JP3228773U - Water quality analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a solution more accurately without being affected by a phenomenon of dripping on a wall and a phenomenon of tilting of a liquid surface, while being able to measure a very small amount of liquid and having a very low concentration. A water quality analyzer suitable for preparing a solution is provided. SOLUTION: A water quality analyzer communicates with a container 2, an electronic balance 1 on which the container is placed and weighed, and a liquid feeding device 3 for transporting a plurality of types of liquids to the container and preparing a solution in the container. 4 and. The water quality analyzer includes a first working mode for preparing a standard sample solution, a second working mode for diluting the standard sample solution to prepare a non-standard sample solution, and a third working mode for preparing a measurement reagent. During operation, the weight of the solution before and after it is transported to the container can be weighed by an electronic balance and converted into the weight, volume and specific gravity of the sample solution. Since the electronic balance has high sensitivity and low detection limit, the measurement error is reduced and the solution quantification system is improved. [Selection diagram] Fig. 1

Description

This utility model relates to the field of water quality detection, and more specifically to a water quality analyzer.

An online water quality analyzer is a water quality regulator that can monitor or measure one or more parameters of a body of water. During monitoring or measurement, it is often necessary to use in combination with several solutions, such as standard sample solutions and measurement reagents, which are consumables and are usually in short supply. Need to be replenished in some cases. Some conventional water quality analyzers are also equipped with a solution automation preparation module to avoid frequent replenishment of such solutions and to increase the degree of automation of the device.

Conventional solution automation preparation modules are mainly divided into two types.
One employs an extraction device that sets the height of the extraction port, i.e. the extraction port of the extraction tube is provided at a specific height in the container containing the liquid component of the solution to be prepared. The extraction tube is connected to a vacuum pump, the liquid in the container is extracted by the vacuum pump, and the cross-sectional area of the container is multiplied by the lowering height of the liquid level during the extraction process to obtain the volume of the extracted liquid. A solution can be prepared by mixing different volumes of liquid. However, on the other hand, in such a device, the phenomenon that the solution drips down to the wall is likely to occur, and the tilt of the liquid level due to the tilted arrangement or shaking of the device also affects the volume of the extracted liquid. The accuracy is low.

The other also prepares a solution by mixing different liquids, each of which has a specific volume, and specifically measures the liquid using a fixed volume syringe, the device being a motor. Or it is difficult to improve the accuracy of work by using a cylinder device.
It should be noted that the above-mentioned conventional devices have a problem that the error of volume measurement is relatively large, and none of them can measure a very small amount of liquid (for example, mother liquor), so that it is difficult to prepare a solution having a low concentration. Is.

In view of the above-mentioned problems of the prior art, the present practical novel can prepare a solution more accurately without being affected by the phenomenon of dripping on the wall and the phenomenon of tilting of the liquid level, while producing a very small amount of liquid. A water quality analyzer that can be measured and is suitable for the preparation of very low concentration solutions is provided.

Specifically, the water quality analyzer according to the technical proposal 1 of the present practical new proposal is a container and a liquid feeding device for communicating with the container, transporting a plurality of types of liquids to the container, and preparing the solution in the container. , A container is placed, and an electronic balance for measuring the container and the liquid in the container, and an information output module installed on the electronic balance and outputting the information measured by the electronic balance are provided.
According to the above technical proposal 1, the weight of the liquid before and after it is transported to the container is measured by the electronic balance, and the weight of the container can be increased even if the liquid drips on the wall. Since the change in weight is reflected in the measurement result output by the information output module, the measurement result is not affected even if it drips on the wall. The measurement of the electronic balance has higher accuracy than the conventional volume measurement method, and the solution can be prepared more accurately. Furthermore, the electronic balance has a high sensitivity (or a low detection limit) and can measure a very small amount of liquid relatively accurately, so that it has an effect suitable for preparing a solution having a very low concentration.

In the water quality analyzer according to the technical proposal 2 of the utility model, the liquid feeding device is communicated and connected to the electronic balance through the information output module.
According to the above technical proposal, the liquid feeding device is communication-connected to the electronic balance, and the liquid feeding amount of the liquid feeding device can be controlled based on the measurement data output from the information output module of the electronic balance.

The water quality analyzer according to the technical proposal 3 of the utility model further has a control system for communication connection with the electronic balance and the liquid feeding device, respectively.
According to the above technical proposal, the control system can feedback-control the liquid feed amount of the liquid feed device based on the measurement result output from the information output module of the electronic balance, and improve the accuracy of the concentration of the prepared solution. On the other hand, different concentrations of solutions can be automatically prepared by setting the control system.

In the water quality analyzer according to the technical proposal 4 of the practical novel, the container has a first inlet and a second inlet, and the liquid feeder is a first liquid feeder that communicates with the first inlet of the container. It has a second liquid feeding device that communicates with the second inlet of the container.
According to the above technical proposal, the accuracy of solution preparation is improved because the two liquids are not mixed before being transported to the container through the liquid feeder.

The water quality analyzer according to the technical proposal 5 of the utility model has a solvent storage unit that communicates with the inlet of the first liquid feeding device and a mother liquor storage unit that communicates with the inlet of the second liquid feeding device.
According to the above technical proposal, by controlling the connection circuit of the liquid feeding device, the mother liquor can be diluted with a solvent in the container, and the mother liquor can be prepared into a standard sample solution more accurately.

The water quality analyzer according to the technical proposal 6 of the utility model has a standard sample solution storage unit that communicates with the inlet of the second liquid feeding device.
According to the above technical proposal, the standard sample solution can be diluted with a solvent in the container by controlling the connection circuit of the liquid feeding device. According to the above form, standard sample solutions having different concentrations can be obtained so as to match the measurement of the sample, and the accuracy of the measurement can be improved.

The water quality analyzer according to the technical proposal 7 of the utility model has a first reagent storage unit communicating with the inlet of the first liquid feeding device and a second reagent storage unit communicating with the inlet of the second liquid feeding device. ..
According to the above technical proposal, the water quality analyzer can automatically prepare the measurement reagent by controlling the connection circuit of the liquid feeding device.

By operating the water quality analyzer in various working modes and providing the ability to prepare different types of solutions, the water quality analyzer automatically and more accurately completes measurement tests of more types of parameters. be able to.

In the water quality analyzer according to the technical proposal 8 of the utility model, the solvent storage unit or the first reagent storage unit is installed on the inlet side of the first liquid feeding device, and the first is for switching the continuity with the first liquid feeding device. Equipped with a switching valve.
According to the above technical proposal, in the request for preparing the actual solution, the storage unit connected to the first liquid feeding device can be changed by switching the valve, thereby improving the convenience of the actual production. ..

In the water quality analyzer according to the technical proposal 9 of the present practical novel, the mother liquor storage unit, the standard sample solution storage unit, or the second reagent storage unit is installed on the inlet side of the second liquid supply device, and the water quality analyzer A second switching valve for switching the continuity is provided.
According to the above technical proposal, in the request for preparing an actual solution, the storage unit connected to the second liquid feeding device by the valve can be switched, and thus the convenience of the actual production is improved.

In the water quality analyzer according to the technical proposal 10 of the utility model, the first liquid feeding device is a peristaltic pump and the second liquid feeding device is an electric syringe.
According to the above technical proposal, the combined use of a peristaltic pump and an electric syringe is advantageous in selecting an appropriate liquid delivery device according to the needs of various doses, in which a large amount of peristaltic pump is used. Used to control the infusion of liquid, electric syringes are used to control the infusion of small amounts of liquid.

It is a schematic diagram of the water quality analyzer of this embodiment. It is a schematic diagram of the first working mode of the water quality analyzer of this embodiment. It is a schematic diagram of the second working mode of the water quality analyzer of this embodiment. It is a schematic diagram of the third working mode of the water quality analyzer of this embodiment.

Hereinafter, embodiments according to the utility model will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of the online water quality analyzer of the present embodiment. As shown in FIG. 1, in the water quality analyzer of the present embodiment, the container 2 is attached to the electronic balance 1 and mounted by the electronic balance 1, and the electronic balance 1 is the container 2 (including the liquid contained therein). The electronic balance 1 has an information output module 11, and the information output module 11 of the electronic balance 1 is communication-connected to the control system 5 of the entire device.

The container 2 is provided with a first injection port 31 and a second injection port 41. The water quality analyzer of the present embodiment further includes a first liquid feeding device 3 and a second liquid feeding device 4, and the first liquid feeding device 3 passes through the first injection port 31 on the downstream side of the liquid flow path. Communicating with the container 2, the second liquid feeding device 4 communicates with the container 2 through the second injection port 41 on the upstream side of the liquid flow path. The first inlet 31 and the second inlet 41 may be abutted or connected to the container 2 or may be suspended above the bottom of the container 2. The installation height of the first injection port 31 and the second injection port 41 from the bottom of the container 2 can be adjusted according to actual needs, and can be installed at a position relatively close to the bottom, for example. As a result, it is possible to prevent the liquid 9 from giving a large impact to the bottom of the container 2 while flowing or dropping, and the reading of the electronic balance 1 becomes unstable. In some embodiments, reading the final value after the reading is stable avoids the problem of inaccurate reading due to the impact of liquid flow.

The water quality analyzer of the present embodiment further comprises a plurality of storage units 10 in which different types of liquids such as mother liquor 92 (or undiluted solution) of standard sample solution 93, solvent 91, standard sample solution 93, and reagents are stored. Have. A first switching valve (not shown) for switching the storage unit 10 communicating with the first liquid feeding device 3 is provided on the inlet side of the first liquid feeding device 3, and the second liquid feeding device 3 is provided. A second switching valve (not shown) for switching the storage unit 10 communicating with the second liquid feeding device 4 is provided on the inlet side of the fourth. When preparing the solution, the first liquid feeding device 3 and the second liquid feeding device 4 respond by switching the first switching valve and the storage unit 10 communicated with the second switching valve as needed. The corresponding liquid can be extracted from the storage unit 10 to prepare the solution.

Specifically, the first switching valve and the second switching valve may be a multi-port valve (for example, an eight-port valve), and each liquid flow of the first liquid feeding device 3 and the second liquid feeding device 4. It is arranged correspondingly to the entrance side of the road.

In the present embodiment, when preparing the solution, the communication circuit on the upstream side of the first liquid feeding device 3 and the second liquid feeding device 4 is adjusted by switching the first switching valve and the second switching valve. Can be done. In some embodiments, the first liquid feeding device 3 and the second liquid feeding device 4 can communicate with the same storage unit 10 and adopt different structures and types (first liquid feeding device 3 and second liquid feeding device 3 and second). The liquid feeding device 4) can balance the speed and accuracy of liquid injection by taking on the functions of controlling the rapid injection of a large amount of liquid and the accurate injection of a small amount of liquid, respectively.

The water quality analyzer of the present embodiment further includes a control system 5 that communicates and connects to the electronic balance 1, the first liquid feeding device 3, and the second liquid feeding device 4, respectively, and the control system 5 is located between the electronic balance 1 and the electronic balance 1. By communication, the weighing data output from the information output module 11 of the electronic balance 1 can be acquired, and the operations of the first liquid feeding device 3 and the second liquid feeding device 4 are controlled according to the weighing data. As a result, the liquid flowing through the first liquid feeding device 3 and the second liquid feeding device 4 controls the flow and shutoff to the container 2.

The solution automation preparation module of the water quality analyzer of this embodiment can prepare different kinds of solutions by communicating with different storage units 10. Specifically, depending on the measurement requirements of the analyzer, the solution automated preparation module provided from this embodiment may respond to different preparation requirements such that the different preparation requirements may be met by correspondingly adjusting the preparation methods and parameters. Different work modes can be set in advance. Specifically, the solution automation preparation module in the present embodiment has a first working mode for preparing the standard sample solution 93, a first working mode for diluting the standard sample solution 93 to obtain a standard sample solution 93 having a different concentration. Includes two working modes and a third working mode for preparing measurement reagents. The illustrations and uses of the above working modes are exemplary, and in some other embodiments, the solution automated preparation module may include one or two working modes thereof, or other working modes. It may include a mode. In some embodiments, for example, in the third working mode of the present embodiment, the same liquid feeding device can communicate with the storage unit 10 of a plurality of reagents at the same time (for example, the electric syringe 42 is the reagent B). It is also possible to communicate with the second reagent storage unit 7-1 of the above and the third reagent storage unit 8-1 of the reagent C at the same time, or to communicate with different storage units 10 at different time zones (for example, electric motor). The syringe 42 is communicated with the second reagent storage unit 7-1 of the reagent B during the first liquid extraction operation, and is communicated with the third reagent storage unit 8-1 of the reagent C during the second liquid extraction operation. ).

Further, the container 2 in the water quality analyzer in the present embodiment can provide a platform for preparing the measurement reagent, but does not limit a specific acquisition method for preparing the measurement reagent, for example. In some embodiments, the preparation of the measurement reagent can be obtained by diluting the mother liquor 92 of the measurement reagent, by mixing different measurement reagents, diluted water, standard reagents, etc., or even reacting. Can be obtained.
FIG. 2 is a schematic diagram of the first working mode of the water quality analyzer of the present embodiment, FIG. 3 is a schematic diagram of the second working mode of the water quality analyzer of the present embodiment, and FIG. 4 is a schematic diagram of the water quality analyzer of the present embodiment. It is a schematic diagram of the third work mode of.

As shown in FIGS. 2 to 4, in each work mode of the water quality analyzer of the present embodiment, the first liquid feeding device 3 employs a peristaltic pump 32, and the second liquid feeding device 4 employs an electric syringe 42. .. The control system 5 includes a detector 51 and a PC system 52, and the detector 51 can detect a measured value output from the information output module 11 of the electronic balance 1 and feed back the measured value to the PC system 52. The PC system 52 needs to continue adding the liquid 9 (for example, mother liquor 92 or solvent 91) through the internal program according to the conversion relationship of parameters such as density, volume, mass, and concentration according to the feedback value of the detector 51. The control module in the PC system can control the opening and closing of the peristaltic pump 32 and the electric syringe 42 by calculating the presence or absence and then comparing the calculation result with the feedback value.

As shown in FIG. 2, in the first working mode of the water quality analyzer of the present embodiment, the mother liquor 92 of the standard sample solution 93 to be prepared is stored in the mother liquor storage unit 7, and the solvent is stored in the solvent storage unit 6. 91 (eg, diluted water) is stored. During the preparation of the standard sample solution 93, the PC system 52 first controls the second switching valve to communicate the electric syringe 42 with the mother liquor storage unit 7 to operate the electric syringe 42, and the electric syringe 42 extracts the mother liquor 92. To do. Next, the mother liquor 92 flows through the electric syringe 42 and the second injection port 41 in order and enters the container 2, and when the mother liquor 92 enters, the numerical value of the electronic balance 1 for measuring the weight of the container 2 changes and is detected. The vessel 51 acquires the numerical value m ₀ of the electronic balance 1 in real time, and feeds back the numerical value m ₀ to the PC system 52. The PC system 52 compares the numerical value m ₀ with a predetermined threshold m ₁ (target concentration of the prepared standard sample solution 93, the required mass of mother liquor 92 determined by the target volume) by comparing. Controls the operation of the electric syringe 42. For example, if m ₀ <m ₁ , the electric syringe 42 continues to send the mother liquor 92, and if m ₀ reaches m ₁ , the operation of the electric syringe 42 is stopped, and m ₀ > m ₁ . If so, the target weight or target volume of the required solvent 91 will be calculated again.

Next, after weighing a predetermined weight of the mother liquor 92, the PC system 52 stops the operation of the electric syringe 42, controls the first switching valve, communicates the perturbation pump 32 with the solvent storage unit 6, and then perturbates. The pump 32 is operated, and the solvent 91 (diluted water) having a predetermined volume or weight is put into the container 2. The predetermined volume or weight may be the volume or weight of the required solvent 91 determined by the target concentration, target volume, etc. of the standard sample solution 93 prepared by the PC system 52, or recalculated from m _0. It may be the target weight and the target volume of the required solvent 91 thus obtained, or it may be the weight or volume value determined by any other suitable calculation method. When the target is placed in the solvent 91 having a predetermined weight, the feedback control method can be executed with reference to the method of adding the mother liquor 92.

In the first working mode of the water quality analyzer of the present embodiment, the control system 5 including the detector 51 and the PC system 52 acquires the measurement data result of the electronic balance 1, and the perturbation pump 32 and the electric syringe 42 are obtained from the data result. The mother liquor 92 is prepared into the standard sample solution 93 in the container 2 by controlling the operation of. Since the measurement of the electronic balance 1 has high sensitivity and accuracy and a low detection lower limit, it is possible to avoid the measurement error caused by measuring the volume of the mother liquor 92 using a fixed volume device and improve the accuracy of preparing the standard sample solution 93. While improving, even a very low concentration of standard sample solution 93 can be prepared automatically. After the preparation of the standard sample solution 93 is completed in the container 2, the prepared standard sample solution 93 is discharged from the discharge port 20 and then used, or transported to a corresponding storage unit for storage.

As shown in FIG. 3, in the second working mode of the water quality analyzer of the present embodiment, the solvent 91 is stored in the solvent storage unit 6 communicated with the perturbation pump 32, and the PC system 52 has a second switching valve. The electric syringe 42 is communicated with the standard sample solution storage unit 8, and the standard sample solution 93 is stored in the standard sample solution storage unit 8. Similar to the first working mode, the container 2 can be a platform for diluting the standard sample solution 93, by adding solvent 91 (eg, diluted water) to the extracted standard sample solution 93. The standard sample solution 93 is diluted to a specific multiple, and the diluted standard sample solution 93 is discharged from the discharge port 20 before use, or is transported to a corresponding storage unit for storage.

As shown in FIG. 4, in the third working mode of the water quality analyzer of the present embodiment, the PC system 52 controls the first switching valve, and the peristaltic pump 32 is the first reagent storage unit 6- where the reagent A is stored. In addition to communicating with 1, the second switching valve is controlled to communicate the electric syringe 42 with the second reagent storage unit 7-1 in which the reagent B is stored, and further, the second switching valve is controlled to control the electric syringe 42 as a reagent. It can also be communicated with the third reagent storage unit 8-1 in which C is stored. Similar to the first working mode, the container 2 can be a platform for preparing the measurement reagents, which can be determined by adding reagents A, B, and C of a predetermined mass or volume to the container, respectively. The measurement reagent is prepared in the blending ratio of the above, and the prepared measurement reagent is discharged from the discharge port 20 before use, or is transported to a corresponding storage unit for storage.

In the present embodiment, since the solvent 91 and the mother liquor 92 enter the container 2 from the first injection port 31 and the second injection port 41, respectively, they are mixed or cross-contaminated between the solvent 91 and the mother liquor 92 before entering the container 2. Is avoided and the accuracy of solution preparation is improved. Then, the peristaltic pump 32 and the electric syringe 42 alternately send liquids, and liquids of different circuits are injected into the container at different times. Therefore, the weighing result of the electronic balance 1 is a specific circuit (a circuit that extracts the liquid). ) Can only reflect the weight of the injected liquid in, simplifying the method of identifying weight parameters.

It should be noted that the combined use of the peristaltic pump 32 and the electric syringe 42 is advantageous in selecting an appropriate liquid delivery device in response to the needs of different doses, in which the peristaltic pump 32 is used for a large amount of liquid. Used to control the infusion, the electric syringe 42 is used to control the infusion of a small amount of liquid.

According to the above embodiment, the solution automation preparation module of the water quality analyzer provided by the present embodiment weighs the liquid 9 before and after it is transported to the container 2 by the electronic balance 1, and the liquid 9 is measured. Can increase the weight of the container 2 even if it hangs down on the wall, and is reflected in the measurement result obtained by the information output module 11 of the electronic balance 1, so that the measurement result is not affected.

Therefore, the measurement of the electronic balance 1 has higher accuracy than the conventional volume measurement method, and the solution can be prepared more accurately. Further, the electronic balance 1 has high sensitivity (or low detection limit) and can measure a very small amount of liquid relatively accurately, so that it is also suitable for preparing a solution having a very low concentration.

Although the embodiments of the utility model have been described above with reference to the drawings, it can be easily understood by those skilled in the art that the scope of protection of the utility model is not limited to these specific embodiments. Those skilled in the art may make substantial changes or replacements to the relevant technical features on the premise that they do not deviate from the idea of the Utility Model, and the technical proposals after these changes or replacements are included in the scope of protection of the Utility Model. It is a thing.

1 Electronic balance 11 Information output module 2 Container 20 Discharge port 3 First liquid delivery device 31 First injection port 32 Perturbation pump 4 Second liquid delivery device 41 Second injection port 42 Electric syringe 5 Control system 51 Detector 52 PC system 6 Solvent storage 7 Mother liquor storage 8 Standard sample solution storage 6-1 First reagent storage 7-1 Second reagent storage 8-1 Third reagent storage 9 Liquid 91 Solvent 92 Mother liquor 93 Standard sample solution
10 Storage

Claims (10)

With the container
A water quality analyzer including a liquid feeding device that communicates with the container and transports a plurality of types of liquids to the container.
An electronic balance on which the container is placed and measures the container and the liquid in the container,
A water quality analyzer installed on the electronic balance and having an information output module that outputs information measured by the electronic balance. The water quality analyzer according to claim 1, wherein the liquid feeding device is communicatively connected to the electronic balance through the information output module. The water quality analyzer according to claim 1 or 2, further comprising a control system for communicating and connecting the electronic balance and the liquid feeding device, respectively. The container has a first inlet and a second inlet.
The liquid feeding device is
A first liquid feeding device that communicates with the first injection port of the container, and a second liquid feeding device that communicates with the second injection port of the container.
The water quality analyzer according to claim 1 or 2, wherein the water quality analyzer is characterized by having. A solvent storage unit that communicates with the inlet of the first liquid feeding device,
The water quality analyzer according to claim 4, further comprising a mother liquor storage unit communicating with an inlet of the second liquid feeding device. A standard sample solution storage unit that communicates with the inlet of the second liquid feeding device.
The water quality analyzer according to claim 5, further comprising. A first reagent storage unit communicating with the inlet of the first liquid feeding device and a second reagent storage unit communicating with the inlet of the second liquid feeding device.
The water quality analyzer according to claim 5 or 6, further comprising. The water quality according to claim 7, wherein the solvent storage unit or the first reagent storage unit is installed on the inlet side of the first liquid feeding device and includes a first switching valve for switching continuity with the first liquid feeding device. Analysis equipment. The mother liquor storage unit, the standard sample solution storage unit, or the second reagent storage unit is installed on the inlet side of the second liquid feeding device and includes a second switching valve for switching continuity with the second liquid feeding device. The water quality analyzer according to claim 7. The water quality analyzer according to any one of claims 4 to 7, wherein the first liquid feeding device is a peristaltic pump, and the second liquid feeding device is an electric syringe.

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