Electrode assisted support and pH tester

Abstract

The utility model discloses an electrode auxiliary support and pH tester, electrode auxiliary support includes support rod, and the support arm for supporting pH electrode of being sleeved on support rod, support rod is screw rod, be equipped with the axle hole for being sleeved on the tester support rod in support rod, be equipped with the first nut for fixing the height of support arm on the support rod of support arm lower side. The utility model discloses support rod can be directly sleeved on the support rod of existing pH measuring instrument, and support rod is screw rod, and the tester can fix the height of support arm after determining the pH electrode height according to sample container, avoids the test error of electrode height, and promotes test result consistency and accuracy.

Description

Technical Field

[0001] This utility model relates to an instrument support, particularly to an electrode auxiliary support for a pH meter, and also to a pH meter. Background Technology

[0002] A pH electrode, also known as a pH probe, is a structure on a pH meter used to insert into the sample to acquire a signal. When measuring the electrode potential of a substance, the electrode is typically held by the end or inserted into its built-in support rod, with the bulb at the testing end immersed in the test solution. For different users or parallel tests, the electrode's position needs to be re-established based on the container volume before testing. This is because the pH meter's support rod is a bare rod; removing or placing the electrode or changing samples can cause the support arm to slide up and down, resulting in unstable electrode height and inaccurate test results. Verification can be performed using the graduations on containers such as beakers or conical flasks, and visual verification can be used to check for discrepancies (e.g.,...). Figure 1 (See Tables 1 and 2). If the height of the support rod is readjusted according to the ruler every time, the operation is troublesome.

[0003] CN211061508U discloses an acidity meter in which a sliding rod can slide up and down when the push rod is pressed, and the position of the sliding rod is fixed when the push rod is released. The height of the pH electrode can be adjusted by different gears, which can also ensure the stability of the test process. This solution requires a large modification to the structure of the pH meter and is not compatible with existing pH meters. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide an electrode auxiliary support that is compatible with existing pH testers and improves the consistency of test results. Another purpose of this utility model is to provide a pH tester that improves the accuracy of test results.

[0005] Technical solution: The present invention provides an electrode auxiliary support, comprising a support rod and a support arm sleeved on the support rod for supporting a pH electrode. The support rod is a threaded rod, and the support rod has a shaft hole for sleeved on a tester support rod. The support rod on the lower side of the support arm has a first nut for fixing the height of the support arm.

[0006] Preferably, a second nut for fixing the support arm is provided on the support rod on the upper side of the support arm.

[0007] Preferably, the bottom end of the support rod is provided with an inclined surface that mates with the upper surface of the pH meter.

[0008] Preferably, the support rod has a base at its bottom, the outer diameter of the base is larger than the outer diameter of the support rod, and the inclined surface is located at the bottom of the base.

[0009] Preferably, the end of the support arm away from the support rod is provided with a through hole for the pH electrode to pass through.

[0010] Preferably, the support rod, the first nut, and the support arm are made of polyethylene.

[0011] Preferably, the outer wall of the support rod is provided with a strip groove, and the side wall of the first nut is provided with a plurality of limiting holes. The pin is inserted into the strip groove through the limiting holes to prevent the first nut from rotating around the support rod.

[0012] Preferably, the length direction of the strip groove is parallel to the axial direction of the support rod, and the strip groove is provided with scale lines.

[0013] Preferably, the length of the support rod is greater than 70mm.

[0014] A pH meter includes an electrode auxiliary support as described above, with a support rod sleeved on the support rod.

[0015] Beneficial Effects: Compared with existing technologies, this utility model has the following advantages: 1. Compatibility with existing pH testers, improving the consistency of test results: The support rod can be directly fitted onto the existing pH measuring instrument's bracket rod. The support rod is a threaded rod. After the tester determines the pH electrode height according to the sample container, they can screw on the nut to fix the height of the support arm, avoiding test errors caused by electrode height and improving the consistency and accuracy of test results; 2. Convenient disassembly and reuse: After the tester determines the measurement height according to the container of a certain sample, it can be used. After the measurement is completed, slide it upward to remove the electrode bracket. When testing the same type of sample again, the electrode bracket can be refitted without affecting the testing of other types of samples. No verification is required before testing, and testing can be performed directly, improving testing efficiency; 3. Made of polyethylene material, avoiding the introduction of other materials such as copper and zinc elements; 4. Using threads, nuts, and limiting holes, it is easy to finely adjust and accurately fix; 5. Increase the stability of the tester's built-in bracket rod: An auxiliary bracket is attached to the bracket rod, increasing the contact area between the bracket rod and the tester. The bottom base of the auxiliary bracket has a slope, which improves the stability of the electrode during the test. Attached Figure Description

[0016] Figure 1 A graph of measurement data from an existing pH meter;

[0017] Figure 2 This is a schematic diagram of the pH tester of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the first embodiment of the present invention;

[0019] Figure 4 This is a side view of the structure of the first embodiment of the present utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the second embodiment of the present invention;

[0021] Figure 6 This is an exploded view of the structure of the second embodiment of this utility model. Detailed Implementation

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0023] Example 1: In the production process of lithium iron phosphate, pH is a very important technical indicator. Our company currently uses a Mettler FE28pH pH meter with a smooth support rod. Under the same operator, using a 50mL Shuniu brand conical flask as the test container and the flask's own graduations as reference lines, the pH was measured sequentially at the 20mL, 30mL, and 40mL graduations. Six parallel tests were performed at each graduation, and the difference between the 20mL and 30mL, and between the 20mL and 40mL graduations (GAP) was calculated. The pH values ​​obtained at different test heights are shown in Table 1. Figure 1 As shown in the data, the results of multiple tests vary greatly, affecting the accuracy of the tests.

[0024] Table 1: Test Results (pH)

[0025]

[0026]

[0027] Using the container's graduation line as a reference, three operators conducted six parallel tests on the same sample using a handheld pH electrode. The test results are shown in Table 2. Using a handheld electrode increases the test error.

[0028] Table 2: Test Results (pH)

[0029]

[0030] Three operators used the support rod provided with the pH meter to record the electrode height by drawing lines with a marker. Six parallel tests were performed on the same sample. Before each test, the electrode height was checked by referring to the drawn lines. The test results are shown in Table 3.

[0031] Table 3: Test Results (pH)

[0032]

[0033] like Figures 2 to 4The electrode auxiliary support of the pH meter mainly consists of a base 1, a support rod 2, a support arm 3, and a nut 4. The base 1 is located at the bottom of the support rod 2. The base 1 and support rod 2 can be an integral or separate structure. Both the base 1 and support rod 2 are cylindrical, with the outer diameter of the base 1 being larger than that of the support rod 2. The base 1 and support rod 2 are coaxial, and a shaft hole 21 with a diameter of not less than 8mm is provided on their axis to facilitate fitting onto the support rod 51 provided with the pH meter 5. The lower surface of the base 1 is beveled to form an inclined surface 11, which can contact the upper surface of the pH meter 5 to ensure that the bottom surface of the support rod 2 is flat, preventing the base 1 from rotating relative to the meter and ensuring the stability of the electrode auxiliary support. To accommodate FE28pH, the inclination angle of the inclined surface 11 is 10–30°. The support rod 2 is a threaded rod with a length of not less than 70mm.

[0034] The support arm 3 is a cuboid with rounded corners. One end of the support arm 3 has a through hole 32 with an inner diameter larger than that of the support rod 2, and the through hole 32 fits onto the support arm 2. The other end has three through holes 31 with an inner diameter larger than that of the glass electrode. These through holes 31 are arranged in a straight line to fix the glass electrode and adjust its position. The length of the support arm 3 is not less than 160mm. Nuts 4 fix the support arm 3 above and below.

[0035] In use, place the base 1 and support rod onto the bracket rod 51 that comes with the pH tester, install the nut 41 onto the support rod 2, adjust the position of the nut 41 according to the target height, then put the support arm 3 onto the support rod 2, and finally put the nut 42 into the bracket rod 51 to fix the height of the support arm 3. Insert the electrode (not shown) into the through hole 32 to perform the test.

[0036] pH meter electrode auxiliary support usage test

[0037] Three people used the electrode auxiliary support of this utility model to measure the pH of the sample after adjusting the height of the support arm according to the container. Six parallel tests were performed on the same sample. The measurement was done directly without checking the electrode height. The test results are shown in Table 4.

[0038] Table 4: Test Results (pH)

[0039]

[0040] In summary, as shown in Tables 1 and 2, using the container's graduation lines as a reference, the test range for the same sample from the same person is approximately 0.2 pH, while the range for three people is >0.25 pH. Using the electrode holder rod provided with the pH meter and marking the lines with a marker, the test range for the same sample from the same person is approximately 0.05 pH, while the range for three people is >0.1 pH, which helps reduce test deviation. Using the auxiliary holder of this invention, the test range for the same sample from the same person is approximately 0.03 pH, while the range for three people is <0.1 pH, further reducing test deviation. Using this method, the test data between different testers are essentially identical, ensuring the stability of the test results. The fixed electrode testing height simplifies operation, eliminates the need for verification, and improves testing efficiency.

[0041] Example 2: Based on Example 1, this example has the following variations:

[0042] There is no support below nut 41. In actual use, the position of nut 41 may deviate slightly from the preset position. To solve this problem, such as... Figure 4 , Figure 5 The support rod 2 has at least one groove 22 along its axial direction. The nut 41 has several limiting holes 411 penetrating the sidewalls around its perimeter or on its upper surface. After the nut 41 is rotated to a preset position, a pin (not shown) is inserted through the limiting hole 411 into the groove 22, preventing the nut 41 from rotating relative to the support rod 21 and ensuring its position remains unchanged. Similarly, the nut 42 can also have limiting holes 421 (not shown). A scale line can be provided inside the groove 22; when no pin is present, the scale line is used to verify the height of the support arm 3. The support arm 3 can have a receiving cavity to accommodate the pin.

Claims

1. An electrode auxiliary support comprising a support rod (2) and a support arm (3) for supporting a pH electrode, which is sleeved on the support rod (2), characterized in that, The support rod (2) is a threaded rod, and the support rod (2) has a shaft hole (21) for fitting onto the tester bracket rod. The support rod on the lower side of the support arm (3) has a first nut (41) for fixing the height of the support arm (3).

2. The electrode assisted stent of claim 1, wherein, The support rod (2) on the upper side of the support arm (3) is provided with a second nut (42) for fixing the support arm (3).

3. The electrode assisted stent of claim 1, wherein, The bottom end of the support rod (2) is provided with an inclined surface (11) that matches the upper surface of the pH tester.

4. The electrode assisted stent of claim 3, wherein, The support rod (2) has a base (1) at its bottom. The outer diameter of the base (1) is larger than the outer diameter of the support rod (2). The inclined surface (11) is located at the bottom of the base (1).

5. The electrode assisted stent of claim 1, wherein, The support arm (3) has a through hole (31) at the end away from the support rod (2) for the pH electrode to pass through.

6. The electrode auxiliary support according to claim 1, characterized in that, The support rod (2), the first nut (41), and the support arm (3) are made of polyethylene.

7. The electrode auxiliary support according to claim 1, characterized in that, The length of the support rod (2) is greater than 70 mm.

8. The electrode auxiliary support according to claim 1, characterized in that, The outer wall of the support rod (2) is provided with a strip groove (22), and the side wall of the first nut (41) is provided with several limiting holes (411). The pin is inserted into the strip groove through the limiting hole to prevent the first nut from rotating around the support rod.

9. The electrode auxiliary support according to claim 8, characterized in that, The length direction of the groove (22) is parallel to the axial direction of the support rod (2), and the groove (22) is provided with scale lines.

10. A pH meter, characterized in that, Includes the electrode-assisted support as described in any one of claims 1 to 9.

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