VX-402 has a multi-level detection pattern (from side view). A heat source beyond the
detection area may cause the detector a false alarm by reflecting off the ground.
Examples of reflective ground is water (puddle), wet road, smooth surface concrete and
asphalt road. Reflection rate is not 100% of course on the ground, however, if 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.
8.OPERATION TEST
1
.Turn LED indicator on. (See page 9.)
2
. Check and adjust the detection area. (See pages 7,8.)
1) Please adjust the detection length to
position B
.
The detection length will be
around
8m (27ft)
which
is rather shorter than ideal length but can remove
the chance of false detection.
a
b
IMPORTANT!
When the car or person goes near the detection area (a), please adjust the detection
area 1.5m to 2m (5ft to 7ft) shorter than movement area (b) and confirm by walk test.
Because, the actual detection area may change from 1.5m to 2m (5ft to 7ft) due to
the environmental thermal conditions.
When around 13m (43ft) detection area is required as shown below.
The detection area might increase when there is a
big temperature difference between the moving
object and the background.
1) If the detection length adjusted to
position
A[12m (40ft)]
, there is a possibility to detect
the car, depending on the environmental
thermal conditions.
Approx.12m(40ft)
position A
Approx.8m(27ft)
b
Approx.12m(40ft)
position B
a
Approx.8m(27ft)
position B
Approx.13m
(43ft)
In such case,
Confirm by walk test.
Detects at area a
and
no
detection at area b
.
2)
1)
2)
-13-
Example
alarm shop
