Model Mk3 - Alarm System
From Monitoring Systems
The Mk3 alarm panel can monitor up to 12 separate locations, each location has a separate isolator key switch built into the panel along with an external/internal selector switch for the sounders, auto dial on/off and an alarm reset switch.
The Mk3 panel monitors it's own power supply and standby battery condition, should the power fail it will generate an alarm, should the battery condition start to fail it will give a signal to the central monitoring station.
The complete alarm system works on a '0' volt closed circuit and as such is a fail-safe system, should a cable break or any equipment go faulty the alarm would operate.