Electrolytic tank device for coulometry Karl Fischer moisture meter

Abstract

The utility model discloses an electrolytic tank device for a coulometry Karl Fischer moisture meter, and belongs to the technical field of application of analytical instruments. The device comprises an electrolytic tank body, an electrolytic electrode inserted into the electrolytic tank body from the top of the electrolytic tank body, a measuring electrode and a drying plug, a sample injection pipe communicated with the interior of the electrolytic tank body is arranged on the side part of the electrolytic tank body, and a sample injection cock is arranged on the sample injection pipe; the center line of the sample introduction pipe and the center line of the electrolytic cell body form an angle of 45 degrees, and the sample introduction pipe is positioned at the middle position of the total height of the electrolytic cell body. According to the device, the sample inlet hole site is designed on the side surface of the electrolytic tank body, and a proper angle and height are set, so that a sample injection needle can be in contact with a Karl reagent during sample injection, the sample loss is reduced, and the measurement accuracy is improved. And the device is convenient to disassemble and assemble, high in universality, convenient to use and operate and low in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of analytical instrument application, and in particular relates to an electrolytic cell device for a coulometric Karl Fischer moisture meter. Background Art

[0002] The Karl Fischer method for determining the moisture content of substances has become a world-recognized classic method for measuring moisture due to its simple operation and accurate results. The international ISO standard recommends the use of the Karl Fischer coulometric method to determine the moisture content of substances. The electrolytic cell is a one-time signal source for the coulometric Karl Fischer moisture determination system. The redox reaction of water and Karl Fischer reagent and the collection of electrical quantity signals in the reaction are all completed in the electrolytic cell. Therefore, the electrolytic cell is a very critical part of the coulometric Karl Fischer moisture determination system. Its structural design directly affects the collection of electrical quantity signals and the injection operation, and thus affects the accuracy of the measurement of the entire system.

[0003] The existing electrolytic cell device for coulometric Karl Fischer titrator has an unreasonable structural design, which cannot ensure that the syringe port enters below the liquid level when the syringe is injected, resulting in part of the sample hanging outside the syringe needle. When the syringe is pulled out, the hanging sample adheres to the injection gasket, causing sample loss, affecting the accuracy of the test results, and generating large errors. For example, the injection port hole is designed on the upper part of the electrolytic cell body, and the electrolytic cell body is too high. At present, although there are electrolytic cells with the injection port set on the side, due to the problems of the injection port angle, length and injection plug size, even when an extended syringe is used for injection, it is not possible to ensure that the injection port enters below the liquid level. Utility Model Content

[0004] In order to solve the deficiencies of the prior art, the purpose of the utility model is to provide an electrolytic cell device for a coulometric Karl Fischer titrator. The electrolytic cell device for a coulometric Karl Fischer titrator provided by the utility model can ensure that the needle is below the liquid level of the Karl Fischer reagent when the syringe is injecting samples.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] The first aspect of the utility model provides an electrolytic cell device for a coulometric Karl Fischer titrator, comprising: an electrolytic cell body, an electrolytic electrode, a measuring electrode and a drying plug inserted into the electrolytic cell body from the top of the electrolytic cell body; a sampling tube connected to the inside of the electrolytic cell body is provided on the side of the electrolytic cell body, and a sampling cock is provided on the sampling tube; the center line of the sampling tube is 45 degrees with the center line of the electrolytic cell body, and the sampling tube is located in the middle of the total height of the electrolytic cell body.

[0007] In some embodiments of the utility model, an electrolysis electrode hole, a measuring electrode hole and a drying tube hole are provided on the top of the electrolysis cell body, the electrolysis electrode is inserted into the electrolysis cell body through the electrolysis electrode hole, the measuring electrode is inserted into the electrolysis cell through the measuring electrode hole, and the drying plug seals the drying tube hole.

[0008] In some embodiments of the present invention, the distance between the central axes of the electrolysis electrode hole and the measurement electrode hole is 5.3 mm.

[0009] In some embodiments of the present invention, the sizes of the electrolysis electrode holes, the measuring electrode holes and the drying tube holes are different.

[0010] In some embodiments of the present invention, the apertures of the electrolysis electrode holes, the measuring electrode holes and the drying tube holes are arranged in descending order, namely, the electrolysis electrode holes, the measuring electrode holes and the drying tube holes.

[0011] In some embodiments of the utility model, the electrolytic cell device for a coulometric Karl Fischer titrator further comprises a measuring gas injection hole and a gas injection plug; the measuring gas injection hole is arranged at the top of the electrolytic cell body, and the gas injection plug seals the measuring gas injection hole.

[0012] In some embodiments of the present invention, the measurement gas injection hole is smaller than the measurement electrode hole and larger than the drying tube hole.

[0013] In some embodiments of the utility model, the injection plug is a recessed injection plug, which includes an injection plug bottom, an injection plug pad and an injection plug, and the injection plug and the injection plug have through holes on their vertical center axes; the injection plug pad is arranged between the injection plug and the injection plug bottom to seal the through hole; a groove is provided on the top of the injection plug, and the vertical center axis of the groove coincides with the vertical center axis of the through hole.

[0014] In some embodiments of the present invention, the injection plug is connected to the injection plug bottom via threads.

[0015] In some embodiments of the present invention, the groove is a cylindrical groove.

[0016] The beneficial effects of the utility model are:

[0017] The utility model provides an electrolytic cell device for a coulometric Karl Fischer moisture meter, comprising: an electrolytic cell body, an electrolytic electrode, a measuring electrode and a drying plug inserted into the electrolytic cell body from the top of the electrolytic cell body, a sampling tube connected to the inside of the electrolytic cell body provided on the side of the electrolytic cell body, and a sampling cock provided on the sampling tube; the center line of the sampling tube is 45 degrees with the center line of the electrolytic cell body, and the sampling tube is located in the middle of the total height of the electrolytic cell body. When the electrolytic cell device of the utility model is used for water determination, the redox reaction of water and Karl Fischer reagent and the collection of electric quantity signals are all completed in the device. The device designs the injection port hole position on the side of the electrolytic cell body, and by setting a suitable angle and height, the injection needle can contact the Karl Fischer reagent during injection, reducing sample loss and improving measurement accuracy. When the electrolytic cell device is installed, each accessory is inserted into the corresponding hole position, and silicone grease (for sealing) is applied and tightened. The device is easy to disassemble and install, has strong versatility, is easy to use, is easy to operate, has low cost, and is conducive to popularization and use.

[0018] The utility model also designs a perfect anti-misinsertion measure to eliminate the possibility of misinsertion from the structural point of view. The diameters of the holes on the top of the electrolytic cell body are different. This hole size design eliminates the possibility of misinsertion from the structural point of view and saves installation time.

[0019] The sample injection cock of the utility model is a recessed sample injection cock, which reduces the distance between the extended sample injection needle and the liquid surface of the Karlsruhe reagent during sample injection and reduces the requirement on the length of the sample injection needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 It is a front view of the electrolytic cell device for the coulometric Karl Fischer moisture meter according to an embodiment of the utility model;

[0022] Figure 2 A top view of an electrolytic cell device for a coulometric Karl Fischer moisture meter according to an embodiment of the present utility model;

[0023] Figure 3 It is an overall structural diagram of an electrolytic cell device for a coulometric Karl Fischer moisture meter according to an embodiment of the utility model;

[0024] Figure 4 A top view of the electrolytic cell body in an embodiment of the utility model;

[0025] Figure 5 for Figure 4 Sectional view in the AA direction;

[0026] Figure 6 This is an overall diagram of the sample injection plug in the embodiment of the utility model;

[0027] Figure 7 It is a cross-sectional view of the sample injection plug in the embodiment of the utility model;

[0028] Figure 8 A top view of the sample injection plug in the embodiment of the utility model;

[0029] Fig. 9 This is an overall diagram of the bottom of the sample injection plug in the embodiment of the utility model;

[0030] Fig.10 It is a cross-sectional view of the bottom of the sample injection plug in the embodiment of the utility model;

[0031] Fig.11 A top view of the bottom of the injection plug in the embodiment of the utility model;

[0032] Fig.12 This is an overall diagram of the injection plug pad in the embodiment of the utility model.

[0033] Wherein: 1-electrolytic cell body, 2-electrolytic electrode, 3-measuring electrode, 4-drying plug, 5-injection cock, 6-drying tube, 7-gas injection plug, 101-injection port, 102, electrolytic electrode hole, 103-measuring electrode hole, 104-drying tube hole, 105-measuring gas injection hole, 501-injection plug bottom, 502-injection plug pad, 503-injection plug, 504-through hole, 505-through hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 A front view of an electrolytic cell device for a coulometric Karl Fischer moisture meter provided in an embodiment of the utility model, Figure 2 A top view of an electrolytic cell device for a coulometric Karl Fischer moisture meter provided in an embodiment of the utility model, Figure 3 The present invention provides an overall structural diagram of an electrolytic cell device for a coulometric Karl Fischer moisture meter according to an embodiment of the present invention.

[0037] The electrolytic cell device for the coulometric Karl Fischer moisture analyzer comprises:

[0038] The electrolytic cell body 1 includes an electrolytic electrode 2, a measuring electrode 3 and a drying plug 4 inserted into the electrolytic cell body 1 from the top of the electrolytic cell body 1; a sampling tube connected to the inside of the electrolytic cell body is provided on the side of the electrolytic cell body 1, and a sampling cock 5 is provided on the sampling tube; the center line of the sampling tube is 45 degrees with the center line of the electrolytic cell body 1, and the sampling tube is located in the middle of the total height of the electrolytic cell body 1.

[0039] It can be understood that the detection principle of the coulometric Karl Fischer moisture meter is as follows: when the Karl Fischer reagent in the electrolytic cell reaches equilibrium, a water-containing sample is injected, and water participates in the redox reaction of iodine and sulfur dioxide. In the presence of pyridine and methanol, pyridine hydroiodide and pyridine methyl sulfate are generated, and the consumed iodine is electrolyzed at the anode, thereby allowing the redox reaction to continue until all the water is consumed. According to Faraday's law of electrolysis, the iodine produced by electrolysis is directly proportional to the amount of electricity consumed during electrolysis, and the moisture content of the sample to be tested is calculated.

[0040] When using a coulometric Karl Fischer titrator to detect water content, 100 mL of Karl Fischer reagent is usually added to the electrolytic cell. The amount added is relatively small. The Karl Fischer reagent is located at the bottom of the electrolytic cell body 1. There is a problem that the needle of the injection needle / syringe cannot be inserted into the Karl Fischer reagent, which affects the detection accuracy. In this regard, the present application provides a corresponding injection tube at the side of the electrolytic cell body 1, limiting its height and angle. This distance and angle design can ensure that the extended injection needle (needle length is about 80 mm) can contact the Karl Fischer reagent in the electrolytic cell 1, ensuring the accuracy of water content detection.

[0041] It is understandable that the electrolysis electrode 2 and the measuring electrode 3 are both platinum electrodes. Platinum electrodes have the advantages of good potential stability, fast response speed, long service life, etc., and can accurately measure the moisture content. Figure 2 and Figure 3 As shown, there is a certain distance between the electrolysis electrode 2 and the measuring electrode 3. Under the action of the electrodes, the water molecules in the sample will be ionized into positive and negative ions, thereby forming a potential difference. This potential difference will form a certain current value. According to Faraday's law of electrolysis, there is a certain proportional relationship between the current value and the amount of electricity, so the water content in the sample can be calculated based on the current value.

[0042] The electrolytic cell device for the coulometric Karl Fischer titrator further includes a drying tube 6, which is inserted into the electrolytic cell body 1 from the top of the electrolytic cell body 1, and the drying plug 4 is arranged on the top of the drying tube 6. The drying tube 6 is used to absorb the moisture in the electrolytic cell body 1 to ensure that the electrolytic cell body 1 is dry, and accordingly, the drying tube 6 is filled with a desiccant.

[0043] The drying tube 6 has a certain height, combined with Figure 1 and Figure 5 It can be seen that after the drying tube 4 and the drying plug 4 are installed on the electrolytic cell body 1, the height of the electrolytic cell device is 217.5 mm, the height of the electrolytic cell body 1 is 107 mm, and the wall thickness of the top of the electrolytic cell body 1 is 17 mm.

[0044] The electrolytic cell device for the coulometric Karl Fischer titrator further comprises a gas injection plug 7 , which is also arranged at the top of the electrolytic cell body 1 and is used to seal the measurement gas injection hole 105 at the top of the electrolytic cell body 1 .

[0045] When using a coulometric Karl Fischer titrator to detect moisture, when the sample to be tested is a soluble substance, the sample to be tested is dissolved, and then an extended injection needle is used to pass through the injection cock 5 and added to the Karl Fischer reagent in the electrolytic cell body 1 to perform moisture measurement; when the sample to be tested is an insoluble substance, it is necessary to use special equipment to heat and melt it, and use a pipeline to add the generated gas (moisture) through the measuring gas injection hole 105 into the Karl Fischer reagent in the electrolytic cell body 1 to perform moisture measurement.

[0046] refer to Figure 4 and Figure 5 , Figure 4 A top view of an electrolytic cell body provided in an embodiment of the utility model, Figure 5 for Figure 4 Cross-sectional view along the AA direction.

[0047] In order to ensure a high yield rate of the electrolytic cell device, the present embodiment limits the size of the electrolytic cell body 1. Figure 4 As shown, the top of the electrolytic cell body 1 is provided with an electrolytic electrode hole 102, a measuring electrode hole 103, a drying tube hole 104 and a measuring gas injection hole 105. The electrolytic electrode 2 is inserted into the electrolytic cell body 1 through the electrolytic electrode hole 102, the measuring electrode 3 is inserted into the electrolytic cell body 1 through the measuring electrode hole 103, the drying tube 6 is inserted into the drying tube hole 104, and the drying tube hole 104 is sealed.

[0048] The walls of the electrolysis electrode hole 102, the measuring electrode hole 103, the drying tube hole 104 and the measuring gas injection hole 105 are all frosted, and the taper of these four holes is 1:15. The contact surfaces of the corresponding electrodes, tubes or plugs connected to these four holes are also frosted. This frosted structural design is conducive to the internal sealing of the electrolytic cell body 1, and prevents water vapor in the external environment from entering the electrolytic cell body 1 and affecting the detection results. Furthermore, in order to improve the sealing effect, a layer of silica gel can be applied to the contact surfaces of the electrodes, tubes or plugs connected to the four holes during installation.

[0049] like Figure 4 As shown, the distance between the central axes of the electrolysis electrode hole 102 and the measurement electrode hole 103 is 5.3 mm. This can ensure the balance of the electric potential field during the redox reaction.

[0050] The utility model also designs a perfect anti-misinsertion measure to eliminate the possibility of misinsertion from the structure. Each hole position of the electrolytic cell adopts a measure that can only be installed if it is installed correctly, and cannot be installed if it is installed incorrectly. Specifically, the sizes of the electrolysis electrode hole 102, the measuring electrode hole 103, the drying tube hole 104 and the measuring gas injection hole 105 are different. The apertures of the electrolysis electrode hole 102, the measuring electrode hole 103, the drying tube hole 104 and the measuring gas injection hole 105 are arranged in order from large to small, namely, the electrolysis electrode hole 102, the measuring electrode hole 103, the measuring gas injection hole 105 and the drying tube hole 104. This aperture size design eliminates the possibility of misinsertion from the structure and saves installation time.

[0051] like Figure 4 As shown, the diameter of the electrolysis electrode hole 102 is 34 mm, the diameter of the measuring electrode hole 103 is 14 mm, the diameter of the measuring gas injection hole 105 is 12 mm, and the diameter of the drying tube hole 104 is 10 mm. The centers of the measuring electrode hole 103, the measuring gas injection hole 105, and the drying tube hole 104 are on the same circle, the diameter of the circle is 47 mm, the center of the circle is on the same straight line as the center of the measuring gas injection hole 105 and the electrolysis electrode hole 102, the electrolysis electrode hole 102 is within the circle, and a certain diameter of the electrolysis electrode hole 102 is inscribed in the circle.

[0052] like Figure 4 As shown, the distance between the central axes of the electrolysis electrode hole 102 and the drying tube hole 104 is also 5.3 mm.

[0053] Similarly, if Figure 4 As shown, the inner wall of the injection port 101 at the top of the injection tube is also frosted, the taper of the hole is 1:15, and the diameter of the injection port 101 is 15 mm.

[0054] like Figure 5As shown, the wall thickness of the side wall and the bottom of the electrolytic cell body 1 is 2 mm, the inner diameter is 69 mm, and the outer diameter is 73 mm. The wall thickness of the top of the electrolytic cell body 1 is 17 mm, that is, the depth of the electrolytic electrode hole 102, the measuring electrode hole 103, the measuring gas injection hole 105 and the drying tube hole 104 is 17 mm. The longest side length of the injection tube on the side of the electrolytic cell body 1 is 32 mm, the outer diameter of the injection port 101 is 23 mm, the outer diameter of the injection tube is 20 mm, and the inner diameter is 15.5 mm.

[0055] The size and structural design of the electrolytic cell device can ensure that the extended injection needle (needle length is 80mm) contacts the Karlsruhe reagent. The electrolytic cell device designed by the utility model has accurate positioning, strong versatility, convenient use, simple operation, and is conducive to popularization and use.

[0056] refer to Figure 1 and Figure 6-Figure 12 , Figure 6 The overall diagram of the injection plug provided by the embodiment of the utility model is as follows: Figure 7 A cross-sectional view of a sample injection plug provided in an embodiment of the utility model, Figure 8 A top view of the sample injection plug provided in an embodiment of the utility model, Fig. 9 This is an overall diagram of the bottom of the sample injection plug provided in the embodiment of the utility model. Fig.10 This is a cross-sectional view of the bottom of the injection plug provided in an embodiment of the utility model. Fig.11 A top view of the bottom of the injection plug provided by an embodiment of the utility model, Fig.12 This is an overall diagram of the injection plug pad provided in an embodiment of the utility model.

[0057] like Figure 1 As shown, the injection cock 5 is a recessed injection cock, comprising an injection cock bottom 501, an injection cock pad 502 and an injection cock 503. A through hole 504 ( Figure 7 ), the vertical center axis of the injection plug bottom 501 is provided with a through hole 505 ( Fig.10 ); the injection plug pad 502 is arranged between the injection plug 503 and the injection plug bottom 501, and seals the through hole 504 and the through hole 505 at the same time; a groove is provided on the top of the injection plug 503, and the vertical center axis of the groove coincides with the vertical center axis of the through hole 504.

[0058] The design of the recessed injection cock reduces the distance between the extended injection needle and the liquid surface of the Karlsruhe reagent during injection, thereby reducing the requirement for the injection needle length.

[0059] The material of the injection cock 5 can be polyethylene.

[0060] The injection plug 503 is connected to the injection plug bottom 501 via threads.

[0061] like Figure 7As shown, the outer diameter of the top of the injection plug 503 is 18mm and the height is 18mm; the groove at the top of the injection plug 503 is a cylindrical groove with a diameter of 9mm, a depth of 5mm and a length of 13mm. The diameter of the through hole 504 in the injection plug 503 is 1.5mm. The diameter of the through hole 504 is larger than the diameter of the injection needle, which can ensure the smooth addition of the sample. The outer surface of the lower part (10mm) of the injection plug 503 is provided with a thread for connecting with the injection plug bottom 501, and its specification is M10*1.

[0062] like Fig.10 As shown, the injection plug bottom 501 is conical, with a height of 18 mm and an outer diameter of 18 mm at the top. The top of the injection plug bottom 501 is also provided with a cylindrical groove, the diameter of the groove is 12.5 mm, and the depth of the groove is 5 mm. The lower part of the cylindrical groove is connected with a thread, and the specification of the thread is M10*1. The bottom of the injection plug bottom 501 is provided with a through hole 505, and the length of the through hole 505 is 2 mm and the diameter is 3 mm.

[0063] like Fig.12 As shown, the injection plug pad 502 is a cylindrical pad, which can be a silicone pad, has a certain elasticity, and can achieve a good sealing effect. The diameter of the injection plug pad 502 is 7.5 mm and the height is 3 mm. The injection plug pad 502 of this size can fully seal the through hole 504 and the through hole 505 to prevent moisture in the external environment from entering the electrolytic cell body 1 and affecting the accuracy of the detection result.

[0064] The electrolytic cell body 1 and its accessories in the electrolytic cell device of the utility model are all made of glass, and all structural parts are designed to be inserted correctly. In the electrolytic cell device of the utility model, the redox reaction of water and Karl Fischer's reagent and the acquisition of electrical quantity signals are all completed in this device. The device designs the injection port hole position on the side of the electrolytic cell body, and by setting a suitable angle and height, the injection needle can contact the Karl Fischer's reagent during injection, thereby reducing sample loss and improving measurement accuracy. When the electrolytic cell device is installed, each accessory is inserted into the corresponding hole position, smeared with silicone grease (for sealing) and tightened. The device is easy to disassemble and install, has strong versatility, is easy to use, easy to operate, and has low cost, which is conducive to popularization and use.

[0065] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electrolytic cell device for a coulometric Karl Fischer moisture meter, comprising: The electrolytic cell body includes an electrolytic electrode, a measuring electrode and a drying plug inserted into the electrolytic cell body from the top of the electrolytic cell body, wherein a sampling tube connected to the inside of the electrolytic cell body is provided on the side of the electrolytic cell body, and a sampling cock is provided on the sampling tube; the center line of the sampling tube is 45° with the center line of the electrolytic cell body, and the sampling tube is located in the middle of the total height of the electrolytic cell body.

2. The electrolytic cell device for a coulometric Karl Fischer titrator according to claim 1, characterized in that: The top of the electrolytic cell body is provided with an electrolytic electrode hole, a measuring electrode hole and a drying tube hole. The electrolytic electrode is inserted into the electrolytic cell body through the electrolytic electrode hole, the measuring electrode is inserted into the electrolytic cell through the measuring electrode hole, and the drying plug seals the drying tube hole.

3. The electrolytic cell device for a coulometric Karl Fischer titrator as claimed in claim 2, characterized in that: The distance between the central axes of the electrolysis electrode hole and the measurement electrode hole is 5.3 mm.

4. The electrolytic cell device for a coulometric Karl Fischer titrator as claimed in claim 2, characterized in that: The sizes of the electrolysis electrode holes, the measuring electrode holes and the drying tube holes are different.

5. The electrolytic cell device for a coulometric Karl Fischer titrator as claimed in claim 2, characterized in that: The apertures of the electrolysis electrode holes, the measuring electrode holes and the drying tube holes are arranged in descending order, namely, the electrolysis electrode holes, the measuring electrode holes and the drying tube holes.

6. The electrolytic cell device for a coulometric Karl Fischer titrator as claimed in claim 2, characterized in that: It also includes a measuring gas injection hole and a gas injection plug; the measuring gas injection hole is arranged on the top of the electrolytic cell body, and the gas injection plug seals the measuring gas injection hole.

7. The electrolytic cell device for a coulometric Karl Fischer titrator as claimed in claim 6, characterized in that: The measuring gas injection hole is smaller than the measuring electrode hole and larger than the drying tube hole.

8. The electrolytic cell device for a coulometric Karl Fischer titrator according to claim 1, characterized in that: The injection plug is a recessed injection plug, which includes an injection plug bottom, an injection plug pad and an injection plug. The injection plug and the injection plug bottom are both provided with through holes on their vertical center axes; the injection plug pad is arranged between the injection plug and the injection plug bottom to seal the through hole; a groove is provided on the top of the injection plug, and the vertical center axis of the groove coincides with the vertical center axis of the through hole.

9. The electrolytic cell device for a coulometric Karl Fischer titrator as claimed in claim 8, characterized in that: The injection plug is connected to the injection plug bottom through threads.

10. The electrolytic cell device for a coulometric Karl Fischer titrator according to claim 8, characterized in that: The groove is a cylindrical groove.

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