Marmitek GB843 user manual For best detection, For best false alarm immunity

For best detection:

￿The sensor must always be in direct line of sight of all windows to be protected.

￿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.

￿If mounting on the ceiling, install the sensor 2-3m into the room.

￿Avoid installing in rooms with lined, insulating or sound deadening drapes.

￿Avoid installing in rooms with closed wooden window shutters inside.

￿Avoid installing in the corners of a room.

The GB843 is best suited to rooms with moderate noise.

￿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:

￿Locate the sensor at least 1.2m away from noise sources (televisions, speakers, sinks, doors, etc.).

￿Avoid rooms smaller than 3m x 3m and rooms with multiple noise sources.

￿Do not use where white noise, such as air compressor noise, is present (a blast of compressed air may cause a false alarm).

￿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.

￿Avoid humid rooms – the GB843 is not hermetically sealed. Excess moisture can eventually cause a short and a false alarm.

Areas to avoid:

￿Glass airlocks and glass vestibule areas

￿Noisy kitchens

￿Residential car garages

￿Small utility rooms

￿Stairwells

￿Small bathrooms

￿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.

3 © MARMITEK