CN108106917A - A solution mixing pool cleaning and drying method - Google Patents

Abstract

The invention discloses a method for cleaning and drying a solution mixing tank, which comprises the following steps: the first step is as follows: the control panel B controls the second injection pump (5) to suck diluent from the diluent bottle and inject the diluent into the mixed solution pool (1), the upper computer sends a fourth control signal to the circuit control panel, the electromagnetic stirrer (7) is started to stir and clean the mixed solution pool (1), and after the cleaning is finished, the peristaltic pump is controlled to discharge by a third control signal; and step two, the peristaltic pump is controlled to be started through a third control signal, and meanwhile, the electromagnetic stirrer (7) is started through a fourth control signal, so that the stirrer (73) rotates, and the mixed solution pool (1) is dried quickly. The automatic calibration device of the water quality on-line analyzer can be automatically cleaned and dried, and the influence of residual liquid on the next solution preparation is prevented.

Description

A solution mixing pool cleaning and drying method

technical field

The invention relates to a solution mixing design method, in particular to a solution mixing design in a water quality analyzer calibration device.

Background technique

In the environmental water body monitoring system, the online water quality analyzer is generally used to detect the water body parameters. Whether the detection accuracy of the online water quality analyzer meets the requirements of the national verification regulations, the measurement performance of the online water quality analyzer is generally calibrated manually, and the manual detection The time period of the online analyzer is long (typically 36 hours). How to set the mixing of the solutions in the calibration device of the water quality analyzer is a major factor affecting the preparation of the solution of the calibration device.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a solution mixing device and a mixing method with high solution preparation precision.

Technical scheme: in order to achieve the above object, the technical scheme adopted in the present invention is:

A solution mixing device, comprising a solution mixing tank (1), a mixing tank liquid inlet pipe (2), a first syringe pump (4), a first liquid inlet pipe (41), a first liquid outlet pipe (42), a first Two syringe pumps (5), a second liquid inlet pipe (51), a second liquid outlet pipe (52), and an electromagnetic stirrer (7), wherein:

The liquid inlet end of the first syringe pump (4) is used to connect with the standard mother solution bottle through the first liquid inlet pipe (41), and the liquid outlet end is connected with the solution mixing pool (1) through the first liquid outlet pipe (42) connected. The liquid inlet end of the second syringe pump (5) is used to connect with the diluent bottle through the second liquid inlet pipe (51), and the liquid outlet end is connected to the solution mixing tank (1) through the second liquid outlet pipe (52). connected. The solution mixing tank (1) comprises an open main tank body (11), a tank cover (12), and the tank cover (12) is used to cover the opening of the main tank body (11) to close the main tank body (11). Tank body (11). The bottom of the main tank body (11) is provided with a liquid inlet channel (111), a detection liquid outflow channel (112) and a liquid discharge channel (113).

Described electromagnetic stirrer (7) comprises electromagnet holder (71), electromagnet (72), stirrer (73), and described electromagnet holder (71) is used for electromagnet (72) is fixed on main groove The bottom of the body (11), and the stirring bar (73) is arranged in the inner cavity of the main tank body (11).

Further: it also includes a Y-shaped tee (3), and the Y-shaped tee (3) is a pipe fitting with two inlets and one outlet, which are respectively the first inlet pipe, the second inlet pipe and the first outlet pipe. One end of the liquid inlet pipe (2) of the mixing tank is connected with the first outlet pipe, and the other end is connected with the solution mixing tank (1). One end of the first liquid outlet pipe (42), the first liquid outlet one-way valve (44) and the first inlet pipe are connected in sequence, and the other end of the first liquid outlet pipe (42) is connected with the standard mother liquor bottle. Outlet connection. One end of the second liquid outlet pipe (52), the second liquid outlet one-way valve (54) and the second inlet pipe are connected in sequence, and the other end of the second liquid outlet pipe (52) is connected to the diluent bottle. Outlet connection. The connection between the first inlet pipe and the first liquid outlet pipe (42) is provided with a first liquid inlet check valve (43) to prevent liquid backflow, and the second inlet pipe and the second liquid outlet pipe ( 52) is provided with a second liquid inlet one-way valve (53) to prevent liquid backflow.

Preferably: the distance L from the closing port of the first liquid outlet check valve (44) to the outlet of the first inlet pipe is less than 4 times the pipe diameter R at the outlet end of the first liquid outlet check valve (44). The distance L from the closing port of the second liquid outlet check valve (54) to the outlet of the second inlet pipe is less than 4 times the pipe diameter R at the outlet end of the second liquid outlet check valve (54).

Preferably: the included angle between the first inlet pipe and the second inlet pipe is 45°.

Preferably: the liquid inlet of the liquid discharge channel (113) is located at the bottom of the inner chamber of the main tank body (11), and the liquid inlet of the liquid inlet channel (111) is higher than that of the detection liquid outflow channel (112). The liquid inlet, meanwhile, the liquid inlet of the liquid discharge channel (113) is lower than the liquid inlet of the detection liquid outflow channel (112), and the detection liquid outflow channel (112) is used for connecting sampling inspection equipment.

A solution mixing method, comprising the steps of:

Step 1, start the first syringe pump (4) to draw the standard solution mother solution from the standard mother solution bottle. Start the second syringe pump (5) to draw the diluent from the diluent bottle, and start the electromagnetic stirrer (7) to stir.

Step 2, first control the second syringe pump (5) to inject the diluent into the solution mixing pool (1), and then control the first syringe pump (4) to inject the standard solution mother liquor into the solution mixing pool (1).

Step 3, when the mother solution of the standard solution is injected, continue to control the second syringe pump (5) to inject the diluent into the solution mixing pool (1).

Step 4, when the solution is injected into the solution mixing tank (1), wait for the electromagnetic stirrer (7) to stir the solution evenly, and then turn off the electromagnetic stirrer (7).

Preferably: in step 3, continue to control the second syringe pump (5) to inject the diluent into the solution mixing tank (1) at least one-fifth of the diluent.

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

The invention has higher degree of automation and higher precision of solution mixing.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is a schematic diagram of the principle of an automatic calibration device for an online water quality analyzer;

Fig. 3 is a schematic diagram of the workflow of the automatic calibration device of the water quality online analyzer;

Fig. 4 is the structural representation of solution mixing tank;

Fig. 5 is the three-dimensional schematic view of solution mixing tank;

Fig. 6 is a structural schematic diagram of an electromagnetic fixing seat;

Fig. 7 is a schematic diagram of the structure of the tank cover;

Fig. 8 is a structural schematic diagram of the tee.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

A solution mixing device, as shown in Figure 1, comprises a solution mixing tank (1), a mixing tank liquid inlet pipe (2), a first syringe pump (4), a first liquid inlet pipe (41), a first liquid outlet Pipe (42), second syringe pump (5), second liquid inlet pipe (51), second liquid outlet pipe (52), electromagnetic stirrer (7), wherein:

The liquid inlet end of the first syringe pump (4) is used to connect with the standard mother solution bottle through the first liquid inlet pipe (41), and the liquid outlet end is connected with the solution mixing pool (1) through the first liquid outlet pipe (42) connected. The liquid inlet end of the second syringe pump (5) is used to connect with the diluent bottle through the second liquid inlet pipe (51), and the liquid outlet end is connected to the solution mixing tank (1) through the second liquid outlet pipe (52). connected. The solution mixing tank (1) comprises an open main tank body (11), a tank cover (12), and the tank cover (12) is used to cover the opening of the main tank body (11) to close the main tank body (11). Tank body (11). The bottom of the main tank body (11) is provided with a liquid inlet channel (111), a detection liquid outflow channel (112) and a liquid discharge channel (113).

Described electromagnetic stirrer (7) comprises electromagnet holder (71), electromagnet (72), stirrer (73), and described electromagnet holder (71) is used for electromagnet (72) is fixed on main groove The bottom of the body (11), and the stirrer (73) is arranged in the inner cavity of the main tank body (11); the liquid inlet channel (111), the detection liquid outflow channel (112) and the liquid discharge channel (113) Located under the stirring bar (73).

It also includes a Y-shaped tee (3), and the Y-shaped tee (3) is a pipe fitting with two inlets and one outlet, which are respectively the first inlet pipe, the second inlet pipe and the first outlet pipe. One end of the liquid inlet pipe (2) of the mixing tank is connected with the first outlet pipe, and the other end is connected with the solution mixing tank (1). One end of the first liquid outlet pipe (42), the first liquid outlet one-way valve (44) and the first inlet pipe are connected in sequence, and the other end of the first liquid outlet pipe (42) is connected with the standard mother liquor bottle. Outlet connection. One end of the second liquid outlet pipe (52), the second liquid outlet one-way valve (54) and the second inlet pipe are connected in sequence, and the other end of the second liquid outlet pipe (52) is connected to the diluent bottle. Outlet connection. The connection between the first inlet pipe and the first liquid outlet pipe (42) is provided with a first liquid inlet check valve (43) to prevent liquid backflow, and the second inlet pipe and the second liquid outlet pipe ( 52) is provided with a second liquid inlet one-way valve (53) to prevent liquid backflow.

The purpose of setting the Y-shaped tee (3) is mainly to reduce the length of the pipeline between the first syringe pump (4), the second syringe pump (5) and the solution mixing tank (1), that is, the mixing tank inlet pipe (2 ) can be two pipelines or one pipeline, if the first syringe pump (4) and the second syringe pump (5) communicate with the solution mixing tank (1) with two pipelines respectively, then the pipeline The dead volume in the pipeline affects the configuration accuracy of the solution. Therefore, the present invention uses a Y-shaped tee (3) to combine the two pipelines into one pipeline, which reduces the length of the pipeline and further reduces the dead volume in the pipeline. The volume improves the configuration accuracy of the solution.

The first liquid outlet check valve (44) has two purposes. The first one is to prevent the liquid from flowing back from the Y-shaped tee (3). When the distance L to the outlet of the first inlet pipe is less than 4 times the diameter R of the outlet end of the first liquid outlet check valve (44), the first liquid outlet check valve (44) and the outlet of the first inlet pipe form a turbulent flow structure. When the first liquid stops flowing into the liquid inlet pipe (2) of the mixing pool, there is the first liquid between the closing port of the first liquid outlet check valve (44) and the outlet of the first inlet pipe. When the second liquid continues to pass through the Y Type tee (3) flows into the liquid inlet pipe (2) of the mixing tank. Due to the angle between the first inlet pipe and the second inlet pipe, the second liquid flowing out from the second inlet pipe rushes to the first inlet pipe The outlet collides with the outlet of the first inlet pipe, and the second liquid after the collision forms a turbulent flow, agitating the solution in and around the outlet of the first inlet pipe and in the first liquid outlet check valve (44), and then enters the first outlet In the liquid check valve (44), when the turbulent flow moves to the closing port of the first liquid outlet check valve (44), due to the blocking of the closing port, the turbulent flow returns, and the return of the turbulent flow will push the first liquid outlet check valve (44) The solution in the first liquid outlet check valve (44) is brought out, and then the exchange of the solution in the first liquid outlet check valve (44) is realized, that is, the first liquid that exists between the closing port of the first liquid outlet check valve (44) and the outlet of the first inlet pipe. The liquid is gradually diluted and brought out by the action of turbulent flow, so as to avoid the influence of residual liquid on the preparation of the solution, thereby improving the preparation accuracy of the solution. In the same way, the setting purpose of the second liquid outlet check valve (54) can be known.

The distance L from the closed port of the first liquid outlet check valve (44) to the outlet of the first inlet pipe is less than 4 times the pipe diameter R at the outlet end of the first liquid outlet check valve (44), and the second liquid outlet check valve (44) is The distance L from the closing port of the valve (54) to the outlet of the second inlet pipe is less than 4 times the pipe diameter R at the outlet end of the second liquid outlet check valve (54). The shorter the distance L from the closed mouth of the first liquid outlet check valve (44) to the outlet of the first inlet pipe, the better. The shorter the distance, the greater the turbulence effect, which can better resist the second liquid outlet check valve ( 54) Solution at the closed port. The Y-shaped tee (3) only needs to ensure that there is an angle between the first inlet pipe and the second inlet pipe. The best angle is 45°. It is made of PTEF material. The Y-shaped tee with a specific angle makes the calibration device The connecting lines should be as short as possible with as little dead volume as possible.

The distance L from the closing port of the first liquid outlet check valve (44) to the outlet of the first inlet pipe is less than 4 times the pipe diameter R at the outlet end of the first liquid outlet check valve (44). The distance L from the closing port of the second liquid outlet check valve (54) to the outlet of the second inlet pipe is less than 4 times the pipe diameter R at the outlet end of the second liquid outlet check valve (54). The shorter the distance L from the closed mouth of the first liquid outlet check valve (44) to the outlet of the first inlet pipe, the better. The shorter the distance, the greater the turbulence effect, which can better resist the second liquid outlet check valve ( 54) Solution at the closed port.

The liquid inlet of the liquid discharge channel (113) is located at the bottom of the inner cavity of the main tank body (11), and the liquid inlet of the liquid inlet channel (111) is higher than the liquid inlet of the detection liquid outflow channel (112) , while the liquid inlet of the liquid discharge channel (113) is lower than the liquid inlet of the test liquid outflow channel (112), and the test liquid outflow channel (112) is used for connecting sampling inspection equipment. The liquid inlet channel (111), the detection liquid outflow channel (112) and the liquid discharge channel (113) are located below the stirring bar (73). Adopt the liquid inlet channel (111) to be arranged on the bottom of the inner cavity, and be positioned at the below of the stirring bar 73, make diluent and standard mother liquor enter the solution mixing pool (1) from the bottom of the solution mixing pool (1), prevent the stirring bar 73 from rotating like this When the diluent and the standard mother liquor are blown on the inner wall of the solution mixing tank (1), the mixing accuracy of the solution is affected. In addition, when there is a solution in the solution mixing tank (1), the stirring bar starts to work to mix the test solution and speed up the mixing speed. The invention adopts the solution to mix the pool from the bottom of the pool, and at the same time, the top is covered, and this structure can reduce the influence of the evaporation of the solution and the phenomenon of solution hanging on the wall of the mixing pool on the preparation accuracy. Therefore, there is no need to stop stirring when sampling and injecting.

A solution mixing method, comprising the steps of:

Step 1, start the first syringe pump (4) to draw the standard solution mother solution from the standard mother solution bottle. Start the second syringe pump (5) to draw the diluent from the diluent bottle, and start the electromagnetic stirrer (7) to stir.

Step 2, first control the second syringe pump (5) to inject the diluent into the solution mixing pool (1), and then control the first syringe pump (4) to inject the standard solution mother liquor into the solution mixing pool (1).

Step 3, when the mother solution of the standard solution is injected, continue to control the second syringe pump (5) to inject the diluent into the solution mixing pool (1). Continue to control the second syringe pump (5) to inject the diluent into the solution mixing tank (1) at least one-fifth of the diluent.

Step 4, when the solution is injected into the solution mixing tank (1), wait for the electromagnetic stirrer (7) to stir the solution evenly, and then turn off the electromagnetic stirrer (7).

As shown in Figure 2-8, the present invention is used for the configuration of the solution in the automatic calibration device of the online water quality analyzer, and the automatic calibration device of the online water quality analyzer includes a host computer, a first control module A, a second control module B, The third control module C, circuit control board, peristaltic pump (6), electromagnetic stirrer (7) and solution mixing device, wherein:

Described electromagnetic stirrer (7) comprises electromagnet holder (71), electromagnet (72), stirrer (73), and described electromagnet holder (71) is used for electromagnet (72) is fixed on main groove The bottom of the body (11), and the stirring bar (73) is arranged in the hollow groove. The center of the electromagnet fixing seat (71) is provided with a fixing seat through hole (711); the drain pipe passes through the fixing seat through hole (711) and communicates with the drainage channel (113), and the peristaltic pump (6) is arranged on the row on the liquid pipe.

The present invention adopts electromagnetic stirrer (7), has two purposes, and the one, convenient solution enters and exits solution mixing pool 1, quickens the mixing of solution, and the 2nd, quickens the drying of main tank body (11). When the solution is mixed, since the stirring bar (73) rotates under the action of the electromagnet (72), the solution is mixed more uniformly through the rotation of the stirring bar (73). When drying, wind is generated by the rotation of the stirrer (73), and the generated wind rotates in the hollow groove in the main tank body (11) to accelerate the evaporation of the solution on the inner wall of the main tank body (11), and then through the peristaltic pump (6) The suction function draws out the moist air from the main tank body (11), thus speeding up the drying of the main tank body (11), and avoiding the residual liquid from affecting the configuration accuracy of the next solution.

The first control module A is used to control the suction and push operation of the first syringe pump (4) according to the first control signal sent by the host computer, and the first syringe pump (4) is used to control the standard mother liquor according to the first control signal The bottle is sucked, and after the sucking, the liquid is pushed into the solution mixing pool (1) according to the first control signal.

The second control module B is used to control the suction and push operation of the second syringe pump (5) according to the second control signal sent by the host computer, and the second syringe pump (5) is used to dilute the diluent according to the second control signal. The bottle is sucked, and after the sucking, the liquid is pushed into the solution mixing pool (1) according to the second control signal.

The third control module C is used to control the peristaltic pump (6) to suck the solution mixing pool (1) according to the third control signal sent by the host computer;

The circuit control board is used to control the electromagnetic stirrer (7) to stir according to the fourth control signal sent by the host computer;

The water quality analyzer is used to detect the liquid coming in from the detection liquid pipe (8), and upload the detection result to the host computer;

The host computer is used to send a first control signal, a second control signal, a third control signal and a fourth control signal to the first control module A, the second control module B, the third control module C and the circuit control board; at the same time The upper computer is used to receive the detection result of the water quality analyzer, and obtain the judgment report of the water quality analyzer according to the detection result and the technical indicators of the national verification regulations.

A water quality online analyzer calibration method, comprising the following steps:

Step 1: The inspector connects the communication port of the tested water quality analyzer with the communication port of the upper computer of the calibration device, and connects the sampling system of the tested water quality analyzer with the detection liquid pipe (8).

Step 2, the standard mother liquor bottle that standard solution mother liquor is housed is communicated with the first liquid inlet pipe (41); The diluent liquid bottle that diluent is housed is communicated with the second liquid inlet pipe (51); And the diluted solution concentration is input to the host computer.

Step 3, the host computer calculates and obtains the amount of the standard solution mother solution and the amount of the diluent according to the concentration of the standard solution mother solution and the diluted solution concentration, and then obtains the feed rate of the first syringe pump (4) and the second syringe pump (5) ) feeding amount; the upper computer sends the first control signal to the first control module A according to the feeding amount of the first syringe pump (4), and sends the second control signal to the second control module B according to the feeding amount of the second syringe pump (5). For the control signal, the upper computer sends the fourth control signal to the circuit control board, and sends the fourth control signal to the second control module B.

Step 4, the first control module A controls the first syringe pump (4) to draw the standard solution mother solution from the standard mother solution bottle according to the first control signal; the second control module B controls the second syringe pump (5) from the diluted solution according to the second control signal The liquid bottle absorbs the diluent; the second control module B controls the second syringe pump (5) to inject the diluent into the solution mixing pool (1) according to the second control signal, and then the first control module A controls the second injection pump (5) according to the first control signal. A syringe pump (4) injects the mother solution of the standard solution into the solution mixing pool (1), and the mother solution of the standard solution is injected at least when the injection of the diluent is completed.

Step 5, the circuit control board controls the electromagnet (72) to stir and drive the stirring bar (73) according to the fourth control signal, and then stirs the liquid in the solution mixing tank (1).

Step 6: After the solution preparation is completed, the computer sends a sampling command to the tested water quality analyzer, and the tested water quality analyzer accepts the command to sample the solution in the solution mixing pool (1), and the tested water quality analyzer collects the water quality analysis information Upload to the host computer; and analyze the indication error, zero drift, indication stability, etc. After the analysis is completed, the analysis data will be sent to the computer.

Step 7: The upper computer analyzes, detects and automatically calibrates the tested water quality analyzer according to the analysis information of the tested water quality analyzer, and generates a judgment report, and the data results are traceable.

Automatic calibration means that the calibration device realizes the instruction sending and data receiving of the instrument through the communication protocol provided by the water quality online analyzer manufacturer, and completes the "indication error", "zero drift" and For the testing of items such as "indicating value stability", the calibration items can be adjusted according to the different instruments to be tested, not limited to the above three items. Automatically means that after the experimenter selects the experiment option, during the entire calibration process, there is no need to manually replace reagents, do not need to be on duty, and do not need to manually record data. The whole process is automatically completed by the calibration device.

The items analyzed and detected by the host computer to the tested water quality analyzer include indication error, zero drift, and indication stability.

7.1 Detection process and calculation method of indication error (COD)

After the water quality analyzer runs stably, introduce COD standard solutions with mass concentrations of _CS (50, 150, 500mg/L) in sequence to measure respectively, each solution is measured continuously for 3 times, and the indication error is calculated according to the following formula :

Among them, ΔC represents the indication error, Indicates the average value of the concentration measured by the tested water quality analyzer, and C _S indicates the concentration of the diluted solution.

7.2 Detection process and calculation method of zero drift (COD):

After the water quality analyzer runs stably, the computer controls the first syringe pump (4) and the second syringe pump (5) to prepare a zero point calibration solution to the solution mixing tank (1), and introduce the prepared zero point calibration solution into the tested water quality analysis Measure the zero-point calibration liquid with the instrument, record the measured initial zero value Z ₀ , introduce the zero-point calibration liquid into the tested water quality analyzer every 30 minutes within 4 hours, measure the zero-point indication value Z _i , and take the zero-point indication value that deviates from Z ₀ the most Z _i is used as the maximum zero indication value Z _max , and the difference between the maximum zero indication value Z _max and the initial zero value Z ₀ is taken as the zero drift.

7.3 Detection process and calculation method of index stability (COD):

After the water quality analyzer runs stably, the computer controls the first syringe pump (4) and the second syringe pump (5) to prepare a standard calibration solution to the solution mixing tank (1); import the prepared standard calibration solution into the tested water quality analyzer Solution, record the initial measurement value S0, and run continuously for 24 hours; introduce a standard calibration solution to the tested water quality analyzer every 1 hour within 24 hours, measure the measurement value Si, and take the measurement value Si that deviates from the initial measurement value S0 as the maximum measurement Value Smax, calculate the indication stability according to the following formula:

ΔS represents the stability of the indication, S _max represents the maximum measured value, and S ₀ represents the initial measured value.

Indication error, zero drift, and indication stability indicators are the evaluation indicators of the measurement performance of the instrument in the measurement specification. During the manual evaluation, it needs to be manually on duty for 40 hours and process the data. This calibration device can replace the manual and automatically complete the evaluation of the above measurement performance. .

In the present invention, the replacement of detection solutions of different concentrations corresponding to different detection items of the same water quality analyzer to be tested is realized through the solution automatic preparation function of the calibration device, so there is no need to manually replace reagents, and the present invention uses the same device to prepare Compared with the detection solutions of different concentrations, it reduces the human error of the zero drift, the stability of the indication value and the detection results of the error of the indication value.

In addition, the host computer of the present invention can adopt computer or other central processing units, and each function can be based on Windows and Win The operating system is realized, which can send sample making instructions and receive data, and form a report after processing and calculating the data, and can give a conclusion whether the water quality analyzer to be tested is qualified or not.

Step 8, after the detection of a certain concentration solution is completed, the upper computer sends a third control signal to the third control module C, and the third control module C controls the peristaltic pump to discharge the waste liquid in the solution mixing tank, and closes after the waste liquid is discharged Peristaltic pump for preparation of the next detection concentration point;

After the waste liquid is discharged and before the preparation of the next detection concentration point, it also includes cleaning and drying the solution mixing tank. The method is as follows: the control template B controls the second syringe pump (5) to draw the diluent from the diluent bottle and inject it into the solution mixing tank In (1), the upper computer sends the fourth control signal to the circuit control board, starts the electromagnetic stirrer (7) to clean the solution mixing tank (1), after cleaning, the peristaltic pump is controlled by the third control signal to discharge, and the cleaning is done for 3 At last, the peristaltic pump is controlled by the third control signal, and the electromagnetic stirrer (7) is started by the fourth control signal, so that the stirring bar (73) rotates, and then the solution mixing pool (1) is quickly dried.

In the present invention, the uncertainty of the solution obtained by diluting the calibration device is less than 3% (k=2), and can be traced to the national standard through comparison with the national secondary standard substance, so its data data results can be traced.

In the present embodiment, the first syringe pump (4) and the second syringe pump (5) of the present invention adopt quantitative pumps, and the volume of the quantitative pumps is 10ml. When the specifications of the quantitative pumps are selected between 5ml, 10ml and 25ml, the test shows that The quantitative syringe pump adopts two specifications of 10ml, and the operability and precision of solution preparation are the highest. Quantitative pump accuracy: 2uL/step. The speed of the quantitative pump motor can be adjusted according to the actual needs. The speed of this instrument is 30 rpm (adjustable), and the test shows that the volume accuracy of the pump at this speed is the highest.

Reset mode: The quantitative pump is equipped with a photoelectric switch at the maximum push point (reset position), and the quantitative pump is reset before dosing to ensure that there is no residual liquid in the quantitative pump and each pipeline is filled with diluent before each solution is prepared .

Control of remaining liquid in the pipeline: During the preparation process, when the quantitative pump is pushing, the pipeline is always kept full of liquid, and through program optimization, the pushing of the mother liquor is always completed first, and the pushing of the diluent is completed last, ensuring that the pipeline is full The liquid used is always the diluent (pure water) to improve the reproducibility of the preparation to achieve the purpose of controlling the accuracy.

While taking into account the efficiency, choose the pipeline with a diameter of 2mm, the total length of the connecting pipeline should be as short as possible, and the diameter of the pipe should be as small as possible to reduce the dead volume. All components are connected by high temperature, acid and alkali resistant PTFE tubes, and the pipeline interface is sealed with a pressure ring, so the contact area of the connection is small and the dead volume is small. Compared with the raw material tape sealing method, the sealing performance is more reliable and the operation is more convenient. During the whole sample making process, this connection method makes the pipeline completely fixed without loosening and reduces the detection failure rate. The size of the PTFE tube is 2.85*1.25mm.

Calibration device dosing liquid, tested by the absorbance of potassium dichromate solution, the solution preparation error is less than ± 2%, the whole system has systematic deviation, at this time, when the host computer generates the first control signal and the second control signal through the repeat test, the middle The introduction of the system correction factor K can reduce the error of the mechanical liquid distribution system, making the overall error better than ±1%.

The water quality on-line analyzer of the present invention includes but not limited to chemical oxygen demand (COD) on-line analyzer, ammonia nitrogen on-line analyzer and other on-site non-laboratory water quality parameter analysis applied to water sources, industrial sewage outlets, and water body environmental monitoring points instrument.

The invention can be pushed by a single person to calibrate the water quality analyzer on site, and the mobility of the calibration device ensures that the solution can be prepared and used immediately during analysis. Compared with the traditional artificially prepared solution brought to the site for analysis, it is no longer necessary to consider low-concentration detection Solution preservation problems and site requirements for solution preparation, solution preparation has higher reproducibility.

The present invention realizes the fully automatic calibration of the online water quality analyzer, unattended, according to predetermined standards or requirements (such as national metrology verification regulations, calibration specifications and other technical specifications), and performs a series of calibration on all measurement indicators of the water quality online analyzer. Continuous and uninterrupted analysis and testing, collecting data and analyzing and processing, and judging whether the calibration results meet the relevant index requirements, and generating corresponding original calibration reports. An output port for external data communication is reserved to realize the preparation for remote collection of calibration results. The entire process is intelligently processed without manual intervention. At the same time, the device has the function of automatic maintenance, which can automatically clean and maintain during the running interval or standby state, so as to improve the reliability and stability of the device operation.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (2)

1. a kind of solution mixing pit cleaning and drying method, which is characterized in that comprise the following steps：The first step：Pass through Control architecture B The second syringe pump (5) is controlled to draw dilution from dilution bottle, is injected into mixed solution pond (1), host computer is controlled to circuit Plate sends the 4th control signal, starts magnetic stirrer (7) and is stirred cleaning to mixed solution pond (1), cleaning finishes, and passes through The control peristaltic pump discharge of 3rd control signal；Second step is controlled by the 3rd control signal and opens peristaltic pump, while passes through the 4th Control signal starts magnetic stirrer (7) so that stirrer (73) rotates, and then quickly dry mixed solution pool (1).

2. solution mixing pit cleaning and drying method according to claim 1, it is characterised in that：Cleaning time in the first step Number is 3 times or more.