Methods and systems for analyzing a liquid medium

• US 9,841,382 B2
• Filed: 04/29/2016
• Issued: 12/12/2017
• Est. Priority Date: 03/08/2013
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Walicki, Robert S.
• Primary Examiner(s): ELAHI, SHAN E
• Application Number:
  US15/142,605
• Publication Number:
  US 20160238539A1
• Time in Patent Office: 592 Days
• Field of Search: 348135
• CPC Class Codes: G01N 2021/752 Devices comprising reaction zones
• CPC Class Codes: G01N 2021/7759 Dipstick; Test strip
• CPC Class Codes: G01N 21/78 producing a change of colour
• CPC Class Codes: G01N 21/8483 Investigating reagent band test-element handling not specific to a test method G01N33/4875; analytical elements specific to chemical analysis of biological material G01N33/52; autometer with reagent band G01N35/04
• CPC Class Codes: G01N 31/22 using chemical indicators G01N31/02 takes precedence
• CPC Class Codes: G01N 33/18 Water

Abstract

Methods and systems for colorimetrically analyzing a liquid medium by analyzing chemical test strip images are provided. The liquid medium can be industrial water in an industrial water system. Image analyzing software carries out the analysis. The results of the analysis can be used to diagnosing a chemical treatment regimen of the industrial water system. A chemical test strip holder can be used to enhance reliability and repeatability of the imaging process and/or subsequent analysis.

Claims

1. A method of determining concentration of a chemical species in industrial cooling water, the method comprising:

exposing a reactive zone of a chemical test strip to industrial cooling water thereby creating a post-exposure reactive zone;

imaging the post-exposure reactive zone using an imaging device thereby creating a digital image of the post-exposure reactive zone;

optionally cropping the digital image of the post-exposure reactive zone to isolate a portion of the digital image for analysis;

analyzing a colorimetric parameter of at least the portion of the digital image of the post-exposure reactive zone using image analyzing software to determine the concentration of the chemical species; and

optionally outputting the determined concentration of the chemical species of the industrial cooling water.

2. The method of claim 1, further comprising illuminating the chemical test strip from the rear during the imaging of the post-exposure reactive zone.

3. The method of claim 1, further comprising taking action based on the determined concentration.

4. The method of claim 3, wherein the action taken is modification of a chemical treatment regimen, the modification selected from changing an injection rate of a treatment chemical, implementing chemical treatment, and combinations thereof.

5. The method of claim 4, further comprising illuminating the chemical test strip from the rear during the imaging of the post-exposure reactive zone.

6. The method of claim 4, wherein the modification is changing an injection rate of a treatment chemical.

7. The method of claim 6, further comprising illuminating the chemical test strip from the rear during the imaging of the post-exposure reactive zone.

8. The method of claim 3, wherein the action taken is an operational action selected from changing a set point related to a controlled, process-related physical parameter, operating process-related equipment, re-sourcing makeup water, and combinations thereof.

9. The method of claim 8, further comprising illuminating the chemical test strip from the rear during the imaging of the post-exposure reactive zone.

10. The method of claim 1, further comprising automatically recommending a plan of action to maintain efficient operation of an industrial cooling water system based on the analysis of the digital image of the post-exposure reactive zone.

11. The method of claim 10, wherein the plan of action includes at least one of implementation and modification of a chemical treatment regimen.

12. The method of claim 1, wherein the concentration of the chemical species is determined via a color change of the post-exposure reactive zone.

13. The method of claim 1, wherein the concentration of the chemical species is determined via a plurality of post-exposure reactive zones on the chemical test strip.

14. The method of claim 1, wherein the colorimetric parameter is selected from tint, color value, color intensity, brightness, contrast, and combinations thereof.

15. The method of claim 1, further comprising using a chemical test strip holder to hold the chemical test strip during the imaging of the post-exposure reactive zone.

16. The method of claim 1, wherein the chemical species is selected from calcium, magnesium, total hardness, acidity, chloride, sulfate, ortho-phosphate, alkalinity, p-alkalinity, corrosion inhibitor, dispersant polymer, biocide, and combinations thereof.

17. The method of claim 16, further comprising illuminating the chemical test strip from the rear during the imaging of the post-exposure reactive zone.

18. The method of claim 1, wherein the chemical species is selected from calcium, magnesium, total hardness, acidity, chloride, sulfate, and combinations thereof.

19. The method of claim 1, wherein the chemical species is a corrosion inhibitor.

20. The method of claim 19, wherein the corrosion inhibitor is an aromatic azole.