Aspirating smoke detectors

Smoke is a complex mixture of gases, liquids and solid particles depending on the material that is burning and on the conditions of combustion. Each of the constituents of smoke displays particular optical and physical properties which are exploited in the two main types of detectors - optical and ionisation. Aspirating smoke detectors use either optical or ionisation detectors. The general requirements for fire alarm smoke detectors are contained in BS EN 54 with detailed requirements for smoke detectors covered in Part 7. 

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