Charging pH value sensor

Abstract

The invention relates to a pH value measurer and particularly relates to a charging pH value sensor. The charging pH value sensor comprises a pH value sensor body, wherein the pH value sensor body comprises a reference electrode shell and a sensor sheath. The charging pH value sensor is characterized in that a sealed annular cavity is arranged between the sensor sheath and the reference electrode shell; a make-up fluid and compressed gas are filled inside the annular cavity; a liquid supply hole for enabling the make-up fluid to enter inside the reference electrode shell is arranged on the reference electrode shell; and a charging hole communicated with the annular cavity is arranged on the sensor sheath. The charging pH value sensor has the beneficial effects that the service life of the sensor is greatly prolonged. Compared with gel cushion in the prior art, the service life is improved by 3-5 times. In addition, reverse osmosis of a detected solution is also avoided; the stability of a reference system is ensured; the detection precision is improved, and fussy checkout of a detection electrode is avoided.

Description

technical field [0001] The invention relates to a device for measuring the pH value of water or solution, in particular to a pressure-filled pH value sensor. Background technique [0002] At present, the pH value sensor is widely used in the pH value measurement of water, high-purity water, chemical solutions and other liquids in water treatment, aquaculture, chemical industry, pharmaceutical and other industries. The definition of the so-called pH value is: the negative logarithm of the hydrogen ion activity in the measured solution. For acid, alkali, and salt solutions, the uniform hydrogen ion concentration can be used to represent the pH of the solution. A pH sensor generally includes a working electrode and a working electrode housing, a reference electrode and a reference electrode housing, the working electrode housing is set in the reference electrode housing, and the working electrode housing is filled with a working electrode housing. buffer solution, the referenc...

AI Technical Summary

Problems solved by technology

Because in the test, the reference buffer solution needs to penetrate into the tested solution through the salt bridge, it inevitably causes the following problems: First, the concentration of chloride ions in the reference solution is gradually changing, resulting in a slow drift of the measurement results

In the measurement occasions that require very high pH accuracy, it is necessary to calibrate the electrode frequently, which is not only troublesome, but also not conducive to continuous measurement; second, when the pressure of the reference solution is lower than the pressure of the solution to be tested, it will The reverse osmosis of the solution to be tested to the reference solution through the salt bridge will cause measurement inaccuracy and even sensor failure; the third is that with the loss of the reference solution, the measurement accuracy will not meet the requirements, and the sensor will be scrapped , short service life

[0003] In order to solve the above problems, there are two measures in the prior art. One is to use gel instead of reference solution. Although it can reduce the excessive loss of reference solution, it will cause the concentration distribution of chloride ions in the gel during use. unevenness, which will have an adverse effect on the measurement results; the other is that in some occasions that require high accuracy and high stability, the reference electrode shell is connected to the bottle-type supplementary liquid through pipelines, although the measurement The accuracy is relatively accurate, but the overall size of the sensor is large, the shape and structure design is relatively cumbersome, and the service life is short, and the glass electrode needs to be replaced frequently. For non-technical personnel, installation and use are inconvenient and very impractical

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