- Aspirating Smoke Detector ("ASD")
An aspirating smoke detector ("ASD") is a type of active smoke detection and alarm initiating device that includes three primary components;
- an aspirator;
- a sampling chamber; and
- a sampling pipe network.
An aspirating smoke detector helps overcome limitations of a fixed point smoke detector by actively drawing a representative sample of the air using an aspirator from within the protected area through the sampling pipe network and into the sample chamber. The sampling chamber is based on a nephelometer which is an instrument that measures the concentration of suspended particulates from smoke being drawing from the protected area.