A manufacturer of automated countertop and wall-mounted soap and hand sanitizer dispensers, which work by sensing the presence of a hand to activate a motor and gear drive mechanism to pump out a small amount of liquid cleanser, was concerned about the noise made by these units. Acentech carried out a series of projects aimed at determining and characterizing the main sources and mechanisms of radiated noise, evaluating how effective various alternate designs could be at generating less noise, and quantifying how the units compared to others in the marketplace. The end-goal was to gain a better understanding of the primary sources of noise in this manufacturer’s line of touch-free dispensers, and to use that knowledge to come up with recommendations for design changes that can

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