Segmented beams

August 2006 Perimeter Security, Alarms & Intruder Detection

The S.P.I. system (Segmented Perimeter Infrared system) is another first from MAMI research and development team.

A master unit controls up to eight infrared segments. Each segment consists of a transmitter-receiver unit, which covers a maximum of 20 metres. Each receiver of a sector is programmed with a different identity using jumpers on board.

The system is easy to install as all points connect to the same two wires, yet are capable of drawing power and relaying information concerning each specific segment to the system control unit.

Each segment can be programmed to have up to eight different detection times (from 0,3 to 18 seconds). This gives the user the choice of having different sides of his/her house responding in different ways to potential false triggering or sensitive areas.

Furthermore, each segment can accommodate more than one beam like in a grid so that more than one beam must be triggered before an alarm is recognised.

The master unit can be programmed to activate an alarm when either:

1 - Any three segments are activated within 1 minute.

2 - The same segment is activated within 1 minute.

3 - On activation of any segment.

For more information contact Renato Tarantino, MAMI, +27 (0) 11 452 4737,,


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