Method for operating a measuring device having at least one probe, which has at least one ion selective electrode

US8691074B2 · kind B2 · utility

Assignee

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

Inventors

• Stefan Wilke · Seeburg, DE
• Anja Harbig · Renningen, DE
• Daniel Iten · Uster, CH
• Gunter Jahl · Gerlingen, DE

Key dates

• Filing date: Sep 28, 2011
• Grant date: Apr 8, 2014
• Expiry date: Jul 27, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/333
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for operating a measuring device comprising the following steps: providing a first sample of the liquid; ascertaining an updated calibration function by means of a standard addition method, wherein the first sample is supplemented at least once with a standard solution, which has a known concentration of the measured ion; determining a measured value of concentration of the measured ion in the first sample; providing a second sample of the liquid; ascertaining a measured value of concentration of the measured ion in the second sample as a reference measured ion concentration (cref) by means of a reference method; and determining a difference (cdisturb) between the apparent measured ion concentration (capparent) and the reference measured ion concentration (cref) and deriving a correction value (ckorr) therefrom for future measured values of concentration of the measured ion in the liquid, as ascertained with the measuring device.