Automated smart water quality monitor and analyzer and associated methods

• US 9,970,899 B2
• Filed: 07/13/2017
• Issued: 05/15/2018
• Est. Priority Date: 07/15/2016
• Status: Active Grant

• Current Assignee: Ketos, Inc.
• Original Assignee: Ketos, Inc.
• Inventors: Sankaran, Meena, Ali, Mazhar N., Mehta, Harish
• Primary Examiner(s): NOGUEROLA, ALEXANDER STEPHAN
• Application Number:
  US15/649,379
• Publication Number:
  US 20180017526A1
• Time in Patent Office: 306 Days
• CPC Class Codes: G01N 15/0656 using electric, e.g. electrostatic methods or magnetic methods by investigating individual particles G01N15/1031, G01N15/12
• CPC Class Codes: G01N 2015/0053 in liquids, e.g. trouble
• CPC Class Codes: G01N 27/333 Ion-selective electrodes or membranes glass electrodes G01N27/36
• CPC Class Codes: G01N 27/403 Cells and electrode assemblies
• CPC Class Codes: G01N 27/416 Systems G01N27/27 takes precedence
• CPC Class Codes: G01N 27/48 using polarography, i.e. measuring changes in current under a slowly-varying voltage
• CPC Class Codes: G01N 33/18 Water

Abstract

A fluid testing system can be used to measure the levels of contaminants in a fluid system. The system can utilize anodic stripping voltammetry or some other chemical, electrical, or electrochemical process to measure the contaminant levels. Wire electrodes may be used to facilitate the tests. Unused portions of the electrode wires can be fed into the test chambers between tests to ensure clean and reliable electrodes for subsequent testing.

Claims

1. A fluid testing system that performs a plurality of test cycles on fluid comprising:

a housing having inlet that attaches to a fluid line and an outlet that attaches to the fluid line;

at least one testing chamber in the housing that receive fluid from the inlet of the housing;

a fluid movement assembly that selectively directs fluid from the inlet into the at least one testing chamber;

a wire feed system that provides first and second electrodes to the at least one testing chamber, wherein the wire feed system includes a length of first and second electrodes wires and wherein the wire feed system provides a new portion of the length of the first and second electrodes for each test cycle;

a reference sample supply system that supplies reference samples to the at least one testing chamber;

a control system that controls the fluid movement assembly, the wire feed assembly and the reference sample supply system such that for each test cycle, the at least one testing chamber is filled with fluid and a new portion of the first and second electrodes are positioned into the at least one testing chamber, and wherein the control system applies an electric signal the electrodes and samples the results so as to determine the presence of selected contaminants in the fluid in the at least one testing chamber; and

a third electrode, wherein the first electrode is a working electrode, the second electrode is a counter electrode, and the third electrode is a reference electrode;

wherein the control system is configured to apply a positive voltage from the counter electrode to the working electrode, then to apply a negative voltage from the counter electrode to the working electrode, then to transition from the negative voltage back to the positive voltage, wherein the control system measures current and voltage relative to the reference electrode to determine an amount of at least one selected contaminant in the fluid in the testing chamber.

2. The system of claim 1, wherein the control system for each testing cycle induces the delivery of the fluid to be tested, performs a first measurement by application of an electric signal to the first electrode, determines a first measurement indicative of the presence of a selected contaminant in at least one testing chamber by evaluating a signal received on a second electrode in response to the electric signal, then induces the supply of a known quantity of the selected contaminant to the at least one testing chamber and performs a second measurement by application of the electric signal to the first electrode and determines a second measurement indicative of the presence of the selected contaminant on the signal received on the second electrode in the at least one testing chamber.

3. The system of claim 2, wherein the control system determines the quantity of contaminant present in the at least one testing chamber by determining the difference between the first and second measurements.

4. The system of claim 1, wherein the wire feed system comprises at least one supply spool positioned within the housing and around which an unused quantity of at least one of the first and second electrode wires is wrapped, the wire feed system including an electrode movement apparatus configured to move an unused portion of each of the first and second electrodes into the at least one testing chamber after each test cycle is completed.

5. The system of claim 4, wherein the electrode movement apparatus comprises a collecting spool around which a portion of at least one of the first and second electrodes is wrapped.

6. The system of claim 5, comprising a motor configured to rotate the collecting spool, wherein the motor is controlled by the control system.

7. The system of claim 4, wherein the wire feed system is positioned in an electrode module configured to be removable from the housing.

8. The system of claim 7, wherein the electrode module includes a volume of fluid having a known concentration of a selected contaminant, and wherein the electrode module is configured to output the volume of fluid into a constituent chamber in the housing separate from the electrode module when the electrode module is installed in the housing.

9. A fluid testing system that performs a plurality of test cycles on a fluid comprising:

a housing having an inlet that attaches to a fluid line and an outlet that attaches to the fluid line;

at least one testing chamber in the housing that receives fluid from the inlet of the housing;

a first electrode;

a second electrode;

a fluid supply system that supplies fluid samples to the at least one testing chamber, each fluid sample including a known concentration of at least one contaminant;

a control system that is configured to control the fluid sample supply system such that for each test cycle, the at least one testing chamber is filled with fluid, wherein the control system is configured to apply an electric signal to the first electrode and samples the results so as to determine the presence of selected contaminants in the fluid in the at least one testing chamber, wherein the control system is configured to induce the addition of a known amount of a selected contaminant to the fluid received from the inlet of the housing in the at least one testing chamber and reapplies the electric signal and re-samples the results, and wherein the results of the re-sampling are compared to the results of the sampling to determine the amount of the selected contaminant in the fluid; and

a wire feed system that provides the first and second electrodes to the at least one testing chamber, wherein the wire feed system includes a length of first and second electrodes wires and wherein the wire feed system provides a new portion of the length of the first and second electrodes for each test cycle, and wherein the control system is configured to control operation of the wire feed system.

10. The system of claim 9, comprising a wired or wireless signal generator in electrical communication with the control system, wherein the wireless signal generator generates wireless signals including the results of the sampling on the second electrode.

11. The system of claim 9, comprising a unique identifier, wherein the unique identifier is used to correlate the results sampled by the control system with the physical location of the system.

12. The system of claim 9, wherein the control system is configured to operate via remote control and/or by preset automated control.

13. A method of measuring levels of one or more contaminants in a fluid, the method comprising:

passing a test volume of fluid through an inlet of a housing into a test chamber within the housing;

adding a predetermined volume of acid to the test chamber;

introducing a first test length of a first electrode wire into the test volume;

introducing a first test length of a second electrode wire into the test volume;

introducing a first test length of third electrode wire into the test volume;

applying a positive voltage from the third electrode to the first electrode for a first period of time;

applying a negative voltage from the third electrode to the first electrode for a second period of time;

transitioning from the negative voltage back to the positive voltage over a third period of time;

measuring current and voltage in the fluid in the test chamber relative to the second electrode;

after the measuring step, adding a known quantity of fluid having a known concentration of a selected contaminant to the test chamber and then repeating the applying, transitioning, and measuring steps;

determining an amount of the selected contaminant in the test volume of fluid by comparing the measured currents and voltages from before and after the adding of the known quantity of fluid having a known concentration of the selected contaminant.

14. The method of claim 13, comprising:

moving the first test length of first electrode wire out from the test volume and moving a second test length of first electrode wire into the test volume, the second length connected to the first length;

moving the first test length of second electrode wire out from the test volume and moving a second test length of second electrode wire into the test volume, the second length connected to the first length; and

moving the first test length of third electrode wire out from the test volume and moving a second test length of third electrode wire into the test volume, the second length connected to the first length;

wherein the moving steps are performed by an electrode transition mechanism configured to selectively move the first, second, and third electrodes through the test volume.

15. The method of claim 14, wherein the determining step is performed before the moving steps.

16. The method of claim 15, wherein the step of transitioning from the negative voltage back to the positive voltage is performed using a square wave or differential wave superimposed on a linear voltage increase or stepped voltage increase.

17. The method of claim 13, wherein the first electrode is a working electrode, the second electrode is a reference electrode, and the third electrode is a counter electrode.