# US 9,005,416 B2 · pH sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,005,416 B2 - Document ID: US9005416B2 - Status: Granted - Kind: B2 - Application number: 14/298,417 - Filed: 2014-06-06 - Published: 2014-10-09 - Granted: 2015-04-14 - Earliest claimed: 2011-03-18 - Assignees: Digital Concepts of Missouri, Inc. - Applicants: Digital Concepts of Missouri, Inc. - Inventors: Michael D. Mosley; Paul Decker - Web page: https://patentgrep.com/patent/US9005416B2 ## CPC - G01N 27/302: {pH sensitive, e.g. quinhydron, antimony or hydrogen electrodes (ion selective electrodes G01N27/333, glass electrodes G01N27/36)} - G01N 27/301: {Reference electrodes} - G01N 27/404: Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid {, e.g. Clark-type oxygen sensors} - G01N 27/4167: {pH (electrodes therefor G01N27/302, G01N27/36)} - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract Improvements in references electrodes, halogen sensors, pH sensors, TDS sensors, combinations thereof, and related methods. ## Claims ### Claim 1 A pH sensor comprising: (i) a gel-filled reference electrode; and (ii) a sensing electrode of antimony/antimony oxide or bismuth/bismuth oxide having an electroactive surface sealed within a tube comprising a cation exchange polymer that provides a barrier for the sensing electrode to both oxygen and anions from the environment exterior to the tube. ### Claim 2 (depends on 1) The pH sensor of claim 1 further comprising a base material in which one end of the tube is sealed in the base material and an electrically insulative housing supporting the base material. ### Claim 3 (depends on 1) The pH sensor of claim 1 wherein the sensing electrode is a rod of high purity metal of antimony/antimony oxide. ### Claim 4 (depends on 3) The pH sensor of claim 3 further comprising a base material in which one end of the tube is sealed in the base material and an electrically insulative housing supporting the base material. ### Claim 5 (depends on 1) The pH sensor of claim 1 wherein the sensing electrode is a rod of high purity bismuth/bismuth oxide wherein the purity of the metal is at least 99.999%. ### Claim 6 (depends on 5) The pH sensor of claim 5 further comprising a base material in which one end of the tube is sealed in the base material and an electrically insulative housing supporting the base material. ### Claim 7 (depends on 3) The pH sensor of claim 3 wherein the rod of high purity antimony/antimony oxide has a diameter of 0.375 to 0.625 inches and a length of 0.5 to 0.75 inches. ### Claim 8 (depends on 7) The pH sensor of claim 7 further comprising a base material in which one end of the tube is sealed in the base material and an electrically insulative housing supporting the base material. ### Claim 9 (depends on 1) The pH sensor of claim 1 wherein the reference electrode comprises an electrode in contact with an electrolytic gel wherein the electrode and gel are enclosed within a non-conductive, waterproof container having a water-porous but not gel-porous, ion exchange interface. ### Claim 10 (depends on 9) The pH sensor of claim 9 wherein the reference electrode is comprised of silver metal coated with silver chloride, and wherein the purity of the silver metal is at least about 99.99% by weight. ### Claim 11 (depends on 9) The pH sensor of claim 9 wherein the electrolytic gel is a gelled solution saturated with sodium chloride and further saturated with silver chloride. ### Claim 12 (depends on 1) The pH sensor of claim 1 further comprising a temperature sensitive element in proximity to the sensing electrode and reference electrode such that the temperature sensitive element provides an indication of temperature corresponding to a temperature of the sensing electrode and the reference electrode. ### Claim 13 (depends on 12) The pH sensor of claim 12 wherein the temperature sensitive element is a thermistor in a resin sealant. ### Claim 14 (depends on 12) The pH sensor of claim 12 further comprising a device connected to the sensing electrode and the reference electrode for monitoring the pH in an aquatic environment and for controlling pH in an aquatic environment. ### Claim 15 (depends on 14) The pH sensor of claim 14 wherein the device comprises a voltage amplifier and wherein an electrical output from the temperature sensitive element is provided to the voltage amplifier. ### Claim 16 (depends on 15) The pH sensor of claim 15 further comprising a conversion unit for translating outputs from the voltage amplifier into a pH indication and a water temperature indication and a display unit for displaying the indications wherein the pH indication is determined as a function of the water temperature indication. ### Claim 17 (depends on 16) The pH sensor of claim 16 further comprising a dispensing unit responsive to the device for dispensing a pH-adjustment chemical that supplies the aquatic environment with the pH-adjustment chemical. ### Claim 18 (depends on 17) The pH sensor of claim 17 further comprising a computer interface for inputting into the conversion unit at least one of (1) adjustments for controlling the dispensing unit and (2) a desired setting for controlling the dispensing unit. ### Claim 19 (depends on 1) The pH sensor of claim 1 wherein the tube comprises a copolymer of tetrafluoroethylene and perfluoro-3,6-dioxa-4-methyl-7-octene-sulfonic acid.