阅读说明：本技术 一种多功能稀释/滴定装置 (Multifunctional dilution/titration device ) 是由 雷永乾 李冠霖 郭鹏然 梁维新 于 2020-04-26 设计创作，主要内容包括：本发明涉及一种多功能稀释/滴定装置,包括注射泵、电磁阀、稀释/滴定液瓶、原液瓶和收集瓶。其中电磁阀连接注射泵、进液管和排液管,上位机控制端连接电磁阀、注射泵及手动控制器的控制端口。本装置通过上位机控制端对电磁阀和注射泵协同控制,采用注射泵精确控制吸液和排液,电磁阀控制液体进出流路的方式实现稀释和滴定两种工作模式。稀释模式下可实现对多种不同设定参数的样品稀释,且每次样品稀释过程中稀释液可对管路进行清洗,避免待稀释原液的残留,从而提高了稀释精度。滴定模式下可设置自动滴定和手动滴定,在滴定过程中可以通过手持按键控制装置自由控制滴定速率,以在滴定终点实现精确滴定。(The invention relates to a multifunctional diluting/titrating device, which comprises an injection pump, an electromagnetic valve, a diluting/titrating liquid bottle, a raw liquid bottle and a collecting bottle. The electromagnetic valve is connected with the injection pump, the liquid inlet pipe and the liquid discharge pipe, and the control end of the upper computer is connected with the control ports of the electromagnetic valve, the injection pump and the manual controller. The device controls the electromagnetic valve and the injection pump cooperatively through the control end of the upper computer, the injection pump is adopted to accurately control liquid suction and liquid discharge, and the mode that the electromagnetic valve controls the liquid to flow in and out of the flow path realizes two working modes of dilution and titration. The dilution mode can realize diluting the samples with various different setting parameters, and the diluent can clean the pipeline in the sample dilution process at every time, so that the residue of the stock solution to be diluted is avoided, and the dilution precision is improved. Automatic titration and manual titration can be set in the titration mode, and the titration rate can be freely controlled through the handheld key control device in the titration process, so that accurate titration is realized at the titration end point.)

1. A multi-functional dilution/titration device, comprising:

an injection pump (4), a dilution/titration liquid bottle (5), a stock solution bottle (6) and collection bottles (7, 8);

and the number of the first and second groups,

the electromagnetic valve (3) is a three-way electromagnetic valve, a first channel (31) of the electromagnetic valve is communicated with the injection pump (4), a second channel (32) of the electromagnetic valve is communicated with the dilution/titration liquid bottle (5), and a third channel (33) of the electromagnetic valve is in switchable communication with the stock solution bottle (6) and the collection bottles (7, 8);

the controller (1) is used for controlling the electromagnetic valve (3) to be switched between a first state that the first channel (31) is communicated with the second channel (32) and a second state that the first channel (31) is communicated with the third channel (33);

in a first state, the syringe pump (4) is able to aspirate a dilution/titration liquid from the dilution/titration liquid bottle (5); in a second state, the syringe pump (4) is able to discharge the aspirated dilution/titration liquid.

2. The multifunctional dilution/titration device according to claim 1, wherein the dilution process of the device comprises: and controlling the electromagnetic valve (3) to a second state, drawing a set amount of stock solution to be diluted from the stock solution bottle (6) by the injection pump (4), switching the electromagnetic valve (3) to the first state, sucking a certain amount of diluent from the dilution/titration solution bottle (5) by the injection pump (4) according to a set dilution multiple, switching to the second state again, switching the third channel (33) to be communicated with the collecting bottles (7, 8), and discharging the stock solution and the diluent into the collecting bottles (7, 8) together for mixing and diluting.

3. The multifunctional dilution/titration device according to claim 1 or 2, wherein the titration process of the device comprises: the electromagnetic valve (3) is controlled to be in a first state, the injection pump (4) is communicated with the dilution/titration liquid bottle (5) and sucks the titration liquid with the volume same as that of the liquid discharge pipeline in the dilution/titration liquid bottle (5), then the electromagnetic valve (3) is controlled to be switched to be in a second state, and the sucked titration liquid is discharged to clean residual liquid in the pipeline.

4. The multifunctional dilution/titration device according to claim 2, comprising the steps of: the injection pump (4) extracts a set amount of stock solution to be diluted from the stock solution bottle (6) and temporarily stores the stock solution in a liquid discharge pipeline.

5. The multifunctional dilution/titration device according to claim 2, wherein the syringe pump (4) sucks a certain amount of the diluent from the diluent/titration liquid bottle (5) at a set dilution ratio to temporarily store in the syringe pump (4).

6. The multifunctional dilution/titration device according to claim 1, further comprising a correlation level sensor (22) disposed at a connection of the pipes for detecting whether the pipes contain liquid, by which the amount of liquid absorbed can be corrected during each operation.

7. The multifunctional dilution/titration device according to claim 6, wherein the controller (1) is an upper computer control terminal, and comprises a control circuit board, and a liquid crystal display screen, a key module and a handheld key control device (2) connected thereto, wherein the handheld key control device (2) is connected with the controller (1) through Bluetooth.

8. The multifunctional dilution/titration device according to claim 7, wherein the method of calibrating comprises:

volume correction: liquid in the pipeline connecting end (21) to the pipeline liquid suction and discharge end (27) is firstly drained, the pipeline liquid suction and discharge end (27) is inserted into the liquid for liquid suction, the system stops liquid suction when the liquid level of the pipeline reaches the correlation liquid level sensor (22) in a correction mode, and the liquid amount recorded by the control end is corrected to be the actual suction amount from the liquid inlet end to the correlation liquid level sensor (22);

and (3) rate correction: the two ends of the handheld key control device (2) are respectively provided with a left liquid level sensor (22) and a right liquid level sensor (28), liquid suction or liquid discharge runs at a set speed during correction, time difference is recorded when the liquid level of pipeline liquid passes through the two liquid level sensors (22) and the right liquid level sensor (28) respectively, and the actual flow rate is calculated through the actual volume of the pipeline and corrected at the set speed.

9. Multifunctional dilution/titration device according to one of claims 1-8, wherein the hand-held key control device (2) is adapted to perform specific control operations comprising: the status indicator lamp is used for displaying the liquid inlet type and the liquid inlet status, wherein the red light is normally on to indicate the standby status of the instrument, the red flicker indicates the fault or unknown error of the instrument, the green flicker indicates the normal running status, and the green flicker indicates the pause status;

and three operation keys including start/pause/stop, speed up and speed down keys.

10. The multifunctional dilution/titration device according to claim 9, wherein during titration, the syringe pump (4) draws 3/4 range titration solution, and then the solenoid valve switches, and the titration solution titrates the sample at a set rate or a manually adjusted rate, controlled by the hand-held push-button control device (2).

Technical Field

The utility model belongs to the technical field of instrument and equipment, concretely relates to multi-functional dilution/titration outfit can be applied to occasions such as solution preparation, standard solution preparation, sample dilution and pollutant survey in trades such as environmental detection analysis, mineral analysis, pharmaceutical analysis.

Background

Solution dilution and solution preparation are conventional operations in the analysis and detection process, and are frequently encountered in the preparation process of actual samples and standard solutions. Because the solution dilution operation has high requirements on the liquid sampling precision, errors are inevitably generated in the existing manual operation process, and the dilution operation required by the dilution of a sample and the preparation of a standard solution is frequent in the actual detection process. Pipettes commonly used in the dilution process of organic solutions and inorganic solutions need different types and specifications in the use process, and cross contamination is easily caused in long-term experiments. The existing dilution instrument has the residue of stock solution in a pipeline in the using process, so that an error exists in the dilution process. This system adopts stoste imbibition and diluent to discharge the share pipeline, when realizing that a small amount of stostes absorb, the complete washing of diluent to avoid the stoste to remain at the pipeline and lead to the error that the sample dilutes. The device has the advantages of simple implementation mode, concise structural design, universality and easy obtainment of the composition units, low cost, capability of realizing accurate dilution and capability of realizing precise titration.

Disclosure of Invention

The invention aims to provide a high-precision automatic liquid preparation, automatic dilution or accurate titration device. In order to realize the purpose of the invention patent, the adopted technical scheme is as follows:

a multifunctional dilution/titration apparatus, comprising:

an injection pump, a dilution/titration liquid bottle, a raw liquid bottle and a collection bottle;

and the number of the first and second groups,

the electromagnetic valve is a three-way electromagnetic valve, a first channel of the electromagnetic valve is communicated with the injection pump, a second channel of the electromagnetic valve is communicated with the dilution/titration liquid bottle, and a third channel of the electromagnetic valve is communicated with the raw liquid bottle and the collection bottle in a switchable manner;

the controller is used for controlling the electromagnetic valve to switch between a first state that the first channel is communicated with the second channel and a second state that the first channel is communicated with the third channel;

in a first state, the syringe pump is capable of aspirating a dilution/titration solution from the dilution/titration solution bottle; in a second state, the syringe pump is able to expel the aspirated dilution/titration liquid.

According to the scheme, the dilution process of the device comprises the following steps: and controlling the electromagnetic valve to a second state, pumping a set amount of stock solution to be diluted from the stock solution bottle by the injection pump, switching the electromagnetic valve to the first state, sucking a certain amount of diluent from the dilution/titration solution bottle by the injection pump according to a set dilution multiple, switching to the second state again, switching the third channel to be communicated with the collecting bottle, and discharging the stock solution and the diluent into the collecting bottle together for mixing and diluting.

According to the scheme, the titration process of the device comprises the following steps: and controlling the electromagnetic valve to a first state, communicating the injection pump with the dilution/titration liquid bottle, sucking the titration liquid with the volume same as that of the liquid discharge pipeline in the dilution/titration liquid bottle, then controlling the electromagnetic valve to switch to a second state, and injecting the sucked titration liquid into the stock solution bottle.

According to the scheme, the method comprises the following steps: the injection pump extracts a set amount of stock solution to be diluted from the stock solution bottle and temporarily stores the stock solution in a liquid discharge pipeline.

According to the scheme, the injection pump sucks a certain amount of diluent from the diluent/titrant bottle according to the set dilution times and temporarily stores the diluent in the injection pump.

According to the scheme, the device also comprises a correlation liquid level sensor arranged at the joint of the pipelines and used for detecting whether the pipelines have liquid or not, and the correlation liquid level sensor can correct the liquid absorption amount in the operation process every time.

According to the scheme, the correction method comprises the following steps:

volume correction: the liquid in the pipeline connecting end to the pipeline liquid sucking and discharging end is firstly emptied, the pipeline liquid sucking and discharging end is inserted into the liquid for sucking the liquid, the system stops sucking the liquid when the liquid level of the pipeline reaches the correlation liquid level sensor in a correction mode, and the liquid amount recorded by the control end is corrected to be the actual sucking amount from the liquid inlet end to the position of the correlation liquid level sensor;

and (3) rate correction: the two ends of the hand-held key controller are respectively provided with a left liquid level sensor and a right liquid level sensor, liquid suction or liquid discharge runs at a set speed during correction, time difference is recorded when the liquid level of the pipeline liquid passes through the two liquid level sensors respectively, the actual flow rate is calculated through the actual volume of the pipeline, and the set speed is corrected.

According to the scheme, the controller is an upper computer control end and comprises a control circuit board, a liquid crystal display screen, a key module and a handheld key control device, wherein the liquid crystal display screen, the key module and the handheld key control device are connected with the control circuit board, and the handheld key control device is used for executing specific control operation.

According to the scheme, in the titration process, the injection pump extracts 3/4-range titration solution, then the electromagnetic valve is switched, the control is carried out through the manual key controller, and the titration solution titrates the sample according to the set rate or the manual regulation rate.

According to the above scheme, the hand-held key control device comprises: the status indicator lamp is used for displaying the liquid inlet type and the liquid inlet status, wherein the red light is normally on to indicate the standby status of the instrument, the red flicker indicates the fault or unknown error of the instrument, the green flicker indicates the normal running status, and the green flicker indicates the pause status;

and three operation keys including start/pause/stop, speed up and speed down keys.

The invention has the following beneficial effects:

1. the stock solution to be diluted is sucked by a liquid discharge pipeline, is only stopped in the pipeline and is completely discharged during dilution, and the diluent can clean the pipeline in the sample dilution process every time, so that the residue of the stock solution to be diluted is avoided, the dilution precision is improved, and the mode effectively avoids the cross contamination of the sample in the sample dilution process for many times.

2. The manual key controller realizes flexible control of the liquid suction and discharge processes in the liquid suction and discharge transfer process. The manual key control can freely control the liquid discharge and liquid suction rate in the dilution and titration processes, the start, pause and stop of the dilution process can be controlled by the key in the running process of the device, the running state is judged according to the indicator lamp, and the operation is flexible. The manual controller is communicated with the host through Bluetooth wireless connection, the operation is convenient, the interference of a communication line in the operation process is avoided, the liquid level sensor is convenient to correct the liquid absorption amount in the operation process at every time, and the accuracy is improved.

3. The handheld key control device is synchronous with the functions of keys and a display module at the control end of the upper computer, and the liquid discharge/absorption amount and the operation terminal point can be displayed or recorded at the display end in real time through the operation flow controlled by the manual end. The flexibility is obviously improved in the actual operation process.

4. The initial parameters can be set with a plurality of groups of sample parameters, the control end of the upper computer automatically records the sample number and the solution amount in the operation process, and when one sample is finished, the next sample can be quickly switched through the hand-held key control device, so that the working efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram (dilution mode) of a multifunctional dilution/titration apparatus disclosed in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram (titration mode) of the multifunctional dilution/titration apparatus disclosed in the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a handheld key control device of the multifunctional dilution/titration device disclosed in the embodiment of the present invention.

In the figure: 1. host computer control end, 2, handheld button controlling means, 3, solenoid valve, 31, solenoid valve first passageway, 32, solenoid valve second passageway, 33, solenoid valve third passageway, 4, syringe pump, 5, dilution/titration liquid bottle, 6, former liquid bottle, 7, receiving flask 1, 8, receiving flask 2, 21, connecting line, 22, left level sensor, 23, status indicator lamp, 24, first button, 25, second button, 26, third button, 27, inhale the flowing back pipeline, 28, right level sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A multifunctional dilution/titration apparatus, comprising: an injection pump 4 (driven by a stepping motor), a dilution/titration liquid bottle 5, a stock solution bottle 6 and collection bottles 7 and 8; the electromagnetic valve 3 is a three-way electromagnetic valve, a first channel 31 of the electromagnetic valve is communicated with the injection pump 4, a second channel 32 of the electromagnetic valve is communicated with the dilution/titration liquid bottle 5, and a third channel 33 of the electromagnetic valve is switchably communicated with the stock solution bottle 6 and the collection bottles 7 and 8; a controller for controlling the electromagnetic valve 3 to switch between a first state in which the first passage 31 is communicated with the second passage 32 and a second state in which the first passage 31 is communicated with the third passage 33; in a first state, the syringe pump 4 is able to suck up a dilution/titration liquid from the dilution/titration liquid bottle 5; in a second state, the syringe pump 4 is able to expel the aspirated dilution/titrant.

In the present application, the dilution process of the device comprises: and controlling the electromagnetic valve 3 to a second state, pumping a set amount of stock solution to be diluted from the stock solution bottle 6 by the injection pump 4, switching the electromagnetic valve 3 to the first state, sucking a certain amount of diluent from the dilution/titration solution bottle 5 by the injection pump 4 according to a set dilution multiple, switching to the second state again, switching the third channel 33 to be communicated with the collecting bottle 7, 8, and discharging the stock solution and the diluent into the collecting bottle 7, 8 for mixing and diluting.

According to the scheme, the titration process of the device comprises the following steps: the electromagnetic valve 3 is controlled to be in a first state, the injection pump 4 is communicated with the dilution/titration liquid bottle 5 and absorbs the titration liquid with the same volume as the liquid discharge pipeline in the dilution/titration liquid bottle 5, the dilution liquid with the same volume as the liquid discharge pipeline is absorbed from the dilution/titration liquid bottle 5 and is emptied to achieve the purpose of cleaning the pipeline, so that the cleaning of the liquid discharge pipeline can be completed before dilution, then the electromagnetic valve 3 is controlled to be switched to be in a second state, and the absorbed titration liquid is emptied.

According to the scheme, the method comprises the following steps: the syringe pump 4 draws a set amount of stock solution to be diluted from the stock solution bottle 6 and temporarily stores the same in the drain line.

According to the scheme, the injection pump 4 sucks a certain amount of diluent from the diluent/titrant bottle 5 according to the set dilution times and temporarily stores the diluent in the injection pump 4.

According to the scheme, the device also comprises correlation type liquid level sensors 22 and 28 arranged at the joints of the pipelines and used for detecting whether the pipelines have liquid or not, and the correlation type liquid level sensors can correct the liquid absorption amount in each operation process.

According to the scheme, the correction method comprises the following steps:

volume correction: the liquid in the pipeline connecting end 21 to the pipeline liquid sucking and discharging end 27 is firstly drained, the pipeline liquid sucking and discharging end 27 is inserted into the liquid for sucking, the system stops sucking when the liquid level of the pipeline reaches the correlation liquid level sensors 22 and 28 in the correction mode, and the liquid amount recorded by the control end is corrected to be the actual sucking amount from the liquid inlet end to the correlation liquid level sensors 22 and 28.

And (3) rate correction: the two ends of the controller are respectively provided with a liquid level sensor, liquid suction or liquid discharge runs at a set speed during correction, time difference is recorded when the liquid level of the pipeline liquid passes through the two liquid level sensors respectively, the actual flow rate is calculated through the actual volume, and the set speed is corrected.

Through the correction method, the titration/dilution precision of the whole device is greatly improved, and the volume correction and the rate correction can be used respectively or in combination.

According to the scheme, the controller 1 is an upper computer control end and comprises a control circuit board, a liquid crystal display screen, a key module and a handheld key control device 2, wherein the liquid crystal display screen, the key module and the handheld key control device 2 are connected with the control circuit board, and the handheld key control device 2 is used for executing specific control operation.

In one embodiment of the present application, the dilution mode and method are summarized as follows:

as shown in fig. 1, the device comprises an upper computer control end 1, a handheld key control device 2, an electromagnetic valve 3, an injection pump 4, a dilution/titration liquid bottle 5, a stock solution bottle 6 and a plurality of collection bottles in a dilution mode. The upper computer control end 1 is connected with the communication ports of the electromagnetic valve 3 and the injection pump 4; the handheld key control device 2 is connected with the upper computer control end 1 and used for sending and receiving data and instructions; the injection pump 4 is connected with a first channel 31 of the electromagnetic valve, the dilution/titration liquid bottle 5 is connected with a second channel 32 of the electromagnetic valve, and a third channel 33 of the electromagnetic valve is connected with the raw liquid bottle 6. Before dilution, a plurality of groups of stock solution amounts, dilution ratios and dilution rates of diluted samples can be set at one time through the upper computer control end 1. When the instrument is initialized, the first channel 31 inside the electromagnetic valve 3 is communicated with the second channel 32, the outside is connected with the outlet of the injection pump 4, and the outside of the second channel 32 of the electromagnetic valve is connected with the dilution/titration liquid bottle 5. And (3) sucking the diluent with the same volume as that of the liquid discharge pipeline by the injection pump 4 through a liquid suction pipeline, switching the electromagnetic valve 3, and cleaning the liquid discharge pipeline through the injection pump 4 after the first channel 31 is communicated with the third channel 33. When the dilution is started after the dilution parameters are set, the first channel 31 and the third channel 33 of the electromagnetic valve 3 are firstly communicated, the injection pump 4 extracts the stock solution to be diluted with a set amount from the stock solution bottle 6 through the third channel 33 under the control of the handheld key control device, then the electromagnetic valve 3 is switched to the first channel 31 to be communicated with the second channel 32, and other channels are closed. The injection pump 4 sucks a certain amount of diluent from the dilution/titration liquid bottle 5 according to the set dilution times, and when the liquid discharge pipeline is transferred to the collection bottle 7 and is controlled by the hand-held key control device 2, the diluent enters the buffer pipeline through the third channel 33 of the electromagnetic valve and is discharged into the collection bottle 7 together with the stock solution to be mixed and diluted. The injection pump 4 can absorb the diluent and discharge into the collecting bottle 7 for a plurality of times according to the set dilution multiple in the dilution process so as to achieve the set dilution multiple and simultaneously play a cleaning role in the pipeline. After the dilution of the sample is completed, the next sample dilution is performed in the collection bottle 8 according to the set parameters under the control of the hand-held key control device 2.

Further, the handheld key control device of this application arranges diluent/titrate liquid outlet pipe end in to be equipped with correlation formula level sensor with the tube coupling department and be used for detecting whether the pipeline has liquid, can rectify the suction volume at every turn operation in-process through level sensor diluter/titrator. The handheld key control device is provided with a low-power-consumption Bluetooth module, is communicated with the main control board in a wireless connection mode, and is used for selecting functions and setting parameters of the system, and controlling basic operations such as starting, pausing, stopping, speed regulation and the like in the liquid adding and absorbing processes; after the operation is finished, the key controller can be placed at a specific position of the host for automatic charging.

In one embodiment of the present application, the titration modes and methods are summarized as follows:

as shown in fig. 2, the device comprises an upper computer control end 1, a handheld key control device 2, an electromagnetic valve 3, an injection pump 4, a titration liquid bottle 5 and a liquid bottle 6 to be titrated. The upper computer control end 1 is connected with the communication ports of the electromagnetic valve 3 and the injection pump 4, and the handheld key control device 2 is connected with the upper computer control end 1 and used for sending and receiving data and instructions. The injection pump 4 is connected with a first channel 31 of the electromagnetic valve 3, the titration liquid bottle 5 is connected with a second channel 32 of the electromagnetic valve 3, and the titration liquid bottle 6 is connected with a third channel 33 of the electromagnetic valve 3. Before titration, the titration liquid volume and titration rate of a titration sample can be set through the upper computer control end 1. When the instrument is initialized, the first channel 31 and the second channel 32 in the electromagnetic valve 3 are communicated, the diluent with the same volume as the liquid discharge pipeline in the titration liquid bottle 5 is sucked, and then the electromagnetic valve 3 is switched to the first channel 31 and the third channel 33 to be communicated to clean the liquid discharge pipeline. After the titration is started, under the control of the manual key controller 2, the first channel 31 and the second channel 32 of the electromagnetic valve 3 are communicated, the syringe pump sucks 3/4 measuring range titration liquid, and the titration is carried out in the liquid bottle 6 to be titrated under the control of the manual key controller 2. When the system presets the titration liquid volume and titration rate, the syringe pump discharges the ration and titrates solution according to certain speed, and the flowing back speed can be adjusted through manual button control ware 2 according to actual need in titration process, and host computer control end 1 real time monitoring is current titration liquid volume. When the titration liquid volume reaches the preset value of the system, the system stops titration, and the titration liquid volume can be continuously controlled through the hand-held key control device 2 so as to perform accurate titration at the end point or perform next sample titration through key control. When the system does not preset the titration liquid volume and the titration rate, the titration liquid volume can be freely controlled, and the upper computer control end 1 can record the titration liquid volume in real time.

In the implementation of the present application, as shown in fig. 3, the hand-held push-button control device 2 of the multifunctional dilution/titration apparatus includes a pipeline 21, a left liquid level sensor 22, a right liquid level sensor 28, a status indicator lamp 23, a first push-button 24, a second push-button 25 and a third push-button 26 connected thereto. During dilution or titration, the liquid pipeline is filled with liquid or imbibed liquid through a handheld key control device, wherein the state indicator lamp 23 can display the running state of the instrument, for example, the red normally-on state represents the standby state of the instrument, the red flicker represents the fault or unknown error of the instrument, the green color represents the normal running state, and the green flicker represents the pause state. In the operation process, the dilution or titration program is started through the second key 25, the increase and decrease of the operation speed are controlled through the first key 24 and the third key 26 in the operation state, the operation is controlled to be suspended and resumed through the second key 25, and the long-time pressing is stopped. Furthermore, the sequential samples are switched during the titration or dilution process by double-clicking the first button 24 and the third button 26. During correction, liquid in the pipeline connecting end 21 to the pipeline liquid suction and discharge end 27 is firstly drained, the liquid suction and discharge end 27 inserts liquid for liquid suction, the system stops liquid suction when the liquid level of the pipeline reaches the liquid level sensor 22 in a correction mode, and the liquid amount recorded by the control end is corrected to be the actual liquid suction amount from the liquid inlet end to the position of the liquid sensor 22. The running state of the system is displayed on the display screen of the upper computer control end 1 in real time in the control process, and the working efficiency is improved under the condition of sample operation flexibility through the cooperative control of the handheld key control device and the upper computer control end.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.