CN108802314A - A kind of water quality monitor on-the-spot automatic verification system - Google Patents
A kind of water quality monitor on-the-spot automatic verification system Download PDFInfo
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- CN108802314A CN108802314A CN201810567599.5A CN201810567599A CN108802314A CN 108802314 A CN108802314 A CN 108802314A CN 201810567599 A CN201810567599 A CN 201810567599A CN 108802314 A CN108802314 A CN 108802314A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
Abstract
The present invention provides a kind of water quality monitor on-the-spot automatic verification system, including water quality monitor on-the-spot automatic verification platform, automatic sampling device, automatic dilution device three parts；This system unifies examination criteria, promotes automation detect to such measurement instrument, the level of IT application, greatly improves gauge check working efficiency, promoted and detect work quality；The competency profiling to testing staff is reduced, testing staff's labor intensity is mitigated, detection is reduced and is consumed with reagent, the quality risk that reduction scene is brought with liquid and detection work by hand preferably meets the general inspection work of such measurement instrument and carries out；Have many advantages, such as that wide adaptation range, intelligent height, overall efficiency are high, can preferably meet prior art code requirement, may extend to national each province and city measurement technology mechanism.
Description
Technical field
The invention belongs to environment supervision instrument metrological standard unit fields, and in particular to a kind of water quality monitor scene is automatic
Verification system.
Background technology
With the development of environmental monitoring technology, on-line monitoring has become the important component of environmental monitoring.In recent years, I
State has put into many water quality on-line monitoring instrument device equipment, has set up by the monitoring water quality on line net of environmental protection administration's joint construction and management at different levels
Network.Environmental protection administration's related data shows, China nearly 100,000 sets of water quality monitor/analyzer, be related to COD,
Nitrogen nitrogen, permanganate index, total phosphorus, total nitrogen, cadmium, copper, zinc, lead, Cr VI, total chromium, manganese, cobalt, nickel, volatile phenol, fluoride etc.
Nearly 30 kinds of monitoring parameters are mainly used for monitoring surface water, emphasis river basins section and Wastewater floss hole monitoring station,
Wherein, COD, nitrogen nitrogen accounting highest.Although the quasi-instrument belongs to state compulsion calibrating measurement instrument, monitoring data mostly
As government decision foundation, some are announced to the public, and prior art specification is also relatively sound, but examination rate is still below at present
10%, even less than 2%, monitoring data magnitude is general lack of tracing to the source, therefore comparison property is poor, the quality that environmental monitoring and improvement face
It is very risky and uncontrollable.
China's Water Automatic Monitoring System point quantity is more, and surface water is distributed in the basin section of cities and counties of province boundary, place mostly
Dispersion, station management rely primarily on O&M unit, and to station management, instrument controlling, there are strict requirements for environmental protection administration, is so limited,
Metrological service's development gauge check, which is operated under existing management system, cannot achieve remote auto detection.Due to lacking related mark
Standard, most of stations lack the analyses water water making devices such as water purification machine, prepare solution and need the glass such as volumetric flask, the pipette used
Glass vessel are not traced to the source or are not matched, and diluted on site standard solution condition may not have or quality cannot be guaranteed.
Currently, carry out is to the Main of automatic water quality monitoring instrument：Liquid is matched at testing person scene, and setting is joined by test examination instrument
Number, is examined and determine item by item by demand of technical standard, since each parametric instrument method is not quite similar, run time difference, this
Requirements at the higher level are proposed to testing person's scientific arrangement time, and need to record and analyze mass data, scene judges verification result,
And live confirmation is carried out to overproof result.As can be seen that there are labor intensity is big, time-consuming, standard liquid consumption for this working method
Measure the problems such as big.
The general inspection work of water quality on-line monitoring instrument is also the main trend of national environmental protection, the automatic Verification dress of water quality on-line monitoring instrument
Standby is also the inevitable choice developed under new situation.Currently, automatic water quality monitoring instrument metrological standard unit lacks, and manually matches liquid efficiency
Low, live influence factor is on the high side, examines and determine the deficiencies such as time-consuming and working efficiency is low, cannot be satisfied current monitoring water quality on line at all
The Measurement Verification Work reality of instrument needs, and there is an urgent need to improve calibration operation efficiency, promotes national Measurement Verification Work standardization
Level, meet new round water quality on-line monitoring instrument device it is general inspection everything goes well with your work implement.
Invention content
In view of the above-mentioned problems, the present invention provides a kind of water quality monitor on-the-spot automatic verification system, it is used for surface water, again
It puts the Water Automatic Monitoring Systems point devices such as basin, optimized treatment and carries out one-touch, intelligent automatic validation program, it can be with oneself
Dynamic sampler or automatic dilution device are connected, can be in the two kinds of common situations in laboratory or diluted on site aimed concn standard liquid
Under, realize the automatic standard solution for extracting the various concentration needed for validation program project, and realization is automatic clear between disparity items
It washes, ensures the accuracy of testing result, reduce the uncertainty brought by cross contamination.
Technical scheme is as follows：A kind of water quality monitor on-the-spot automatic verification system, including water quality monitor are existing
Field automatic Verification platform, automatic sampling device, automatic dilution device three parts；
Water quality monitor on-the-spot automatic verification stage+module is in the style interfaces such as band RS485, RS232, Modbus, Modbus TCP
Computer on；
This system further includes that built-in GPRS communication modules are connected with mobile radio communication, and mobile radio communication connects with internet wireless
It connects；
The automatic Verification platform is connected separately with Database Systems, dilution device communication module, instrument communication module, system UI
Control module, input-output equipment, RS485 and RS232 interface, TCP interfaces；
The automatic Verification platform uses 485 communication interfaces Dynamic link library instrument in a manner of loading DLL instruments library；
The automatic Verification platform starting step is as follows：
Initialize systematic parameter；
Create verification task；
Increasing load test parameter loads measuring parameter；
Calibrating project is analyzed, calibrating control code is generated, generates calibrating control sequence；
Loading equipemtn controls library；
Start to examine and determine；
Refresh calibrating progress in real time, gradually starts verifying process flow according to calibrating control sequence, refresh verification result in real time；
Abnormal interrupt or calibrating are completed to judge；
Data preserve if examining and determine completion, if calibrating, which does not complete, returns to beginning verification step；
The verifying process flow of the present invention is as follows：
Specified mother liquid concentration, specified wash number n times；
Cleaning step includes：Open peristaltic pump；Open air pump, stirring and washing；Waste water is discharged；
Waste water is discharged after the completion of cleaning；
Peristaltic pump starts plus water；
Titration pump starts to titrate according to prescribed concentration；
Air pump is opened, and starts to stir；
Stand 30s；
Cleaning is completed with liquid；
Automatic Verification platform completes the control of automatic dilution device and instrument, data acquisition, coordinates the work of 2 kinds of equipment, to adopting
The data of collection are analyzed, calculated and are stored
The course of work of the present invention is as follows：
1, Job readiness is detected：Water quality monitor automatic verification system and matched reagent are transported to tested monitoring station.
2, equipment connects：By testing staff or it is familiar with by the operation maintenance personnel of test examination instrument in the case where testing staff instructs, by concentration
Horizontal order from low to high places calibrating standard solution in automatic sampling device, or a certain concentration standard solution mother liquor is put
In automatic dilution device mother liquor lay down location.Then, tested water quality monitor, automatic sampling device or automatic dilution device are connected
Connection and sample delivery pipeline.
3, system starts：The computer of installation water quality monitor automatic Verification software is opened by testing staff, is started shown in Fig. 2
Automatic Verification program.
4, connection is established：It is established and is connected by communications protocol, if do not connected with tested water quality monitor between system
Good, system can prompt no successful connection, check connection line.If it is the instrument not having in communications protocol library, system can carry
Show addition agreement.According to the protocol contents to be established, critical parameter information is filled in, communications protocol is generated according to the information of offer,
It is incorporated into system communication protocol library.After, the instrument of system meeting this kind of producer's model of automatic identification.
5, setting initialization systematic parameter：It is filled in systems by system prompt guiding function according to calibration operation content
Examine and determine organization, the basic informations such as contact person, metrological standard unit, equipment etc. are traced to the source information and instrument title, factory
Family, model, detection parameters, measurement range, the technical specification of use, detection project, testing process, detectable concentration, pendulous frequency,
Interval time etc..If dilution, cleaning analysis water are also needed to using automatic dilution device, before use, in dilution device circle
After the completion of starting cleaning on face, then mother liquid concentration, aimed concn information are set.
6, verification task is created：Technical specification that system is filled according to system, measurement range, detection project, testing process,
The information such as detectable concentration, pendulous frequency, interval time create verification task, automatic increasing load test parameter and measuring parameter, including
Detection liquid concentration, qualification determination requirement etc., generate calibrating control code, generate calibrating and examine and determine control sequence.
7, loading equipemtn controls library：Load
8, calibration operation starts：If using dilution device, system can first start dilution device and be diluted action.It is to be diluted complete
It is molten by the sample feeding pipe connected to extract calibrating standard by tested automatic water quality monitoring instrument from dilution device probe tube by Cheng Hou
Liquid is implemented to examine and determine one by one by the calibrating project flow confirmed is generated.
9, data store：All test datas are automatically saved in by system in network data base.
10, abnormal interrupt：There are multiple methods for judging exception and processing exception in system operation, ensures to test as far as possible
Journey it is reliable and stable.
11, data processing：Data processing and calculating process are carried out in strict accordance with existing assay calibration authority file, and can
With automatic screening in systems.
12, calibrating is completed：After the completion of calibrating, data automatically save, and automatic result of calculation.
13, original record is generated：User can automatically generate the inspection of needs by opening historical record function after the completion of calibrating
Determine original record.
Beneficial effects of the present invention are as follows：
Unified examination criteria promotes the automation detected to such measurement instrument, the level of IT application, greatly improves gauge check work
Make efficiency, promotes detection work quality.
The competency profiling to testing staff is reduced, testing staff's labor intensity is mitigated, detection is reduced and is consumed with reagent, reduced
The live quality risk brought by hand with liquid and detection work, preferably meets the general inspection work of such measurement instrument and carries out.
The device has many advantages, such as that wide adaptation range, intelligent height, overall efficiency are high, can preferably meet prior art rule
Model requirement, may extend to national each province and city measurement technology mechanism.
Description of the drawings
Fig. 1 is the functional block diagram of this present invention
Fig. 2 is the verifying process flow figure of the present invention
Fig. 3 is automatic water quality monitoring instrument automatic calibrator structural schematic diagram
Fig. 4 is the communication connection diagram of water quality monitor and automatic water quality monitoring instrument automatic calibrator
Fig. 5 is the management connection diagram of water quality monitor and automatic water quality monitoring instrument automatic calibrator
Fig. 6 is communication protocol standard structure chart
Fig. 7 is automatic sampling device, automatic water quality monitoring instrument automatic Verification software platform connection diagram
Fig. 8 is automatic dilution device, automatic water quality monitoring instrument automatic Verification software platform connection diagram
Fig. 9 is automatic Verification platform Booting sequence figure
Specific implementation mode
Specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, as shown, the water quality prison of the present invention
Survey instrument on-the-spot automatic verification system, including water quality monitor on-the-spot automatic verification platform, automatic sampling device, automatic dilution device
Three parts；Water quality monitor on-the-spot automatic verification stage+module is in the types such as band RS485, RS232, Modbus, Modbus TCP
On the computer of interface；
This system further includes that built-in GPRS communication modules are connected with mobile radio communication, and mobile radio communication connects with internet wireless
It connects；The automatic Verification platform is connected separately with Database Systems, dilution device communication module, instrument communication module, system UI
Control module, input-output equipment, RS485 and RS232 interface, TCP interfaces；The automatic Verification platform is connect using 485 communications
Mouth Dynamic link library instrument in a manner of loading DLL instruments library；
The automatic verification system platform of the present invention completes the control of automatic dilution device and instrument, data acquisition, coordinates 2 kinds of equipment
Work, the data of acquisition are analyzed, calculated and are stored；
Automatic Verification platform software is according to tested water quality monitor parameter and applicable country or regional technology specification, with heavy metal
For water quality online analyzer, by the calibrating standard requirement of JJF 1565-2016 countries, automatically generate including detection limit, indicating value mistake
Difference, the acquiescence of repeatability, stability, memory effect detect agenda, and testing staff can be according to actual conditions and requirement to school
Quasi- project is deleted, i.e., the calibration item executed required for only doing.
This system meets the legal technical specification of country and the daily calibrating/school of measurement technology mechanism of all existing approval publications
Standard/detection need of work realizes that intelligent automatic detection, testing result judge that original record automatically generates automatically, testing person
It can remotely check detection progress, if any exception, notify testing staff at the first time, meanwhile, system can be by the exception being pre-designed
Treatment mechanism is disposed.
Automatic Verification program software can be detected program and mainly abided by by technical specification and its calibrating/calibration/detection project requirement
From following principle：（1）Detection program is ranked up by detection with concentration of standard solution from low to high（Heavy metal water quality monitor
Except memory effect project）, reduce because of uncertainty caused by cross contamination, pipeline-cleaning number, water for cleaning and cleaning
Time.（2）The project of used same concentrations standard solution, which synchronizes, in technical specification arranges, and reduces target solution waste, cleaning
With water, used time, the cross contamination that may be brought repeatedly by high-concentration and low-concentration is reduced.
The situation that completion has been prepared for target criteria solution, before detection, by water quality monitor on-the-spot automatic verification software
Platform is connect with tested water quality monitor, automatic sampling device by RS485/RS232 respectively, and every tested water quality monitor connects
An automatic sampling device is connect, each platform can at most be connected with three tested water quality monitors.
Producer of the automatic Verification software according to the tested water quality monitor of input, model, find this from protocol library automatically
Producer, model instrument communications protocol, if there is target protocol, you can establish connection.If producer's instrument communication agreement is still
Not in protocol library, after the communication identification code required by the keyword provided according to producer technical staff is provided under normal conditions, compile
It writes in target communication agreement to target protocol library, detection work can be carried out.
For needing the situation of live automatic dilution, before detection, water quality monitor on-the-spot automatic verification software platform difference
It is connect by RSRS485/232 with tested water quality monitor, automatic dilution device, every tested water quality monitor connects one certainly
Dynamic dilution device, each platform can at most be connected with three tested water quality monitors.
The automatic sampling device is for realizing tested water quality monitor to the target criteria solution needed for detection project
Sample introduction is carried out, target solution should be sequentially placed in automatic sampling device by solution concentration level, be needed in principle in software
The solution concentration placed each target position position is respectively set according to the case where placement on platform, due to automatic Verification program software
According to National Technical specification provide needed for the concentration level of standard solution, type, quantity, handled by program optimization, if
By concentration level, order is placed from low to high, you can without making this setting on software platform.
The automatic dilution device is a kind of target solution concentration needed for detection project, to a certain concentration range
（10~1000 times）Constant volume is carried out with the mother liquor of volume（Model machine 250mL may customize）Dilution, substitution traditional-handwork dilution, dilution
Solution storage is in constant volume bottle afterwards, for use.Pass through attachment device standard solution probe tube and tested water quality monitor sample feeding pipe, quilt
The sample introduction of target solution can be realized in inspection water quality monitor, and the standard solution needed for validation program is provided for tested water quality monitor
Source.Automatic dilution device is combined in particular order by devices such as each valve of bottom hardware drive control, pipelines to reach
It to purpose of the cleaning with liquid, and is communicated by communication module and automatic calibrator, automatic calibrator passes through Modbus
Transmission Control Protocol realizes the remote control to dilution device.
The automatic verification system is the core of verification process control, passes through RS232, RS485 or TCP mode and dilution
Device and tested instrument communication, acquire measurement data, and calculate verification result automatically according to verifying process flow, result data is stored in
In database.
The software of the automatic verification system is by state modulator, control code management, verifying process flow management, device talk pipe
The eight big modules such as reason, data shows, user's input/output, data processing, data storage form.Verifying process flow management module and
Device talk module is the core of entire automatic calibrator.The module will be according to corresponding vertification regulation to all calibratings
Efficient verification step is planned and is automatically generated in project centralized management.
Data processing module：The data of acquisition are calculated automatically, according to vertification regulation automatic decision result.
Data memory module：The information such as data, result of calculation, verification parameters to acquisition carry out storage management.
Parameter control module：To in verification process verification parameters and the data such as measuring parameter manage concentratedly.
Control code management module：Control code is the communication operation command id to equipment, which unites to these marks
One encapsulation.
Verifying process flow management：Some operations of the project and equipment of flexible setting calibrating, are control code management modules
Upper layer.
Device talk module：Be with the channel of equipment " exchange ", use RS485 modes.
Data disaply moudle：Display detection progress and detection data in real time.
User's input/output module：For providing a variety of interactions such as touch screen, physical keyboard, software digital keyboard, mouse
Means.
Information management layer includes device pool management, measuring parameter management, detection parameters management, calibrating project management, standard
Device data inputting, standard set-up data inputting, the inquiry of historical data.It is mainly used for producing in data and verification process to acquisition
Raw result will be preserved and be managed.
The exception handling of the automatic verification system includes to communication connection, scarce detection liquid, detection exceptional value etc.
The abnormal conditions being likely to occur are handled.Processing especially to detecting exceptional value, because of detection project, detection parameters, detection
Number etc. is different variant.
The testing process of the automatic verification system, is adjusted flexibly verification step, greatly improves calibration operation efficiency.（1）
According to relevant art regulation, identical calibrating project is but a variety of due to being partly related in general in same primary calibrating sequence
The standard solution of concentration, such as error of indication, if strictly designing verifying process flow by regulation sequences of text, it will cause dilution devices
Anti- compositional liquor, standard solution do not make full use of, and extend the calibrating time, waste chemical reagent, return " the secondary dirt that environment is brought
Dye ".By design optimization calibration operation flow, the flexibility of detection working procedure establishment is improved, the function is according to current assay
Project needs to optimize calibrating sequence from low to high, both calibrating time, resource, cost is substantially reduced, moreover it is possible to as far as possible
It reduces due to concentration error caused by configuration process repeatedly.（2）It is operated using the construction treatment equipment of layering, each layer task is opposite
It is independent so that verification process management module only needs the control of concern calibrating logic and casts aside equipment operation part.Equally, low layer
Secondary device talk also only needs to pay close attention to specific equipment operation order, and command wrapper is supplied at the functional block of unified format
High-level module uses.And equipment operation code layer is then the top bridge between lowermost layer.So design was being debugged
The operation logic that can avoid high low layer in journey is chaotic so that flexibly configures verifying process flow, step becomes simple apparent.
The communications protocol library of the automatic verification system and foundation：
The communications protocol cross-species transferability of the automatic verification system, for different manufacturers instrument or same producer's different model instrument
Between device, communications protocol difference is very big, much depends on monitor development system version, causing can not by the Communication Control of test examination instrument
It realizes unified standardization, seriously affects the adaptability of system in actual use, cause development difficulty to increase, program flexibility
It reduces.It is issued if often increasing a kind of instrument and being required for recompilating system, the device later maintenance and upgrading difficulty
It all will be very big.This system by the way of communication separation and dynamic load, by the feature operation of the instrument in need used return
Unified standardized software structure is received into, as shown in Figure 6.Each different instrument is all written as independent library file,
Different library files functional interface having the same, the corresponding instrumentation of library information acquisition that main system is bound by instrument
Library, by the way of dynamic load library.Library file and the main system relatively independent expansion module as instrumentation in logic, very
Good solves communications protocol different problems, and for maintenance in the future, extension provides excellent basis.
The course of work of the present invention is as follows（By taking COD water quality monitor as an example）：
1, Job readiness is detected：Water quality monitor automatic verification system and matched reagent are transported to tested monitoring station.
2, equipment connects：By testing staff or it is familiar with by the operation maintenance personnel of test examination instrument in the case where testing staff instructs, by concentration
Horizontal order from low to high places calibrating standard solution in automatic sampling device, or a certain concentration standard solution mother liquor is put
In automatic dilution device mother liquor lay down location.Then, tested water quality monitor, automatic sampling device or automatic dilution device are connected
Connection and sample delivery pipeline.
3, system starts：The computer of installation water quality monitor automatic Verification software is opened by testing staff, is started shown in Fig. 2
Automatic Verification program.
4, connection is established：It is established and is connected by communications protocol, if do not connected with tested water quality monitor between system
Good, system can prompt no successful connection, check connection line.If it is the instrument not having in communications protocol library, system can carry
Show addition agreement.According to the protocol contents to be established, critical parameter information is filled in, communications protocol is generated according to the information of offer,
It is incorporated into system communication protocol library.After, the instrument of system meeting this kind of producer's model of automatic identification.
5, setting initialization systematic parameter：It is filled in systems by system prompt guiding function according to calibration operation content
Examine and determine organization, the basic informations such as contact person, metrological standard unit, equipment etc. are traced to the source information and instrument title, factory
Family, model, detection parameters, measurement range, the technical specification of use, detection project, testing process, detectable concentration, pendulous frequency,
Interval time etc..If dilution, cleaning analysis water are also needed to using automatic dilution device, before use, in dilution device circle
After the completion of starting cleaning on face, then mother liquid concentration, aimed concn information are set.
6, verification task is created：Technical specification that system is filled according to system, measurement range, detection project, testing process,
The information such as detectable concentration, pendulous frequency, interval time create verification task, automatic increasing load test parameter and measuring parameter, including
Detection liquid concentration, qualification determination requirement etc., generate calibrating control code, generate calibrating and examine and determine control sequence.
7, loading equipemtn controls library：Load
8, calibration operation starts：If using dilution device, system can first start dilution device and be diluted action.It is to be diluted complete
It is molten by the sample feeding pipe connected to extract calibrating standard by tested automatic water quality monitoring instrument from dilution device probe tube by Cheng Hou
Liquid is implemented to examine and determine one by one by the calibrating project flow confirmed is generated.
9, data store：All test datas are automatically saved in by system in network data base.
10, abnormal interrupt：There are multiple methods for judging exception and processing exception in system operation, ensures to test as far as possible
Journey it is reliable and stable.
11, data processing：Data processing and calculating process are carried out in strict accordance with existing assay calibration authority file, and can
With automatic screening in systems.
12, calibrating is completed：After the completion of calibrating, data automatically save, and automatic result of calculation.
13, original record is generated：User can automatically generate the inspection of needs by opening historical record function after the completion of calibrating
Determine original record.
It is that illustrative description has been carried out to the present invention above, it is clear that realization of the invention is not limited by aforesaid way
System, if the various improvement of technical solution of the present invention progress are used, or it is not improved by the design of the present invention and technical solution
Other occasions are directly applied to, are within the scope of the invention.
Claims (3)
1. a kind of water quality monitor on-the-spot automatic verification system, which is characterized in that flat including water quality monitor on-the-spot automatic verification
Platform, automatic sampling device, automatic dilution device three parts；
Water quality monitor on-the-spot automatic verification stage+module is in the calculating with RS485, RS232, Modbus, Modbus TCP interface
On machine；
This system further includes that built-in GPRS communication modules are connected with mobile radio communication, and mobile radio communication connects with internet wireless
It connects；
The automatic Verification platform is connected separately with Database Systems, dilution device communication module, instrument communication module, system UI
Control module, input-output equipment, RS485 and RS232 interface, TCP interfaces；
The automatic Verification platform uses 485 communication interfaces Dynamic link library instrument in a manner of loading DLL instruments library.
2. a kind of water quality monitor on-the-spot automatic verification system according to claim 1, which is characterized in that
The automatic Verification platform starting step is as follows：
Initialize systematic parameter；
Create verification task；
Increasing load test parameter loads measuring parameter；
Calibrating project is analyzed, calibrating control code is generated, generates calibrating control sequence；
Loading equipemtn controls library；
Start to examine and determine；
Refresh calibrating progress in real time, gradually starts verifying process flow according to calibrating control sequence, refresh verification result in real time；
Abnormal interrupt or calibrating are completed to judge；
Data preserve if examining and determine completion, if calibrating, which does not complete, returns to beginning verification step.
3. a kind of water quality monitor on-the-spot automatic verification system according to claim 1, which is characterized in that verifying process flow is such as
Under：
Specified mother liquid concentration, specified wash number n times；
Cleaning step includes：Open peristaltic pump；Open air pump, stirring and washing；Waste water is discharged；
Waste water is discharged after the completion of cleaning；
Peristaltic pump starts plus water；
Titration pump starts to titrate according to prescribed concentration；
Air pump is opened, and starts to stir；
Stand 30s；
Cleaning is completed with liquid.
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| WO2020233516A1 (en) * | 2019-05-17 | 2020-11-26 | Xiang Yougang | Measuring instrument mass transfer/traceability method and measuring instrument management system |
| CN110987584A (en) * | 2019-11-25 | 2020-04-10 | 湖南省计量检测研究院 | Solution dilution method and system |
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Application publication date: 20181113 |