Apparatus for measuring the specific gravity, weight, level, and/or volume of a liquid in a container

• US 5,157,968 A
• Filed: 02/25/1991
• Issued: 10/27/1992
• Est. Priority Date: 02/27/1990
• Status: Expired due to Term

• Current Assignee: Uri Zfira
• Original Assignee: Uri Zfira
• Inventors: Zfira, Uri
• Primary Examiner(s): Williams, Hezron E.
• Assistant Examiner(s): ROSKOS, JOSEPH
• Application Number:
  US07/659,666
• Time in Patent Office: 610 Days
• Field of Search: 73/149, 73/309, 73/319, 73/433
• US Class Current: 73/149
• CPC Class Codes: G01F 23/0038 using buoyant probes with floats G01F23/30 - G01F23/76
• CPC Class Codes: G01G 17/04 for weighing fluids, e.g. gases, pastes
• CPC Class Codes: G01N 9/20 by balancing the weight of the bodies

Abstract

Apparatus for measuring the specific gravity, weight, level, and/or volume of a liquid in a container includes two load cells supported at the upper end of the container, a first body of known cross-sectional area extending through the interior of the container supported in suspension by one load cell, and a second body of known volume extending through the interior of the container and supported in suspension by the other load cell.

Claims

1. Apparatus for measuring the specific gravity, weight, level, and/or volume of a liquid in a container of known cross-sectional area, comprising:

a first weight measuring device at the upper end of the container;

a first body, of known cross-sectional area, extending through the interior of the container with the upper end of the body supported in suspension by said first weight measuring device, and the lower end of the body clear of the container bottom;

a second weight measuring device at the upper end of the container;

and a second body, of known volume, disposed within the container and supported in suspension by said second weight measuring device and clear of the container bottom;

said second body being of a short length and disposed near the bottom of the container such that it would normally be completely submerged by the liquid in the container;

said first body being of a longer length such that it would normally be only partially submerged by the liquid in the container.

2. The apparatus according to claim 1, wherein said first body is a rod of uniform configuration.

3. The apparatus according to claim 1, wherein said first body is supported in suspension with its lower end at a small clearance from the container bottom.

4. The apparatus according to claim 1, wherein said second body is supported in suspension with its lower end at a small clearance from the container bottom.

5. The apparatus according to claim 1, wherein said first and second weight measuring devices are force transducers which convert mechanical force to electrical signals.

6. The apparatus according to claim 5, wherein said force transducers are load cells.

7. The apparatus according to claim 1, further including computer means for receiving the outputs of said first and second weight measuring devices and for computing the specific gravity, weight, level, and/or volume of the liquid in the container.

8. The apparatus according to claim 7, wherein said container includes an inlet for introducing the liquid into the container, and an outlet for removing liquid from the container;

said computer continuously computing the specific gravity, weight, level, and/or volume of the liquid in the container.

9. The apparatus according to claim 8, wherein said computer further includes a monitor for displaying the computed specific gravity, weight, level, and/or volume of the liquid in the container at any particular time.

10. Apparatus for measuring the specific gravity, weight, level, and/or volume of a liquid in a container, comprising:

first and second force transducers supported at the upper end of the container for converting mechanical force to electrical signals;

a first body, of known cross-sectional area, extending through the interior of the container with the upper end of the body supported in suspension by said first force transducer, and the lower end of the body clear of the container bottom;

and a second body, of known volume, extending through the interior of the container and supported in suspension by said second force transducer, with the lower end of the second body clear of the container bottom;

said second body being of a short length and disposed near the bottom of the container such that it would normally be completely submerged by the liquid in the container;

said first body being of a longer length such that it would normally be only partially submerged by the liquid in the container.

11. The apparatus according to claim 10, wherein said container is of known cross-sectional area.

12. The apparatus according to claim 11, wherein said first body is a rod of uniform cross-section and is supported in suspension with its lower end at a small clearance from the container bottom.

13. The apparatus according to claim 11, wherein said second body is supported in suspension from said second force transducer at a small clearance from the container bottom.

14. The apparatus according to claim 11, wherein said force transducers are load cells.

15. The apparatus according to claim 11, further including computer means for receiving the outputs of said first and second force transducers and for computing the specific gravity, weight, level, and/or volume of the liquid in the container.

16. The apparatus according to claim 15, wherein said container includes an inlet for introducing the liquid into the container, and an outlet for removing liquid from the container, said computer continuously computing the specific gravity, weight, level, and/or volume of the liquid in the container at any particular instant.

17. The apparatus according to claim 16, wherein said computer further includes a monitor for displaying the computed specific gravity, weight, level, and/or volume of the liquid in the container at any particular instant.