minutes between each crossing or disable the ATD function by setting DIP - Switch 3 to „off“.
If the Installation software is used for monitored walk tests and the DIP – Switches 1 and 2 are set to software
settings (on – on), the threshold level can be kept to its nominal value by changing the configuration of the ATD to
„off“ for this test.
Switch
1 and 2
PIR-100
Overall Sensitivity
PIR-100H
Overall Sensitivity
off – off
60 m
75 m
off – on
84 m
105 m
on – off
Max. Range
Max. Range
Factory Setting
on – on
Software Settings
Software Settings
Switch 7
Mounting Height
off
„Low < 3.0 m“
on
„High > 3.0 m“
Factory Setting
Switch 3
ATD
off
off
*)
on
on
Factory Setting
Содержание Eagle PIR-100
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