Electricity: measuring and testing – Electrolyte properties – Using a ph determining device
Reexamination Certificate
2005-02-08
2005-02-08
Le, N. (Department: 2858)
Electricity: measuring and testing
Electrolyte properties
Using a ph determining device
C324S459000, C324S464000
Reexamination Certificate
active
06853195
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.
REFERENCES:
patent: 4506226 (1985-03-01), Luce et al.
patent: 5267569 (1993-12-01), Lienhard
Gehrke Martin
Wittmer Detlev
Endress + Hauser Conducta Gesellschaft fur Mess und Regeltechnik
Hoffman Wasson & Gitler PC
Le N.
Nguyen Vincent Q.
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