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The tank overfill sensors we usually see are essentially floats that actuate some kind of switch or "detector" that sends the overfill alarm. Dozens of companies in the US and abroad manufacture these units, and they're quite simple and effective. Additionally, we usually see them set up such that they alarm before overfilling of a tank occurs. There may be a sensor in an overflow conduit that will send an alarm when overflow actually occurs, but we usually like to preventoverflow.

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Q: What is it that sends an alarm when water overflows in a tank?
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