Hall-cell liquid level detector

摘要: A liquid level detector "stick" includes a column of Hall-cells adapted to be mounted vertically in liquid's containing tank. One or more toroidal magnets are slidably fitted about the stick. float elevates topmost magnet liquids If comprise two immiscible parts, second may floated at surface denser part. very low power electronic system continuously scans and determines which particular one ones them adjacent magnet. This used gasoline station storage tank that also contain water, providing accurate measure both liquids. It is capable operating monitor mode for sounding an alarm when change either part occurs indicate leakage into from attempted theft.