Analyte and pH measuring sensor assembly and method

US5336388A · kind A · utility

Assignee

• PPG Industries, Inc. · US

Inventors

• Matthew J. Leader · Long Beach, US
• Kee Van Sin · Lino Lakes, US

Key dates

• Filing date: Dec 26, 1991
• Grant date: Aug 9, 1994
• Expiry date: Dec 26, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/403
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The sensor apparatus of the present invention includes on a nonconducting substrate electrically conductive pathways leading to at least two analyte electrodes and one reference electrode. The analyte electrodes each have sensitivities for both analytes but each has a membrane and/or electrolyte that favors the conversion of ionic potential to electronic potential for a different analyte. The apparatus has an fluid circuit means for liquid contact between the electrodes so that electric signals can be sent by electric circuitry to an analyzing means. The analyzing means determines the values of the analytes from the following simultaneous relationships: ##EQU1## where: delta mV=change in millivolts PA1 A1=first analyte PA1 A2=second analyte PA1 E1=electrode constructed to favor the first analyte PA1 E2=electrode constructed to favor the second analyte PA1 SE1A1=sensitivity of the electrode favoring the first analyte for the first analyte PA1 SE1A2=sensitivity of the electrode favoring the first analyte for the second analyte PA1 SE2A1=sensitivity of the electrode favoring the second analyte for the first analyte PA1 SE2A2=sensitivity of the electrode favoring the second analyte for…