Liquid level system

Details Liquid level system Liquid level system

G - Physics

01

F

73/10

G01F 23/14 (2006.01)

Patent

CA 1176867

V. N. Lawford - R. Austin 15-8 LIQUID LEVEL SYSTEM ABSTRACT OF THE DISCLOSURE A liquid level system employs a pair of vertically spaced sensors in a tank such as a boiler. Each sensor includes a pair of bellows. The first bellows is enclosed by a protective enclosure while the second bellows is exposed to the interior of the tank. The first bellows of the two sensors are interconnected and filled with a liquid forming substance, such as an alkali metal, which is in liquid phase at high temperatures, while the second bellows of each sensor and the enclosure for the first bellows are interconnected and filled with a second liquid-forming substance, such as a metal alloy, which is essentially inert. A transducer is connected to one of the second bellows which produces an electrical output signal proportional to the difference between the pressures at the locations of the second bellows and, thus, the level of liquid in the tank.

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