Wide-range high-precision conductivity measuring device

Abstract

The utility model relates to the technical field of conductivity measurement, and discloses a wide-range high-precision conductivity measuring device which comprises a sample injection electromagnetic valve (1), a high-range conductivity meter (2), a drainage electromagnetic valve (3), an isolation electromagnetic valve (4), a low-range conductivity meter (5), a drainage main valve (6) and a measuring pipeline, the measuring pipeline comprises a first measuring pipeline (71) and a second measuring pipeline (72); one side of the sampling electromagnetic valve (1) is connected with a water outlet of a regeneration tower drainage pipe, the other end of the sampling electromagnetic valve (1) is respectively communicated with the drainage electromagnetic valve (3) and the isolation electromagnetic valve (4) through a first measuring pipeline (71), and the high-range conductivity meter (2) is arranged on the first measuring pipeline (71); the drainage electromagnetic valve (3) is directly connected with the drainage main valve (6); the isolation electromagnetic valve (4) is connected with the main drainage valve (6) through a second measuring pipeline (72); and the drainage electromagnetic valve (3) and the isolation electromagnetic valve (4) are connected in parallel on two branches.

Description

Technical Field

[0001] The utility model relates to the technical field of condensate polishing and water quality treatment optimization, and particularly relates to a wide-range and high-precision conductivity measuring device. Background Technique

[0002] With the continuous increase of the unit capacity and parameters of thermal power plants, higher requirements are put forward for the steam-water quality. The steam-water quality during the operation of the unit mainly depends on the operation of condensate polishing to optimize the water quality. After the resin in the condensate polishing fails during operation, it is usually regenerated outside the body. The regeneration steps are mainly divided into transferring the failed resin to the regeneration analysis system, separating the anion and cation resins of the failed resin, transferring the separated resins to the anion and cation regeneration towers for regeneration respectively, and mixing the resins for standby after qualified regeneration.

[0003] Among them, the anion and cation resin regeneration stages of the condensate polishing equipment are specifically divided into 3 specific steps: feeding acid and alkali - displacement - rinsing. Taking the anion resin as an example, first, a 2%-5% NaOH solution is used to carry out an ion exchange reaction on the anions on the failed resin. After the alkali regeneration is completed, in order to prevent the NaOH solution from contaminating the cation resin in the next resin mixing operation, the regeneration liquid in the resin needs to be rinsed clean with demineralized water. The current steps are: low-flow displacement for 30 - 40 minutes, and then a scrubbing - rinsing cycle is carried out, that is, a certain amount of water is retained and compressed air is introduced to scrub the resin, and after scrubbing, a large-flow rinse is carried out for 10 - 15 minutes, and the cycle is repeated until the drainage conductivity ≤ 5 μS / cm, and then the rinsing ends. The same is true for the cation resin. First, low-flow displacement is carried out, and then a scrubbing - rinsing cycle is carried out to rinse the hydrochloric acid regeneration solution as much as possible. This step consumes a large amount of demineralized water, and the scrubbing causes great wear on the resin.

[0004] In addition, in order to optimize the rinsing effect, it is necessary to judge the rinsing effect of the whole process of resin displacement, scrubbing - rinsing, so as to determine the best rinsing sequence. Conductivity can conveniently measure the rinsing effect. By analyzing the change of the drainage conductivity of the regeneration tower during the rinsing process and the consumption of demineralized water, the rinsing process that can achieve the optimal effect is determined, so as to achieve water-saving and efficient rinsing. However, to achieve this purpose, it is necessary to measure the conductivity of the whole process of displacement and rinsing after resin regeneration. According to the characteristics of the drainage after resin regeneration, during the displacement stage, the drainage conductivity of the regeneration tower is between 2,0000 - 60,000 μS / cm, and the measuring range of the conductivity meter needs to reach 100 mS / cm. After the rinsing is completed, the drainage conductivity ≤ 5 μS / cm is qualified for rinsing, and the measuring accuracy of the conductivity meter needs to reach 0.5 μS / cm. Therefore, the whole-process conductivity measurement requires a sufficiently large measuring range of the conductivity meter, and at the same time, accurate measurement at a low range should also be achievable.

[0005] Current conductivity measuring devices cannot meet the above measurement requirements, and there is a technical need to develop new conductivity measuring devices with multiple ranges and wide range characteristics. Utility Model Content

[0006] The purpose of this invention is to provide a wide-range, high-precision conductivity measuring device. By selecting a high-range online conductivity meter with a range of 100mS / cm to 200mS / cm and a low-range conductivity meter with a range of 100μS / cm to 200μS / cm, the device records the conductivity of the regeneration tower throughout the entire process and calculates the amount of regenerated water. This allows for adjustments to the rinsing steps during the resin regeneration stage based on the conductivity change trend, thereby achieving water-saving and efficient rinsing throughout the overall regeneration process.

[0007] This utility model provides a wide-range, high-precision conductivity measuring device, comprising:

[0008] The sample injection solenoid valve (1), high-range conductivity meter (2), drain solenoid valve (3), isolation solenoid valve (4), low-range conductivity meter (5), drain main valve (6), and measuring pipeline; wherein: the measuring pipeline includes a first measuring pipeline (71) and a second measuring pipeline (72);

[0009] One side of the injection solenoid valve (1) is connected to the outlet of the regeneration tower drain pipe, and the other end of the injection solenoid valve (1) is connected to the drain solenoid valve (3) and the isolation solenoid valve (4) respectively through the first measuring pipeline (71). The high-range conductivity meter (2) is installed on the first measuring pipeline (71).

[0010] The drain solenoid valve (3) is directly connected to the main drain valve (6);

[0011] The isolation solenoid valve (4) is connected to the main drain valve (6) through the second measuring pipeline (72);

[0012] The drain solenoid valve (3) and the isolation solenoid valve (4) are connected in parallel on two branches.

[0013] Preferably, the high-range conductivity meter (2) and the low-range conductivity meter (5) include a conductivity data storage module; the conductivity data storage module is used to store the different conductivity values ​​measured by the high-range conductivity meter (2) and the low-range conductivity meter (5) respectively, so as to adjust the rinsing steps of the resin regeneration stage according to the trend of conductivity change, and realize water-saving and efficient rinsing in the overall regeneration process.

[0014] Preferably, the high-range conductivity meter (2) and the low-range conductivity meter (5) include a remote signal transmission module; the remote signal transmission module is used to remotely transmit the different conductivity values ​​measured by the high-range conductivity meter (2) and the low-range conductivity meter (5) to the central control station as a reference parameter for remotely controlling the working process of the resin regeneration tower and optimizing the process parameters.

[0015] Preferably, a conductivity change recorder is installed on the drainage pipe of the regeneration tower to record the changes in conductivity of the discharged water in the drainage pipe of the regeneration tower throughout the entire process, and to calculate the amount of regenerated water based on the changes in conductivity of the discharged water in the drainage pipe of the regeneration tower.

[0016] Preferably, the conductivity measuring device based on dual range further includes a regenerated water volume measuring sensor; the regenerated water volume measuring sensor is installed on the measuring pipeline where the main drain valve (6) is located, so as to measure the total amount of hydrochloric acid regeneration solution and demineralized water as the regenerated water volume; or the regenerated water volume measuring sensor is installed only on the demineralized water input pipeline, so as to measure the amount of demineralized water delivered to the hydrochloric acid regeneration solution as the regenerated water volume.

[0017] Preferably, the high-range conductivity meter (2) is a high-range online conductivity meter with a range of 100 ms / cm to 200 mS / cm.

[0018] Preferably, the low-range conductivity meter (5) is a low-range online conductivity meter with a range of 100μS / cm-200μS / cm.

[0019] Preferably, the dual-range conductivity measuring device further includes a sampling tube, which is located at the outlet of the drain pipe of the regeneration tower. The sampling tube is connected to the high-range conductivity meter (2) through the first measuring pipe (71) and the sampling solenoid valve (1). The high-range conductivity meter (2) is connected to the drain solenoid valve (3) and the main drain valve (6) on one side. At the same time, the second measuring pipe (72) is introduced outside the main drain valve (6) and connected to the low-range conductivity meter (5) and the isolation solenoid valve (4) through the second measuring pipe (72).

[0020] Preferably, the diameter of the sampling tube is between 8mm and 15mm.

[0021] Preferably, the injection solenoid valve (1), drainage solenoid valve (3), isolation solenoid valve (4) and drainage main valve (6) are all ball valves with acid and alkali resistance.

[0022] The conductivity measurement method and working principle of the dual-range conductivity measuring device of the present invention are as follows:

[0023] S1, based on the determination that the condensate polishing equipment has entered the anion and cation resin regeneration stage, the injection solenoid valve (1) is closed; wherein the program control sequence of the anion and cation resin regeneration stage is acid-base injection-displacement-rinsing.

[0024] S2, based on the determined program control step sequence to enter the replacement, that is, to exchange the anions on the failed resin through alkaline solution, open the drain solenoid valve (3) and the drain main valve (6), open the sample injection solenoid valve (1), put the high-range conductivity meter (2) into operation, and record the online conductivity data of the replacement stage through the high-range conductivity meter (2);

[0025] S3, real-time monitoring of the changes in online conductivity data during the replacement phase and the relationship between the online conductivity data during the replacement phase and the range of the low-range conductivity meter (5). When the online conductivity data during the replacement phase is less than the range of the low-range conductivity meter (5), the isolation solenoid valve (4) is opened and the drainage solenoid valve (3) is closed. The low-range conductivity meter (5) is put into operation to continue to accurately measure and record the changes in drainage conductivity. The flushing steps are adjusted based on the changes in drainage conductivity to achieve water-saving and efficient flushing.

[0026] S4, when the drainage conductivity of the water sample is ≤5μS / cm, close the main drainage valve (6) and the sample injection solenoid valve (1), and after confirming that a certain amount of water sample is retained in the instrument corresponding to the conductivity measuring device, the instrument is taken out of operation and will be put into operation after the next cation and anion resin regeneration stage.

[0027] The beneficial effects of the device of this utility model are:

[0028] By selecting high-range online conductivity meters with a range of 100mS / cm to 200mS / cm and low-range conductivity meters with a range of 100μS / cm to 200μS / cm respectively, and by recording the conductivity of the regeneration tower throughout the entire process and statistically analyzing the regeneration water volume, the rinsing steps of the resin regeneration stage can be adjusted according to the trend of conductivity changes, thereby achieving water-saving and efficient rinsing in the overall regeneration process. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1This is a schematic diagram illustrating the structural principle of a dual-range conductivity measuring device according to an embodiment of the present invention.

[0031] Figure 2 This is a flowchart illustrating the principle of the measurement method of the conductivity measuring device based on a dual-range measurement device provided in this embodiment of the present invention. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Example 1

[0036] See Figure 1 This embodiment provides a conductivity measurement device based on dual ranges, comprising:

[0037] The instrument includes an injection solenoid valve 1, a high-range conductivity meter 2, a drain solenoid valve 3, an isolation solenoid valve 4, a low-range conductivity meter 5, a main drain valve 6, and a measuring pipeline; wherein the measuring pipeline includes a first measuring pipeline 71 and a second measuring pipeline 72.

[0038] One side of the injection solenoid valve 1 is connected to the outlet of the regeneration tower drain pipe, and the other end of the injection solenoid valve 1 is connected to the drain solenoid valve 3 and the isolation solenoid valve 4 respectively through the first measuring pipe 71. A high-range conductivity meter 2 is installed on the first measuring pipe 71.

[0039] The drain solenoid valve 3 is directly connected to the main drain valve 6;

[0040] The isolation solenoid valve 4 is connected to the main drain valve 6 via the second measuring pipe 72;

[0041] The drain solenoid valve 3 and the isolation solenoid valve 4 are connected in parallel on two branches;

[0042] Both the high-range conductivity meter 2 and the low-range conductivity meter 5 have conductivity data storage modules and remote signal transmission modules.

[0043] In this embodiment, the conductivity data storage module stores the different conductivity values ​​measured by the high-range conductivity table 2 and the low-range conductivity table 5 respectively. This allows for the adjustment of the rinsing steps during the resin regeneration stage based on the conductivity variation trend, thereby achieving water-saving and efficient rinsing throughout the regeneration process. The conductivity of the regeneration tower is recorded throughout the entire process, and the rinsing steps are adjusted according to the conductivity variation trend to achieve water-saving and efficient rinsing.

[0044] In this embodiment, the different conductivity values ​​measured by the high-range conductivity meter 2 and the low-range conductivity meter 5 are remotely transmitted to the central control station through the remote signal transmission module, serving as the reference parameters for remotely controlling the operation of the resin regeneration tower and optimizing process parameters.

[0045] In this embodiment, the volume of the measuring pipeline is designed based on the volume of the measuring electrodes and to meet the instrument's measurement requirements.

[0046] In this embodiment, the change in conductivity of the discharged water in the regeneration tower drain pipe is recorded throughout the entire process, and the amount of regenerated water is calculated based on the change in conductivity of the discharged water in the regeneration tower drain pipe.

[0047] In this embodiment, the conductivity measurement device based on dual ranges also includes a regenerated water volume measurement sensor; the regenerated water volume measurement sensor is installed on the measuring pipeline where the main drain valve 6 is located, so as to measure the total amount of hydrochloric acid regeneration solution and demineralized water as the regenerated water volume; or the regenerated water volume measurement sensor is installed only on the demineralized water input pipeline, so as to measure the amount of demineralized water delivered to the hydrochloric acid regeneration solution as the regenerated water volume.

[0048] As a preferred embodiment, the high-range conductivity table 2 is a high-range online conductivity table with a range of 100 mS / cm to 200 mS / cm; the low-range conductivity table 5 is a low-range online conductivity table with a range of 100 μS / cm to 200 μS / cm.

[0049] As a preferred embodiment, the dual-range conductivity measuring device further includes a sampling tube, which is located at the outlet of the regeneration tower drain pipe. The sampling tube is connected to the high-range conductivity meter 2 through the first measuring pipe 71 and the sampling solenoid valve 1. The high-range conductivity meter 2 is connected to the drain solenoid valve 3 and the main drain valve 6 on one side. At the same time, a second measuring pipe 72 is introduced outside the main drain valve 6, and the low-range conductivity meter 5 and the isolation solenoid valve 4 are connected through the second measuring pipe 72.

[0050] In a preferred embodiment, the diameter of the sampling tube is determined according to the volume of the measuring pipeline, and the diameter of the sampling tube is between 8mm and 15mm.

[0051] In existing technologies, regeneration towers are usually equipped with sampling tubes, but the conductivity measuring instruments configured in the sampling tubes are usually low-range conductivity meters with certain range limits. Currently, the operation involves closing the conductivity inlet gate in advance and then putting the conductivity meter into operation at the end, but this still easily causes damage to the low-range conductivity meter in a short period of time.

[0052] In a preferred embodiment, the injection solenoid valve 1, the drain solenoid valve 3, the isolation solenoid valve 4, and the drain main valve 6 are all ball valves with acid and alkali resistance.

[0053] Example 2

[0054] See Figure 2 This embodiment provides a conductivity measurement method based on a dual-range conductivity measurement device according to the first aspect, comprising:

[0055] S1, based on the determination that the condensate polishing equipment has entered the anion and cation resin regeneration stage, close the injection solenoid valve 1; wherein the program control sequence of the anion and cation resin regeneration stage is acid / alkali injection - displacement - rinsing.

[0056] In this embodiment, after the injection solenoid valve 1 is opened in step S1, the injection solenoid valve 1 remains open until the rinsing is completed in step S4 and then the injection solenoid valve 1 is closed.

[0057] S2, based on the determined program control steps, enter the replacement, that is, the anions on the exhausted resin are exchanged by alkaline solution, the drain solenoid valve 3 and the drain main valve 6 are opened, the sample injection solenoid valve 1 is opened, the high-range conductivity meter 2 is put into operation, and the online conductivity data of the replacement stage is recorded by the high-range conductivity meter 2.

[0058] S3 monitors the changes in online conductivity data during the replacement phase and the relationship between the online conductivity data during the replacement phase and the range of the low-range conductivity meter 5. When the online conductivity data during the replacement phase is less than the range of the low-range conductivity meter 5, the isolation solenoid valve 4 is opened while the drain solenoid valve 3 is closed. The low-range conductivity meter 5 is put into operation to continue to accurately measure and record the changes in drain conductivity. The flushing steps are adjusted based on the changes in drain conductivity to achieve water-saving and efficient flushing.

[0059] S4. When the drainage conductivity of the water sample is ≤5μS / cm, close the main drainage valve 6 and the sample inlet solenoid valve 1. After confirming that a certain amount of water sample is retained in the instrument corresponding to the conductivity measuring device, the instrument will be taken out of operation and will be put back into operation after the next cation and anion resin regeneration stage.

[0060] In a preferred embodiment, adjusting the flushing steps based on the change in drainage conductivity to achieve water-saving and efficient flushing includes:

[0061] (1) Adjust the scrubbing and rinsing times based on the changes in the drainage conductivity and the accumulated experience of scrubbing and rinsing, and determine different working conditions based on the adjusted scrubbing and rinsing times;

[0062] As a preferred embodiment, determining different working conditions includes determining six working conditions based on scrubbing time and rinsing water volume.

[0063] As shown in Table 1, for operating condition 1, the scrubbing time is 5 minutes and the rinsing time is 10 minutes; for operating condition 2, the scrubbing time is 10 minutes and the rinsing time is 10 minutes; for operating condition 3, the scrubbing time is 15 minutes and the rinsing time is 10 minutes; for operating condition 4, the scrubbing time is 5 minutes and the rinsing time is 15 minutes; for operating condition 5, the scrubbing time is 10 minutes and the rinsing time is 15 minutes; and for operating condition 6, the scrubbing time is 15 minutes and the rinsing time is 15 minutes.

[0064] Table 1

[0065] Scrubbing-rinsing conditions Scrubbing time (min) Rinse time (min) Operating Condition 1 5 10 Operating Condition 2 10 10 Operating Condition 3 15 10 Operating Condition 4 5 15 Operating Condition 5 10 15 Operating Condition 6 15 15

[0066] (2) Statistical analysis of water-saving effects during the replacement phase and the scrubbing-rinsing phase under the different working conditions;

[0067] The standard statistical and evaluation table for water-saving effects is shown in Table 2.

[0068] As shown in Table 2, the water-saving effect statistics and evaluation include replacement time, scrubbing-rinsing time, initial conductivity, final conductivity, demineralized water volume, stage conductivity change, and conductivity change per unit volume of water; wherein:

[0069] Phase conductivity change = (initial conductivity - final conductivity) / 5;

[0070] Change in conductivity per unit volume of water = (Initial conductivity - Ending conductivity) / Demineralized water volume in this stage;

[0071] Table 2

[0072]

[0073]

[0074] (3) Evaluate the water-saving effect of the replacement phase and the scrubbing-rinsing phase under different working conditions, and optimize the rinsing process; wherein the water-saving effect evaluation is based on current regeneration experience; the rinsing optimization includes optimizing the replacement-scrubbing sequence; including:

[0075] Water-saving optimization of replacement time: The optimization index is the change in conductivity during the stage; with a 5-minute replacement as the statistical stage, if the change in conductivity during the replacement stage is less than the average change in conductivity of the previous stage * 0.65, then the replacement stage ends;

[0076] Water-saving optimization for the scrubbing-rinsing stage: Using the change in conductivity per unit volume of the six operating conditions as the evaluation index, the operating condition with the largest change in conductivity per unit volume of water is selected as the optimal operating condition for the scrubbing-rinsing stage.

[0077] Through the above description of the embodiments, those skilled in the art can clearly understand that the above embodiments can be implemented by software, or by using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions of the above embodiments can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, mobile hard drive, etc.), including several instructions to cause a computer device (such as a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of this utility model.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A wide-range, high-precision conductivity measuring device, characterized in that, include: The sample injection solenoid valve (1), high-range conductivity meter (2), drain solenoid valve (3), isolation solenoid valve (4), low-range conductivity meter (5), drain main valve (6), and measuring pipeline; wherein: the measuring pipeline includes a first measuring pipeline (71) and a second measuring pipeline (72); One side of the injection solenoid valve (1) is connected to the outlet of the regeneration tower drain pipe, and the other end of the injection solenoid valve (1) is connected to the drain solenoid valve (3) and the isolation solenoid valve (4) respectively through the first measuring pipeline (71). The high-range conductivity meter (2) is installed on the first measuring pipeline (71). The drain solenoid valve (3) is directly connected to the main drain valve (6); The isolation solenoid valve (4) is connected to the main drain valve (6) through the second measuring pipeline (72); The drain solenoid valve (3) and the isolation solenoid valve (4) are connected in parallel on two branches.

2. The wide-range, high-precision conductivity measuring device according to claim 1, characterized in that, The high-range conductivity meter (2) and the low-range conductivity meter (5) include a conductivity data storage module. The conductivity data storage module is used to store the different conductivity values ​​measured by the high-range conductivity meter (2) and the low-range conductivity meter (5) respectively, so as to adjust the rinsing steps in the resin regeneration stage according to the trend of conductivity change, and realize water-saving and efficient rinsing in the overall regeneration process.

3. The wide-range, high-precision conductivity measuring device according to claim 1, characterized in that, The high-range conductivity meter (2) and the low-range conductivity meter (5) include a remote signal transmission module; the remote signal transmission module is used to remotely transmit the different conductivity values ​​measured by the high-range conductivity meter (2) and the low-range conductivity meter (5) to the central control station as a reference parameter for remotely controlling the working process of the resin regeneration tower and optimizing the process parameters.

4. A wide-range, high-precision conductivity measuring device according to claim 2 or 3, characterized in that, A conductivity change recorder is installed on the drainage pipe of the regeneration tower to record the changes in conductivity of the discharged water in the drainage pipe throughout the entire process, and to calculate the amount of regenerated water based on the changes in conductivity of the discharged water in the drainage pipe.

5. The wide-range, high-precision conductivity measuring device according to claim 4, characterized in that, The conductivity measurement device based on dual range also includes a regenerated water volume measurement sensor; the regenerated water volume measurement sensor is installed on the measuring pipeline where the main drain valve (6) is located, so as to measure the total amount of hydrochloric acid regeneration solution and demineralized water as the regenerated water volume; or the regenerated water volume measurement sensor is installed only on the demineralized water input pipeline, so as to measure the amount of demineralized water delivered to the hydrochloric acid regeneration solution as the regenerated water volume.

6. The wide-range, high-precision conductivity measuring device according to claim 1, characterized in that, The high-range conductivity table (2) is a high-range online conductivity table with a range of 100 mS / cm to 200 mS / cm.

7. The wide-range, high-precision conductivity measuring device according to claim 1, characterized in that, The low-range conductivity table (5) is a low-range online conductivity table with a range of 100μS / cm-200μS / cm.

8. A wide-range, high-precision conductivity measuring device according to claim 6 or 7, characterized in that, The dual-range conductivity measuring device also includes a sampling tube, which is located at the outlet of the drain pipe of the regeneration tower. The sampling tube is connected to the high-range conductivity meter (2) through the first measuring pipe (71) and the sampling solenoid valve (1). The high-range conductivity meter (2) is connected to the drain solenoid valve (3) and the main drain valve (6) on one side. At the same time, the second measuring pipe (72) is introduced outside the main drain valve (6) and connected to the low-range conductivity meter (5) and the isolation solenoid valve (4) through the second measuring pipe (72).

9. A wide-range, high-precision conductivity measuring device according to claim 8, characterized in that, The diameter of the sampling tube is between 8mm and 15mm.

10. A wide-range, high-precision conductivity measuring device according to claim 1, characterized in that, The sample injection solenoid valve (1), drain solenoid valve (3), isolation solenoid valve (4) and drain main valve (6) are all ball valves with acid and alkali resistance.

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