Continuous measurement of the absolute conductivity of a liquid
September 21, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2842736 3731187 3848187 3879657 Cell for measuring electrical resistivity of a liquid Battery electrolyte level sensor Self alarming five single electrodes conductivity cell Self alarming four double electrodes conductivity cell Dielectric methods and apparatus for in situ prediction of porosity and specific surface area (i.e., soil type) and for detection of hydrocarbons, hazardous waste materials, and the degree of melting of ice and to predict in situ stress-strain behavior Pure water conductivity sensor InventorsAssigneeApplicationNo. 410772 filed on 09/21/1989US Classes:324/449, With axially arranged electrodes324/444Which includes current and voltage electrodesExaminersPrimary: Wieder, Kenneth A.Assistant: Regan, Maura K. Attorney, Agent or FirmInternational ClassG01N 027/02AbstractA method and apparatus for measuring the electrical conductivity of a liquid comprises an electrically insulating housing through which the liquid flows, and four electrodes inserted into the path of the liquid flowing through the housing. The first and third electrodes are current electrodes and the second and fourth electrodes are voltage electrodes. An AC current is injected into the first current electrode and exits at the second current electrode, with the resulting AC voltage across the voltage electrodes being measured. The first current electrode is driven to maintain a constant value of AC voltage on the voltage electrodes while measuring the current flow in the second current electrode which is representative of the electrical conductivity of the liquid. A DC bias voltage source is provided and is coupled to each of the electrodes by a resistor and a capacitor to prevent coating or plating of the electrodes. The method and apparatus permit continuous monitoring of the absolute conductivity of a liquid. | |
