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In a previous life, I worked with chemical feed system in the paper industry, and we did a lot of work with tank level sensing, various sized tanks, some smaller but most from around 150 gallons up to around 3,000 gallons. It's been more than 10 years so no doubt tech has advanced, but back then the ultrasonics had issues and we didn't use them a lot. If I recall correctly (and my memory is a bit fuzzy on the subject), one issue was that they worked best with a greater distance looking down to the liquid than we had to work with. Some of our tanks had agitation, & I think other issues were difficulty with that agitation and foaming. At that time the things were improving and looking good though.
Anyway, I am certainly not sure, but I'm thinking that ultrasonics might have issue with the small tank dimensions that we are talking about here....
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