PRESSURE-SENSOR BASED LIQUID-LEVEL MEASURING DEVICE WITH REDUCED CAPILLARY EFFECT
First Claim
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1. A device for sensing or monitoring a level of a liquid within a container, the device comprising:
- a pressure sensor body comprising a sensing element; and
a hollow tube comprising;
a first end having a substantially air-tight connection to the pressure sensor body;
a second end opposite the first end;
a narrow portion extending from the first end and having a first inside diameter;
a wide portion extending from the second end and having a second inside diameter greater than the first inside diameter;
a transition portion connecting the narrow portion and the wide portion; and
an inner column defined within the hollow tube, the inner column being in fluid communication with the sensing element and extending from the first end to the second end,such that while the second end of the hollow tube is immersed in the liquid, a portion of the liquid extends into the inner column up to a column liquid level, a change in the column liquid level causing a corresponding change in pressure to a substantially constant mass of gas contained within the inner column, the change in pressure being measurable by the sensing element and directly related to the level of the liquid in the container.
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Accused Products
Abstract
A high efficiency diametrically compact, radial oriented piston hydraulic machine includes a cylinder block with a plurality of cylinders coupled to a first port by a first valve and to a second port by a second valve. A drive shaft with an eccentric cam, is rotatably received in the cylinder block and a cam bearing extend around the eccentric cam. A separate piston is slideably received in each cylinder. A piston rod is coupled at one end to the piston and a curved shoe at the other end abuts the cam bearing. The curved shoe distributes force from the piston rod onto a relatively large area of the cam bearing and a retaining ring holds each shoe against the cam bearing. The cylinder block has opposing ends with a side surface there between through which every cylinder opens. A band engages the side surface closing the openings of the cylinders.
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Citations
20 Claims
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1. A device for sensing or monitoring a level of a liquid within a container, the device comprising:
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a pressure sensor body comprising a sensing element; and a hollow tube comprising; a first end having a substantially air-tight connection to the pressure sensor body; a second end opposite the first end; a narrow portion extending from the first end and having a first inside diameter; a wide portion extending from the second end and having a second inside diameter greater than the first inside diameter; a transition portion connecting the narrow portion and the wide portion; and an inner column defined within the hollow tube, the inner column being in fluid communication with the sensing element and extending from the first end to the second end, such that while the second end of the hollow tube is immersed in the liquid, a portion of the liquid extends into the inner column up to a column liquid level, a change in the column liquid level causing a corresponding change in pressure to a substantially constant mass of gas contained within the inner column, the change in pressure being measurable by the sensing element and directly related to the level of the liquid in the container. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A device for sensing or monitoring a level of a liquid within a container, the device comprising:
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a pressure sensor body comprising a sensing element; and a hollow tube of a chemically inert material substantially impervious to air, the hollow tube defining a tube length, the hollow tube comprising; a first end having a substantially air-tight connection to the pressure sensor body; a second end opposite the first end; an essentially cylindrical narrow portion extending from the first end and having a first inside diameter; an essentially cylindrical wide portion extending from the second end and having a first length and a second inside diameter, such that the ratio of the second inside diameter to the first inside diameter is from about 4;
1 to about 10;
1;a transition portion connecting the narrow portion and the wide portion and having a second length, such that the ratio of the sum of the second length and the first length to the first length is from about 1.2;
1 to about 1.6;
1 and the ratio of the sum of the second length and the first length to the tube length is from about 1;
5 to about 1;
15, the transition portion having a bell shape characterized a smooth upward curve and a smooth inward curve, the curves both having equal angles of curvature of from about 30°
to about 60°
; andan inner column defined within the hollow tube, the inner column being in fluid communication with the sensing element and extending from the first end to the second end, such that while the second end of the hollow tube is immersed in the liquid, a portion of the liquid extends into the inner column up to a column liquid level, a change in the column liquid level causing a corresponding change in pressure to a substantially constant mass of gas contained within the inner column, the change in pressure being measurable by the sensing element and directly related to the level of the liquid in the container.
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Specification
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Current AssigneeDIBA Industries Incorporated (Halma PLC)
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Original AssigneeDIBA Industries Incorporated (Halma PLC)
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InventorsCronin, John, Helstern, Gary C., Kacur, Seth, Jahic, Merima
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Application NumberUS13/319,794Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current73/299CPC Class CodesG01F 23/164 using a diaphragm, bellow a...
