Water detector means for tank liquid level measuring system

摘要

A float valve on the bottom of a submerged purging tube in a liquid storage tank detects water in the bottom of the tank below a liquid therein of a lesser specific gravity. When such water or other heavier liquid is detected by the float valve, the purging orifice leading to the purging tube is closed and further pressurizing of the purging tube will result in an associated gage registering the presence of water in the tank.