Adiabatic reducing pressure transducer, system and method

Patent metadata

Field	Value
Publication number	US-11927498-B2
Application number	US-202117521986-A
Country	US
Kind code	B2
Filing date	Nov 9, 2021
Priority date	May 24, 2018
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

Disclosed is a pressure transducer including a body made of a material having a first coefficient of thermal expansion, a fluidic inlet and a fluidic cavity enclosed by the body in fluidic communication with the fluidic inlet. The pressure transducer further includes a strain gauge including a resistive element in operable contact with the body. At least a portion of the resistive element made of a material having a second coefficient of thermal expansion that is different from the first coefficient of thermal expansion of the body. Disclosed further is a pressure transducer including a filler body located in a fluidic cavity of the pressure transducer configured to reduce adiabatic thermal effects on a transducer body. Disclosed are systems and methods incorporating the pressure transducers described herein.

First claim

What is claimed is:

1. A pressure transducer comprising:
a transducer body having a fluidic inlet, and a fluidic cavity in fluidic communication with the fluidic inlet and enclosed by the transducer body;
a strain gauge attached to the transducer body; and
a filler body located in the fluidic cavity configured to reduce adiabatic thermal effects on the transducer body.

2. The pressure transducer of claim 1 , wherein the filler body reduces the cross sectional area of the fluidic cavity to a reduced cross sectional area that is greater than or equal to an inlet cross sectional area at the fluidic inlet.

3. The pressure transducer of claim 1 , wherein the filler body comprises the same material as the transducer body.

4. The pressure transducer of claim 1 , wherein the filler body comprises a material that is different from a material of the transducer body.

5. The pressure transducer of claim 1 , wherein the pressure transducer is a flow through pressure transducer.

6. The pressure transducer of claim 5 , wherein the filler body is a cylindrical body having a diameter less than a diameter of the fluidic cavity and located in the fluidic cavity distal to the strain gauge.

7. The pressure transducer of claim 5 , wherein the filler body is a tubular body having a diameter less than a diameter of the fluidic cavity and located in the middle of the fluidic cavity.

8. The pressure transducer of claim 5 , wherein the filler body extends a substantial length of the fluidic cavity.

9. The pressure transducer of claim 1 , wherein the pressure transducer is a dead-end pressure transducer.

10. The pressure transducer of claim 1 , wherein the pressure transducer is a diaphragm pressure transducer.

11. The pressure transducer of claim 1 , wherein the filler body does not contact a sensing region of an inner surface of the fluidic cavity, the sensing region located directly below the strain gauge within the filler cavity.

12. A method comprising:
providing a pressure transducer having a fluidic inlet, and a fluidic cavity in fluidic communication with the fluidic inlet and enclosed by the transducer body;
attaching a strain gauge to the transducer body;
integrating a filler body within the fluidic cavity; and
reducing a volume of the fluidic cavity with the filler body.

13. The method of claim 12 , further comprising reducing adiabatic thermal effects on the transducer body with the filler body relative to a second pressure transducer having the same properties as the pressure transducer other than the second pressure transducer fabricated without the filler body.

14. The method of claim 12 , wherein the pressure transducer is a flow through pressure transducer and wherein the filler body extends along a length of the fluidic cavity having a cavity cross sectional area, the method further comprising:
reducing the cavity cross sectional area to a reduced cross sectional area along the length with the filler body, wherein the reduced cross sectional area is greater than or equal to an inlet cross sectional area at the fluidic inlet.

15. The method of claim 12 , wherein the integrating the filler body within the fluid cavity further comprises not contacting a sensing region of an inner surface of the fluidic cavity with the filler body, the sensing region located directly below the strain gauge within the filler cavity.

16. A liquid chromatography system comprising:
a solvent delivery system;
a sample delivery system in fluidic communication with the solvent delivery system;
a liquid chromatography column located downstream from the solvent delivery system and the sample delivery system;
a detector located downstream from the liquid chromatography column; and
the pressure transducer of claim 1 .

17. The liquid chromatography system of claim 16 , wherein the filler body reduces the cross sectional area of the fluidic cavity to a reduced cross sectional area that is greater than or equal to an inlet cross sectional area at the fluidic inlet.

18. The liquid chromatography system of claim 16 , wherein the filler body comprises the same material as the transducer body.

19. The liquid chromatography system of claim 16 , wherein the filler body comprises a material that is different from a material of the transducer body.

20. The liquid chromatography system of claim 16 , wherein the pressure transducer is a flow through pressure transducer.

Assignees

• Waters Technologies Corp

Inventors

• Bertone Gary W
• Castagna Taylor J
• Dumas Robert J

Classifications

• G01L19/0618

  Overload protection · CPC title

• G01L9/04 Primary

  of resistance-strain gauges · CPC title

• G01L9/0051

  using variations in ohmic resistance · CPC title

• G01L19/04 Primary

  Means for compensating for effects of changes of temperature {, i.e. other than electric compensation} · CPC title

• G01N30/32

  of pressure or speed (G01N30/36 takes precedence) · CPC title