Measuring and testing – Liquid level or depth gauge – Float
Patent
1974-06-10
1976-11-23
Queisser, Richard C.
Measuring and testing
Liquid level or depth gauge
Float
73319, 73DIG5, 340244A, G01F 2306, G01B 2100
Patent
active
039929418
ABSTRACT:
The level of liquid in a tank or a boiler is determined initially by enclosing the liquid in a column and then sensing the liquid surface in the column by causing a plunger to pass through the non-liquid medium in the column above the liquid to the liquid surface and noting the abrupt change in descent rate of the plunger when it hits the liquid surface due to the great difference between the viscosities of the non-liquid and liquid mediums. The level of liquid in the boiler is reflected on a continuing basis by permitting the plunger to float or levitate in or on the liquid as it is supported by an entrapped gas bubble. The difference in the position of the plunger when it encounters the liquid surface and the position of the plunger thereafter, as it is supported on the liquid is the correction factor that is maintained steadily until pressure or temperature changes necessitate a new determination of that difference with a fresh gas bubble at the current temperature and pressure. In a steam boiler, the plunger is hollow, vented at the bottom and rides in a vertical open cylinder. When the plunger is empty of water, it can "levitate" in the cylinder with the bottom of the plunger at the water level and so, the plunger level indicates water level in the boiler. A magnetic coupled plunger lifting mechanism completely external of the boiler couples magnetically to the plunger for doing the following: lifting the plunger; following the plunger position; and controlling the degree of levitation. By the magnetic coupling, magnetic forces pass between the plunger to an exterior rod and the rod initiates a display of plunger position.
REFERENCES:
patent: 1617287 (1927-02-01), Huggins
patent: 2182469 (1939-12-01), Davis
patent: 2771774 (1956-11-01), Fornasieri
patent: 3114478 (1963-12-01), Hilkemeier et al.
patent: 3707940 (1973-01-01), Sherrick et al.
patent: 3710613 (1973-01-01), Innes et al.
patent: 3815416 (1974-06-01), Portis
Appleman John S.
Dunn Robert T.
Queisser Richard C.
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