Patent Number: 6,168,707

Title: Ion measurement apparatus and methods for improving the accuracy thereof

Abstract: 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.

Inventors: Somes; Loren (Dracut, MA), Hovis; Jeffrey S. (Boston, MA), Bronk; Peter F. (Medford, MA), Caporiccio; Robert (Waltham, MA), Gillette; Timothy (Brookline, MA), Hrabosky; Stefan (Pepperell, MA)

Assignee: Orion Research, Inc.

International Classification: G01N 27/416 (20060101); G01N 027/26 (); G01N 027/36 ()

Expiration Date: 01/02/2018