How much volume of smoke needed to activate an optical smoke detector?

The volume of smoke required to activate an optical smoke detector typically ranges from 0.1 to 1.0% obscuration of the light beam within the detector. This translates to approximately 1 to 10% of the volume of the detector's sensing chamber being filled with smoke particles. Factors like the type of smoke, environmental conditions, and the specific design of the detector can influence the exact amount needed for activation. It's essential to refer to the manufacturer's specifications for precise activation thresholds.