Measuring and testing – Volumetric content measuring
Patent
1998-04-06
1998-12-29
Raevis, Robert
Measuring and testing
Volumetric content measuring
G01F 1700
Patent
active
058544240
ABSTRACT:
For use with a wetwell having a geometrically regular upper portion and a geometrically irregular lower portion, a method is provided for estimating the volume in the lower portion. Upper and intermediate level sensors are provided in the upper portion of the wetwell, and a lower level sensor is provided in the lower portion. The volume between the intermediate and upper levels is first calculated. Then, the wetwell performs a series of cycles, each allowing the wetwell to fill with liquid between the lower level sensor and the upper level sensor while the pumping means is off or at a low rate, then causing the wetwell to be emptied from the upper level to the lower level by running the pump. During the filling part of each cycle, the time required for liquid to rise between the lower level and the intermediate level is noted, as is the time required for the liquid to rise between the intermediate level and the upper level. If these times are T.sub.2 and T.sub.1, respectively, the next step is, for each cycle, to multiply the upper volume (that between the intermediate and upper levels) by T.sub.2 /T.sub.1, thus arriving at an estimate of the lower volume between the lower level and the intermediate level. Each such calculated estimate is stored, and all estimates are averaged to provide a good approximation of the actual volume between the lower and intermediate levels.
REFERENCES:
patent: 2792708 (1957-05-01), Johnston, Jr. et al.
patent: 4455870 (1984-06-01), Jorritsma
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