Orion Research, Inc.

Loren Somes

Steven J West

Thomas Paquette

Laura Brockway

James Barbookles

Paul Sydlowski

Jeffrey S Cohen

Chin-I Shyr

Christopher McIntre

Timothy C Gillette

Jeffrey S Hovis

Stefan Hrabosky

Robert Caporiccio

Peter F Bronk

The accuracy and temperature-independence of ion-selective electrode meters having a logarithm resistance temperature correction incorporated therein is enhanced by using a microprocessor controlled and measured circuit with switched reference and switched capacitor filter, and by adding a linear membrane resistance term to the algorithm to improve accuracy across a wide temperature range.

Ion measurement apparatus and methods for improving the accuracy thereof

The present invention comprises an electrochemical metering apparatus that provides for convenient storage and presentation of the analytical electrode, simple assembly, and two calibration modes. The apparatus includes an electrode storage and presentation assembly that permits the user to introduce the electrode into a sample solution while simultaneously observing the meter's output, and store the electrode when not in use. All structural components are intended to fit together with interlocking tabs and windows. A serial port fits within the construction of the main housing without the need for bolts, and battery clips that depend directly from the circuit board obviate the need for wiring connections. The present invention also features two calibration modes. A 'segment addition' mode permits separation of the voltage/concentration curve into individually plotted regions, the number of which depends on the number of reference solutions used in the calibration procedure. The segment corresponding most closely to the measured potential of a sample solution is used to calculate concentration. In an alternative calibration mode, one or more reference solutions are used to establish metered voltage/concentration combinations that are compared with expected, known values. Any discrepancies therebetween furnish a 'noise level' value associated with the apparatus that can be used to more precisely define the orientation of the voltage/concentration curve.

pH and concentration meter

The present invention comprises an electrochemical metering apparatus that provides for convenient storage and presentation of the analytical electrode, simple assembly, and two calibration modes. The apparatus includes an electrode storage and presentation assembly that permits the user to introduce the electrode into a sample solution while simultaneously observing the meter's output, and store the electrode when not in use. All structural components are intended to fit together with interlocking tabs and windows. A serial port fits within the construction of the main housing without the need for bolts, and battery clips that depend directly from the circuit board obviate the need for wiring connections. The present invention also features two calibration modes. A 'segment addition' mode permits separation of the voltage/concentration curve into individually plotted regions, the number of which depends on the number of reference solutions used in the calibration procedure. The segment corresponding most closely to the measured potential of a sample solution is used to calculate concentration. In an alternative calibration mode, one or more reference solutions are used to establish meterd voltage/concentraiton combinations that are compared with expected, known values. Any discrepancies therebetween furnish a 'noise level' value associated with the apparatus that can be used to move precisely define the orientation of the voltage/concentration curve.

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Haverhill, MA, United States of America

Loren Somes