listening to this thing it sounds like there’s a big ass ratcheting gear mechanism counting down and triggering a relay on a stepper motor or something.its loud as hell, non continuous and I can’t tune it out. why such a design? why not a digital 555 timer circuit with the stepper motor and it’d be basically silent and last forever without mechanical wear component.
the model that’s ticking in front of me is a Hospira Plum 360 but I’ve seen others with same loudness mechanism
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The drive mech on that pump is intricate to allow precise flow and to make sure it doesn’t become occluded. Better to have a noisy mechanism that works when it’s supposed to and stops when it doesn’t
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