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Touch sensor output bouncing8/24/2023 Cross section view of the three categories of surface wetness : a) Dry, b) Droplet, c) Stream.Ī water tolerant design needs to operate normally when the surface is covered with droplets. When liquid is sprayed or splashed onto a dry surface, surface tension causes the liquid to bead up, forming droplets.įigure 1. In the following discussion, surface wetness is classified into three categories: Dry, Droplet, and Stream, as shown in Figure 1 below. Comparing the two approaches for reacting to a spill of hot liquid, the water tolerant design is the safer and smarter choice.Ĭlassifying the degree of surface wetness The water tolerant design leads to a system that turns itself off with a major spill. If the liquid is too hot to touch, the burner stays on, and the pot keeps boiling, only making the situation worse. To turn off the burner, the user of a waterproof system needs to touch the sensor through a coating of hot liquid. In contrast, a waterproof design will continue normal operation after the spill. The safest response to such an event is to turn off the burner until the spill can be cleaned up.
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