How to choose smoke detector

WHICH SMOKE DETECTOR IS THE RIGHT ONE TO USE?

Selecting the correct type of detector (area or duct) with the correct principle of operation is very important. Area and duct smoke detectors are categorized according to the principle of operation utilized to sense the smoke. The two most widely used duct detectors are the photoelectronic type and the ionization type.

Ionization smoke detection is based on the principle of ion flow within a chamber. An alarm condition occurs when the ion flow is affected by smoke particles. This type of detector is most effective near the fire source.

Photoelectronic smoke detection is based on the principle of optical detection. It is also known as the "scattered" light principle. An

alarm condition occurs when smoke particles enter a light path and some of the light is "scattered" by reflection and refraction onto a sensor. This type of detector is best for areas where dense smoke may occur, such as in ductwork