Detector assembly for an electromagnetic induction-type conductivity meter

• US 5,252,925 A
• Filed: 10/22/1991
• Issued: 10/12/1993
• Est. Priority Date: 10/22/1990
• Status: Expired due to Term

• Current Assignee: Horiba Limited
• Original Assignee: Horiba Limited
• Inventors: Matsumoto, Hiroo, Akiyama, Shigeyuki
• Primary Examiner(s): Wieder, Kenneth A.
• Assistant Examiner(s): BROWN, GLENN WARNER
• Application Number:
  US07/781,712
• Time in Patent Office: 721 Days
• Field of Search: 324/439, 324/445, 324/450, 324/204, 324/693, 324/724, 324/219, 324/220, 324/239
• US Class Current: 324/445
• CPC Class Codes: G01N 27/023 where the material is placed in the field of a coil
• CPC Class Codes: G01R 27/22 Measuring resistance of fluids

Abstract

An improved detector assembly with an electromagnetic induction-type conductivity meter is provided with a pair of housing members forming a first liquid sample flow path at a central location, and a second liquid sample flow path on their outer circumference. An excitation coil and a detection coil extend about the first liquid sample path, while the second liquid sample flow path interconnects with the first liquid sample flow path both upstream and downstream of the respective coils. The second liquid sample flow path can substantially extend about the coils so that a relatively large induction current can be generated and measured as representative of the liquid sample.

Claims

1. An improved detector assembly of an electromagnetic induction-type conductivity meter comprising:

a plastic material housing member having a first liquid sample flow path extending therethrough, the housing member being bifurcated into a first component and a second component, the first component having a central hollow protrusion forming a portion of the first liquid sample flow path, and the second component having a through passage with a cavity for receiving the central hollow protrusion;

an excitation coil extending about the first liquid sample flow path;

a detection coil extending about the first liquid sample flow path, and

means for providing a second liquid sample flow path that interconnects with the first liquid sample flow path both upstream and downstream of the respective coils, whereby the excitation coil enables an induction current to be generated in the liquid sample and the detection coil measures the induction current as representative of the conductivity of the liquid sample.

2. The invention of claim 1, wherein the second flow path includes a first channel and a second channel that are approximately 180 degrees apart.

3. The invention of claim 1, wherein the second flow path substantially surrounds the respective coils and the first liquid sample flow path.

4. The invention of claim 1 wherein the plastic material is selected from vinyl chloride, polypropylene, polyvinylidene fluoride, and Teflon™

.

5. The invention of claim 1, further including means for sensing the temperature of the first liquid sample flow path mounted on the housing member.

6. The invention of claim 1, wherein the central hollow protrusion is encompassed with an indent of a configuration to support the respective transformers.

7. The invention of claim 6, further including a respective hollow male coupling member on each component.

8. An improved detector assembly of an electromagnetic induction-type conductivity meter comprising:

a housing member having a first liquid sample flow path extending therethrough;

an excitation coil extending about the first liquid sample flow path;

a detection coil extending about the first liquid sample flow path, and

means for providing a second liquid sample flow path that interconnects with the first liquid sample flow path both upstream and downstream of the respective coils and substantially surrounds the respective coils and the first liquid sample flow path, the second liquid sample flow path being adjacent the coils, whereby the excitation coil enables an induction current to be generated in the liquid sample and the detection coil measures the induction current as representative of the conductivity of the liquid sample.

9. An improved detector assembly of an electromagnetic induction-type conductivity meter comprising:

a housing member having a first liquid sample flow path extending therethrough;

an excitation coil extending about the first liquid sample flow path;

a detection coil extending about the first liquid sample flow path, and

means for providing a second liquid sample flow path that interconnects with the first liquid sample flow path both upstream and downstream of the respective coils, the second liquid sample flow path being adjacent the coils and substantially surrounding the coils, whereby the excitation coil enables an induction current to be generated in the liquid sample and the detection coil measures the induction current as representative of the conductivity of the liquid sample.

10. The invention of claim 9, wherein the housing member is formed of a plastic material.

11. The invention of claim 10, wherein the housing member is bifurcated into a first component and a second component, the first component having a central hollow protrusion forming a portion of the first liquid sample flow path, and the second component having a through passage with a cavity for receiving the central protrusion.

12. The invention of claim 11, wherein the central hollow protrusion is encompassed with an indent of a configuration to support the respective coils.

13. The invention of claim 12, further including a respective hollow male coupling member on each component.

14. The invention of claim 12, wherein the plastic material is selected from vinyl chloride, polypropylene, polyvinylidene fluoride, and Teflon™

.

15. An improved detector assembly of an electromagnetic induction-type conductivity meter connectable to a pipeline, comprising:

a two-piece molded housing member unitarily connected together and having a first liquid sample flow path extending therethrough including first and second male coupling projections for connection to a pipeline;

an excitation coil extending about the first liquid sample flow path;

a detection coil extending about the first liquid sample flow path, and

means for providing a second liquid sample flow path extending through the housing member that interconnects with the first liquid sample flow path both upstream and downstream of the respective coils, the second liquid sample flow path including a first channel and a second channel that are approximately 180 degrees apart relative to the first liquid sample flow path, the second liquid sample flow path being adjacent the coils, whereby the excitation coil enables an induction current to be generated in the liquid sample and the detection coil measures the induction current as representative of the conductivity of the liquid sample.

16. The invention of claim 15 wherein the housing member is formed of a plastic material.

17. The invention of claim 15, wherein the housing member is bifurcated into a first component and a second component, the first component having a central hollow protrusion forming a portion of the first liquid sample flow path, and the second component having a through passage with a cavity for receiving the central protrusion.