LGWP-15/40/VC/HC Wireless PIR Detector Installation Handbook
Page 12
Pulse count
Counts the number of pulses caused when a person walks across the detector’s
field of view. The greater the number, the more the person has to move to
cause an alarm. Pulse count 1 is very sensitive while pulse count 4 is quite
insensitive. Experiment with the setting to optimise the results so that
persons are detected in good time but not so sensitive that the detector may be
prone to false alarm from incidental movement from trees, shrubs, loose
materials etc.
Sensitivity
The normal setting is 0. Low sensitivity is sometimes needed to reduce the
detection distance.
Higher sensitivity increases distance but also increases the risk of false
activation from environmental conditions.
AND / OR
The Genesis 2 PIR detector uses a Quad in line pyro sensor which
acts like two separate sensors side by side.
The AND / OR mode can select whether both sensors must detect movement
together or whether only one or the other is required.
AND gating is the best form of filtering out nuisance alarms from loose
materials, foliage and reflections.
OR gating is more sensitive and may be selected when fast moving objects are
to be detected.
Power saving
Busy sites such as school playgrounds, car park entrances etc can cause an
unnecessarily large number of alarm transmissions.
Although these alarms may be ignored during the day time it is still wasteful of
battery power and therefore in these circumstances it is recommended that the
Power saving mode be selected.
There are four types of power saving which may be selected to suit.
1.
An alarm can only be sent after 3 minutes of inactivity
2.
An alarm can only be sent after 10 minutes of inactivity
3.
An alarm can only be sent after 30 minutes of inactivity
4.
The same as 3 but with an accumulative timer which can extend the 30
minutes if the site remains very busy.
In addition the sleep timer does not initiate after the first alarm but instead
after a build up of activity.
Fig 4 shows PIR’s communicating directly
with the Masthead. All Sub Nets are 1.
LGWP-15/40/VC/HC Wireless PIR Detector Installation Handbook
Page 9
Fig 4.
Fig 5.
Fig 6.
Fig’s 5 & 6 show
examples where one or
more repeaters are used
and how the Sub Net
Codes separate the
system.
SUBNET 1
SUBNET 1
SUBNET 2
SUBNET 1
SUBNET 2
SUBNET 3
PIR
PIR
PIR
PIR
1 Masthead
MAST
SYSTEM
CONTROLLER
SYSTEM
CONTROLLER
MAST
PIR
PIR
PIR
PIR
PIR
PIR
REP
1 Masthead &
1 Repeater
REP
PIR
PIR
PIR
PIR
PIR
PIR
PIR
REP
MAST
SYSTEM
CONTROLLER
1 Masthead &
2 Repeaters
KEY
KEY
KEY
