# US 2014/0190825 A1 · pH Sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190825 A1 - Document ID: US20140190825A1 - Status: Published application - Kind: A1 - Application number: 14/045,526 - Filed: 2013-10-03 - Published: 2014-07-10 - 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/US20140190825A1 ## 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 at position 1 -43. (canceled) ### Claim 44 A pH sensor comprising a sensing electrode of a bare metal having an electroactive surface sealed within a tube comprising a copolymer of tetrafluoroethylene such as to provide a barrier for the signal electrode to oxygen and anions from the environment exterior to the tube except as may pass through the tube and a gel-filled reference electrode. ### Claim 45 (depends on 44) The pH sensor of claim 44 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 46 (depends on 44) The pH sensor of claim 44 wherein the sensing electrode is a rod of high purity metal consisting of antimony/antimony oxide or bismuth/bismuth oxide. ### Claim 47 (depends on 46) The pH sensor of claim 46 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 48 (depends on 46) The pH sensor of claim 46 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 49 (depends on 48) The pH sensor of claim 48 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 50 (depends on 46) The pH sensor of claim 46 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 51 (depends on 50) The pH sensor of claim 50 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 52 (depends on 44) The pH sensor of claim 44 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 53 (depends on 52) The pH sensor of claim 52 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 54 (depends on 52) The pH sensor of claim 52 wherein the electrolytic gel is a gelled solution saturated with sodium chloride and further saturated with silver chloride. ### Claim 55 (depends on 44) The pH sensor of claim 44 further comprising a temperature sensitive element in proximity to the signal 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 56 (depends on 55) The pH sensor of claim 55 wherein the temperature sensitive element is a thermistor in a resin sealant. ### Claim 57 (depends on 55) The pH sensor of claim 55 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 58 (depends on 57) The pH sensor of claim 57 wherein the device comprises a voltage amplifier and wherein an electrical output from the temperature sensitive element is provided to the voltage amplifier. ### Claim 59 (depends on 58) The pH sensor of claim 58 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 60 (depends on 59) The pH sensor of claim 59 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 61 (depends on 60) The pH sensor of claim 60 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 62 (depends on 44) The pH sensor of claim 44 wherein the tube comprises a copolymer of tetrafluoroethylene and perfluoro-3,6-dioxa-4-methyl-7-octene-sulfonic acid.