Measuring device and measuring method for measuring pH value of water sample

Abstract

The invention discloses a measuring device and method for measuring the PH value of a water sample, the measuring device for measuring the PH value of the water sample comprises a water sample bottle, a sampling assembly and a measuring assembly, the water sample bottle comprises a bottle body and a cover body connected with the bottle body in a sealed mode, and the sampling assembly comprises a water sample pipe and a gas conveying pipe; one end of the water sample pipe and one end of the gas conveying pipe both penetrate through the cover body and extend into the bottle body, the other end of the gas conveying pipe is used for inputting inert gas, a gas inlet / outlet valve is arranged on the gas conveying pipe, a water inlet / outlet valve is arranged on the water sample pipe, the measuring assembly comprises a measuring pool and a PH meter, the measuring pool is detachably communicated with the other end of the water sample pipe, and the PH meter is arranged in the measuring pool. And the PH meter extends into the measuring cell. According to the measuring device for measuring the pH value of the water sample, the sealing performance of the water sample in the process from sampling to measuring is guaranteed, carbonic acid substances influencing the measuring precision can be prevented from being generated due to the fact that CO2 makes contact with the water sample, and the measuring accuracy is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of water quality testing equipment technology, specifically to a measuring device and method for measuring the pH value of a water sample. Background Technology

[0002] As the capacity and parameters of individual thermal power plants increase, the requirements for the quality of their steam and water are also becoming increasingly stringent. This is especially true for supercritical and ultra-supercritical units, where the quality of steam and water in the makeup water system, feedwater system, and steam system is close to that of pure water. However, when measuring the pH value of pure water in the laboratory, external air becomes the most significant interfering factor. The mechanism primarily stems from the carbonic acid ionization equilibrium system formed after CO2 dissolves in water, which significantly lowers the pH value and leads to unstable and drifting readings.

[0003] Therefore, how to eliminate air interference during pH measurement has become an urgent technical problem to be solved. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention provide a measuring device for measuring the pH value of a water sample. This measuring device ensures the airtightness of the water sample from sampling to measurement, thereby preventing CO2 from contacting the water sample and generating carbonates that affect the measurement accuracy, thus ensuring the accuracy of the measurement.

[0006] Embodiments of the present invention also provide a measurement method for a measuring device for measuring the pH value of a water sample.

[0007] A measuring device for measuring the pH value of a water sample according to an embodiment of the present invention includes: a water sample bottle, the water sample bottle including a bottle body and a cap sealed to the bottle body; a sampling assembly including a water sample tube and a gas delivery tube, one end of the water sample tube and one end of the gas delivery tube passing through the cap and extending into the bottle body, the other end of the gas delivery tube being used to input inert gas and having an inlet / outlet valve on the gas delivery tube, and an inlet / outlet water valve on the water sample tube; and a measuring assembly including a measuring cell and a pH meter, the measuring cell being detachably connected to the other end of the water sample tube, and the pH meter extending into the measuring cell.

[0008] The device for measuring the pH value of water samples according to this invention includes a water sample bottle comprising a sealed bottle body and a cap. One end of a water sample tube extends into the bottle body, and the other end is connected to a measuring cell. One end of a gas delivery tube extends into the bottle body, and the other end is through which an inert gas is introduced. Thus, the gas delivery tube can change the gas pressure inside the water sample bottle by introducing inert gas, thereby pushing the water sample through the water sample tube into the measuring cell for pH measurement. Before the water sample is collected, the air inside the bottle can also be purged using inert gas to ensure that there is no air inside the bottle. This prevents the water sample from coming into contact with air during the sampling and measurement process, thereby avoiding the formation of carbon dioxide that would affect the measurement accuracy due to contact between CO2 and the water sample, and ensuring measurement accuracy.

[0009] In some embodiments, the gas delivery pipe is further provided with a solenoid valve and a throttling orifice plate, the solenoid valve being located on the side of the throttling orifice plate facing the inlet of the gas delivery pipe.

[0010] In some embodiments, the end of the water sample tube extending into the water sample bottle is adjacent to the bottom of the bottle body, and the end of the gas delivery tube extending into the water sample bottle is adjacent to the cap.

[0011] In some embodiments, the pH composite electrode and the measuring cell are filled with a sealing material.

[0012] The present invention relates to a method for measuring the pH value of a water sample using a measuring device described in the above embodiments. The measuring device is the same as described in the previous embodiments. The method includes: Clean the water sample bottle, pipelines, and measuring cell with distilled water; Expel the water and air from the water sample bottle to empty it; Connect the water sample tube to the water sampling outlet to collect a water sample; Connect the water sample tube to the measuring pool and drain the water sample into the measuring pool for pH measurement.

[0013] The measurement method of the measuring device for measuring the pH value of water samples in this embodiment of the invention can ensure absolute sealing during the water sample collection and measurement process, with no contact between air and water sample, thereby ensuring measurement accuracy.

[0014] In some embodiments, the process of draining the water and air from the water sample bottle to empty the bottle includes: filling the water sample bottle with distilled water; opening the inlet / outlet valve and the outlet valve, introducing inert gas to force the distilled water out of the water sample bottle, and closing the inlet / outlet valve and the outlet valve after the distilled water has been drained.

[0015] In some embodiments, connecting the water sample tube to the sampling water outlet to extract the water sample includes: stopping the inert gas supply, and opening the water supply valve, the air inlet / outlet valve, and the water inlet / outlet valve after the sampling tube is connected to the sampling water outlet.

[0016] In some embodiments, connecting the water sample tube to the measuring pool and draining the water sample into the measuring pool for pH measurement includes: closing the water supply valve, the inlet / outlet valve, and the inlet / outlet valve; disconnecting the water sample tube from the sampling water outlet; and connecting the water sample tube to the measuring pool.

[0017] In some embodiments, the measurement method of the measuring device for measuring the pH value of a water sample further includes: opening the inlet / outlet valve and the inlet / outlet valve, and introducing inert gas to pressurize the water sample into the measuring cell.

[0018] In some embodiments, the measurement method of the measuring device for measuring the pH value of a water sample further includes: observing the value displayed on the pH meter, automatically recording and displaying the current pH value after the value stabilizes; after the measurement is completed, closing the inlet / outlet valve and the inlet / outlet valve, draining the remaining water sample from the water sample bottle, and rinsing the measuring pool and pipeline with distilled water to ensure the system is clean. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a measuring device for measuring the pH value of a water sample according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the sampling of a water sample bottle in a water sample measuring device according to an embodiment of the present invention.

[0021] Figure label: 1. Water sample bottle, 2. Gas delivery pipe, 3. Solenoid valve, 4. Orifice plate, 5. Water sample tube, 6. Inlet / outlet valve, 7. Measuring cell, 8. pH meter, 9. Inlet, 10. Outlet. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] like Figures 1 to 2 As shown, the measuring device for measuring the pH value of a water sample according to an embodiment of the present invention includes a water sample bottle 1, a sampling component, and a measuring component.

[0024] Specifically, the water sample bottle 1 includes a bottle body and a cap that is sealed to the bottle body. The sampling assembly includes a water sample tube 5 and a gas delivery tube 2. One end of the water sample tube 5 and one end of the gas delivery tube 2 pass through the cap and extend into the bottle body. The other end of the gas delivery tube 2 is used to input inert gas and is equipped with an inlet / outlet valve 6. The water sample tube 5 is equipped with an inlet / outlet water valve 7. The measuring assembly includes a measuring cell 8 and a pH meter 9. The measuring cell 8 is detachably connected to the other end of the water sample tube 5, and the pH meter 9 extends into the measuring cell 8.

[0025] Understandably, the sealed cap and bottle body ensure that after the water sample is collected, external air cannot come into contact with the water sample. The gas delivery tube 2 can change the air pressure inside the water sample bottle 1 by introducing inert gas, thereby pushing the water sample through the water sample tube 5 into the measuring cell 8 for pH measurement. Before the water sample is collected, inert gas can also be used to purge the air inside the bottle to ensure that there is no air inside the bottle. This ensures that the water sample will not come into contact with air during the process from sampling to measurement, thereby avoiding the formation of carbon dioxide that affects the measurement accuracy by contacting the water sample with CO2, thus ensuring the measurement accuracy.

[0026] The measuring device for measuring the pH value of water samples according to this embodiment of the invention includes a water sample bottle 1 comprising a sealed bottle body and a cap. One end of a water sample tube 5 extends into the bottle body, and the other end is connected to a measuring cell 8. One end of a gas delivery tube 2 extends into the bottle body, and the other end is through which an inert gas is introduced. Thus, the gas delivery tube 2 can change the gas pressure inside the water sample bottle 1 by introducing inert gas, thereby pushing the water sample through the water sample tube 5 into the measuring cell 8 for pH measurement. Before the water sample is collected, the air inside the bottle can also be purged using inert gas to ensure that there is no air inside the bottle. This prevents the water sample from coming into contact with air during the sampling and measurement process, thereby avoiding the formation of carbon dioxide that affects the measurement accuracy by contacting the water sample with CO2, thus ensuring the measurement accuracy.

[0027] In some embodiments, such as Figure 1 As shown, the gas delivery pipe 2 is also equipped with a solenoid valve 3 and a throttling orifice plate 4. The solenoid valve 3 is located on the side of the throttling orifice plate 4 facing the inlet of the gas delivery pipe 2. Specifically, the solenoid valve 3 is electrically connected to the pH meter 9. When the pH meter 9 starts measuring, it can control the solenoid valve 3 to open, and the inert gas is slowly introduced into the sampling bottle through the throttling orifice plate 4, so that the water sample flows through the measuring cell 8. By using inert gas and the throttling orifice plate 4 to drive the water sample flow, it is possible to ensure that the water sample flows uniformly and stably through the measuring cell 8, thereby improving the measurement accuracy.

[0028] Furthermore, the measuring pool 8 includes an inlet 10 and an outlet 11. The inlet 10 is connected to the water sample tube 5 for receiving water samples, and the outlet 11 is used to discharge wastewater.

[0029] Furthermore, such as Figure 1 As shown, the drain outlet 11 is higher than the inlet 10 to ensure that the measuring pool 8 can store enough water sample.

[0030] Furthermore, the pH meter 9 has an external display screen for direct reading of measurement values.

[0031] In some embodiments, the end of the water sample tube 5 extending into the water sample bottle 1 is close to the bottom of the bottle, and the end of the gas delivery tube 2 extending into the water sample bottle 1 is close to the cap. In other words, the end of the water sample tube 5 is inserted to the bottom of the bottle, and the gas delivery tube 2 extends slightly beyond the cap, so that the water sample can be completely drained when discharged, and at the same time, it is convenient for inert gas to directly compress the water sample from the upper space of the water sample for stable delivery.

[0032] Furthermore, such as Figure 1 As shown, the pH composite electrode and the measuring cell 8 are filled with a sealing material. This ensures the airtightness of the measuring components, thereby preventing the water sample from coming into contact with external air during the entire collection and measurement process, thus guaranteeing measurement accuracy.

[0033] Optionally, both the gas delivery tube 2 and the water sample tube 5 are flexible tubes.

[0034] The measurement method of the measuring device for measuring the pH value of a water sample according to the present invention includes: firstly, cleaning the water sample bottle 1, all pipes, and the measuring pool 8 with distilled water; then, draining the water and air from the water sample bottle 1 to empty it; next, connecting the water sample tube 5 to the sampling water outlet to extract the water sample; and finally, connecting the water sample tube 5 to the measuring pool 8 and draining the water sample into the measuring pool 8 for pH measurement.

[0035] The measurement method of the measuring device for measuring the pH value of water samples in this embodiment of the invention can ensure absolute sealing during the water sample collection and measurement process, with no contact between air and water sample, thereby ensuring measurement accuracy.

[0036] Furthermore, to empty the water and air from sample bottle 1, the process involves: first filling sample bottle 1 with distilled water; then opening the inlet / outlet valve 6 and the inlet / outlet valve 7 to introduce inert gas, forcing the distilled water out of sample bottle 1; and finally closing the inlet / outlet valve 6 and the inlet / outlet valve 7 after the distilled water has been completely drained. Thus, after the inert gas forces the distilled water out, only inert gas remains in the bottle. Closing the inlet / outlet valve 6 and the inlet / outlet valve 7 ensures the bottle remains filled with inert gas, meaning there is no air inside. Additionally, during the emptying process, it is necessary to continue venting for a period of time after the distilled water has been drained to ensure that all water has been removed.

[0037] Furthermore, connecting the water sample tube 5 to the sampling water outlet to extract the water sample includes: stopping the inert gas supply, opening the water supply valve, the inlet / outlet valve 6, and the inlet / outlet valve 7 after connecting the sampling tube to the sampling water outlet. Thus, water can be delivered into the bottle through the sampling water outlet along the water sample tube 5, and the inert gas inside the bottle will be discharged through the gas delivery tube 2 under the pressure of the water.

[0038] Further, connecting the water sample tube 5 to the measuring cell 8 and draining the water sample into the measuring cell 8 for pH measurement includes: closing the water supply valve, inlet / outlet valve 6, and inlet / outlet valve 7; disconnecting the water sample tube 5 from the sampling water outlet; and then connecting the water sample tube 5 to the measuring cell 8. As the water sample is continuously transported along the water sample tube 5 into the water sample bottle 1, the water volume in the water sample bottle 1 will gradually accumulate to a preset value. After the accumulation is complete, close the water supply valve, inlet / outlet valve 6, and inlet / outlet valve 7. At this point, only inert gas and water sample exist in the water sample bottle 1. After disconnecting the water sample tube 5 from the sampling water outlet, the water sample collection is complete. Finally, connect the water sample tube 5 to the measuring cell 8 to prepare for subsequent measurement work.

[0039] Furthermore, by opening the inlet / outlet valve 6 and the inlet / outlet water valve 7, inert gas is introduced to pressurize the water sample into the measuring cell 8. Thus, the introduction of inert gas can compress the water sample from the top, causing it to be transported through the water sample tube 5 into the measuring cell 8, where the pH meter 9 can measure the water sample.

[0040] Further, observe the value displayed on pH meter 9. Once the value stabilizes, automatically record and display the current pH value. After the measurement is completed, close the inlet / outlet valve 6 and the inlet / outlet water valve 7, drain the remaining water sample from water sample bottle 1, and rinse the measuring cell 8 and pipeline with distilled water to ensure the system is clean.

[0041] Furthermore, after the measurement is completed, remove the pH meter 9 and clean the electrode head with deionized water. Regularly check the status of the pH meter 9 to maintain measurement accuracy.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A measuring device for measuring the pH value of a water sample, characterized in that, include: A water sample bottle, the water sample bottle comprising a bottle body and a cap that is sealed to the bottle body; The sampling assembly includes a water sample tube and a gas delivery tube. One end of the water sample tube and one end of the gas delivery tube pass through the cap and extend into the bottle. The other end of the gas delivery tube is used to input inert gas and is equipped with an inlet / outlet valve. The water sample tube is equipped with an inlet / outlet valve. The measuring assembly includes a measuring cell and a pH meter, the measuring cell being detachably connected to the other end of the water sample tube, and the pH meter extending into the measuring cell.

2. The measuring device for measuring the pH value of a water sample according to claim 1, characterized in that, The gas delivery pipe is also equipped with a solenoid valve and a throttling orifice plate, with the solenoid valve located on the side of the throttling orifice plate facing the inlet of the gas delivery pipe.

3. The measuring device for measuring the pH value of a water sample according to claim 1, characterized in that, The end of the water sample tube that extends into the water sample bottle is adjacent to the bottom of the bottle body, and the end of the gas delivery tube that extends into the water sample bottle is adjacent to the cap.

4. The measuring device for measuring the pH value of a water sample according to claim 1, characterized in that, The pH composite electrode and the measuring cell are filled with a sealing material.

5. A measurement method for a device for measuring the pH value of a water sample, characterized in that, The measuring device for measuring the pH value of a water sample is the measuring device for measuring the pH value of a water sample according to any one of claims 1-4, and the measuring method includes: Clean the water sample bottle, pipelines, and measuring cell with distilled water; Expel the water and air from the water sample bottle to empty it; Connect the water sample tube to the water sampling outlet to collect a water sample; Connect the water sample tube to the measuring pool and drain the water sample into the measuring pool for pH measurement.

6. The measurement method of the measuring device for measuring the pH value of a water sample according to claim 5, characterized in that, The process of draining water and air from the water sample bottle to empty the bottle includes: Fill the water sample bottle with distilled water; Open the inlet / outlet valve and the water inlet / outlet valve, and introduce inert gas to force distilled water out of the water sample bottle. After the distilled water is drained, close the inlet / outlet valve and the water inlet / outlet valve.

7. The measurement method of the measuring device for measuring the pH value of a water sample according to claim 6, characterized in that, The step of connecting the water sample tube to the sampling water outlet to extract the water sample includes: After the inert gas supply is stopped, the water supply valve, air inlet / vent valve, and water inlet / outlet valve are opened after the sampling tube is connected to the sampling water inlet.

8. The measurement method of the measuring device for measuring the pH value of a water sample according to claim 7, characterized in that, The step of connecting the water sample tube to the measuring pool and discharging the water sample into the measuring pool for pH measurement includes: Close the water supply valve, air inlet / vent valve, and water inlet / outlet valve, and disconnect the water sample tube from the water sampling port; Connect the water sample tube to the measuring cell.

9. The measurement method of the measuring device for measuring the pH value of a water sample according to claim 8, characterized in that, Also includes: Open the inlet / outlet valve and the water inlet / outlet valve to introduce inert gas and pressurize the water sample into the measuring cell.

10. The measurement method of the measuring device for measuring the pH value of a water sample according to claim 9, characterized in that, Also includes: Observe the pH meter display value; once the value stabilizes, the current pH value will be automatically recorded and displayed. After the measurement is completed, close the inlet / outlet valve and the water inlet / outlet valve, drain the remaining water sample from the water sample bottle, and rinse the measuring cell and pipeline with distilled water to ensure the system is clean.

Images