HomeMatic HM-Sec-MDIR-3 Bedienungsanleitung Seite 40

Mounting
When mounting the motion detector, please ensure that
it is not installed directly on or in the vicinity of large
metal objects (heaters, aluminium clad walls, etc.), as
this would reduce the wireless range.
Keep pets away from the protected area as far as
possible to prevent them from triggering a false alarm.
If you cannot do this, try to align the detection area
accordingly by adjusting the height of the device. If
necessary, cover the lens for creep zone protection.
Please bear in mind that pets can also jump up onto
cupboards, for example, which may bring them into the
detection range.
To reduce the risk of a false alarm being triggered, the
motion detector must not be exposed to direct sunlight,
car headlights, etc., nor must it be mounted in the
vicinity of a heat source (above a heating appliance, for
example). The detection ranges must be aligned
against a wall or the floor, but not directly on a window,
heater or other heat source.
Movements transverse to the motion detector can be
detected easier than frontal movements.
The effectiveness of the detection procedure depends
on the temperature difference between the moving
object and the relevant background.
It is not possible to detect motion through glass.
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