4
5. Selecting a Location
• The motion detector has number of detection zones, at various vertical
and horizontal angles as shown (see diagram A).
• A moving human body needs to cross/enter one of these zones to activate
the sensor. The best all-round coverage is achieved with the unit mounted
at the optimum height of 3 metres.
• Careful positioning of the sensor will be required to ensure optimum
performance (see diagram A detailing detection range and direction).
• The sensor is more sensitive to movement ACROSS its field of vision
than to movement directly TOWARDS (see diagram B). Therefore position
the unit so that the sensor looks ACROSS the likely approach path.
• Avoid positioning the sensor where there are any sources of heat
in the detection area (extractor fans, tumble dryer exhausts etc.)
including opposite any other light sources such as other security lights.
• Reflective surfaces (i.e. pools of water or white painted walls)
and overhanging branches may cause false activation under
extreme conditions.
• During extreme weather conditions the motion sensor may exhibit
unusual behaviour. This does not indicate a fault with the sensor.
Once normal weather conditions return, the sensor will resume
normal operation.
6. Installation
• An isolating switch should be installed to the switch the power ON & OFF.
This allows the sensor to be easily switched OFF when not required for
maintenance purposes.
• Remove the back plate from the PIR sensor (see diagram F).
• Mark the position of the fitting holes. Drill the holes. Insert the rawl
plugs into the holes.
• Pass the supply cable through the cable entry point on the back plate,
ensuring the grommet(s) is used to maintain the IP rating of the
PIR sensor.
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