Continuous online pH value measuring system

Abstract

The utility model discloses a continuous online pH value measuring system and relates to the technical field of pH measurement. The pH colored tape is arranged to replace an existing pH meter electrode, so that the requirement for continuous online measurement of the pH value under the working conditions of severe media such as strong acid, strong alkali and high salt can be met, and the maintenance and replacement cost of the pH meter electrode can be saved on the basis of ensuring the detection precision; the service life of the continuous online pH value measuring system is prolonged, and the sensitivity and the reliability of pH value detection are kept; the first colored tape winding and unwinding device and the second colored tape winding and unwinding device can be matched to achieve conveying of the pH colored tape so as to guarantee continuous proceeding of pH value measuring operation. According to the continuous online pH value measuring system, the colored tape image acquisition system is arranged, so that image color acquisition can be carried out on the reacted pH colored tape in time, and the detection efficiency of the whole continuous online pH value measuring system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pH measurement, in particular to a pH value continuous online measurement system. Background Art

[0002] pH measurement technology has been widely used in the pharmaceutical, petroleum, chemical, electric power, new energy and other industries. In order to improve the measurement efficiency, the existing technology proposes a pH meter that can measure online automatically. The existing pH meters all use pH meter electrodes for pH measurement, and the main problems are as follows: ① For harsh media conditions such as strong acids and strong alkalis, the pH meter electrodes are easily corroded and damaged, which not only affects the detection accuracy, but also requires frequent replacement of new pH meter electrodes, which is costly; ② For high-salt media conditions, after a period of use, the pH meter electrodes are easily precipitated and wrapped by substances in the high-salt medium, affecting the detection accuracy and sensitivity of the pH meter electrodes, which not only reduces the service life of the pH meter electrodes, but also requires regular manual cleaning and maintenance, increasing labor costs and maintenance and replacement costs of the pH meter electrodes.

[0003] In order to solve the above problems existing in the existing pH meters, the utility model proposes a novel pH value continuous online measurement system. Utility Model Content

[0004] The purpose of the utility model is to provide a novel continuous online pH value measurement system, which can meet the needs of continuous online pH value measurement under harsh media conditions such as strong acid, strong alkali, high salt, etc. at low cost and high precision, and solve the problems of low detection accuracy, short service life, high replacement and maintenance costs of pH meter electrodes under harsh media conditions such as strong acid, strong alkali, high salt, etc. existing in the above-mentioned existing pH meters.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a pH value continuous online measurement system, comprising:

[0007] The pH ribbon system comprises a ribbon retracting device 1 and a ribbon retracting device 2, wherein one of the ribbon retracting device 1 and the ribbon retracting device 2 is used to release the pH ribbon, and the other is used to recycle the pH ribbon to realize the transmission of the pH ribbon; a ribbon receiving area and a ribbon sampling area are sequentially arranged between the ribbon retracting device 1 and the ribbon retracting device 2 along the transmission direction of the pH ribbon;

[0008] A sample injection system for providing a reagent for measuring pH;

[0009] A sample discharge system connected to the sample introduction system, wherein the sample discharge system can discharge the reagent onto the pH ribbon in the ribbon receiving area;

[0010] A color ribbon image acquisition system is arranged in the color ribbon sampling area, and the color ribbon image acquisition system is used to acquire the image color of the pH color ribbon after the reaction;

[0011] The control system is communicatively connected with the pH ribbon system, the sample introduction system, the sample discharge system, and the ribbon image acquisition system to achieve continuous online measurement of the pH value of the reagent.

[0012] Preferably, the ribbon taking-up device 1 includes a pH ribbon disk, on which the pH ribbon is wound; the ribbon taking-up device 2 includes a pH ribbon collecting disk and a rotating drive device 1 connected to the pH ribbon collecting disk, the rotating drive device 1 is used to drive the pH ribbon collecting disk to rotate so as to wind up the pH ribbon released from the pH ribbon disk; the rotating drive device 1 is communicatively connected to the control system.

[0013] Preferably, the pH ribbon system also includes a speed sensor communicatively connected to the control system, wherein the speed sensor is disposed on at least one of the pH ribbon collection disk, the pH ribbon disk and the rotating drive device, or the speed sensor is disposed on one side of the pH ribbon, and the speed sensor is capable of detecting the transmission rate of the pH ribbon.

[0014] Preferably, the sample arrangement system comprises:

[0015] A collecting pipeline, on which a reagent flow meter and / or a reagent thermometer are arranged, and the injection end of the collecting pipeline is connected to the injection system;

[0016] A dropper connected to the sample outlet end of the collecting pipe, and the dropper can titrate the reagent onto the pH ribbon;

[0017] A second rotation drive device is connected to the drip nozzle, and the second rotation drive device can drive the drip nozzle to rotate so that the drip nozzle switches between a first state and a second state, wherein in the first state, the drip nozzle is located above the pH ribbon in the ribbon sample connection area to titrate the reagent onto the pH ribbon, and in the second state, the drip nozzle deviates from the pH ribbon in the ribbon sample connection area to avoid the discharge of substances in the drip nozzle onto the pH ribbon; the second rotation drive device is communicatively connected to the control system.

[0018] Preferably, the pH value continuous online measurement system further includes a cleaning system, and the cleaning system includes:

[0019] A cleaning liquid barrel, in which a liquid level sensor 1 is arranged;

[0020] A cleaning liquid pipeline, one end of which is connected to the cleaning liquid barrel, and the other end of which is connected to the injection end of the collecting pipeline;

[0021] a cleaning liquid pump, disposed on the cleaning liquid pipeline, and used for pumping the cleaning liquid in the cleaning liquid barrel into the drip nozzle in the second state;

[0022] A waste liquid collecting device, disposed below the pH ribbon in the ribbon sample receiving area, capable of collecting liquid leaking from the pH ribbon and liquid discharged from the drip nozzle in the second state;

[0023] The cleaning liquid pump and the liquid level sensor are both communicatively connected to the control system.

[0024] Preferably, the injection system comprises:

[0025] A sample pipeline, one end of which is used to be connected to an external sample reagent supply device, and the other end is connected to the injection end of the collecting pipeline;

[0026] A sample pump, disposed on the sample pipeline, and used to pump the sample reagent into the drip nozzle;

[0027] A first standard liquid barrel and a second standard liquid barrel, wherein at least one of the first standard liquid barrel and the second standard liquid barrel is provided with a second liquid level sensor;

[0028] A standard liquid pipeline 1, one end of which is connected to the standard liquid barrel 1, and the other end of which is connected to the sampling end of the collecting pipeline;

[0029] A standard liquid pump 1 is arranged on the standard liquid pipeline 1, and is used to pump the standard liquid reagent 1 in the standard liquid barrel 1 into the drip nozzle;

[0030] A second standard liquid pipeline, one end of which is connected to the second standard liquid barrel, and the other end of which is connected to the sampling end of the collecting pipeline;

[0031] A second standard liquid pump is arranged on the second standard liquid pipeline, and is used to pump the second standard liquid reagent in the second standard liquid barrel into the drip nozzle;

[0032] The sample pump, the first standard solution pump and the second standard solution pump are all communicatively connected to the control system.

[0033] Preferably, the ribbon image acquisition system comprises:

[0034] A light shield is arranged in the color ribbon sampling area, and the pH color ribbon in the color ribbon sampling area moves through the light shield;

[0035] An image acquisition device is arranged in the light shield and is used for acquiring the image color of the pH color strip entering the light shield; the image acquisition device is communicatively connected with the control system.

[0036] Preferably, a lighting device is also provided in the light shield.

[0037] Preferably, the pH value continuous online measurement system further includes a protection and purge system, and the protection and purge system includes:

[0038] An air flow pipeline, one end of which is used for connecting to an external air flow supply device, and the other end of which is provided with an air flow nozzle, the air flow nozzle is located above the pH ribbon in the ribbon sample receiving area, and is used for purging the reagent on the pH ribbon; the air flow pipeline is provided with an air flow pump, a gas purification device, a gas flow meter and a pressure regulating solenoid valve;

[0039] An instrument protective housing having a closed space, wherein the pH ribbon system and the ribbon image acquisition system are both arranged in the closed space;

[0040] The air flow pump, the gas flow meter and the pressure regulating solenoid valve are all communicatively connected with the control system.

[0041] Preferably, the protection and purge system also includes an environment detection device, which is arranged in the closed space and can monitor the temperature, pressure and / or humidity in the closed space; the environment detection device is communicatively connected to the control system.

[0042] The utility model proposes a pH value continuous online measurement method implemented based on any one of the pH value continuous online measurement systems described above, which is a fully automatic continuous detection method, comprising:

[0043] The sample reagent is continuously provided to the sample discharge system through the sample injection system, and the sample discharge system discharges the sample reagent to an area outside the pH color band;

[0044] The sample reagent is provided to the sample discharge system through the sample injection system, and the sample discharge system discharges the sample reagent onto the pH ribbon in the ribbon sample receiving area;

[0045] The pH color ribbon after the reaction is transferred from the color ribbon receiving area to the color ribbon sampling area, and the color ribbon image acquisition system performs image color acquisition on the pH color ribbon;

[0046] The control system receives the image color acquisition information from the color ribbon image acquisition system and calculates the pH value of the sample reagent.

[0047] The utility model proposes a pH value continuous online measurement method implemented based on any one of the pH value continuous online measurement systems described above, which is a fully automatic two-point calibration detection method, comprising:

[0048] The sample discharge system continuously provides the standard liquid reagent 1 through the sample injection system, and the standard liquid reagent 1 is discharged to the area outside the pH color band by the sample discharge system;

[0049] The sample discharging system provides the standard liquid reagent 1 through the sample feeding system, and the standard liquid reagent 1 is discharged by the sample discharging system onto the pH ribbon in the ribbon receiving area;

[0050] The pH color ribbon after the reaction is transferred from the color ribbon receiving area to the color ribbon sampling area, and the color ribbon image acquisition system performs image color acquisition on the pH color ribbon;

[0051] The control system receives the image color acquisition information of the color ribbon image acquisition system and calculates the pH value of the standard solution reagent 1;

[0052] The sample discharge system is continuously provided with the second standard liquid reagent through the sample injection system, and the second standard liquid reagent is discharged to the area outside the pH color band by the sample discharge system;

[0053] The sample discharging system provides the second standard liquid reagent through the sample feeding system, and the second standard liquid reagent is discharged by the sample discharging system onto the pH ribbon in the ribbon receiving area;

[0054] The pH color ribbon after the reaction is transferred from the color ribbon receiving area to the color ribbon sampling area, and the color ribbon image acquisition system performs image color acquisition on the pH color ribbon;

[0055] The control system receives the image color acquisition information of the color ribbon image acquisition system, and calculates the pH value of the standard solution reagent 2;

[0056] The control system saves the pH values ​​of the standard solution reagent 1 and the standard solution reagent 2 as calibration results to provide a reference basis for measurement before the next calibration.

[0057] Compared with the prior art, the utility model has achieved the following technical effects:

[0058] The utility model proposes a pH value continuous online measurement system with reasonable structural design. By setting a pH ribbon to replace the existing pH meter electrode, it can not only meet the pH value continuous online measurement needs under strong acid, strong alkali, high salt and other harsh media conditions, but also save the maintenance and replacement costs of the pH meter electrode on the basis of ensuring the detection accuracy, which is beneficial to improving the service life of the pH value continuous online measurement system and maintaining the sensitivity and reliability of pH value detection. At the same time, the ribbon retracting device 1 and the ribbon retracting device 2 are set up to cooperate to realize the transmission of the pH ribbon, so that the ribbon receiving area can continuously replace the new pH ribbon area, ensure the detection accuracy of the pH value, and ensure the continuous pH value measurement operation of the pH value continuous online measurement system; based on the aforementioned ribbon method for measuring pH value, the utility model also sets a ribbon image acquisition system in the ribbon sampling area, which can timely collect the image color of the pH ribbon after the reaction, thereby improving the detection efficiency of the entire pH value continuous online measurement system.

[0059] The pH continuous online measurement method implemented based on the above-mentioned pH continuous online measurement system is a fully automatic continuous detection method or a fully automatic two-point calibration detection method. Since the measurement method is implemented based on the above-mentioned pH continuous online measurement system, the detection process can not only meet the pH continuous online measurement needs under harsh media conditions such as strong acid, strong alkali, and high salt, but also improve the detection efficiency of the entire pH continuous online measurement on the basis of ensuring the detection accuracy, and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0061] Figure 1 This is a schematic diagram of a continuous online pH value measurement system disclosed in an embodiment of the utility model.

[0062] In the figure: 100, pH value continuous online measurement system; 1, pH ribbon disk; 2, pH ribbon collection disk; 3, support guide shaft; 4, pH ribbon; 5, speed sensor; 6, control system; 7, collection pipeline; 8, reagent flow meter; 9, reagent thermometer; 10, drip nozzle; 11, rotary drive device II; 12, cleaning liquid barrel; 13, liquid level sensor I; 14, cleaning liquid pipeline; 15, cleaning liquid pump; 16, waste liquid collection device; 17, sample pipeline; 18, multi-way valve II; 1 9. Standard liquid barrel 1; 20. Standard liquid barrel 2; 21. Liquid level sensor 2; 22. Standard liquid pipeline 1; 23. Standard liquid pump 1; 24. Standard liquid pipeline 2; 25. Standard liquid pump 2; 26. Light shield; 27. Image acquisition device; 28. Illumination device; 29. ​​Air flow pipeline; 30. Air flow nozzle; 31. Air flow pump; 32. Gas purification device; 33. Gas flow meter; 34. Pressure regulating solenoid valve; 35. Temperature sensor; 36. Humidity sensor; 37. Pressure sensor; 38. Multi-way valve 1. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0064] One of the purposes of the utility model is to provide a novel continuous online pH value measurement system, which can meet the needs of continuous online pH value measurement under harsh media conditions such as strong acid, strong alkali, high salt, etc. at low cost and high precision, and solve the problems of low detection accuracy, short service life, high replacement and maintenance costs of pH meter electrodes in harsh media conditions such as strong acid, strong alkali, high salt, etc. existing in existing pH meters.

[0065] Another object of the present invention is to provide a method for continuous online measurement of pH value based on the above-mentioned continuous online measurement system of pH value.

[0066] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0067] Embodiment 1

[0068] like Figure 1As shown, this embodiment provides a pH value continuous online measurement system 100, including a pH ribbon system, a sample introduction system, a sample discharge system, a ribbon image acquisition system and a control system 6, wherein the pH ribbon system includes a ribbon retracting device 1 and a ribbon retracting device 2, the ribbon retracting device 1 is used to release the pH ribbon 4, the ribbon retracting device 2 is used to recover the pH ribbon 4, and the ribbon retracting device 1 and the ribbon retracting device 2 cooperate to realize the transmission of the pH ribbon 4; between the ribbon retracting device 1 and the ribbon retracting device 2, on the transmission path of the pH ribbon 4, a ribbon receiving area and a ribbon sampling area are sequentially arranged along the transmission direction of the pH ribbon 4, and the pH ribbon 4 will pass through the aforementioned ribbon receiving area and the ribbon sampling area in sequence from being released by the ribbon retracting device 1 to being reeled up by the ribbon retracting device 2. The above-mentioned injection system is used to provide reagents for the pH to be measured, such as sample reagents, standard solution reagents, etc.; the sample discharge system is connected to the above-mentioned injection system, and the sample discharge system can discharge the reagents provided by the injection system to the pH ribbon 4 in the ribbon receiving area, so that the pH ribbon 4 contacts the reagents, reacts, and produces corresponding color changes. The above-mentioned ribbon image acquisition system is arranged in the ribbon sampling area, and the ribbon image acquisition system is used to collect the image color of the pH ribbon 4 after the reaction; the control system 6 is connected to the above-mentioned pH ribbon system, injection system, sample discharge system, and ribbon image acquisition system to realize the continuous online measurement of the pH value of the reagent. The above-mentioned pH value continuous online measurement system 100 has a reasonable structural design, and the production and use costs of the pH ribbon are low. By setting the pH ribbon to replace the existing pH meter electrode, it can not only meet the continuous online measurement requirements of the pH value under the harsh media conditions such as strong acid, strong alkali, and high salt, but also save the maintenance and replacement costs of the pH meter electrode on the basis of ensuring the detection accuracy, which is conducive to improving the service life of the pH value continuous online measurement system 100 and maintaining the sensitivity and reliability of pH value detection. At the same time, the ribbon retracting device 1 and the ribbon retracting device 2 can cooperate to realize the transmission of the pH ribbon 4, so that the ribbon sampling area can continuously replace the new pH ribbon area, ensuring the continuous pH value measurement operation of the pH value continuous online measurement system 100; based on the aforementioned ribbon method for measuring pH value, this embodiment also sets a ribbon image acquisition system in the ribbon sampling area, which can timely perform image color acquisition of the pH ribbon 4 after the reaction, thereby improving the detection efficiency of the entire pH value continuous online measurement system 100.

[0069] In this embodiment, Figure 1As shown, the ribbon retracting device 1 specifically includes a pH ribbon reel 1, on which the pH ribbon 4 is wound. In order to ensure that when the pH ribbon retracting device 2 retracts the pH ribbon 4, the pH ribbon 4 can be smoothly released from the ribbon retracting device 1, it is preferred that the pH ribbon reel 1 is a reel that can rotate around its own axis, or the pH ribbon reel 1 is a fixed reel, and the pH ribbon 4 is rolled and movably mounted on the pH ribbon reel 1. The ribbon retracting device 2 includes a pH ribbon collecting reel 2 and a rotating drive device 1 connected to the pH ribbon collecting reel 2. The rotating drive device 1 is used to drive the pH ribbon collecting reel 2 to rotate so as to reel in the pH ribbon 4 released from the pH ribbon reel 1. When the pH ribbon collecting reel 2 reels in the pH ribbon 4, the pH ribbon 4 is pulled, thereby driving the pH ribbon 4 on the pH ribbon reel 1 to rotate and release. The rotating drive device 1 preferably uses a stepping motor, which is connected to the control system 6 for communication. The control system 6 can control the start and stop and the rotation speed of the stepping motor, thereby controlling the conveying state of the pH ribbon 4.

[0070] In this embodiment, in order to ensure the directional transmission of the pH ribbon 4 and keep the pH ribbon 4 basically straight during the transmission process, multiple support guide shafts 3 are also arranged at intervals on the transmission path of the pH ribbon 4. The support guide shafts 3 mainly play the role of supporting and guiding the pH ribbon 4. The support guide shafts 3 are generally fixed shaft structures, and the pH ribbon 4 reaches the pH ribbon collection disk 2 after winding around each support guide shaft 3 in sequence. In this solution, the support guide shafts 3, the pH ribbon disk 1 and the pH ribbon collection disk 2 are all installed on corresponding installation carriers, and the installation carrier can be specifically an integrated board or an instrument housing, etc.

[0071] In this embodiment, Figure 1 As shown, the pH ribbon system also includes a speed sensor 5 that is communicatively connected to the control system 6. The speed sensor 5 is disposed on at least one of the pH ribbon collection disk 2, the pH ribbon disk 1, and the rotary drive device 1. The speed sensor 5 can directly detect the rotation speed of the pH ribbon collection disk 2, the pH ribbon disk 1, or the rotary drive device 1, and the control system 6 can obtain the transmission rate of the pH ribbon 4 through the rotation speed. Alternatively, the speed sensor 5 can also be disposed on one side of the pH ribbon 4, and the speed sensor 5 is spaced apart from the pH ribbon 4, and the transmission rate of the pH ribbon 4 can be detected by photoelectric sensing or infrared sensing. The above-mentioned speed sensor 5 is a prior art, and its specific type and installation position can be flexibly adjusted according to actual needs. The main functions of the above-mentioned speed sensor 5 configured in the pH ribbon system of this embodiment are as follows:

[0072] (i) Measurement and positioning function of ribbon transmission distance: The speed sensor 5 can be set on one side of a certain supporting guide shaft 3, and the control system 6 can convert the speed data of the speed sensor 5 into the transmission distance of the pH ribbon 4, and then ensure that the transmission distance of the pH ribbon 4 is the same each time by controlling the rotating drive device 1.

[0073] (II) Function of alarming the remaining amount of the ribbon: the pH ribbon 4 is replaced in a whole roll, and the amount of each roll of the pH ribbon 4 is fixed; after each new roll of the pH ribbon 4 is placed on the pH ribbon disk 1, the control system 6 will reset the previous pH ribbon 4 transmission data and re-count. Since the pH ribbon 4 needs to be periodically suspended to ensure the smooth progress of the reagent titration detection operation, the consumption of the pH ribbon 4 is related to the number of times it is started or paused. After each transmission of the same distance, the pH ribbon 4 will be paused once. Therefore, under the premise that the transmission distance of the pH ribbon 4 is the same each time it is started, the number of transmissions faced by each roll of the pH ribbon 4 is fixed. The control system 6 will determine whether the pH ribbon 4 is exhausted based on the number of times the rotary drive device 1 is opened and closed after each reset, and promptly issue an alarm for the remaining amount of the pH ribbon to remind the user to replace the new pH ribbon 4.

[0074] In this embodiment, Figure 1 As shown, the aforementioned sample arrangement system specifically includes a collection pipeline 7, a dropper 10 and a rotary drive device 11. Among them, the sample inlet end of the collection pipeline 7 is connected to the aforementioned sample inlet system, and the dropper 10 is connected to the sample outlet end of the collection pipeline 7. The dropper 10 can titrate the reagent onto the pH ribbon 4 in the ribbon sampling area; the collection pipeline 7 is provided with a reagent flow meter 8 and a reagent thermometer 9. The reagent thermometer 9 can adopt an existing temperature sensor, which is used to detect the reagent temperature in real time and transmit the data to the control system 6 in real time, and can provide a temperature compensation basis for the pH measurement value. The reagent flow meter 8 is used to monitor the reagent flow in real time to accurately measure the titration volume of the reagent and improve the accuracy of the pH measurement value. The above-mentioned rotary drive device 2 11 is connected to the drip nozzle 10, and the rotary drive device 2 11 is also fixed on the aforementioned mounting carrier, and can drive the drip nozzle 10 to rotate (the rotation process does not affect the fluidity of the reagent or cleaning liquid flowing to the drip nozzle 10), so that the drip nozzle 10 switches between the first state and the second state, wherein, in the first state, the drip nozzle 10 is located above the pH ribbon 4 in the ribbon sample receiving area, and is perpendicular to the pH ribbon 4 in the ribbon sample receiving area, so as to titrate the reagent onto the pH ribbon 4, and in the second state, the drip nozzle 10 deviates from the pH ribbon 4 in the ribbon sample receiving area, at this time, the material in the drip nozzle 10 can be prevented from being discharged onto the pH ribbon 4, and the drip nozzle 10 is generally rinsed in the second state. The above-mentioned rotary drive device 2 11 preferably adopts a motor, which is connected to the control system 6 for communication, and the control system 6 can control the opening and closing and steering of the motor, thereby controlling the state of the drip nozzle 10. The above-mentioned drip nozzle 10 is an existing device, which is preferably fixed to the output shaft of the second rotating driving device 11 by means of a clamp, a fixing part, etc. When the output shaft of the second rotating driving device 11 rotates, the drip nozzle 10 rotates synchronously with the output shaft.

[0075] In this embodiment, Figure 1As shown, the above-mentioned pH value continuous online measurement system 100 also includes a cleaning system, which is used to clean the sample arrangement system before each test to prevent the previous test reagent from interfering with the current test. The cleaning system includes a cleaning liquid barrel 12, a cleaning liquid pipeline 14, a cleaning liquid pump 15 and a waste liquid collection device 16. A liquid level sensor 13 is arranged in the cleaning liquid barrel 12. One end of the cleaning liquid pipeline 14 is connected to the cleaning liquid barrel 12, and the other end is connected to the sample inlet end of the collection pipeline 7. The cleaning liquid pump 15 is arranged on the cleaning liquid pipeline 14. The cleaning liquid pump 15 is used to pump the cleaning liquid in the cleaning liquid barrel 12 into the drip nozzle 10 in the second state. The waste liquid collection device 16 is arranged below the pH ribbon 4 in the ribbon sample receiving area, and can collect the liquid leaked from the pH ribbon 4 and the reagent or flushing waste liquid discharged from the drip nozzle 10 in the second state. The above-mentioned waste liquid collection device 16 preferably includes a liquid receiving funnel and a liquid discharge pipeline connected to the bottom of the liquid receiving funnel. The liquid discharge pipeline is generally directly connected to the sewer, so that the waste liquid received by the waste liquid collection device 16 can be discharged through the sewer in time; the liquid receiving funnel is located directly below the pH color band 4 in the color band receiving area, and the liquid receiving area of ​​the large end of the liquid receiving funnel is generally larger than the area of ​​the pH color band 4 in the color band receiving area, so as to ensure that the edge of the liquid receiving funnel is located outside the pH color band 4. The liquid receiving funnel can receive the liquid leaked from the pH color band 4 itself, and can also receive the liquid discharged from the drip nozzle 10 in the second state, that is, no matter whether the drip nozzle 10 is in the first state or the second state, the liquid discharge range of the drip nozzle 10 is within the liquid receiving range of the liquid receiving funnel. The above-mentioned cleaning liquid pump 15 and liquid level sensor 13 are both connected to the control system 6 in communication. The liquid level sensor 13 can monitor and transmit the cleaning liquid level to the control system 6 in real time. The control system 6 can issue a liquid level remaining alarm according to the change of the cleaning liquid level.

[0076] In this embodiment, Figure 1As shown, the aforementioned sampling system includes a sample pipeline 17, a sample pump, a standard liquid barrel 19, a standard liquid barrel 20, a standard liquid pipeline 1 22, a standard liquid pump 1 23, a standard liquid pipeline 2 24 and a standard liquid pump 25, wherein one end of the sample pipeline 17 is used for externally connecting to a sample reagent supply device, and the other end is connected to the sampling end of the collecting pipeline 7, and the sample pump is arranged on the sample pipeline 17, and the sample pump is used to pump the sample reagent in the sample reagent supply device into the drip nozzle 10; at least one of the standard liquid barrel 19 and the standard liquid barrel 20 is provided with a liquid level sensor 21, and one end of the standard liquid pipeline 1 22 is connected to the sample reagent supply device. One end of the standard liquid pipeline 24 is connected to the standard liquid barrel 19, and the other end is connected to the sampling end of the collecting pipeline 7. The standard liquid pump 1 23 is arranged on the standard liquid pipeline 1 22. The standard liquid pump 1 23 is used to pump the standard liquid reagent 1 in the standard liquid barrel 19 into the drip nozzle 10. One end of the standard liquid pipeline 24 is connected to the standard liquid barrel 20, and the other end is connected to the sampling end of the collecting pipeline 7. The standard liquid pump 2 25 is arranged on the standard liquid pipeline 24. The standard liquid pump 2 25 is used to pump the standard liquid reagent 2 in the standard liquid barrel 20 into the drip nozzle 10; the above-mentioned sample pump, standard liquid pump 1 23 and standard liquid pump 2 25 are all communicatively connected to the control system 6. In order to accurately sense the liquid level changes of the standard liquid reagent in the standard liquid barrel 19 and the standard liquid barrel 20, a liquid level sensor 21 can be set in both the standard liquid barrel 19 and the standard liquid barrel 20. In addition, considering that the standard liquid barrel 19 and the standard liquid barrel 20 generally have the same volume, and the two alternately provide almost the same amount of standard liquid reagent to the drip nozzle 10, the liquid level changes of the standard liquid reagent in the standard liquid barrel 19 and the standard liquid barrel 20 are basically consistent. Therefore, in order to save equipment costs, only one of the standard liquid barrel 19 and the standard liquid barrel 20 is provided with a liquid level sensor 21. The liquid level sensor 21 can monitor and transmit the standard liquid level to the control system 6 in real time, and the control system 6 can issue a liquid level remaining alarm according to the change of the standard liquid level.

[0077] In this embodiment, the cleaning liquid pump 15, the sample pump, the standard liquid pump 1 23 and the standard liquid pump 2 25 are preferably peristaltic pumps.

[0078] In this embodiment, in order to ensure that the sample reagents reaching the collecting pipeline 7 are qualified, the sample reagents are generally pre-treated by filtering, cooling, and decompression before the sample reagents are introduced, so as to provide the system with reliable sample reagents and ensure that the system can measure the sample pH value in real time, stably, and accurately. In order to realize the pre-treatment functions of filtering, cooling, and decompression of the sample reagents, a sample filter device, an overflow cup, and other structures can be configured on the aforementioned sample pipeline 17 as needed.

[0079] Furthermore, in order to improve the integration of the pipelines in the entire pH continuous online measurement system 100, the cleaning liquid pipeline 14 and the sample pipeline 17 are preferably connected in parallel through a multi-way valve 18 and then connected to the injection end of the collecting pipeline 7 through a collecting branch. The multi-way valve 18 is preferably a three-way solenoid valve, and is communicatively connected to the control system 6. The control system 6 can control the working state of the three-way solenoid valve to switch the cleaning liquid and sample reagent to connect with the collecting pipeline 7. Based on the structure of the above-mentioned cleaning liquid pipeline 14 and the sample pipeline 17 being arranged in parallel, one of the cleaning liquid pump 15 and the sample pump can be omitted, and the other can be installed on the aforementioned collecting branch. Figure 1 As shown, the cleaning liquid pipeline 14 and the sample pipeline 17 share a cleaning liquid pump 15 to provide hydraulic power.

[0080] Furthermore, in order to eliminate or minimize the detection error caused by the mutual interference of reagents, it is preferred that the standard liquid pipeline 1 22, the standard liquid pipeline 24 and the sample pipeline 17 are arranged separately. Figure 1 As shown, in this embodiment, the above-mentioned collecting branch, standard liquid pipeline 1 22, standard liquid pipeline 2 24 and the sampling end of the collecting pipeline 7 are connected through a multi-way valve 1 38. The multi-way valve 1 38 is preferably a four-way solenoid valve, and is communicatively connected with the control system 6. The working state of the four-way solenoid valve can be controlled by the control system 6 to switch the liquids in different pipelines to connect with the collecting pipeline 7.

[0081] In this embodiment, Figure 1 As shown, the ribbon image acquisition system includes a light shield 26 and an image acquisition device 27. The light shield 26 is arranged in the ribbon sampling area, and the pH ribbon 4 in the ribbon sampling area moves through the light shield 26; the image acquisition device 27 is arranged in the light shield 26, and is used to perform image color acquisition on the pH ribbon 4 passing through the light shield 26; the image acquisition device 27 is communicatively connected with the control system 6. The image acquisition device 27 is preferably a camera; at the same time, in order to ensure the image acquisition effect, an illumination device 28 can also be arranged in the light shield 26 to assist the image acquisition device 27 in image acquisition.

[0082] In this embodiment, Figure 1As shown, the pH value continuous online measurement system 100 also includes a protection and purge system, which includes an airflow pipeline 29, an instrument protection shell and an environmental detection device. Among them, one end of the airflow pipeline 29 is used for external airflow supply device, and the other end is provided with an airflow nozzle 30. The airflow nozzle 30 is located above the pH ribbon 4 in the ribbon sample receiving area, and is used to timely purge the reagent on the pH ribbon 4; the airflow pipeline 29 is provided with an airflow pump 31, a gas purification device 32, a gas flow meter 33 and a pressure regulating solenoid valve 34. The gas purification device 32 is mainly used to filter the purge airflow to remove impurities, dust, moisture, carbon dioxide and other harmful gases, to ensure that the airflow ejected from the airflow nozzle is reliable and will not interfere with pH detection. The gas flow meter 33 and the pressure regulating solenoid valve 34 are used to measure the gas flow and adjust the gas pressure respectively. The aforementioned instrument protection housing has a closed space, which can be used as the aforementioned installation carrier. At least the aforementioned pH ribbon system and ribbon image acquisition system are arranged in the closed space, and the remaining structures can be arranged in or outside the instrument protection housing according to actual conditions; the environmental detection device is also arranged in the closed space of the aforementioned instrument protection housing. The environmental detection device can monitor the temperature, pressure and humidity in the closed space in real time, and send the monitoring data to the control system 6 in real time to provide the control system 6 with compensation and correction basis for the pH value measurement results. The aforementioned airflow pump 31, gas flow meter 33, pressure regulating solenoid valve 34 and environmental detection device are all connected to the control system 6 for communication.

[0083] In this embodiment, the above-mentioned environment detection device specifically includes a temperature sensor 35, a humidity sensor 36 and a pressure sensor 37. The temperature sensor 35, the humidity sensor 36 and the pressure sensor 37 are used to monitor the temperature, humidity and pressure in the closed space respectively.

[0084] In this embodiment, the control system 6 is an existing power supply, communication and data processing system, including a power supply module, a filter module, a rectifier module, a switching power supply and a signal receiving control board, a program and data processing output board, and the aforementioned rotating drive device 1 connected to the pH ribbon collection tray 2, a speed sensor 5, a reagent flow meter 8, a reagent thermometer 9, a rotating drive device 2 11, a liquid level sensor 1 13, a cleaning liquid pump 15, a multi-way valve 2 18, a liquid level sensor 2 21, a standard liquid pump 1 23, a standard liquid pump 2 25, an image acquisition device 27, an air flow pump 31, a gas flow meter 33, a pressure regulating solenoid valve 34 and an environmental detection device and other electrical components are all connected to the above-mentioned power supply and signal receiving control board and the program and data processing output board; the control system 6 can also be configured with corresponding communication output, input units, etc. The output control system 6 is mainly used for the power supply, component communication and control of the pH value continuous online measurement system 100, as well as data processing, analysis, storage, judgment, alarm and output functions to ensure the fully automated operation of the entire pH value continuous online measurement system 100.

[0085] In this embodiment, the pH ribbon 4 has high measurement accuracy, and preferably a narrow range high-precision pH paper tape is used.

[0086] When the above-mentioned pH value continuous online measurement system 100 is used, the test agent is titrated onto the pH ribbon 4 by the dropper 10, and the airflow nozzle 30 provides clean gas to quickly blow dry the residual reagent, and then the pH ribbon 4 is driven so that the part with the titrated reagent enters the light shield 26. The light shield 26 is provided with an illumination device 28 for assistance. With the help of the camera, a complete and accurate color image on the pH ribbon 4 can be collected, and finally the control system 6 performs image recognition, analysis and storage. The paper tape method using the pH ribbon 4 to measure the pH value has a wide range of applications and can be applied to harsh working conditions such as strong acid, strong alkali, and high salt, providing accurate and effective detection data for all working conditions.

[0087] The following is a detailed description of the pH value continuous online measurement method implemented by the pH value continuous online measurement system 100 proposed in this case in conjunction with a specific detection example.

[0088] (I) Fully automatic continuous detection method:

[0089] Pipeline flushing: Turn on the second rotary drive device 11, drive the drip nozzle 10 to rotate 60° and keep it, at this time the drip nozzle 10 is in the second state, the three-way solenoid valve is in the normally open state, turn on the cleaning liquid pump 15, the cleaning liquid enters the cleaning liquid pipeline 14 from the cleaning liquid barrel 12, and then passes through the three-way solenoid valve, the four-way solenoid valve, and the collecting pipeline 7 to reach the drip nozzle 10, and finally flows out from the drip nozzle 10. The cleaning duration of the cleaning liquid is about 5s;

[0090] Sample flushing: Move the three-way solenoid valve to the normally closed end, open the cleaning liquid pump 15, pump the qualified pre-treated sample reagent into the sample pipeline 17, and then pass through the three-way solenoid valve, the four-way solenoid valve, and the collecting pipeline 7 to reach the drip nozzle 10, and finally flow out from the drip nozzle 10. The sample cleaning lasts for about 5 seconds;

[0091] Sample titration and purging: Turn on the rotary drive device 11, drive the drip nozzle 10 to rotate 60° in the opposite direction and keep it, at this time the drip nozzle 10 switches to the first state, the reagent flow meter 8 and the reagent thermometer 9 monitor the sample reagent, the sample reagent flows out of the drip nozzle 10 and is titrated onto the pH ribbon 4 in the ribbon receiving area; turn off the cleaning liquid pump 15, and the three-way solenoid valve moves to the normally open state; turn on the airflow pump 31, and the airflow nozzle 30 provides clean gas to the pH ribbon 4 after titration to quickly blow off the residual reagent;

[0092] pH paper tape image acquisition and calculation: Turn on the rotary drive device 1 (stepper motor), and at the same time, the speed sensor 5 transmits data, and the control system 6 calculates the moving distance of the pH ribbon 4 until the pH ribbon 4 after titration moves into the light shield 26 and reaches the camera shooting position, then turn off the rotary drive device 1 (stepper motor), turn on the camera and the lighting device 28, and the camera focuses on taking a clear pH ribbon pattern and feeds back to the control system 6. The data processing system of the control system 6 extracts the image color at multiple points, and calculates the pH value after comprehensive compensation analysis with reference to the sample temperature, ambient temperature, ambient humidity and other data, and displays and outputs it through the communication transmission system;

[0093] After completing the above measurements, the instrument enters the next measurement cycle.

[0094] (II) Fully automatic two-point calibration detection method:

[0095] Pipeline flushing: Turn on the second rotary drive device 11, drive the drip nozzle 10 to rotate 60° and keep it, at this time the drip nozzle 10 is in the second state, the three-way solenoid valve is in the normally open state, turn on the cleaning liquid pump 15, the cleaning liquid enters the cleaning liquid pipeline 14 from the cleaning liquid barrel 12, and then passes through the three-way solenoid valve, the four-way solenoid valve, and the collecting pipeline 7 to reach the drip nozzle 10, and finally flows out from the drip nozzle 10. The cleaning duration of the cleaning liquid is about 5s, and the cleaning liquid pump 15 is turned off;

[0096] Standard solution reagent flushing: open the standard solution pump 23, pump the standard solution reagent in the standard solution barrel 19 into the standard solution pipeline 22, and then pass through the four-way solenoid valve and the collecting pipeline 7 to reach the drip nozzle 10, and finally flow out from the drip nozzle 10. The standard solution cleaning lasts for about 5 seconds;

[0097] Titration and purging of the standard liquid reagent 1: Turn on the rotary drive device 2 11, drive the drip nozzle 10 to rotate 60° in the opposite direction and keep it, at this time the drip nozzle 10 switches to the first state, the reagent flow meter 8 and the reagent thermometer 9 monitor the standard liquid reagent 1, the standard liquid reagent 1 flows out of the drip nozzle 10 and is titrated onto the pH ribbon 4 in the ribbon receiving area; turn off the standard liquid pump 1 23, turn on the airflow pump 31, and the airflow nozzle 30 provides clean gas to the pH ribbon 4 after titration to quickly blow off the residual standard liquid;

[0098] Image acquisition and calculation of standard solution reagent 1: Turn on the rotary drive device 1 (stepper motor), and at the same time, the speed sensor 5 transmits data, and the control system 6 calculates the moving distance of the pH ribbon 4 until the pH ribbon 4 after titration moves into the light shield 26 and reaches the camera shooting position, then turn off the rotary drive device 1 (stepper motor), turn on the camera and the lighting device 28, and the camera focuses on shooting a clear pH ribbon pattern and feeds back to the control system 6. The data processing system of the control system 6 extracts the image color at multiple points, and calculates the pH value of the standard solution reagent 1 after comprehensive compensation analysis with reference to the standard solution temperature, ambient temperature, ambient humidity and other data, and the data is saved;

[0099] Flushing of standard liquid reagent 2: Open the standard liquid pump 25, pump the standard liquid reagent 2 in the standard liquid barrel 20 into the standard liquid pipeline 24, and then pass through the four-way solenoid valve and the collecting pipeline 7 to reach the drip nozzle 10, and finally flow out from the drip nozzle 10. The standard liquid cleaning lasts for about 5 seconds;

[0100] Titration and purging of standard liquid reagent 2: Turn on the second rotary drive device 11, drive the drip nozzle 10 to rotate 60° in the opposite direction and keep it, at this time the drip nozzle 10 switches to the first state, the reagent flow meter 8 and the reagent thermometer 9 monitor the standard liquid reagent 2, the standard liquid reagent 2 flows out of the drip nozzle 10 and is titrated onto the pH ribbon 4 in the ribbon sample receiving area; turn off the second standard liquid pump 25, turn on the airflow pump 31, and the airflow nozzle 30 provides clean gas to the pH ribbon 4 after titration to quickly blow off the residual standard liquid;

[0101] Image acquisition and calculation of standard solution reagent 2: Turn on the rotation drive device 1 (stepper motor), and at the same time, the speed sensor 5 transmits data, and the control system 6 calculates the moving distance of the pH ribbon 4 until the pH ribbon 4 after titration moves into the light shield 26 and reaches the camera shooting position, then turn off the rotation drive device 1 (stepper motor), turn on the camera and lighting device 28, and the camera focuses on shooting a clear pH ribbon pattern and feeds back to the control system 6. The data processing system of the control system 6 extracts the image color at multiple points, and calculates the pH value of the standard solution reagent 2 after comprehensive compensation analysis with reference to the standard solution temperature, ambient temperature, ambient humidity and other data, and the data is saved;

[0102] The pH values ​​of the standard solution reagent 1 and the standard solution reagent 2 form a linear relationship in the data processing system of the control system 6, which is stored by the storage unit of the control system 6 and determined as the calibration result, which serves as a reference for measurement before the next calibration.

[0103] It can be seen that the pH value continuous online measurement system and pH value continuous online measurement method proposed by the utility model adopt pH color strips to replace the existing pH meter electrodes, thereby realizing fully automatic continuous online measurement of pH. It can not only meet the needs of continuous online measurement of pH value under harsh media conditions such as strong acid, strong alkali, and high salt, but also save the maintenance and replacement costs of pH meter electrodes on the basis of ensuring detection accuracy, and significantly solve the problems of existing pH meters in measuring harsh media conditions such as strong acid, strong alkali, and high salt, and is suitable for special working conditions in the pharmaceutical, petroleum, chemical, electric power, new energy and other industries.

[0104] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A pH value continuous online measurement system, characterized in that: include: The pH ribbon system comprises a ribbon retracting device 1 and a ribbon retracting device 2, wherein one of the ribbon retracting device 1 and the ribbon retracting device 2 is used to release the pH ribbon (4), and the other is used to retract the pH ribbon (4) to achieve the transmission of the pH ribbon (4); a ribbon receiving area and a ribbon sampling area are sequentially arranged between the ribbon retracting device 1 and the ribbon retracting device 2 along the transmission direction of the pH ribbon (4); A sample injection system for providing a reagent for measuring pH; A sample discharge system connected to the sample introduction system, wherein the sample discharge system is capable of discharging the reagent onto the pH color ribbon (4) in the color ribbon receiving area; A color ribbon image acquisition system is arranged in the color ribbon sampling area, and the color ribbon image acquisition system is used to acquire the image color of the pH color ribbon (4) after the reaction; The control system (6) is communicatively connected with the pH ribbon system, the sample introduction system, the sample discharge system, and the ribbon image acquisition system to achieve continuous online measurement of the pH value of the reagent.

2. The pH value continuous online measurement system according to claim 1, characterized in that: The ribbon retracting device 1 comprises a pH ribbon reel (1) on which the pH ribbon (4) is wound; the ribbon retracting device 2 comprises a pH ribbon collecting reel (2) and a rotary drive device 1 connected to the pH ribbon collecting reel (2), the rotary drive device 1 being used to drive the pH ribbon collecting reel (2) to rotate so as to reel in the pH ribbon (4) released from the pH ribbon reel (1); the rotary drive device 1 is communicatively connected to the control system (6).

3. The pH value continuous online measurement system according to claim 2, characterized in that: The pH ribbon system further comprises a speed sensor (5) which is communicatively connected to the control system (6), wherein the speed sensor (5) is arranged on at least one of the pH ribbon collecting disk (2), the pH ribbon disk (1) and the rotating drive device, or the speed sensor (5) is arranged on one side of the pH ribbon (4), and the speed sensor (5) is capable of detecting the transmission rate of the pH ribbon (4).

4. The pH value continuous online measurement system according to any one of claims 1 to 3, characterized in that: The sample arrangement system comprises: A collecting pipeline (7) on which a reagent flow meter (8) and / or a reagent thermometer (9) are arranged, and the injection end of the collecting pipeline (7) is connected to the injection system; A dropper (10) connected to the sample outlet end of the collecting pipe (7), the dropper (10) being capable of titrating the reagent onto the pH color strip (4); A second rotary drive device (11) is connected to the drip nozzle (10), and the second rotary drive device (11) can drive the drip nozzle (10) to rotate so that the drip nozzle (10) switches between a first state and a second state, wherein in the first state, the drip nozzle (10) is located above the pH ribbon (4) in the ribbon sample connection area so as to titrate the reagent onto the pH ribbon (4), and in the second state, the drip nozzle (10) deviates from the pH ribbon (4) in the ribbon sample connection area so as to avoid the discharge of substances in the drip nozzle (10) onto the pH ribbon (4); the second rotary drive device (11) is communicatively connected to the control system (6).

5. The pH value continuous online measurement system according to claim 4, characterized in that: Also included is a cleaning system, the cleaning system comprising: A cleaning liquid barrel (12) having a liquid level sensor (13) disposed therein; A cleaning liquid pipeline (14), one end of which is connected to the cleaning liquid barrel (12), and the other end of which is connected to the injection end of the collecting pipeline (7); a cleaning liquid pump (15) disposed on the cleaning liquid pipeline (14), the cleaning liquid pump (15) being used to pump the cleaning liquid in the cleaning liquid barrel (12) into the drip nozzle (10) in the second state; a waste liquid collecting device (16), arranged below the pH ribbon (4) in the ribbon sample receiving area, capable of collecting liquid leaking from the pH ribbon (4) and liquid discharged from the drip nozzle (10) in the second state; The cleaning liquid pump (15) and the liquid level sensor (13) are both communicatively connected to the control system (6).

6. The pH value continuous online measurement system according to claim 4, characterized in that: The injection system comprises: A sample pipeline (17), one end of which is used to be connected to an external sample reagent supply device, and the other end of which is connected to the sample inlet end of the collecting pipeline (7); A sample pump, arranged on the sample pipeline (17), and used for pumping the sample reagent into the drip nozzle (10); A first standard liquid barrel (19) and a second standard liquid barrel (20), wherein at least one of the first standard liquid barrel (19) and the second standard liquid barrel (20) is provided with a second liquid level sensor (21); A standard liquid pipeline (22), one end of which is connected to the standard liquid barrel (19), and the other end of which is connected to the sample inlet end of the collecting pipeline (7); A standard liquid pump (23) is arranged on the standard liquid pipeline (22), and the standard liquid pump (23) is used to pump the standard liquid reagent in the standard liquid barrel (19) into the drip nozzle (10); A second standard liquid pipeline (24), one end of which is connected to the second standard liquid barrel (20), and the other end of which is connected to the injection end of the collecting pipeline (7); A second standard liquid pump (25) is arranged on the second standard liquid pipeline (24), and the second standard liquid pump (25) is used to pump the second standard liquid reagent in the second standard liquid barrel (20) into the drip nozzle (10); The sample pump, the standard solution pump 1 (23) and the standard solution pump 2 (25) are all communicatively connected to the control system (6).

7. The pH value continuous online measurement system according to any one of claims 1 to 3, characterized in that: The ribbon image acquisition system comprises: A light shield (26) is arranged in the color ribbon sampling area, and the pH color ribbon (4) in the color ribbon sampling area moves through the light shield (26); An image acquisition device (27) is arranged in the light shield (26) and is used to acquire the color image of the pH color strip (4) entering the light shield (26); the image acquisition device (27) is communicatively connected with the control system (6).

8. The pH value continuous online measurement system according to claim 7, characterized in that: A lighting device (28) is also provided inside the light shield (26).

9. The pH value continuous online measurement system according to any one of claims 1 to 3, characterized in that: Also included is a protection and purge system, the protection and purge system comprising: An air flow pipeline (29), one end of which is used to be connected to an external air flow supply device, and the other end of which is provided with an air flow nozzle (30), the air flow nozzle (30) being located above the pH ribbon (4) in the ribbon sample receiving area and used to purge the reagent on the pH ribbon (4); the air flow pipeline (29) is provided with an air flow pump (31), a gas purification device (32), a gas flow meter (33) and a pressure regulating solenoid valve (34); An instrument protective housing having a closed space, wherein the pH ribbon system and the ribbon image acquisition system are both arranged in the closed space; The air flow pump (31), the gas flow meter (33) and the pressure regulating solenoid valve (34) are all communicatively connected to the control system (6).

10. The pH value continuous online measurement system according to claim 9, characterized in that: The protection and purging system also includes an environment detection device, which is arranged in the closed space and can monitor the temperature, pressure and / or humidity in the closed space; the environment detection device is communicatively connected to the control system (6).

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