Timeguard MLSA360N - Manual (Page 14)

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4. Selecting the Location
Please note:- PIR sensors are not suitable for installation in glass
enclosures such as porches or conservatories. PIR sensors do not
detect through glass and need a clear unobstructed view of intended
detection area.
The motion detector has a number of detection zones, at various vertical and
horizontal angles as shown. 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 1.8m.
Careful positioning of the sensor will be required to ensure optimum
performance. See detailing detection range and direction. The sensor is
more sensitive to movement ACROSS its field of vision than to movement
directly TOWARDS.
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). Reflective surfaces
(ie pools of water, conservatories 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.
Light Pollution
To reduce the risk of light pollution, consider the following when installing
the unit.
Position the unit to ensure that the light emitted does not encroach onto
neighbouring properties. Angle the floodlight downward to focus the illumination
onto the ground, not into the sky. Consider using a lower wattage bulb to save
energy and reduce high light output if not required.