TWI742281B - Water sample dispenser and calibration method thereof - Google Patents

Abstract

A water sample dispenser in which a flow rate adjustment valve and a flow rate sensor are provided in series, wherein a first process of opening the flow rate adjustment valve until the volume detected by the flow rate sensor reaches a first volume and a second process of opening the flow rate adjustment valve until the volume detected by the flow rate sensor reaches a second volume are executed. Based on the first volume, the second volume, the actual amount of water sampled in the first process, and the actual amount of water sampled in the second process, two parameters are calculated that specify the linear equation that represents the relationship between the detection results of the flow rate sensor and the volume after correction. When sampling water in fixed quantities, the detection results of the flow rate sensor are corrected based on the two parameters.

Description

Water harvesting distributor and its correction method

The present invention relates to a water harvesting distributor, which is connected to a pure water production device and the like, and discharges pure water according to needs, and particularly relates to a water harvesting distributor when the water harvesting distributor has a quantitative water collection function The correction of water extraction.

In the case of using pure water in research institutes, etc., relatively small pure water production devices are often used to produce pure water. Furthermore, at the point of use, in order to collect pure water into, for example, beakers, bottles, test tubes, etc., a water collection dispenser connected to a pure water production device is widely used. The water collection distributor includes: a nozzle that discharges pure water; and an on-off valve, which is arranged in the path of the pure water to the nozzle, and supplies pure water to the nozzle, and then cuts off the supply. The water collection distributor is generally set at a position far away from the main system of the pure water production device, and is connected to the pure water outlet of the body of the pure water production device through a piping. By operating the on-off valve by the user, the pure water is discharged from the nozzle, whereby the user can collect the pure water in the required amount. As an on-off valve, a solenoid valve is often used. In the case of using a solenoid valve, a button switch that can be operated by a finger or a foot switch that can be operated by a foot is used to control the solenoid valve to discharge pure water from the nozzle. Furthermore, the water harvesting distributor often has a quantitative water harvesting function. The quantitative water harvesting function combines a flow sensor and a solenoid valve to open the solenoid valve to the flow rate measured by the flow sensor when there is a switch operation. The cumulative value of the value reaches the specified value, and by this, the pure water of the specified volume can be collected.

In the water sampling distributor with quantitative water sampling function, the solenoid valve is opened and closed according to the detection result of the flow sensor. However, due to the inherent detection error of the flow sensor, there is a difference between the discharge amount to be discharged and the actual discharge of liquid. The amount is different. Therefore, in order to discharge the liquid at the discharge amount specified by the user or preset in the water collection distributor, it is necessary to investigate the relationship between the measured value of the flow sensor and the actual flow rate in advance, and then calibrate the flow sensor based on this relationship. The measured value is used to control the solenoid valve.

Patent Document 1 discloses a method for calculating the correction coefficient of a flow meter that outputs a pulse wave corresponding to the flow rate passing through. The ratio of the flow rate of the flow to the flow rate corresponding to the number of pulses from the flowmeter, and this ratio is used as the correction coefficient K. Once the correction coefficient K is determined, the value obtained by multiplying the flow rate from the pulse wave value of the flowmeter by the correction coefficient K will be used as the measured value of the flow rate in the future. [Prior Technical Documents] [Patent Documents]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2-218923

[The problem to be solved by the invention]

In order to collect pure water with the required amount of water collected in a water sampling distributor with a quantitative water sampling function, it is necessary to calibrate the measurement value of the flow sensor installed in the water sampling distributor. When the method is used for calibration, it is impossible to collect water in the correct amount required by the quantitative water collection function of the water collection distributor.

The object of the present invention is to provide a water harvesting distributor and a calibration method thereof. The water harvesting distributor is a water harvesting distributor with a quantitative water harvesting function and capable of harvesting water with a high-precision volume. [Means to solve the problem]

The water collection distributor of the present invention is a water collection distributor used for water collection of pure water. It has: a piping, which is supplied with pure water from a pure water production device and communicates with a nozzle that discharges the pure water; The flow control valve is installed; the flow sensor is installed in series with the flow control valve in the piping; and the control unit that controls the flow control valve; the control unit performs the following actions. The first control is to open the flow control valve Until the volume obtained from the detection result of the flow sensor becomes the first volume; the second control is to open the flow adjustment valve until the volume obtained from the detection result of the flow sensor becomes the second volume which is different from the first volume. Volume; calculation processing, input is the first amount of the actual amount of water collected by the first control and the second amount of the actual amount of water collected by the second control, according to the first volume, second volume, The first quantity and the second quantity are calculated based on the two parameters that distinguish the "mathematical formula showing the relationship between the detection result of the flow sensor and the corrected volume"; and the control of the quantitative water collection mode, based on one side Two parameters are used to calibrate the detection result of the flow sensor. On the one hand, the flow adjustment valve is opened according to the calibration detection result until the volume flowing through the flow adjustment valve becomes the specified volume.

The method for calibrating the water collection distributor of the present invention is that the water collection distributor includes: a piping that is supplied with pure water from a pure water production device and communicates with a nozzle for discharging the pure water; a flow regulating valve provided in the piping; and a flow rate The sensor is installed in series with the flow control valve in the piping; and has a quantitative water collection function. This calibration method has the following processing. The first processing is to open the flow control valve to the detection from the flow sensor The resultant volume becomes the first volume; the second process is to open the flow adjustment valve until the volume obtained from the detection result of the flow sensor becomes a second volume different from the first volume; and the calculation process is based on The first volume, the second volume, the first volume of the amount of water actually collected by the first treatment, and the second volume of the amount of water actually collected by the second treatment, are calculated as Two parameters to identify the relationship between the detection result and the corrected volume. [Effects of Invention]

According to the present invention, two parameters that are identified by "a mathematical formula representing the relationship between the detection result of the flow sensor and the corrected volume" are calculated, and the two parameters obtained by this calculation are used for calibration. Therefore, it is possible to collect water with high accuracy compared with the so-called one-point correction based on the proportional equation.

Next, referring to the drawings, an embodiment of the present invention will be described. The water collection dispenser according to the present invention has a quantitative water collection function, and is used, for example, for combining with a pure water production device and collecting pure water. Fig. 1 is a flowchart showing a state in which a water collection dispenser and a pure water production device according to an embodiment of the present invention are combined.

The pure water production device 50 includes a pure water production unit 51 that is supplied with tap water to produce pure water; and a main control device 52 that controls the operation of the pure water production unit 51. The pure water production unit 51 is composed of a primary pure water production device and a subsidiary system. The primary pure water production device is equipped with, for example, a reverse osmosis membrane or an ion exchange device, and produces primary pure water from the supply water. The subsidiary system has an ion exchange system. The circulatory purification system constituted by the device or ultrafiltration membrane, ultraviolet oxidation device, etc., to further improve the purity of the primary pure water. Various sensors (not shown), pumps (not shown), valves (not shown), etc. are also installed in the pure water production section 51, and the main control device 52 receives signals from the sensors. Based on these signals, a pump (not shown) or a valve (not shown) is controlled, thereby controlling the operation of the pure water producing unit 51. To the outlet of the pure water production unit 51, a plurality of outlet ports 53 for supplying pure water to the collected water distributor 10 are connected. The outlet port 53 is a port at the connection position of the pure water production device 50 and the collected water distributor 10, and the collected water distributor 10 is connected to any one of the outlet ports 53 by, for example, a flexible pipe 55. In the example shown in the figure, three outlet ports 53 are provided, and the water collection distributor 10 is connected to each, whereby a total of three water collection distributors 10 and the pure water production device 50 are connected. Of course, the number of outlet ports 53 is not limited to three, and the number of water collection distributors 10 connected to the pure water production device 50 may be arbitrarily increased or decreased within the range of the number of outlet ports 53.

Next, the water collection distributor 10 will be described. FIG. 2 shows the appearance of the water collection dispenser 10. However, in FIG. 2, the piping 55 or various wiring systems used for connection with the pure water production apparatus are not shown. The water sampling distributor 10 is roughly composed of a head 10a, a main body 10b, and a pillar 10c. The pillar 10c extends vertically upward from the main body 10b and detachably holds the head 10a. The head 10a and the main body 10b are connected to each other. It is connected by a flexible pipe 14. As a usage form of the water collection dispenser 10, for example, there is a user who continuously injects pure water into a plurality of test tubes arranged in a row on a laboratory bench. In order to cope with this purpose, a head 10a that is held by the user and movable to a desired position is provided, and a nozzle 16 that actually becomes a pure water injection port is provided on the head 10a. On the head 10a, a handle 25 or handle required for the user to hold is provided. In addition, since it is also necessary to collect pure water into a measuring bottle or measuring cylinder with a small volume to a large volume while still holding the head 10a on the pillar 10c, it is necessary to change the holding position of the head 10a of the pillar 10c and the pillar 10c The 10c series has a sufficient length.

The head 10a discharges the pure water supplied from the main body 10b via the pipe 14 from the nozzle 16. As shown in FIG. 1, in addition to the nozzle 16, it also includes a flow path 15 connected to the pipe 14. The end of road 15. Furthermore, the head 10a is provided with a switch 18 operated by the user in order to discharge pure water in response to the needs of the user. On the head 10a, as shown in FIG. 2, a button 26 is provided at a position where the user holding the handle 25 can easily operate it with his fingers. The button 26 is mechanically connected to the switch 18 (refer to FIG. 1 ), and the switch 18 is operated by operating the button 26.

The main body 10b is provided with a piping 11, one end of the piping 11 is connected to the piping 55 from the pure water production device 50, and the other end is connected to the piping 14 to the head 10a. In the piping 11, a flow sensor 12 and a flow control valve 13 are provided in this order from the upstream side, that is, the side close to the pure water production device 50. Furthermore, the main body part 10b is provided with the control part 20 which controls the operation|movement of the water collection dispenser 10, and the operation panel 19 connected to the control part 20. As shown in FIG. The flow rate adjustment valve 13 is, for example, an electromagnetic type, and can control the opening and closing of the valve based on a signal from the control unit 20, and can change the flow rate of pure water passing through the valve. The flow sensor 12 is, for example, a pulse wave type that outputs an electric pulse wave whenever a liquid of a fixed volume (volume) flows. The operation panel 19 receives settings from the user, for example, the amount of water collected or the water collection mode, and provides necessary display to the user. As the water harvesting mode, there are an arbitrary amount of water harvesting mode and a quantitative water harvesting mode. The arbitrary amount of water harvesting mode is made to allow any amount of water to be harvested. The quantitative water harvesting mode is a water harvesting mode based on the quantitative water harvesting function. The volume of pure water designated by the user is discharged from the nozzle 16, and further, other water collection modes can also be set.

The control unit 20 controls the entire water harvesting distributor 10, for example, accepts a request for water harvesting from the user input via the switch 18 of the head 10a, and performs creation borrowing when the water harvesting mode is a quantitative water harvesting mode. The flow control valve 13 is opened to the cumulative value of the flow rate detected by the flow sensor 12, that is, the volume value becomes the set value, and the head 10a is supplied with pure water in the amount indicated by the set value. The details of water harvesting in the quantitative water harvesting mode will be described later. When the water collection mode is the arbitrary amount water collection mode, the control unit 20 performs control to open the flow adjustment valve 13 only while the switch 18 is operated. In addition, in the case of the arbitrary water collection mode, the user can specify the flow rate of pure water from the nozzle via the operation panel 19, that is, the discharge amount per unit time, and the control unit 20 controls the flow rate so as to be the specified flow rate. Adjust valve 13. This is because there are cases where the speed of water collection in the washing bottle is emphasized, and the accuracy of the water collection operation is emphasized in the water collection from the measuring bottle to the mark. Furthermore, the control unit 20 is connected to the main control device 52 of the pure water production device 50 through the wiring shown by the broken line in the figure, and obtains information about the operating state of the pure water production device 50 from the main control device 52, especially the manufactured one Water quality data such as total organic carbon (TOC: total organic carbon) value, electrical resistivity, and temperature value of pure water. The control unit 20 displays the acquired water quality data on the operation panel 19 in a predetermined format.

Among these elements constituting the main body portion 10b of the collected water distributor 10, the piping 11, the flow sensor 12, the flow rate adjustment valve 13, and the control unit 20 are installed inside the frame 21 shown in FIG. 2. The operation panel 19 has a flat shape, and is attached to the housing 21 via a hinge 23 at one end thereof. On one surface of the operation panel 19, a touch panel 22 that integrates a liquid crystal display panel and a touch sensor is provided. The touch panel 22 functions as a display portion displayed to the user, and the user touches a predetermined position on the touch panel 22 to accept input from the user.

Next, the details of the quantitative water collection mode of the water collection distributor 10 of this embodiment will be described. In the quantitative water collection mode, when the user sets the desired water collection volume to the set value L, the control unit 20 performs the following control, opens the flow adjustment valve 13, and counts the pulse wave from the flow sensor 12, and calculates The volume of the liquid passing through, and the flow adjustment valve 13 is closed at the point in time when the passing volume reaches the set value L. Therefore, the accuracy of the volume of pure water discharged from the nozzle 16 depends on the accuracy of the flow sensor 12. In the water collection distributor 10 of this embodiment, before performing water collection according to the quantitative water collection mode, for example, when the water collection distributor 10 is installed, etc., the correction parameters for the count value of the pulse wave from the flow sensor 12 are obtained. . In this embodiment, the volume represented by the count value of the pulse wave from the flow sensor 12 is regarded as X, and the volume of liquid actually flowing through the flow sensor 12 is regarded as Q, and the mathematical formula (1) The two correction parameters a and b are obtained in such a way that the relationship of the first-order mathematical formula shown is established.

[Math 1] Q=a･X+b　　 (1) In this embodiment, the water sampling distributor 10 is operated to discharge pure water according to two different volume values, and the actual discharge in each case is measured The volume of pure water, and then based on these measurement results, obtain two calibration parameters a, b.

Fig. 3 shows a specific procedure for obtaining the correction parameters a and b. First, at step 101 as the volume set value A ₁ L, 10 at step 102 according to this operation setting value L so collected water dispenser, water is discharged. In step 103, the discharged pure water is collected in, for example, a graduated cylinder, and its volume is measured. Take the actually measured volume as B ₁ . Next, in the same manner, at step 104, the system different from the volume of the volume of A ₁ A ₂ L as the setting value, so that the operation of collecting water dispenser 10 according to the value L at step 105, water is discharged, then at step 106 the measurement The volume of the discharged pure water B ₂ . As shown above, after measuring the actually discharged pure water volumes B ₁ and B _{2 corresponding to the set volumes A 1} and A ₂ respectively, in step 107, according to the mathematical formulas (2) and (3), Determine the correction parameters a and b.

[Math 2] a=(B ₁ -B ₂ )/(A ₁ -A ₂ ) (2) [Math 3] b=B ₁ -a･A ₁ (3) The user inputs the decision via the operation panel 19 When the parameter is adjusted, the control unit 20 executes the processing of steps 101, 102, 104, 105, and 107 in the processing shown in FIG. 3, and displays on the operation panel 19 to urge the user to execute the processing of steps 103 and 106 And accept input from the user about the measured volume B ₁ and B _2. The set volumes A ₁ and A ₂ may be different from each other as long as they are both non-zero, but the volume of one is set to a value that is larger than or slightly larger than the amount of water commonly used in the water harvesting distributor 10, and the other It is better to set the volume of one side to a relatively small value. For example, assuming that A ₁ > A ₂ , and if the commonly used water harvesting volume or the commonly used maximum water harvesting volume in the quantitative water harvesting mode of the water harvesting distributor 10 is taken as V, then A ₁ =V, or that is about to be commonly used The amount is regarded as A ₁ , or it is better to set A ₁ =about 1.1×V. On the other hand, A ₂ is preferably set to A ₂ =about 0.1×V. However, when the flow sensor 12 is of the pulse wave type, and the quantization error caused by the pulse wave type in the volume of about 0.1×V cannot be ignored, in order to obtain a sufficient pulse wave number, the A ₂ system is set to A value larger than 0.1×V is preferable. The values of the volumes A ₁ and A ₂ are programmed in the control unit 20 in advance, and may also be input in advance by the user. If the amount of water collected frequently used in the water collection dispenser 10 is 1000 mL, the A ₁ system is set to, for example, 1100 mL, and the A ₂ system is set to, for example, 100 mL.

Next, the water collection operation in steps 102 and 105 will be explained. The treatments in steps 102 and 105 are all pure water discharged from the nozzle 16 in a volume indicated by the set value L, and are basically the same treatments as water collection in the quantitative water collection mode. FIG. 4 is a flowchart showing the process of discharging pure water of the volume indicated by the set value L. As the set value L has been set.

First, in step 111, the volume measurement value P is cleared even if it becomes zero. The volume measurement value P is the value of the volume obtained by counting or accumulating the pulse wave from the flow sensor 12, where it is the value before the correction according to the correction parameters a and b. Next, in step 112, the flow rate adjusting valve 13 is fully opened. As a result, the pure water is discharged from the nozzle 16, and the flow sensor 12 continuously generates a pulse wave for flow measurement. The control unit 20 continues to count the pulse wave from the flow sensor 12, and as shown in step 113, compares the volume measurement value P calculated by subtracting the parameter Δ from the set value L and the pulse wave count at any time. Furthermore, step 113 is repeated until P≧L-Δ, that is, the volume measurement value P reaches the value that subtracts the parameter Δ from the set value L. When the volume measurement value P reaches a value minus the parameter Δ from the set value L, in step 114, the control unit 20 reduces the opening angle of the flow adjustment valve 13 to reduce the flow rate of pure water flowing through the flow adjustment valve 13. This is because when the volume measurement value P becomes the set value L, when the flow rate adjusting valve 13 is controlled from fully open to fully closed, the correct amount cannot be discharged due to an overshoot phenomenon or the like. L-△ becomes the threshold value used to determine the timing of reducing the opening angle of the flow regulating valve 13. The value of △ is a positive value determined according to the size or configuration of the piping 11 or the flow sensor 12 and the flow adjustment valve 13. For example, it can be set to a value of approximately% of the set value L, or if the flow sensor 12 is The pulse wave type can be set to be equivalent to tens to hundreds of pulse waves. For example, when the set value L is 1000 mL, △ can be set to 70 mL.

Then, the control unit 20 determines in step 115 whether the volume measurement value P reaches the set value L, and overlaps steps 115 to P≧L, that is, the volume measurement value P reaches the set value L. After the volume measurement value P reaches the set value L, the control unit 20 immediately closes the flow adjustment valve 13 completely in step 116. In this embodiment, because the opening angle of the flow control valve 13 is reduced in advance, it is possible to completely stop the flow of pure water from the nozzle 16 at the point in time when the volume measurement value P reaches the set value L without overshooting.的出。 The discharge.

Next, the quantitative water harvesting after deciding the correction parameters a and b will be explained. The treatment of quantitative water harvesting is carried out in the same way as above in accordance with the procedure shown in Fig. 4. However, when the set value L is set to the volume of water to be collected, the value used as the volume measurement value P is the corrected volume Q calculated at any time according to the above-mentioned mathematical formula (1). In this embodiment, after measuring the actual volume B ₁ and B ₂ for each of the set volume values A ₁ and A ₂ , the correction parameters a and b are determined, and then the flow sensor is corrected according to the correction parameters a and b. As compared with the case of the so-called one-point calibration described in Patent Document 1, for example, the measurement value of the sensor 12 can improve the accuracy of the flow rate or the volume. Furthermore, using the parameter △, the flow rate is increased to the maximum limit when the pure water is discharged, and the flow rate is reduced just before the timing of stopping the discharge, so that the correct discharge time can be discharged without wasting a long discharge time. quantity. In addition, here is an explanation of the processing for quantitative water harvesting, but it is also possible to calculate the corrected volume Q at any time according to the correction parameters a and b in the arbitrary water harvesting mode. If the calculated Q value is displayed on the operation panel 19, The user's convenience becomes higher.

In this embodiment, three water collection distributors 10 are connected to the pure water production device 50. Because the error of the collected water distributor 10 is different for each collected water distributor 10, the correction parameters a and b are determined for each collected water distributor 10, and the determined correction parameters a and b are stored in each collected water distributor 10 Control unit 20. However, in order to reduce the man-hours for determining the calibration parameters a and b, it can also be made that by inputting a command to determine the calibration parameters in any water collection distributor 10, each water collection distributor 10 shifts to a mode for determining the calibration parameters. In this case, the command is transmitted from the collected water dispenser 10 to which the command is input to the other collected water dispenser 10 via the main control device 52 of the pure water production device 50.

10‧‧‧Water collection distributor 10a‧‧‧Head 10b‧‧‧Main body 10c‧‧Support 11‧‧‧Piping 12‧‧‧Flow sensor 13‧‧‧Flow adjusting valve 14‧‧‧Piping 15 Flow path 16 26‧‧‧Button 50‧‧‧Pure water production device 51‧‧‧Pure water production department 52‧‧‧Main control device 53‧‧‧Exit port 55‧‧‧Piping 101~107, 111~116‧‧‧ step

[Figure 1] is a flowchart showing the structure of a pure water production device and a water collection distributor. Fig. 2 is a perspective view showing an example of the external appearance of a water sampling dispenser of an embodiment. [Figure 3] is a flow chart showing the procedure for determining the calibration parameters of the flow sensor. [Figure 4] is a flow chart showing the operation in the quantitative water collection mode.

10a‧‧‧Head

10b‧‧‧Main body

10c‧‧‧Pillars

14‧‧‧Piping

16‧‧‧Nozzle

19‧‧‧Operation Panel

21‧‧‧Frame

22‧‧‧Touch Panel

23‧‧‧Hinge

25‧‧‧Handle

26‧‧‧Button

Claims (8)

A water harvesting distributor used for water harvesting of pure water. It has: a piping, which is supplied with pure water from a pure water production device and communicates with a nozzle that discharges the pure water; a flow regulating valve is arranged in the piping; and a flow sensing And the control part is used to control the flow control valve; the control part performs the following actions, the first control is to open the flow control valve to the flow sensing The volume obtained from the detection result of the flow sensor becomes the first volume; the second control opens the flow adjustment valve until the volume obtained from the detection result of the flow sensor becomes a second volume different from the first volume; After inputting the amount of water actually collected by the first control, that is, the first amount, and the amount of water actually collected by the second control, that is, the second amount, it is based on the first volume and the second amount. 2 The volume, the first quantity, and the second quantity are calculated to identify the two parameters of the "mathematical formula showing the relationship between the detection result of the flow sensor and the corrected volume"; and the quantitative water collection mode The control is to calibrate the detection result of the flow sensor based on the two parameters, and open the flow adjustment valve to the specified volume based on the corrected detection result. For example, the water sampling distributor of the first item of the scope of patent application, wherein the control unit controls the flow rate flowing through the flow rate adjustment valve to the first flow rate when the flow rate adjustment valve is controlled from the closed state to the open state. When the volume obtained by the detection result of the flow sensor becomes a predetermined value, when the control to close the flow sensor is performed, the flow through the flow adjustment valve is reduced when the volume reaches a threshold value smaller than the predetermined value To a flow rate smaller than the first flow rate, and when the volume reaches the predetermined value, control to completely close the flow rate adjustment valve is performed. For example, the water harvesting dispenser of item 1 or 2 of the scope of patent application, wherein the first amount is set according to the amount of water that is often used in the water harvesting dispenser. A method for calibrating a water collection distributor, the water collection distributor comprising: a piping, which is supplied with pure water from a pure water production device and communicated with a nozzle for discharging the pure water; a flow regulating valve provided in the piping; and flow sensing The water sampling distributor is arranged in series with the flow adjustment valve in the piping; the water sampling distributor also has a quantitative water sampling function. The calibration method of the water sampling distributor includes the following treatments. The first treatment is to open the flow adjustment valve to The volume obtained from the detection result of the flow sensor becomes the first volume; in the second process, the flow adjustment valve is opened until the volume obtained from the detection result of the flow sensor becomes the first volume different from the first volume. 2 volume; and calculation processing, based on the first volume, the second volume, the amount of water actually collected by the first treatment, that is, the first amount, and the amount of water actually collected by the second treatment That is, the second quantity is to calculate two parameters that distinguish the "mathematical expression of the relationship between the detection result of the flow sensor and the corrected volume". For example, the calibration method of the water sampling distributor in the scope of patent application includes the following processing: on the one hand, the detection result of the flow sensor is calibrated according to the two parameters, and the flow rate is adjusted according to the detection result after calibration. The valve is opened until the volume flowing through the flow adjustment valve becomes the specified volume. For example, the calibration method of the water sampling dispenser in item 4 or 5 of the scope of patent application, which When the flow control valve is controlled from the closed state to the open state, the flow rate flowing through the flow control valve is set to the first flow rate; when the volume obtained from the detection result of the flow sensor becomes a predetermined value, the flow rate control valve is closed. In the case of a flow sensor, when the volume reaches a threshold value smaller than the predetermined value, the flow rate flowing through the flow adjustment valve is reduced to a flow rate smaller than the first flow rate, and when the volume reaches the predetermined value Completely close the flow adjustment valve. For example, in the calibration method of the water collection dispenser in item 4 or 5 of the scope of patent application, the first amount is set according to the water collection volume frequently used in the water collection dispenser. For example, the calibration method of the water sampling distributor in the scope of the patent application, wherein the first amount is set according to the water collected frequently used in the water sampling distributor.

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