Automated smart water quality monitor and analyzer and associated methods

• US 10,436,749 B2
• Filed: 05/11/2018
• Issued: 10/08/2019
• 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 S
• Application Number:
  US15/977,806
• Publication Number:
  US 20190025252A1
• Time in Patent Office: 515 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 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 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, 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, wherein the wire feed system is positioned in an electrode module configured to be removable from the housing, and 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;

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

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 to 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.

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 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.

5. The system of claim 4, comprising a motor configured to rotate the collecting spool, wherein the motor is controlled by the control system.

6. The system of claim 1, further comprising 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.

7. The system of claim 6, 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.