Patent · US Expired

Device and process for measurement of the concentration of ions in a measurement liquid

US6853195B2 · kind B2 · utility

1Cited by

2References

5Claims

0Family size

Assignee

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

Inventors

Martin Gehrke · Waiblingen, DE
Detlev Wittmer · Maulbronn, DE

Key dates

Filing date	Apr 5, 2002
Grant date	Feb 8, 2005
Priority date	—
Expiry date	Aug 12, 2022

Classification

Technology area (CPC G)Physics
CPC primaryG01N27/4167
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A symmetrically wired device and a process for measurement of the concentration of ions, especially hydrogen (H+) ions, in a measurement liquid. The device comprises a pH-sensitive measurement electrode, a reference electrode and a comparison electrode, all located in the measurement liquid and which places the measurement liquid at a definable ground reference. The device forms a difference signal referenced to the ground reference from the difference between a measurement signal (φpH) of the measurement electrode and the reference signal (φref) of the reference electrode. The difference signal is dependent on the ion concentration in the measurement liquid. The device compensates for the noise potential (φchem) arising between the comparison electrode and the measurement electrode by setting a reference potential (φbez) on the comparison electrode, such that φref assumes a zero value.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.