Here’s a design circuit for sound its Siren only once. That is – when the alarm is activated – the Siren will sound for a preset length of time. Then it will switch off and remain off. The alarm will not re-activate. This is the figure of the circuit;
A range of Expansion Modules allow you to add any number of Instant Alarm Zones, Personal Attack Zones and Tamper Zones to your system. There’s also an Untimed Output Module. It will keep an internal sounder, strobe-light, lamp or whatever going after the siren has stopped. The basic circuit has a single zone with independently adjustable Exit and Entry delays. The zone will accommodate the usual types of normally-open and normally-closed input devices – such as pressure mats, magnetic-reed contacts, micro switches, foil tape and PIRs. Before you set the alarm – make sure that the building is secure – that ALL of the Green LEDs are lighting – and that the Yellow LED is off. If the Yellow LED is lighting – there’s a fault in one of the zones.
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