Smoke Detectors

For early fire warning shall be provided inside rooms and cabins and above false ceilings.   They shall be of electronic duel chamber combustion gas type construction, operating on the ionisation principle and  capable of detecting both visible and  invisible smoke.  The detectors shall have preset sensitivity controls and shall be connected to control panels.  The entire system shall be  wired to indicating  'fault' as well as 'fire' conditions with supervisory circuits  to signal component failure.