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Figure 13 – most
sensitive trigger
Figure 14 – no trigger
3.8.5. The Tamper Switch
The tamper switch will open whenever the front cover of the
detector is removed. A tamper signal is automatically
transmitted as well as a normal trigger signal. Each time this
occurs the detector will also automatically enter test mode.
In figure 13, a body moving from position 1 to position 2,
into the infrared beam zone, will create a pulse. Moving
from position 2 to 3, out of the other side of the same
infrared beam zone, will create another pulse. If the
detector is set to "most sensitive" and the body moves
from position 1 to position 3 within 10 seconds then the
detector will have received 2 pulses in 10 seconds. This
means the detector will have made a valid movement
detection and will trigger, indicated by the red light (only if
in test mode or normal mode but not in IPS mode). This
also applies if the body moves in the opposite direction.
No trigger body movements are body movements which
are too small to be recognized as valid body movements to
trigger the detector.
In the example, shown by figure 14, a body walking into
one side of the infrared beam zone, then back out the same
side of the infrared beam zone will not trigger the detector.
A body moving from position 1 to 2, into the infrared
beam zone, will only create pulsing. A body moving from
position 2 back to position 1 or from position 2 to position
3 (out of the same side of the infrared beam zone) may
create further pulses but will not trigger the detector. This
also applies if the body is moving in and out of the infrared
beam zone from the other side.
Triggering the detector when
set to "most sensitive"
No trigger body movements
Tamper switch
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