A thermostated pressureless device and method for measuring the pH of a fluid

Abstract

The application discloses a constant-temperature and pressure-free device and method for measuring fluid pH value, which comprises a support and a shell arranged above the support, the support is fixed above a ditch at a measuring point; the shell is provided with a fluid inlet and a fluid outlet at two ends respectively, the fluid inlet is located at the upper left side of the shell and is provided with an inlet fluid regulating valve, the fluid outlet is located at the lower right side of the shell and is provided with an outlet fluid regulating baffle; a filter sleeve is arranged at the lower end of the fluid inlet, a temperature control coil, a first speed reduction plate, an electrode protection sleeve and a second speed reduction plate are detachably arranged at the upper end of the shell and are spaced from the bottom surface of the shell by a set gap; a temperature regulating valve is arranged on the temperature control coil, and a pH electrode is arranged in the electrode protection sleeve. The application can realize the constant-temperature and pressure-free of the fluid pH measurement environment, reduce the abrasion of the pH electrode, prolong the service life, reduce the cleaning and maintenance cost, and is simple in structure, convenient to operate and suitable for different occasions.

Description

Technical Field

[0001] This invention relates to the field of fluid pH measurement technology, and in particular to a constant temperature and pressureless device and method for measuring fluid pH. Background Technology

[0002] pH values ​​are widely used in thermal power plants, serving as a crucial chemical control indicator across mechanical, electrical, and boiler engineering disciplines. Current measurement methods include online pH meter measurement, sampling test strip measurement, and sampling laboratory instrument testing.

[0003] To obtain the current pH value of a fluid in real time and quickly, online pH meters are commonly used. However, due to the limitations of the pH probe's detection principle, there are certain requirements for the fluid's pressure and temperature. At the same time, the pH probe material also causes significant wear and tear. Therefore, different measuring devices are needed to measure the media in different environments within a thermal power plant. This increased cost and maintenance work also affects the stable and accurate operation of the pH meter. Summary of the Invention

[0004] The purpose of this invention is to provide a constant-temperature, pressureless device and method for measuring the pH value of fluids. This device and method can achieve a pressureless and constant-temperature environment for measuring fluid pH, reduce wear on the pH electrode, extend its service life, reduce cleaning and maintenance costs, and has a simple overall structure and is easy to operate, making it suitable for various occasions.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A constant-temperature, pressureless device for measuring the pH value of a fluid includes: a support frame and a housing mounted on top of the support frame, the support frame being fixed above a trench at the measurement point; the housing has a fluid inlet and a fluid outlet at its two ends, the fluid inlet being located on the upper left side of the housing and equipped with an inlet regulating valve, and the fluid outlet being located on the lower right side of the housing and equipped with an outlet regulating baffle, the outlet regulating baffle being movably connected to the housing for adjusting the size of the fluid outlet; a filter sleeve is provided at the lower end of the fluid inlet, and a temperature control coil, a first-stage speed reduction plate, an electrode casing, and a second-stage speed reduction plate are sequentially arranged between the filter sleeve and the fluid regulating baffle, the temperature control coil, the first-stage speed reduction plate, the electrode casing, and the second-stage speed reduction plate being detachably mounted on the upper end of the housing, with a set gap left from the bottom surface of the housing; a temperature regulating valve is provided on the temperature control coil, and a pH electrode is provided inside the electrode casing.

[0007] Furthermore, the upper ends of the front and rear side walls of the housing are provided with several sets of symmetrical slots, and the temperature control coil, the first-stage speed reduction plate, the electrode sleeve, and the second-stage speed reduction plate are snapped into the slots.

[0008] Furthermore, the upper end of the housing is detachably provided with a cover, which covers the card slot. The cover is either a sealing and heat-insulating type or a breathable and heat-dissipating type.

[0009] Furthermore, the housing is an integrated frustum structure and is made of corrosion-resistant material, and the bottom surface of the housing is inclined from the fluid inlet to the fluid outlet.

[0010] Furthermore, the inlet of the fluid regulating valve is connected to a sampling pipe, and a sampling extension pipe is provided between the fluid regulating valve and the fluid inlet; the fluid regulating valve, the sampling pipe, and the sampling extension pipe are all threadedly connected, and the filter sleeve is threadedly connected to the sampling extension pipe inserted into the fluid inlet and placed inside the housing.

[0011] Furthermore, the distance between the first-stage deceleration plate and the bottom surface of the housing is no more than 30mm, and several circular holes are equally spaced on the first-stage deceleration plate; the distance between the electrode sleeve and the bottom surface of the housing is no less than 50mm, and the electrode sleeve is a double-ended cylinder with an open bottom and a closed top, with a threaded hole at the top of each cylinder, and a pH electrode is installed inside at least one cylinder, with the pH electrode sealed to the threaded hole; the electrode sleeve extends 20mm beyond the probe of the pH electrode, and a 30*30mm window is opened at the lower end of the electrode sleeve, which is higher than the pH electrode probe, and the window faces the fluid regulating baffle; the distance between the second-stage deceleration plate and the bottom of the housing is no less than 40mm.

[0012] Furthermore, the horizontal distance between the temperature control coil and the filter sleeve is 100mm, the horizontal distance between the first-stage speed reduction plate and the temperature control coil is 100mm, the horizontal distance between the electrode sleeve and the first-stage speed reduction plate is 120mm, and the horizontal distance between the second-stage speed reduction plate and the electrode sleeve is 120mm.

[0013] The present invention also discloses a method for measuring the pH value of a fluid, applied to the above-mentioned isothermal and pressureless device for measuring the pH value of a fluid, comprising the following steps:

[0014] S1. Install a fixed bracket and housing above the trench at the on-site measuring point to ensure that the entire device is in a horizontal position. Freely combine and select the temperature control coil, first-stage speed reduction plate, electrode casing, and second-stage speed reduction plate to install in the slot at the top of the housing, and keep them in a vertical position.

[0015] S2, open the inlet fluid regulating valve, and the fluid enters the filter sleeve through the fluid inlet to filter insoluble impurities;

[0016] S3, the fluid enters the housing after passing through the filter sleeve. The fluid is already in a depressurized state. The temperature of the fluid is regulated by the temperature control coil. The temperature control coil can introduce steam or ice water to heat or cool the fluid in the housing according to the measurement requirements. The temperature control valve achieves controllable heating or cooling temperature by controlling the flow rate of the medium entering the temperature control coil. At the same time, with the cooperation of the sealed heat-insulating type or the ventilated heat dissipation type cover, the fluid temperature is kept constant and suitable for pH electrode operation.

[0017] S4. The constant temperature and pressureless fluid formed after treatment is slowed down for the first time through the round hole of the first-stage deceleration plate. After passing through the first-stage deceleration plate, the fluid then passes through the electrode casing. The opening of the electrode casing faces the fluid regulating baffle, allowing the fluid to freely flow in from the bottom of the electrode casing and then out from the window, reducing fluid wear on the electrode and ensuring that the fluid continuously and fully contacts the pH electrode probe before flowing to the second-stage deceleration plate. The first-stage and second-stage deceleration plates work together to achieve an overall stable fluid state.

[0018] S5, the fluid flows out from the bottom of the secondary deceleration plate, passes through the outflow regulating baffle and flows into the trench. The outflow regulating baffle and the inflow regulating valve work together to ensure that the liquid level in the housing is not lower than 2 / 3 of the electrode sleeve window, so that the pH electrode is always immersed in the fluid.

[0019] Furthermore, step S1 also includes connecting the inlet fluid regulating valve to the sampling pipe and connecting the filter sleeve to the sampling extension pipe inserted into the fluid inlet.

[0020] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects: The constant temperature and pressureless device and method for measuring the pH value of fluids provided by the present invention optimizes and transforms the original installation form and measurement method. The original closed pipeline or tank measuring device is replaced with an open, detachable flow pool structure. A filter sleeve, a temperature control coil, a first-stage speed reduction plate, an electrode sleeve, and a second-stage speed reduction plate are sequentially arranged inside the shell. The temperature control coil and temperature regulating valve realize the pressureless and constant temperature environment for fluid pH measurement. The speed reduction plate and the electrode sleeve can reduce the wear of the pH electrode by the fluid and extend its service life. The outflow regulating baffle and the inflow regulating valve work together to ensure that the liquid level in the shell is not lower than 2 / 3 of the window of the electrode sleeve, ensuring that the pH electrode is always immersed in the fluid and ensuring measurement accuracy. In addition, the bottom surface of the shell is in a downward tilted state, so that sediment can be discharged automatically when measuring the pH value of turbid fluids, reducing cleaning and maintenance costs, and is suitable for various fluid pH measurement environments. The overall device has a simple design, a compact structure, is easy to arrange and install, and is easy to use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the isothermal pressureless device for measuring the pH value of fluids according to the present invention;

[0023] Figure 2 This is a schematic diagram showing the disassembly and assembly of the housing and cover of the present invention;

[0024] Figure 3 This is a schematic diagram of the installation structure of the fluid inlet regulating valve and filter sleeve structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the temperature control coil structure of the present invention;

[0026] Figure 5a This is a schematic diagram of the first-stage deceleration plate structure of the present invention;

[0027] Figure 5b This is a schematic diagram of the two-stage deceleration plate structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the electrode sleeve of the present invention;

[0029] Figure 7 This is a schematic diagram of the installation structure of the first-stage deceleration plate, electrode sleeve junction, and second-stage deceleration plate of the present invention.

[0030] Reference numerals: 1. Bracket; 2. Housing; 3. Inlet fluid regulating valve; 4. Filter sleeve; 5. Temperature regulating valve; 6. Temperature control coil; 7. First-stage speed reducer; 8. Electrode casing; 9. Second-stage speed reducer; 10. Outlet fluid regulating baffle; 11. pH electrode; 12. Cap; 13. Fluid inlet; 14. Fluid outlet; 15. Slot; 16. Trench; 17. Sampling pipe; 18. Sampling extension pipe; 19. Threaded hole; 20. Window. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The purpose of this invention is to provide a constant-temperature, pressureless device and method for measuring the pH value of fluids. This device and method can achieve a pressureless and constant-temperature environment for measuring fluid pH, reduce wear on the pH electrode, extend its service life, reduce cleaning and maintenance costs, and has a simple overall structure and is easy to operate, making it suitable for various occasions.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1-7 As shown, the constant temperature and pressureless device for measuring the pH value of fluid provided by the present invention is a detachable flow cell structure. The device includes a support 1 and a housing 2 disposed above the support 1. The support 1 is fixed above the trench 16 at the on-site measurement point. The housing 2 has a fluid inlet 13 and a fluid outlet 14 at its two ends. The fluid inlet 13 is located on the upper left side of the housing 2 and is equipped with an inlet regulating valve 3. The fluid outlet 14 is located on the lower right side of the housing 2 and is equipped with an outlet regulating baffle 10. The device utilizes the two sides of the fluid outlet 14 in the housing 2... An internal slot allows the fluid outlet regulating baffle 10 to slide into the housing 2, creating a sealed open space around the housing 2. By manually raising or lowering the depth of the fluid outlet regulating baffle 10 inserted into the housing 2, the fluid outlet 14 formed by the fluid outlet regulating baffle 10 and the bottom of the housing 2 can be enlarged or reduced, thereby regulating the flow rate of the fluid outlet 14. A filter sleeve 4 is provided at the lower end of the fluid inlet 13. Between the filter sleeve 4 and the fluid outlet regulating baffle 10, a temperature control coil 6, a first-stage speed reduction plate 7, an electrode sleeve 8, and a second-stage speed reduction plate 9 (e.g., ...) are sequentially arranged. Figure 5b As shown, the temperature control coil 6, the first-stage speed reduction plate 7, the electrode casing 8, and the second-stage speed reduction plate 9 are detachably mounted on the upper end of the housing 2, and a set gap is left between them and the bottom surface of the housing 2; a temperature regulating valve 5 is provided on the temperature control coil 6, and a pH electrode 11 is provided inside the electrode casing 8.

[0035] like Figure 2 As shown, the upper ends of the front and rear side walls of the housing 2 are provided with several sets of symmetrical slots 15, and the temperature control coil 6, the first-stage speed reduction plate 7, the electrode sleeve 8, and the second-stage speed reduction plate 9 are snapped into the slots 15. The upper end of the housing 2 is detachably provided with a cover 12, which covers the slots 15. The cover 12 is either a sealed and heat-insulating type or a breathable and heat-dissipating type.

[0036] like Figure 1 and Figure 2 As shown, the housing 2 is an integrated frustum structure and is made of corrosion-resistant material. The bottom surface of the housing 2 is inclined from the fluid inlet 13 to the fluid outlet 14, for example, the inclination angle is 15° with the horizontal.

[0037] like Figure 1 and Figure 3 As shown, the inlet of the fluid regulating valve 3 is connected to a sampling pipe 17, and a sampling extension pipe 18 is provided between the fluid regulating valve 3 and the fluid inlet 13; the fluid regulating valve 3 is threadedly connected to both the sampling pipe 17 and the sampling extension pipe 18, and the filter sleeve 4 is threadedly connected to the sampling extension pipe 18 inserted into the fluid inlet 13 and placed inside the housing 2.

[0038] The distance H1 between the first-stage deceleration plate 7 and the bottom surface of the housing 2 is no more than 30mm, and several circular holes are equally spaced on the first-stage deceleration plate 7, such as... Figure 5a As shown; Figure 6 As shown, the electrode sleeve 8 has a double-cylinder design. The top of the two cylinders are connected side by side by a cover plate, and the width of the cover plate matches the slot 15 of the housing 2. At the same time, it can seal the top of the two cylinders. The length matches the width of the housing 2. The bottom of the two cylinders is not closed, so that when the entire electrode sleeve 8 is placed in the housing 2, the two cylinders can be in a vertical state. The distance H2 between the electrode sleeve 8 and the bottom surface of the housing 2 is not less than 50 mm. The top of the electrode sleeve 8 has a threaded hole 19 corresponding to the position of the cylinder, and each threaded hole 19 is located at the center of the cylinder. One PH electrode 11 can be set in each of the two cylinders at the same time, or one PH electrode 11 can be set in either cylinder according to actual needs. The PH electrode 11 is sealed to the threaded hole 19. The probe length H of the electrode sleeve 8 beyond the PH electrode 11 is 20 mm. The electrode casing 8 has a 30*30mm window 20 at the lower end of each of its two cylindrical sections. The windows 20 are located at the same position on both cylinders, specifically in the positive direction where the side length d is 30mm, and are higher than the pH electrode 11 probe. The windows 20 face the fluid regulating baffle 10. The secondary deceleration plate 9 is at least 40mm away from the bottom of the casing 2 at a distance H3. Figure 7 As shown.

[0039] like Figure 1 As shown, the horizontal distance A between the temperature control coil 6 and the filter sleeve 4 is 100mm, the horizontal distance B between the first-stage speed reduction plate 7 and the temperature control coil 6 is 100mm, the horizontal distance C between the electrode sleeve 8 and the first-stage speed reduction plate 7 is 120mm, and the horizontal distance D between the second-stage speed reduction plate 9 and the electrode sleeve 8 is 120mm.

[0040] The present invention also discloses a method for measuring the pH value of a fluid, applied to the above-mentioned isothermal and pressureless device for measuring the pH value of a fluid, comprising the following steps:

[0041] S1. Install a fixed bracket 1 and a housing 2 above the trench 16 at the field measurement point, so that the whole device is in a horizontal state on the center plane. Connect the inlet fluid regulating valve 3 to the sampling pipe 17, and connect the filter sleeve 4 to the sampling extension pipe 18 inserted into the fluid inlet 13. Freely combine and select the temperature control coil 6, the first-stage speed reduction plate 7, the electrode sleeve 8, and the second-stage speed reduction plate 9 and install them in the slot 15 at the upper end of the housing 2, and keep them in a vertical state.

[0042] S2, open the inlet fluid regulating valve 3, and the fluid enters the filter sleeve 4 through the fluid inlet 13 to filter insoluble impurities; the filter holes of the filter sleeve 4 can be replaced according to the actual fluid impurities, and can be disassembled for cleaning;

[0043] S3, the fluid that has passed through the filter sleeve 4 enters the housing 2. The fluid is already in a depressurized state. The temperature of the fluid is regulated by the temperature control coil 6. The temperature control coil 6 can introduce steam or ice water to heat or cool the fluid in the housing 2 according to the measurement requirements. The temperature control valve 5 controls the flow rate of the medium entering the temperature control coil 6 to achieve controllable heating or cooling temperature. At the same time, it works with the sealed heat-insulating or ventilated heat dissipation type cover 12 to ensure that the fluid temperature is constant and suitable for the operation of the pH electrode 11.

[0044] S4. The constant temperature and pressureless fluid formed after treatment is decelerated for the first time through the round hole of the first-stage deceleration plate 7. The first-stage deceleration plate 7 with different hole diameters is suitable for different flow rate environments and can be selected according to actual needs. The fluid passing through the first-stage deceleration plate 7 then passes through the electrode sleeve 8. The direction of the opening window 20 of the electrode sleeve 8 is towards the fluid regulating baffle 10, so that the fluid can freely flow in from the bottom of the electrode sleeve 8 and then flow out from the window 20, reducing the wear of the fluid on the pH electrode 11 and ensuring that the fluid continuously and fully contacts the pH electrode 11 probe, and flows to the second-stage deceleration plate 9. The first-stage deceleration plate 7 and the second-stage deceleration plate 9 work together to achieve an overall stable fluid state.

[0045] S5, the fluid flows out from the bottom of the secondary deceleration plate 9, passes through the outflow regulating baffle 10, and flows into the trench 16. The outflow regulating baffle 10 and the inflow regulating valve 3 work together to ensure that the liquid level in the housing 2 is not lower than 2 / 3 of the window 20 of the electrode casing 8, so that the pH electrode 11 is always immersed in the fluid.

[0046] The present invention provides a constant-temperature, pressureless device and method for measuring the pH value of fluids. It optimizes and modifies existing installation methods and measurement techniques, replacing the original closed pipe or tank measuring device with an open flow-through pool. A temperature control coil and temperature regulating valve are added to achieve a pressureless and constant-temperature environment for fluid pH measurement, preventing instrument damage and inaccurate measurements. The speed-reducing plate and electrode sleeve reduce wear on the pH electrode, extending its service life. The frustum-shaped shell design, with its bottom surface tilted downwards, allows sediment to be automatically discharged when measuring the pH value of turbid fluids, reducing cleaning and maintenance costs. The overall device is simple in design and compact in structure, facilitating installation. The filter sleeve, temperature control coil, first-stage speed-reducing plate, and cap can be freely combined and disassembled, offering flexible use and applicability to various fluid pH measurement environments.

[0047] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A constant-temperature, pressureless device for measuring the pH value of a fluid, characterized in that, include: The support (1) and the housing (2) are mounted on top of the support (1). The support (1) is fixed above the trench (16) at the field measurement point. The housing (2) has a fluid inlet (13) and a fluid outlet (14) at its two ends. The fluid inlet (13) is located on the upper left side of the housing (2) and is equipped with an inlet regulating valve (3). The fluid outlet (14) is located on the lower right side of the housing (2) and is equipped with an outlet regulating baffle (10). The outlet regulating baffle (10) is movably connected to the housing (2) and is used to adjust the size of the fluid outlet (14). The lower end of the fluid inlet (13) is provided with a filter sleeve (4). Between the filter sleeve (4) and the fluid regulating baffle (10), a temperature control coil (6), a first-stage speed reduction plate (7), an electrode sleeve (8), and a second-stage speed reduction plate (9) are arranged in sequence. The temperature control coil (6), the first-stage speed reduction plate (7), the electrode sleeve (8), and the second-stage speed reduction plate (9) are detachably arranged at the upper end of the housing (2), and a set gap is left between them and the bottom surface of the housing (2). A temperature regulating valve (5) is provided on the temperature control coil (6), and a pH electrode (11) is provided inside the electrode sleeve (8). The distance between the first-stage deceleration plate (7) and the bottom surface of the housing (2) is no more than 30mm, and several circular holes are equally spaced on the first-stage deceleration plate (7); the distance between the electrode sleeve (8) and the bottom surface of the housing (2) is no less than 50mm, and the electrode sleeve (8) is a double-ended cylinder with an open bottom and a closed top, with a threaded hole (19) at the top of each cylinder, and a pH electrode (11) is provided in at least one cylinder, the pH electrode (11) is sealed to the threaded hole (19), the electrode sleeve (8) extends 20mm beyond the probe length of the pH electrode (11), and a 30*30mm window (20) is opened at the lower end of the electrode sleeve (8), which is higher than the pH electrode (11) probe, and the direction of the window (20) is towards the fluid regulating baffle (10); the distance between the second-stage deceleration plate (9) and the bottom of the housing (2) is no less than 40mm.

2. The isothermal pressureless device for measuring the pH value of a fluid according to claim 1, characterized in that, The upper ends of the front and rear side walls of the housing (2) are provided with several sets of symmetrical slots (15), and the temperature control coil (6), the first-stage speed reduction plate (7), the electrode sleeve (8), and the second-stage speed reduction plate (9) are snapped into the slots (15).

3. The isothermal pressureless device for measuring the pH value of a fluid according to claim 2, characterized in that, The upper end of the housing (2) is detachably provided with a cover (12), which covers the card slot (15) and is either a sealed and heat-insulating type or a breathable and heat-dissipating type.

4. The isothermal pressureless device for measuring the pH value of a fluid according to claim 1, characterized in that, The shell (2) is an integrated frustum structure and is made of corrosion-resistant material. The bottom surface of the shell (2) is inclined from the fluid inlet (13) to the fluid outlet (14).

5. The isothermal pressureless device for measuring the pH value of a fluid according to claim 1, characterized in that, The inlet of the fluid regulating valve (3) is connected to a sampling pipe (17), and a sampling extension pipe (18) is provided between the fluid regulating valve (3) and the fluid inlet (13); the fluid regulating valve (3) is threadedly connected to the sampling pipe (17) and the sampling extension pipe (18), and the filter sleeve (4) is threadedly connected to the sampling extension pipe (18) inserted into the fluid inlet (13) and placed inside the housing (2).

6. The isothermal pressureless device for measuring the pH value of a fluid according to claim 1, characterized in that, The horizontal distance between the temperature control coil (6) and the filter sleeve (4) is 100mm, the horizontal distance between the first-stage speed reduction plate (7) and the temperature control coil (6) is 100mm, the horizontal distance between the electrode sleeve (8) and the first-stage speed reduction plate (7) is 120mm, and the horizontal distance between the second-stage speed reduction plate (9) and the electrode sleeve (8) is 120mm.

7. A method for measuring the pH value of a fluid, applied to the isothermal and pressureless apparatus for measuring the pH value of a fluid as described in any one of claims 1-6, characterized in that, Includes the following steps: S1, Install a fixed bracket (1) and a housing (2) above the trench (16) at the field measurement point, so that the whole device is in a horizontal state on the center plane. Freely combine and select the temperature control coil (6), the first-stage speed reduction plate (7), the electrode sleeve (8), and the second-stage speed reduction plate (9) and install them in the slot (15) at the upper end of the housing (2), and in a vertical state. S2, open the inlet fluid regulating valve (3), and the fluid enters the filter sleeve (4) through the fluid inlet (13) to filter insoluble impurities; S3, the fluid that passes through the filter sleeve (4) enters the shell (2). The fluid is in a depressurized state. The temperature of the fluid is regulated by the temperature control coil (6). The temperature control coil (6) can introduce steam or ice water to heat or cool the fluid in the shell (2) according to the measurement requirements. The temperature control valve (5) controls the flow rate of the medium entering the temperature control coil (6) to achieve controllable heating or cooling temperature. At the same time, it is used in conjunction with a sealed heat-insulating type or a breathable heat dissipation type cover (12) to ensure that the fluid temperature is constant and suitable for the operation of the pH electrode (11). S4, the constant temperature and pressureless fluid formed after processing is decelerated for the first time through the round hole of the first-stage deceleration plate (7). The fluid passing through the first-stage deceleration plate (7) then passes through the electrode sleeve (8). The direction of the opening window (20) of the electrode sleeve (8) is towards the fluid regulating baffle (10), so that the fluid can freely flow in from the bottom of the electrode sleeve (8) and then flow out from the window (20), reducing the wear of the fluid on the pH electrode (11) and making the fluid continuously and fully contact the pH electrode (11) probe, flowing to the second-stage deceleration plate (9). The first-stage deceleration plate (7) and the second-stage deceleration plate (9) work together to achieve a stable overall fluid state. S5, the fluid flows out from the bottom of the secondary deceleration plate (9), passes through the outflow regulating baffle (10), and flows into the trench (16). The outflow regulating baffle (10) and the inflow regulating valve (3) work together to ensure that the liquid level in the housing (2) is not lower than 2 / 3 of the window (20) of the electrode casing (8), so that the pH electrode (11) is always immersed in the fluid.

8. The method for measuring the pH value of a fluid according to claim 7, characterized in that, In step S1, the fluid inlet regulating valve (3) is connected to the sampling pipe (17), and the filter sleeve (4) is connected to the sampling extension pipe (18) inserted into the fluid inlet (13).

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