Method and apparatus for enhanced detection of a specie using a gas chromatograph

• US 7,013,707 B2
• Filed: 01/16/2003
• Issued: 03/21/2006
• Est. Priority Date: 11/19/1999
• Status: Expired due to Fees

• Current Assignee: PerkinElmer LAS, Inc. (Perkinelmer Incorporated)
• Original Assignee: PerkinElmer LAS, Inc. (Perkinelmer Incorporated)
• Inventors: Dalmia, Avinash, Prohaska, Otto J., Tipler, Andrew
• Primary Examiner(s): LARKIN, DANIEL SEAN
• Application Number:
  US10/345,608
• Publication Number:
  US 20030164312A1
• Time in Patent Office: 1,160 Days
• Field of Search: 73/233.5, 73/234, 73/234.1, 204/421, 204/424, 204/426, 204/431, 422/83, 422/89, 422/98, 422/99, 436/161, 205/783.5
• US Class Current: 73/23.4
• CPC Class Codes: G01N 2030/025 Gas chromatography
• CPC Class Codes: G01N 2030/125 pyrolising
• CPC Class Codes: G01N 2030/645 electrical conductivity detectors
• CPC Class Codes: G01N 27/4045 for gases other than oxygen
• CPC Class Codes: G01N 30/62 Detectors specially adapted therefor
• CPC Class Codes: G01N 30/64 Electrical detectors

Abstract

The invention includes a method and apparatus for a chromatography system having a chromatographic column for separating gases in a mixture from one another and an electrochemical gas sensor coupled to the chromatographic column for detecting a gas being emitted from the column. The electrochemical gas sensor further includes a substrate having a surface for depositing electrodes thereon, an ionomer membrane in contact with the surface, an electrode in contact with the surface, and an opening in the ionomer membrane in a location proximate to the electrode for permitting a gas to diffuse through the opening to simultaneously contact the electrode and the ionomer membrane within the opening.

Claims

1. A chromatography system, comprising:

a chromatographic column for separating gases in a mixture from one another; and

an electrochemical gas sensor coupled to said chromatographic column for detecting a gas;

said electrochemical gas sensor further including;

a substrate having a surface for depositing electrodes thereon;

an ionomer membrane in contact with said surface and having a first outermost surface and a second outermost surface;

an electrode in contact with said surface of said substrate; and

an opening extending from said first outermost surface to said second outermost surface in a location proximate to said electrode for permitting a gas to diffuse through said opening to simultaneously contact said electrode and said ionomer membrane within said opening.

2. The chromatography system of claim 1, further comprising a reactor placed between and coupled to both said chromatographic column and said electrochemical gas sensor for oxidizing the gas.

3. The chromatography system of claim 1, wherein said opening extends from said first outermost surface to said second outermost surface of said ionomer membrane for defining walls to guide the gas to said electrode.

4. The chromatography system of claim 1, further comprising a housing for containing said substrate, said ionomer membrane, and said electrode.

5. The chromatography system of claim 4, said housing includes a gas diffusion passage in a location proximate to said electrode and having fluid connection with said opening.

6. The chromatography system of claim 5, wherein said gas diffusion passage is angled in alignment with said opening.

7. The chromatography system of claim 5, wherein said gas diffusion passage is misaligned with said opening.

8. The chromatography system according to claim 1, wherein said substrate further includes at least one hole extending from a first surface to a second surface for permitting moisture to diffuse through said at least one hole to contact said ionomer membrane.

9. The electrochemical gas sensor according to claim 8, further comprising a reservoir for containing moisture to moisten said ionomer membrane.

10. The electrochemical gas sensor according to claim 9, wherein said reservoir is located adjacent to said substrate.

11. The electrochemical gas sensor according to claim 9, wherein said reservoir is located on a side of said substrate opposite said ionomer membrane.

12. The electrochemical gas sensor according to claim 8, said at least one hole further comprising moisture, said moisture being diffused from said reservoir to said ionomer membrane.

13. The electrochemical gas sensor according to claim 9, further comprising a wicking material in contact with said second surface for drawing moisture from said reservoir toward said substrate.

14. The electrochemical gas sensor according to claim 13, wherein said wicking material is located in said at least one hole of said substrate.

15. The electrochemical gas sensor according to claim 13, wherein said reservoir is spaced apart from said second surface and said wicking material is between said second surface and said reservoir.

16. The electrochemical gas sensor according to claim 1, wherein said substrate is a foil.