METHOD AND DEVICE FOR DETECTING PH VALUE OF A SOLUTION

• US 20140291171A1
• Filed: 11/30/2012
• Published: 10/02/2014
• Est. Priority Date: 12/02/2011
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Wang, Guangwei, Hu, Peixin
• Granted Patent: US 10,024,815 B2
• Time in Patent Office: Days
• US Class Current: 205/787.5
• CPC Class Codes: G01N 27/302 pH sensitive, e.g. quinhydron, antimony or hydrogen electrodes ion selective electrodes G01N27/333, glass electrodes G01N27/36
• CPC Class Codes: G01N 27/4167 pH electrodes therefor G01N27/302, G01N27/36

Abstract

The present invention provides a PH value detection device and a method of detecting a PH value of a solution. The PH value detection device may comprise: a first electrode and a second electrode, wherein the first electrode and the second electrode are to be inserted into the solution; a power source for applying a bipolar rectangular potential pulse signal to the first electrode and the second electrode; a current detection means connected between the first electrode and the second electrode for detecting a current I flowing through the first electrode and the second electrode; and a calculating unit for calculating the PH value of the solution, based on the detected current I. By means of the above design of the present invention, the use of the fragile glass electrode and the reference electrode, e.g., an Ag/AgCl, saturated calomel electrode, can be avoided, which has a favorable effect on the daily maintenance of the PH value detection device and on the protection of the environment, and it also has a favorable effect on the miniaturization and facilitation of the PH value detection device. In addition, only measuring the current flowing through the electrode pair to calculate the PH value of the solution facilitates real time monitoring of the change of the PH value of the solution.

Claims

1. A PH value detection device for detecting the PH value of a solution, comprising:

a first electrode and a second electrode, wherein the first electrode and the second electrode are to be inserted into the solution, the first electrode comprises a transition metal/transition metal oxide electrode, and the second electrode comprises an inert electrode;

a power source for applying a bipolar rectangular potential pulse signal to the first electrode and the second electrode;

a current detection means connected between the first electrode and the second electrode for detecting a current I flowing through the first electrode and the second electrode; and

a calculating unit for calculating the PH value of the solution, based on the detected current I.

3. The device as claimed in claim 1, wherein the transition metal/transition metal oxide electrode is selected from an Ag/Ag₂O electrode, W/WO₃ electrode, Mn/MnO electrode or Ir/IrO₂ electrode, and the inert electrode is selected from a Cu electrode, Pt electrode, Au electrode or stainless steel electrode.

4. The device as claimed in claim 1, wherein the PH value detection device comprises:

A storing unit for pre-storing a function which correlates the current I and the PH value.

5. The device as claimed in claim 1, wherein the storing unit pre-stores a plurality of functions correlating the current I and the PH value, each function being associated with the type of solution to be detected, wherein the PH value detection device further comprises:

a user interface for receiving data reflecting the type of solution to be detected for selecting a function from said plurality of functions.

6. The device as claimed in claim 4, wherein the calculating unit calculates the PH value of the solution to be detected according to the detected current I and the pre-stored function.

2. (canceled)

7. A method of detecting a PH value of a solution, comprising:

applying a bipolar rectangular potential pulse signal to a first electrode and a second electrode inserted into the solution, wherein the first electrode comprises transition metal/transition metal oxide electrode, and the second electrode corn rises an inert electrode;

detecting a current I flowing through the first electrode and the second electrode; and

calculating the PH value of the solution, based on the detected current I.

9. The method as claimed in claim 7, wherein the transition metal/transition metal oxide electrode is selected from an Ag/Ag₂O electrode, W/WO₃ electrode, Mn/MnO electrode or Ir/IrO₂ electrode, and the inert electrode is selected from a Cu electrode, Pt electrode, Au electrode or stainless steel electrode.

10. The method as claimed in claim 7, further comprising pre-storing a function which correlates the current I and the PH value.

11. The method as claimed in claim 7, further comprising pre-storing a plurality of functions correlating the current 1 and the PH value, each function being associated with the type of solution to be detected.

12. The method as claimed in claim 11, further comprising receiving data reflecting the type of solution to be detected from a user interface for selecting a function from said plurality of functions.

13. The method as claimed in claim 11, wherein the PH value of the solution to be detected is calculated based on the detected current I and the pre-stored function.

8. (canceled)