Measuring cell of industrial pH meter
By designing a combination of porous alumina ceramic measuring cup and rubber top cover, the damage problem of solid particles to the electrodes by industrial pH meters in complex solutions is solved, and the protection and measurement accuracy of electrodes are achieved, which extends service life and reduces maintenance costs.
Patent Information
- Application Number
- CN202421744495.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-23
AI Technical Summary
When measuring complex solutions, solid particles are easily adsorbed on the surface of the glass electrode to form films, affecting the measurement sensitivity and accuracy, and easily damaging the electrodes and reducing service life.
The measuring cup made of porous alumina ceramic has a through-hole structure with a pore size of 70μm. It is designed as a threaded connection with a rubber top cover to ensure the entry of soluble ions while solid particles are blocked to protect the glass electrode.
Effectively protect glass electrodes, extend their service life, while maintaining the accuracy of pH measurement and low-cost maintenance. Porous alumina ceramics are high temperature resistant, corrosion-resistant and easy to clean.
Smart Images
Figure CN223139467U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technology of industrial instruments and meters, and particularly relates to the measuring cell technology of an industrial pH meter. Background Art
[0002] An industrial pH meter is an on-line instrument used to measure the acidity and alkalinity of a solution (i.e., pH value), and is widely used in industries such as chemical engineering, pharmaceuticals, food, and environmental protection. It can monitor the pH value of a liquid in real time, so as to control and optimize the production process. An industrial pH meter consists of a composite electrode (including a glass electrode and a reference electrode), an analog-to-digital converter, and a display. When the glass electrode is immersed in the solution, a potential difference will be generated between the hydrogen ion concentration on the electrode surface and the hydrogen ion concentration in the solution. This potential difference is proportional to the pH value of the solution, and the pH value is measured by measuring the potential difference value and calculating. The composition of the detection object of an industrial pH meter is usually quite complex. Taking the wastewater treatment in the environmental protection field as an example, in addition to microorganisms and various soluble metal ions in the water body, it also contains insoluble components such as large particle suspended solids, gravel, settleable solids, and colloids. After using for a period of time, these insoluble substances will gradually adsorb and accumulate on the surface of the glass electrode to form a film-like substance. This film-like substance will hinder the ion exchange between the glass electrode and the water body, thereby affecting the measurement sensitivity and accuracy of the industrial pH meter. When cleaning the film-like substance, it is very easy to cause scratches on the surface of the glass electrode and damage the electrode. This defect greatly reduces the service life of the electrode and easily leads to an incorrect evaluation of the pollution degree of the water body. Summary of the Invention
[0003] Aiming at the above problems existing in the prior art, the utility model provides a measuring cell of an industrial pH meter, which can avoid the damage of solid particles in the measured liquid to the glass electrode and extend the service life of the electrode as much as possible. The utility model designs a measuring cell of an industrial pH meter, including a measuring cup and a top cover. The characteristics are as follows: the material of the measuring cup is porous alumina ceramic, the pores of the porous alumina ceramic are through-hole structures, the pore diameter is 70μm, the material of the top cover is rubber, and there is a round hole at the center position of the top cover. The measuring cup and the top cover are fixed and connected through a threaded structure. The diameter of the composite electrode of the industrial pH meter is 1 - 2 millimeters larger than the diameter of the round hole. The advantages of the utility model are as follows: during measurement, hydrogen ions and other soluble ions in the measured liquid can penetrate through the 70μm diameter through-holes of the porous alumina ceramic measuring cup into the cavity of the measuring cup, while most of the solid particles cannot penetrate through the porous alumina ceramic into the cavity of the measuring cup. Since the direct contact between the insoluble substances and the glass electrode is avoided, the purpose of protecting the electrode is achieved without affecting the pH value measurement. The porous alumina ceramic has the characteristics of high temperature resistance, corrosion resistance, and stable chemical properties, and can be used repeatedly after cleaning, with a low usage cost. Description of the Drawings
[0004] Figure 1 This is a schematic cross-sectional view of the structure of the present utility model.
[0005] Figure 2 This is a schematic cross-sectional view of the structure during the use of the present utility model. Specific embodiments
[0006] The following details the specific embodiments of the present utility model in conjunction with the accompanying drawings, enabling those skilled in the art to more clearly understand how to practice the present utility model. Although the present utility model is described in conjunction with its preferred specific embodiments, these embodiments are merely illustrative and do not limit the scope of the present utility model.
[0007] In the figure, a measuring cell of an industrial pH meter includes a measuring cup 1 and a top cover 2. It is characterized in that: the material of the measuring cup is porous alumina ceramic, the pores of the porous alumina ceramic are through-hole structures (similar to the through-hole structure of a sponge), the pore diameter is 70 μm, the material of the top cover is rubber, and there is a circular hole 3 at the center position of the top cover. The measuring cup and the top cover are fixed and connected through a threaded 4 structure. The diameter of the composite electrode 5 of the industrial pH meter is 1 - 2 millimeters larger than the diameter of this circular hole.
[0008] During actual production, porous alumina ceramic with a thickness of 5 mm and a through-hole diameter of 70 μm is used as the raw material to manufacture a barrel-shaped structure with a height of 6 cm and an inner diameter of 4 cm, which serves as the measuring cup. A circle of internal threads is turned on the inner wall along the upper edge of the measuring cup. A circular rubber plate with a thickness of 1 cm and a diameter of 6 cm is taken as the top cover, and a circle of external threads is turned on the lower edge side of the top cover, so that the top cover and the measuring cup can be fixed through the threads. A circular hole is opened at the center of the top cover, and the diameter of the circular hole is about 2 mm smaller than the diameter of the pH meter composite electrode. With the extensibility of the rubber, the composite electrode can pass through this circular hole and be inserted into the cavity of the measuring cup while remaining fixed.
[0009] During use, the composite electrode is inserted through the top cover of the measuring cell from top to bottom into the measuring cup to a depth of 1 cm from the bottom of the cup, and the measuring cup is placed in the liquid to be measured, so that the liquid level height is maintained at about 1 cm from the cup mouth of the measuring cup. At this time, water molecules and water-soluble ions in the liquid to be measured flow into the cavity of the measuring cup through the through-holes with a diameter of 70 μm, while most insoluble particulate matters are blocked by the cup wall of the measuring cup and cannot enter the cavity of the measuring cup. The present invention protects the composite electrode while ensuring accurate measurement of the pH value of the liquid and extends its service life.
[0010] Due to the characteristics of porous alumina ceramic, such as high temperature resistance, corrosion resistance, and stable chemical properties, after being used for a period of time, the measuring cup can be taken out and rinsed with clean water to remove the particulate matters adsorbed in the through-holes, and can be reused repeatedly.
Claims
1. A measuring cell of an industrial pH meter, comprising a measuring cup and a top cover, characterized in that: The material of the measuring cup is porous alumina ceramic. The pores of the porous alumina ceramic are through-hole structures with a pore diameter of 70 μm. The material of the top cover is rubber, and there is a round hole at the center of the top cover.
2. The measuring cell of an industrial pH meter according to claim 1, characterized in that: The measuring cup and the top cover are fixed and connected through a threaded structure.
3. The measuring cell of an industrial pH meter according to claim 1, characterized in that: The diameter of the combined electrode of the industrial pH meter is 1 - 2 millimeters larger than the diameter of the round hole.