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3 © MARMITEK
For best detection:
x The sensor must always be in direct line of sight of all windows to be
protected.
x If mounting on the wall, try to install the sensor directly opposite the
protected window. If this is not possible, adjoining side walls are also a
good location.
x If mounting on the ceiling, install the sensor 2-3m into the room.
x Avoid installing in rooms with lined, insulating or sound deadening
drapes.
x Avoid installing in rooms with closed wooden window shutters inside.
x Avoid installing in the corners of a room.
The GB843 is best suited to rooms with moderate noise.
1
The sensor may not consistently detect cracks in the glass, bullets which break
through the glass or glass breaking around corners and in other rooms. Glass
break sensors should always be backed up by interior protection.
For best false alarm immunity:
x Locate the sensor at least 1.2m away from noise sources (televisions,
speakers, sinks, doors, etc.).
x Avoid rooms smaller than 3m x 3m and rooms with multiple noise
sources.
x Do not use where white noise, such as air compressor noise, is
present (a blast of compressed air may cause a false alarm).
x Do not define the zone as 24hr. It is recommended to register the GB843
to a perimeter arming group that arms the perimeter doors and windows of
the premises.
x Avoid humid rooms – the GB843 is not hermetically sealed. Excess
moisture can eventually cause a short and a false alarm.
Areas to avoid:
x Glass airlocks and glass vestibule areas
x Noisy kitchens
x Residential car garages
x Small utility rooms
x Stairwells
x Small bathrooms
x Other small acoustically live rooms
For glass break protection in such applications, use shock sensors on the
windows or window frames connected to an US832 universal transmitter.