Combined alarms with multiple sensors utilise the results of the heat and optical sensors and uses the combined data to give earliest fire protection while giving full protection against false alarms.
Combined alarms with multiple sensors can be situated on the first floor landing, in living rooms and bedrooms and in the ground floor hallway. Because they monitor 2 different by-products of fire their response to all types of fire is significantly improved over single sensor alarms.
View our other guides to find out how different types of smoke and heat alarms work.
(doc:520 V1.0). Our articles are reviewed regularly. However, any changes made to standards or legislation following the review date will not have been considered. Please note that we provide abridged, easy-to-understand guidance. To make detailed decisions about your fire safety provisions, you might require further advice or need to consult the full standards and legislation.