Build High-Integrity Sounder Circuits Using a Single Loop
The system consists of a DINT1 Loop Controller Module and the popular BansheeMT sounders and FlashToneMT sounder/beacons, which are fitted with bi-directional short-circuit isolators in their base. The small DINT1 module is installed between the standard control panel sounder circuit and the loop and is designed for DIN rail mounting within a wall-mounted enclosure. Each loop can accommodate up to 45 sounders and multiple modules can be installed dependant on the size of system. All component parts are approved by LPCB to relevant parts of EN 54 and the system is fully compliant with BS 5839-1 using a single sounder loop.
In the event of a short-circuit the isolators will activate and disconnect the faulty section of cable and report (in monitoring mode) the fault to the control panel. When the sounders are activated, the loop is driven from both ends ensuring that all sounders will remain operational even in the event of a single short-circuit or open-circuit fault. Sounders and their isolator bases are installed just like any other conventional sounders on a twin core circuit.
Installations that rely on a ‘secondary sounder circuit’ consisting of a solitary back-up sounder are particularly prone to loss of sounders. For example, an installation with one back-up sounder near to the panel could lose all sounders on the main circuit during an emergency. This might not be apparent to an individual standing at the panel that is able to hear the back-up sounder operating, but they might be completely oblivious to the fact that the main sounder circuit might be partially or completely disabled. With the Loop Sounder System loss of even a single sounder on a circuit is very unlikely.
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