Choosing the right smoke detector type is critical for effective fire detection. We compare technologies and their applications.. Detector Technologies Optical (Photoelectric) Detects visible smoke particles (large particle fires) Good for smouldering fires Less prone to false alarms from cooking Most commonly specified in UK Ionisation Detects invisible combustion products (small particles) Faster response to clean burning fires More prone to false alarms Being phased out due to radioactive source disposal issues Multi Sensor Combines optical + heat + CO detection Best discrimination between real fires and false alarm sources Significantly reduces unwanted alarms Recommended by BS 5839 1 for false alarm prone environments Aspirating (VESDA) Draws air through sampling pipes to central detector Very early smoke detection capability Programmable sensitivity levels Ideal for heritage, data centres, clean rooms Concealed installation — no visible detectors For fire detection system design, contact us.