Method for operating an ISFET sensor

US8668822B2 · kind B2 · utility

Assignee

• Endress+Hauser Conducta Gesellschaft fuer Mess- und Regeltechnik mbH + Co. KG · DE

Inventor

• Torsten Pechstein · Radebeul, DE

Key dates

• Filing date: Dec 17, 2010
• Grant date: Mar 11, 2014
• Expiry date: Sep 13, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/227
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for operating an ion-sensitive sensor with a measurement circuit which includes an ion-sensitive electrolyte-insulator-semiconductor structure (EIS); wherein the measurement circuit is embodied to issue an output signal which is dependent on ion concentration, especially a pH value, of a measured liquid; and wherein the method comprises the steps of: introducing the ion-sensitive electrolyte-insulator-semiconductor structure into a measured liquid; accelerating charging processes in the region of an insulator layer of the ion-sensitive electrolyte-insulator-semiconductor structure by operating the sensor over a predetermined time span at least a first working point; and dynamically adapting the working point to set a second working point, and registering and processing the output signal of the measurement circuit at the second working point.