-9-
b
a
OPERATION TEST
9
9-A
Example of adjustment for false alarms
1
2
If there is a road where people or vehicles can pass in front of the detection area, and
can trigger false alarms, adjust the area as follows.
Delete the unneccesory detection area (a)
using the appropriate masking seal(s) 1 2 or 3.
(Reduce the distance fromo 12m, 9m, 5.5m ,4m (40ft., 30ft.,
18.3ft., 13.3ft.) as determined by the walk testing.
Actually move and check that the system does
not detect movement on the road (a) but does
detect when you enter the detection area (b).
The detection area might increase when there
is a big temperature difference between the
moving object and the background.
For example, when the detection distance is
set to 12 m (
40 ft.
), sometimes vehicles 13 m
(
43 ft.
) away
may be
detected.
In this case, set the detection distance to 9 m
(3 ft.). This shortens the alarm area but it can
reduce false alarms due to vehicles.
Caution>>
Approx. 9 m
(
30 ft.
)
Position B
Appro
x.
13
m
(
43
ft.
)
A heat source beyond the detection area may
cause the detector to cause a false alarm by
reflecting off the ground.
Examples of reflective ground is water
(puddle), wet road, smooth surface concrete
and asphalt road.
The heat source is strong and / or reflection
rate is high, detectors detection distance will
be longer than required and may detect
unwanted objects beyond. According to the
ground condition of the installation site, select
the detection range position.
Caution>>
