Laboratory pure water tank water quality degradation prevention monitoring method and water storage device

Abstract

The invention belongs to the field of water treatment equipment, and particularly relates to a laboratory pure water tank water quality degradation prevention monitoring method which comprises the following steps: (1) setting the highest water inlet conductivity required by a pure water tank as sigma standard, setting the water storage conductivity of the pure water tank as sigma standard ', and setting the sigma standard to be smaller than the sigma standard'; (2) detecting the water inlet conductivity of the pure water tank in real time and recording the conductivity as sigma sample, and detecting the water storage conductivity of the pure water tank in real time and recording the conductivity as sigma sample '; (3) if the sigma sample is greater than the sigma standard, starting a drainage program, so that the pure water prepared by the water purifier does not enter the pure water tank, and meanwhile, giving an alarm; and (4) if the sigma sample'is greater than the sigma standard ', starting an emptying program, emptying water stored in the pure water tank, and then starting a water production program of the water purifier. The invention further relates to a water storage device. According to the laboratory pure water tank water quality degradation prevention monitoring method and the water storage device, a series of problems caused by laboratory pure water tank water quality degradation can be effectively prevented and controlled.

Description

Technical Field

[0001] The invention belongs to the field of water treatment equipment, and in particular relates to a monitoring method for preventing water quality deterioration in a laboratory pure water tank and a water storage device. Background Art

[0002] Laboratory pure water systems are divided into pure water systems and ultrapure water systems according to water quality. Laboratory pure water systems generally refer to scientific instruments that use tap water as inlet water and adopt water purification methods such as deep filtration, reverse osmosis, and ion exchange to prepare pure water for laboratory use. Laboratory ultrapure water systems generally refer to instruments that use pure water as inlet water and adopt purification methods such as artificial carbon microspheres, ion exchange, and ultraviolet light to prepare ultrapure water for laboratory use. In scientific research, pure water is mainly used for analytical experiments with general water quality requirements, and ultrapure water is used for high-end precision analytical experiments.

[0003] Since ultrapure water has high requirements for water quality, it generally needs to be prepared in real time and used immediately, so the water production speed is fast. The current mainstream water production speed is 1.5L / min to 2L / min. However, the water production speed of pure water is generally much lower than that of ultrapure water. The common model is 5L / hr to 15L / hr, which cannot provide the pure water volume required for the real-time preparation of ultrapure water. Therefore, a pure water tank must be used between the pure water system and the ultrapure water system as a necessary buffer.

[0004] In order to ensure the quality of pure water in the pure water tank, the common practice in the industry is to connect the pure water tank to the outside world through a respirator (air filter) to ensure that all dust is filtered out. Sometimes soda lime is added to the respirator to remove carbon dioxide; and ultraviolet lamps are added to the pure water tank and turned on regularly for sterilization.

[0005] However, the above methods are passive and indirect, and cannot guarantee that the water in the pure water tank meets the specific water quality requirements, especially after the water in the pure water tank has been stored for a long time, it is even more difficult to ensure that it meets the water quality requirements. When in use, if the ultrapure water preparation system finds that the water in the pure water tank does not meet the water inlet requirements, then the water in the pure water tank can only be emptied, and then the pure water machine can re-prepare water that meets the requirements and inject it into the water tank. The whole process is time-consuming and laborious, which will seriously delay the experiment and detection research work of water use. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a monitoring method and a water storage device for preventing water quality deterioration in a laboratory pure water tank, which can effectively prevent and control a series of problems caused by water quality deterioration in the laboratory pure water tank.

[0007] In order to solve the above technical problems, the purpose of the present invention is achieved through the following technical solutions:

[0008] A method for monitoring the water quality of a laboratory pure water tank to prevent deterioration, comprising the following steps:

[0009] (1) According to the actual water demand of the laboratory, set the maximum inlet water conductivity required by the pure water tank, denoted as σ 标 , set the water storage conductivity of the pure water tank, denoted as σ 标 ', and σ 标 Less than σ 标 ';

[0010] (2) Real-time detection of the inlet conductivity of the pure water tank, denoted as σ 样 , real-time detection of the water conductivity of the pure water tank, denoted as σ 样 ';

[0011] (3) If σ 样 Greater than σ 标 , the drainage program is started so that the pure water prepared by the pure water machine does not enter the pure water tank, and an alarm is sounded at the same time;

[0012] (4) If σ 样 ' is greater than σ 标 ', then start the emptying program to empty the water in the pure water tank, and then start the water production program of the pure water machine.

[0013] In the above-mentioned monitoring method for preventing water quality deterioration in a laboratory pure water tank, the water level in the pure water tank is monitored by a liquid level sensor, and the water production program of the pure water machine is started by water level monitoring or by an emptying program;

[0014] When the water level in the pure water tank is lower than the preset lower limit, the water production program of the pure water machine is started to fill the pure water tank. When the water level reaches the preset upper limit, the water production is stopped.

[0015] After starting the emptying program to empty the water in the pure water tank, start the water production program of the pure water machine and fill the pure water tank with water. When the water level reaches the preset upper limit value, stop producing water. When using the emptying program to start the water production program of the pure water machine, if the water level in the pure water tank is lower than the preset lower limit value, the water production program will not start.

[0016] In the above-mentioned method for monitoring the water quality of a laboratory pure water tank against deterioration, the σ 标 Set to 0.1μs / cm, the σ 标 'Set to 0.3μs / cm; This indicator is used in laboratories with high water requirements (such as national laboratory first-level water standards).

[0017] In the above-mentioned method for monitoring the water quality of a laboratory pure water tank against deterioration, the σ 标 is set to 0.2μs / cm, the σ 标'Set to 1.0μs / cm; This indicator is used in laboratories with lower water requirements (such as the national laboratory secondary water standard). When a lower setting value is used, the life of consumables can also be extended.

[0018] In the above-mentioned monitoring method for preventing water quality deterioration in a laboratory pure water tank, the above-mentioned σ 标 and σ 标 'The set value can be adjusted through the control panel; further, the control panel is preferably a human-computer interaction interface with a touch screen.

[0019] In the above-mentioned method for monitoring the water quality of a laboratory pure water tank against deterioration, the method further comprises:

[0020] (5) a replaceable water quality assurance device is provided in the pure water tank, wherein the water quality assurance device is used to slow down the deterioration of the water quality in the pure water tank;

[0021] (6) When the water quality assurance device is in a new state, the conductivity of the water in the pure water tank is detected at different time points. The deterioration curve of the water quality over time is drawn with the resistivity corresponding to the conductivity as the ordinate and the time as the abscissa. The conductivity of the water quality is recorded by σ 标 Arrival 标 ', denoted as T 标 ;

[0022] (7) Daily monitoring of water quality by σ 标 Arrival 标 ', denoted as T 样 , when T 样 Less than T 标 When the water quality assurance device is replaced, an alarm is sounded when the water quality assurance device is replaced, and n is greater than 2.

[0023] In the above-mentioned method for monitoring the water quality of a laboratory pure water tank to prevent deterioration, the water quality assurance device is selected from an air filtration device (such as an air filter), a carbon dioxide adsorption device (such as filled with soda lime), a sterilization device (such as an ultraviolet lamp), etc.

[0024] In the above-mentioned method for monitoring the water quality of a laboratory pure water tank to prevent deterioration, preferably, the value of n is 4.

[0025] In the above-mentioned method for monitoring the water quality of a laboratory pure water tank against deterioration, the method further comprises:

[0026] (8) A deionization column (DI column) is set on one side of the water tank. After the deteriorated water produced in step (4) is discharged, it is filtered through the deionization column and then connected to the pure water tank. After the water in the pure water tank is continuously purified, its storage water conductivity σ 样 'Continue to decline to σ样 ' is equal to σ 标 'Stop the cycle; the water cycle is driven by a recovery pump; when the recovery program is used, the water production program in step (4) is not started.

[0027] (9) Record the amount of water passing through the deionization column, denoted as Q 样 , and set the water storage capacity of the water storage tank, recorded as Q 标 , calculate the number of cycles = Q 样 / Q 标 The lower the number of cycles, the better the purification effect of the deionization column. When the number of cycles is greater than the set number, the deionization column should be replaced.

[0028] The present invention also provides a laboratory pure water storage device, which uses the above-mentioned laboratory pure water tank water quality prevention and deterioration monitoring method to monitor water quality.

[0029] In the above-mentioned laboratory pure water storage device, it includes a pure water tank, and the bottom of the pure water tank is provided with a water inlet, a water outlet and an emptying port connected to the inner cavity of the pure water tank, the water inlet is connected to the water inlet pipe of the water tank, the water outlet is connected to the water outlet pipe of the water tank, and the emptying port can be optionally installed with a water tank emptying valve, the water tank inlet pipe is connected to the water production pipe of the pure water machine through the water inlet three-way valve, and the water tank outlet pipe is connected to the water supply pipe of the ultrapure water machine through the water outlet three-way valve, the third end of the water inlet three-way valve is connected to the drain pipe, and the third end of the water outlet three-way valve is connected to the recovery pipe, the water inlet three-way valve is provided with an inlet water conductivity sensor, and the water outlet joint is provided with a storage water conductivity sensor; the inlet water conductivity sensor and the storage water conductivity sensor are both electrically connected to the controller, and the inlet three-way valve, the water outlet three-way valve and the water tank emptying valve are all controlled by the controller.

[0030] In the above-mentioned laboratory pure water storage device, a deionization column is arranged on one side of the pure water tank, the water inlet of the deionization column is connected to the recovery pipe, the water outlet of the deionization column is connected to the emptying port, and the recovery pipe is provided with a recovery pump for driving water circulation, such as a peristaltic pump.

[0031] In the above-mentioned laboratory pure water storage device, a water tap is arranged on the side of the pure water tank.

[0032] In the above-mentioned laboratory pure water storage device, the upper cover of the pure water tank is provided with a box cover, and the box cover is installed with a water level sensor and an air filter extending downward to the inner cavity of the pure water tank, and the air filter is filled with soda lime.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The present invention provides a monitoring method for preventing water quality deterioration in a laboratory pure water tank. By monitoring the inlet water conductivity and storage water conductivity of the pure water tank, the water quality deterioration in the pure water tank is monitored in an active manner, and the water quality in the pure water tank is actively coordinated with the pure water machine to ensure the water quality in the pure water tank. The water is often replaced to ensure that it always meets specific water quality requirements, thereby avoiding the time loss caused by replacing the water storage in the water tank before use.

[0035] 2. The traditional way to replace water tank consumables is the time method, which is to replace them after a fixed period of use, such as one year. However, the use of consumables is closely related to the air environment, water source conditions, and frequency of use. The time method cannot accurately judge the actual use of consumables, resulting in unsatisfactory water quality or waste of consumables. The present invention provides a new consumables monitoring method, which judges the actual use of consumables by the deterioration of water quality over time, so that the use status of consumables can be accurately monitored.

[0036] 3. The parameters of water quality monitoring and consumables monitoring of the present invention can be adjusted and can be selected according to actual needs. When the water quality requirements are relatively low, a relatively large σ is used. 标 , σ 标 ' and n value to save costs and consumables; when the water quality requirements are relatively high, a relatively small σ 标 , σ 标 ' and n value to obtain pure water and ultrapure water with higher water quality requirements.

[0037] 4. The present invention further provides a method for recovering deteriorated water and a method for monitoring the use status of a deionization column used for recovery.

[0038] 5. The present invention further provides a laboratory pure water storage device, which can conveniently implement the above monitoring method; the sensor of the present invention is arranged in the valve body or the joint, which is convenient for installation and can accurately detect the required conductivity data. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a three-dimensional diagram of the laboratory pure water storage device (emptying type) of the present invention;

[0040] Figure 2 It is a cross-sectional view of the laboratory pure water storage device (emptying type) of the present invention;

[0041] Figure 3 It is a three-dimensional diagram of the laboratory pure water storage device (recovery type) of the present invention;

[0042] Figure 4 It is a cross-sectional view of the laboratory pure water storage device (recovery type) of the present invention;

[0043] Figure 5It is a logic diagram of the monitoring method of the present invention (emptying type);

[0044] Figure numerals: 1. pure water tank; 2. water inlet; 3. water outlet; 4. drain port; 5. water tank inlet pipe; 6. water tank outlet pipe; 7. water tank drain valve; 8. water inlet three-way valve; 9. water production pipe; 10. water outlet three-way valve; 11. water supply pipe; 12. drain pipe; 13. recovery pipe; 14. water inlet conductivity sensor; 15. water storage conductivity sensor; 16. deionization column; 17. recovery pump; 18. water tap; 19. tank cover; 20. water level sensor; 21. air filter. DETAILED DESCRIPTION

[0045] The present invention is further illustrated below through the description of specific implementation methods, but this is not a limitation of the present invention. Those skilled in the art can make various modifications or improvements based on the basic idea of ​​the present invention, but as long as they do not deviate from the basic idea of ​​the present invention, they are all within the scope of the present invention.

[0046] Unless otherwise specified, all raw materials and reagents used in the examples of the present invention were purchased from commercial sources.

[0047] Example 1

[0048] Laboratory pure water storage device (empty type)

[0049] Compare with Figure 1 and attached Figure 2 A laboratory pure water storage device comprises a pure water tank 1, wherein the bottom of the pure water tank 1 is provided with a water inlet 2, a water outlet 3 and an emptying port 4 which are connected to the inner cavity of the pure water tank 1, wherein the water inlet 2 is connected to a water tank inlet pipe 5, the water outlet 3 is connected to a water tank outlet pipe 6, and the emptying port 4 is provided with a water tank emptying valve 7, wherein the water tank inlet pipe 5 is connected to a water production pipe 9 of a pure water machine through a water inlet three-way valve 8, and the water tank outlet pipe 6 is connected to a water supply pipe 11 of an ultrapure water machine through a water outlet three-way valve 10, the third end of the water inlet three-way valve 8 is connected to a drain pipe 12, the third end of the water outlet three-way valve 10 is connected to a recovery pipe 13, and the water inlet pipe 5 is connected to a water supply pipe 9 of a pure water machine through a water inlet three-way valve 8, the water tank outlet pipe 6 is connected to a water supply pipe 11 of an ultrapure water machine through a water outlet three-way valve 10, the third end of the water inlet three-way valve 8 is connected to a drain pipe 12, the third end of the water outlet three-way valve 10 is connected to a recovery pipe 13, ... An inlet water conductivity sensor 14 is arranged in the water three-way valve 8, and a storage water conductivity sensor 15 is arranged in the water outlet 3 joint; the inlet water conductivity sensor 14 and the storage water conductivity sensor 15 are both electrically connected to the controller, and the inlet water three-way valve 8, the outlet water three-way valve 10 and the water tank drain valve 7 are all controlled by the controller; the inlet water conductivity sensor 14 and the storage water conductivity sensor 15 respectively detect the conductivity of the inlet water and the conductivity of the storage water, and transmit the conductivity data to the controller, and the controller controls the start and stop of the inlet water three-way valve 8, the outlet water three-way valve 10 and the water tank drain valve 7 according to the received data.

[0050] A water tap 18 is disposed on the side of the pure water tank 1 . When the pure water in the pure water tank 1 needs to be used directly, the water can be taken through the water tap 18 .

[0051] The pure water tank 1 is provided with a tank cover 19, on which a water level sensor 20 and an air filter 21 extending downward to the inner cavity of the pure water tank 1 are installed, and the air filter 21 is filled with soda lime. The water level sensor 20 is located to monitor the water level in the pure water tank 1, and the air filter 21 is used to filter air and absorb carbon dioxide to delay the deterioration of the water in the pure water tank 1.

[0052] Example 2

[0053] Laboratory pure water storage device (recycling type)

[0054] Compare with Figure 3 and attached Figure 4

[0055] This embodiment is basically the same as the water storage device in embodiment 1, except that this embodiment does not have a drain valve, and the inferior water in the pure water tank 1 is not directly drained through the drain valve, but is recovered through a recovery device. The specific recovery device is: a deionization column 16 is provided on one side of the pure water tank 1, the water inlet of the deionization column 16 is connected to the recovery pipe 13, the water outlet of the deionization column 16 is connected to the drain port 4, and a recovery pump 17 for driving water circulation, such as a peristaltic pump, is provided on the recovery pipe 13; the water storage conductivity sensor 15 detects the conductivity of the stored water and transmits the conductivity data to the controller, and the controller controls the start and stop of the recovery pump 17 according to the received data.

[0056] Example 3

[0057] Monitoring method for preventing water quality deterioration in pure water tanks of national laboratory primary water standards

[0058] Compare with Figure 5 This embodiment is completed by the laboratory pure water storage device in Example 1.

[0059] A method for monitoring the water quality of a pure water tank to prevent deterioration, specifically comprising the following steps:

[0060] (1) According to the actual water demand of the laboratory, set the inlet conductivity of the pure water tank, denoted as σ 标 , set the water storage conductivity of the pure water tank, denoted as σ 标 ', and σ 标 Less than σ 标 ', in this embodiment, the σ 标 Set to 0.1μs / cm, the σ 标'Set to 0.3μs / cm, this data setting is completed through the human-computer interaction interface;

[0061] (2) The inlet water conductivity sensor is used to detect the inlet water conductivity of the pure water tank in real time, denoted as σ 样 , the water conductivity of the pure water tank is detected in real time through the water conductivity sensor, denoted as σ 样 ';

[0062] (3) When the water purifier produces water, if σ 样 Greater than σ 标 , start the drainage program, control the water inlet three-way valve to cut off the connection between the water production pipe of the water purifier and the water inlet pipe of the water tank, and directly discharge the pure water prepared by the water purifier through the drainage pipe, so that the pure water prepared by the water purifier does not enter the pure water tank, and sound an alarm at the same time;

[0063] (4) In daily monitoring, if σ 样 ' is greater than σ 标 ', the emptying program is started, the emptying valve is controlled to open, the water stored in the pure water tank is emptied, and then the water production program of the pure water machine is started.

[0064] The water level in the above-mentioned pure water tank is monitored by a liquid level sensor, and the water production program of the water purifier is started by the water level monitoring or by the emptying program;

[0065] When the water level in the pure water tank is lower than the preset lower limit, the water production program of the pure water machine is started to fill the pure water tank. When the water level reaches the preset upper limit, the water production is stopped.

[0066] After starting the emptying program to empty the water in the pure water tank, start the water production program of the pure water machine and fill the pure water tank with water. When the water level reaches the preset upper limit, stop producing water. When using the emptying program to start the water production program of the pure water machine, if the water level in the pure water tank is lower than the preset lower limit, the water production program will not start, so as to prevent the situation of producing water while draining water.

[0067] Example 4

[0068] Monitoring method for preventing water quality deterioration in pure water tanks of national laboratory secondary water standards

[0069] Compare with Figure 3 This embodiment is completed by the laboratory pure water storage device in Example 1.

[0070] The method of this embodiment is similar to that of embodiment 3, but in step (1), the σ 标 is set to 0.2μs / cm, the σ 标 ' is set to 1.0μs / cm, and this data setting is completed through the human-computer interaction interface.

[0071] Example 5

[0072] Method for monitoring consumables of laboratory pure water tanks

[0073] This embodiment is completed by the laboratory pure water storage device in Example 1

[0074] The water stored in the laboratory pure water tank will inevitably deteriorate over time. The degradation curve of the water quality over time is drawn with the resistivity corresponding to the conductivity as the ordinate and the time as the abscissa. The degradation law is that the water quality will deteriorate rapidly in the initial stage, and then the degradation rate will slow down, and the resistivity will gradually approach the X-axis. In this embodiment, the initial value of the resistivity is 10MΩ·cm, which drops to 5MΩ·cm in about 6 hours and drops to 1MΩ·cm after 48 hours.

[0075] By real-time monitoring of the real-time conductivity in the pure water tank, the degradation rate of the stored water can be determined. In addition, since the degradation rate of the stored water is directly related to the use status of the consumables (water quality assurance device), the use status of the consumables can be determined by detecting the degradation rate of the stored water. For example, in the state of brand new consumables, the time for the resistivity to drop from 10MΩ·cm to 5MΩ·cm is 6 hours. After a period of use, when the state of the consumables decreases, the time for the resistivity to drop from 10MΩ·cm to 5MΩ·cm will also decrease, and the decrease will be large. The lower limit of the qualified use status of the consumables will correspond to a time value. Therefore, when the time value is lower than the lower limit time value, it means that the consumables cannot achieve the performance of the qualified state and need to be replaced in time.

[0076] Specifically, in the new state of the water quality assurance device, the conductivity of the stored water quality is recorded by σ 标 Arrival 标 ', denoted as T 标 ;

[0077] After the water quality of the storage water reaches σ 标 Start timing when the inlet water quality itself is equal to σ 标 , the timing starts immediately. When the water quality reaches σ 标 ', the timing stops (the water storage also needs to be drained at this time), and the water quality of the water storage is determined by σ 标 Arrival 标 ', denoted as T 样 , when T 样 Less than T 标 When the water quality assurance device is replaced, an alarm is sounded when the water quality assurance device is replaced, and n is greater than 2.

[0078] The selection of n value can be determined according to the actual demand for water. Generally speaking, the higher the demand for water, the lower the n value is set.样 If it is less than 3 hours, the consumables need to be replaced.

[0079] Example 6

[0080] Methods for recovering laboratory pure water tanks after deterioration and monitoring of their consumables.

[0081] This embodiment is completed by the laboratory pure water storage device in Example 2

[0082] After the degraded water produced in step (4) is discharged, it is filtered through a deionizing column and then connected to a pure water tank. After continuous purification, the water in the pure water tank has a water conductivity σ 样 'Continue to decline to σ 样 ' is equal to σ 标 'Stop the cycle; the water cycle is driven by a recovery pump; when the recovery program is used, the water production program in step (4) is not started.

[0083] The monitoring method of the consumable deionization column is: record the amount of water passing through the deionization column, recorded as Q 样 , and set the water storage capacity of the water storage tank, recorded as Q 标 , calculate the number of cycles = Q 样 / Q 标 The lower the number of cycles, the better the purification effect of the deionization column. When the number of cycles is greater than the set number, the deionization column should be replaced.

[0084] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the present invention should be included in the protection scope of the present invention.

Claims

1. A method for monitoring the water quality of a laboratory pure water tank against deterioration, characterized in that: The following steps are involved: (1) According to the actual water demand of the laboratory, set the maximum inlet water conductivity required by the pure water tank, denoted as σ 标 , set the water storage conductivity of the pure water tank, denoted as σ 标 ′, and σ 标 Less than σ 标 ′; (2) Real-time detection of the inlet conductivity of the pure water tank, denoted as σ 样 , real-time detection of the water conductivity of the pure water tank, denoted as σ 样 ′; (3) If σ 样 Greater than σ 标 , the drainage program is started so that the pure water prepared by the pure water machine does not enter the pure water tank, and an alarm is sounded at the same time; (4) If σ 样 ' is greater than σ 标 ', then start the emptying program to empty the water in the pure water tank, and then start the water production program of the pure water machine, or purify the water in the pure water tank.

2. A method for monitoring the water quality of a laboratory pure water tank against deterioration according to claim 1, characterized in that: The water level in the pure water tank is monitored by a liquid level sensor, and the water production program of the pure water machine is started by the water level monitoring or the emptying program; When the water level in the pure water tank is lower than the preset lower limit, the water production program of the pure water machine is started to fill the pure water tank. When the water level reaches the preset upper limit, the water production is stopped. After starting the emptying program to empty the water in the pure water tank, start the water production program of the pure water machine and fill the pure water tank with water. When the water level reaches the preset upper limit value, stop producing water. When using the emptying program to start the water production program of the pure water machine, if the water level in the pure water tank is lower than the preset lower limit value, the water production program will not start.

3. A method for monitoring the water quality of a laboratory pure water tank against deterioration according to claim 1, characterized in that: The σ 标 Set to 0.1μs / cm, the σ 标 'Set to 0.3μs / cm.

4. A method for monitoring the water quality of a laboratory pure water tank against deterioration according to claim 1, characterized in that: The σ 标 is set to 0.2μs / cm, the σ 标 'Set to 1.0μs / cm.

5. A method for monitoring the water quality of a laboratory pure water tank against deterioration according to claim 1, characterized in that: The method further comprises: (5) a replaceable water quality assurance device is provided in the pure water tank, wherein the water quality assurance device is used to slow down the deterioration of the water quality in the pure water tank; (6) When the water quality assurance device is in a new state, the conductivity of the water in the pure water tank is detected at different time points. The deterioration curve of the water quality over time is drawn with the resistivity corresponding to the conductivity as the ordinate and the time as the abscissa. The conductivity of the water quality is recorded by σ 标 Arrival 标 'Time, denoted as T; (7) Daily monitoring of water quality by σ 标 Arrival 标 ', denoted as T 样 , when T 样 Less than T 标 When the water quality assurance device is replaced, an alarm is sounded when the water quality assurance device is replaced, and n is greater than 2.

6. A method for monitoring the water quality of a laboratory pure water tank against deterioration according to claim 1, characterized in that: When the water stored in the pure water tank is purified, the method further comprises: a deionization column (DI column) is arranged on one side of the water tank, the deteriorated water generated in step (4) is discharged, filtered through the deionization column, and then connected to the pure water tank, and the water in the pure water tank is continuously purified, and its water conductivity σ 样 'Continue to decline to σ 样 ' is equal to σ 标 'Stop the circulation; the water circulation is driven by a recovery pump.

7. A method for monitoring the deterioration of water quality in a laboratory pure water tank according to claim 6, characterized in that: Record the amount of water passing through the deionized column, recorded as Q 样 , and set the water storage capacity of the water storage tank, recorded as Q 标 , calculate the number of cycles = Q 样 / Q 标 The lower the number of cycles, the better the purification effect of the deionization column. When the number of cycles is greater than the set number, the deionization column should be replaced.

8. A water storage device for preventing water quality degradation in a laboratory pure water tank, characterized in that: The water storage device uses the monitoring method for preventing water quality deterioration of a laboratory pure water tank as described in any one of claims 1 to 7 to monitor water quality; The water storage device comprises a pure water tank (1), wherein the bottom of the pure water tank (1) is provided with a water inlet (2), a water outlet (3) and an emptying port (4) which are in communication with the inner cavity of the pure water tank (1), wherein the water inlet (2) is connected to a water inlet pipe (6) of the water tank, the water outlet (3) is connected to a water outlet pipe (6) of the water tank, and the emptying port (4) can be optionally provided with a water tank emptying valve (7), wherein the water inlet pipe (6) of the water tank is connected to a water production pipe (9) of a pure water machine via a water inlet three-way valve (8), and the water outlet pipe (6) of the water tank is connected to a water outlet pipe (10) of an ultrapure water machine via a water outlet three-way valve (11). A water supply pipe (11), a third end of the water inlet three-way valve (8) is connected to a drainage pipe (12), a third end of the water outlet three-way valve (10) is connected to a recovery pipe (13), a water inlet conductivity sensor (14) is arranged in the water inlet three-way valve (8), and a water storage conductivity sensor (15) is arranged in the joint of the water outlet (3); the water inlet conductivity sensor (14) and the water storage conductivity sensor (15) are both electrically connected to a controller, and the water inlet three-way valve (8), the water outlet three-way valve (10) and the water tank drain valve (7) are all controlled by the controller.

9. A water storage device for preventing water quality degradation in a laboratory pure water tank according to claim 8, characterized in that: A deionizing column (16) is provided on one side of the pure water tank (1), the water inlet of the deionizing column (16) is connected to the recovery pipe (13), the water outlet of the deionizing column is connected to the drain port (4), and a recovery pump (17) for driving water circulation is provided on the recovery pipe (13).

10. A water storage device for preventing water quality degradation in a laboratory pure water tank according to claim 8, characterized in that: A water tap (18) is arranged on the side of the pure water tank (1); a tank cover (19) is arranged on the upper cover of the pure water tank (1); a water level sensor (20) and an air filter (21) extending downward to the inner cavity of the pure water tank (1) are installed on the tank cover (19); and the air filter (21) is filled with soda lime.

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