Yudian AI True Color Touch Screen Split-type Paperless Recorder in Sewage Treatment pH Monitoring Application I. Overview:
The quality of the sewage treatment, the pH value of the water is determined by the amount of dissolved matter, so the pH can sensitively indicate the change of water quality. The change of pH has a great influence on the reproduction and survival of the organism, and also seriously affects the biochemical action of the activated sludge, that is, affects the treatment effect. The pH value of the sewage is generally controlled between 6.5 and 7.
The long-term detection of water quality in wastewater treatment plants by the AI-2070C bus-type paperless recorder plays a vital role. The pH meter of the sewage treatment plant is installed in the outlet overflow tank of the oxidation ditch, and the water is chemically neutral. Some water molecules spontaneously decompose according to the following formula: H2O=H++OH-, which is decomposed into hydrogen ions and hydroxide ions. In a neutral solution, the concentration of hydrogen ion H+ and hydroxide ion OH- is 10-7 mol/l, and the pH value is the negative of the logarithm of the base of hydrogen ion concentration: pH=-log, so neutral The pH of the solution is equal to 7. If there is an excess of hydrogen ions, the pH is less than 7, and the solution is acidic; otherwise, if the hydroxide ions are excessive, the solution is alkaline.
The pH value is usually measured by a potentiometric method. Usually, a reference electrode and a measuring electrode of a constant potential are used to form a primary battery. The magnitude of the electromotive force of the primary battery depends on the concentration of hydrogen ions and also depends on the pH of the solution. A CPS11 pH sensor and a CPM151 pH transmitter are used. The measuring electrode has a special pH-sensitive glass probe. It is made of special glass that can conduct electricity and penetrate hydrogen ions. It has high measurement accuracy and good anti-interference. When the glass probe is in contact with hydrogen ions, a potential is generated. The potential was measured by a silver wire reference electrode suspended in a silver chloride solution. The pH value is different, and the corresponding potential is different. It is converted into a standard 4-20mA output by the transmitter.
The PH monitoring instrument generates a changing electrical signal by collecting the PH value of the drain pipe through the test pen, and analyzes and calculates the signal to convert it into a corresponding current signal output for the analog converter to collect. The PH measuring pen is connected to the AI ​​split paperless recorder and connected to the central computer room.
Second, the system is formed 1, the system architecture
As the upper computer monitoring computer, the analog module is continuously and continuously monitored by the company's existing network system, and the data is read and calculated, and finally the current signal collected by the PH meter is restored to the PH value. And display the PH value as a number, curve, etc., or generate a database to save.
The electrical box No. 1-5 shown in the figure below is installed on site. Each box is equipped with 6 PH sensor instruments and an analog acquisition module AI-706MFJ4J4J4S. Each analog acquisition module connects the RS485 communication bus signals of each box through a two-core cable to transmit the AI2070C true color touch screen paperless recorder. The RS485 penetrating paperless recorder connects the signal to the computer monitoring system that is ultimately connected to the office.
The paperless recorder acts as an intermediate medium to convert the current signal converted from the PH meter into a digital signal and store it in a certain physical address for transmission. Each meter has six 4-20MA signal read channels, each with its own physical address to store the value of the converted current signal. Moreover, each meter has a separate address (the address can be set by software) for the host computer to recognize and read.
3, paperless recorder function AI true color touch screen split paperless recorder, using the Yudian AI series module as a measurement and control input module to achieve multi-channel digital full-screen display. The measurement and control instrument not only includes various types of temperature, pressure, flow, frequency and other signals, but also includes artificial intelligence PID adjustment, flow calculation, power measurement and other functions, which can be configured as needed and combined in any combination. With icon-style function selection, all Chinese touch operation, easy to operate, easy to learn. The touch screen can be added to the flow chart, customized to provide a colorful process flow chart, can be connected to PLC, inverter and other equipment for terminal display of small DCS control system. The function has surpassed the general paperless recorder, integrating the functions of man-machine interface and paperless recorder;
The external storage standard 2GU disk storage record; data storage according to the principle of first-in-first-out, the data point is saved immediately; the data is directly opened on the PC to read the data;
Adopting the structure of the upper computer + lower computer, that is, the ready-to-use RS485 communication line can be used; the touch screen and the measurement and control instrument can be purchased separately and can be freely expanded, and the measurement and control instrument not only includes various temperature, pressure, flow, frequency and other signals, but also Including artificial intelligence PID adjustment, flow calculation, power measurement and other functions, can be configured as needed, any combination. The input and output specifications are extremely rich, and you can choose one-way or multi-channel display alarm, intelligent regulator, handheld communicator, flow totalizer or digital input and output module; each recorder can choose 1, 2, 4, 6, 8, 12, 16, 18, 22, 32 channel type software; free editing to select the AI ​​channel hardware model; writeable device bit number such as: [TIC-101]; measurement unit [°C];
Widely used in chemical, metallurgy, petroleum, pharmaceutical, food, electric furnace, constant temperature and humidity chamber, mechanical equipment "target=_blank> mechanical equipment, laboratory mobile control screen, small DCS control system, etc. as a terminal display to use Optional touch screen power can be connected to the machine.
AI true color touch screen split type paperless recorder adopts upper computer (touch screen) and lower computer (AI instrument) bus connection, arranged by address, AI meters operate independently of each other, do not interfere with each other, and can display operation when energized; each recorder It can choose 1~32 sets of adjustment and display instruments; it can connect 4 sets of AI-808H temperature and pressure compensation flow meter; 1 set of 601 power meter. Connect one AI-3013D5 module, 8 switch output control motor start and stop; connect one AI-3011D5 module, 8 switch inputs show motor running state; touch screen COM1 communication port adopts [Super 5 shielded twisted pair] 2 The root line is connected to the communication port A/B end RS485 communication of the AI ​​meter; the other wires cannot be connected in the middle; the switching power supply is supplied with DC 24VDC power supply, the power line +, - two lines, and the ground line. The COM2 communication port has a random print function.
The AI ​​true color touch screen split type paperless recorder adopts the disk surface mounting mode, the AI ​​instrument adopts the disk surface or the rail mounting mode; the communication line adopts the [Super Category 5 shielded twisted pair cable], and the 24VDC switching power supply is installed. Boot into the icon-type function selection screen; [Home] displays the icon [Adjustment Instrument], [Flow Meter] [Power Meter], [Alarm Record], [Bar Graph], [Flowchart], [Report], [Data Export] 】, [single curve] [real-time curve], [history curve], [setting], click to enter the function screen;
AI true color touch screen split type paperless recorder application [Home] select [Adjustment meter] full screen display; select [single curve] to display a single curve, point [SV] to set the meter setting value; point [MV] manual output amount Set; point [Auto/Manual] hand automatic switching, program control, program recipe setting, view curve; in [Bar Graph], [Real Time Curve], [Historical Curve], [Flowchart] Click: Data frame of the screen can be Quickly return to the [single curve] channel of a single meter. Press [Previous] [Next] on the same page;
The real-time and historical combination multi-trend curves are fixedly combined in the [real-time curve] [history curve] in the order of the channels 1, 2, 3, 4, and 6 to visually display the relationship between the relevant channels. Click [Data Frame] to return to the [Live Screen] channel. Click [S] on the [History Curve] screen to select a single or four curves to display the trend change; set the query start time and time span; different data range enables a single query. The combination channel is switched by [Previous] and [Next].
View the process of changing the PH value during the sewage treatment process, and issue alarm signals in a timely manner to start and add operations.
In the process flow chart interface, you can see the vivid graphic picture to describe the on-site production process, which is the epitome of the entire industrial site. Intuitive display of real-time data from industrial sites, giving operators a very intuitive remote control.
Remote computer monitoring realizes synchronous data transmission through Ethernet function. The upper computer monitoring software directly accesses the instrument connected by AI true color touch screen split type paperless recorder through AI true color touch screen split paperless recorder, and must use AI. True color touch screen split type paperless recorder application data synchronization, upload computer monitoring function, the function of this function: is to use AI true color touch screen split paperless recorder as a similar channel of the transfer station, the host computer software is sent to the instrument The instructions need to be forwarded to the meter through the AI ​​true color touch screen split type paperless recorder. In addition, the data returned by the meter is sent to the host computer software via the AI ​​true color touch screen split type paperless recorder.
The system is a software product that needs to be redeveloped by Yu Electric Control Configuration Special Software. It can be used directly after system configuration. The software and AI instrument are used together to form an AIFCS fieldbus computer monitoring system.
The AI ​​instrument is installed on the industrial site, and the RS485 bus is used to connect the control layer computer, and the instrument is operated on the control layer computer. All control functions and data information are managed and distributed on the control room computer. On the computer, the workshop control instrument is monitored in all aspects, data acquisition and processing of various transactions.
Software Structure The internal structure of the software can be divided into the following three parts:
Data acquisition and real-time control, data processing, authority management 1. Data acquisition and control: The software system collects measured values ​​from the industrial field temperature controller and edits the real-time curve. It can display 8 real-time curves at the same time and distinguish them by color. The curve shows two graphs of the optional percentage and the real-time curve. Other curves can also be masked to show a single curve. Real-time data presented and stored in the system database for future data query and other use. On the flow chart, real-time trend chart or instrument screen:
2. Platform operation: Click [meter display box] to appear the operation platform: you can see the name of the AI ​​meter definition control device, bit number, instrument model, address, range upper limit, lower limit limit, measurement unit, AI instrument at this time All display parameters and control buttons are displayed on the platform. The flow chart control motor is controlled by switch mode, and is controlled by [on/off] on the same contact. If you click [Parameter] name to modify [upper limit absolute value alarm value HAL] fill in the parameters in the dialog box, click "OK" parameters to pass to the on-site AI instrument temperature regulator,
3. Data processing: extract data from the historical database and complete the specified processing functions. Includes historical data display and historical curve drawing.
4, automatically generate various types of data reports, alarm reports, generate alarm events prompts have an audio reminder. Historical alarms, reports by list line, all kinds of reports can be exported to the software to save in the form of Microsoft Excel documents or browsers. Report query: Enter the start and end time period to query historical data;
5. Run the record report. Record each operation record for future reference.
6. Industrial site: Install a computer in the control room and use the shielded super five-type four-pair twisted pair network cable to use RS485 as the AI ​​instrument to connect to the field communication bus. The configured AIFCS network version monitoring software is installed on the computer, and the field controller is 100% functionally operated on the computer with a simple and reliable self-contained communication protocol. Read the measured value in real time and modify the control parameters at any time.
Meter function table: Fill in the measurement point function table for making software.
Third, PH sensor installation and maintenance 1, pH meter installation and maintenance
The pH meter is installed in both flow-through and immersion versions. The sewage treatment plant generally chooses immersion installation. For example, the pH meter of the sewage treatment plant is installed in the outlet overflow tank of the oxidation ditch. The pH value here is representative and the water flow is stable, which will not cause the pH meter. Big impact.
Regular maintenance helps to accurately measure the meter and extend the life of the meter. It should be noted that the dedicated cable between the sensor and the transmitter should not be wet, otherwise the high impedance low voltage signal of the electrode will not be transmitted to the transmitter. If the electrode is not measured, the yellow protective sleeve should be put on, which can make the electrode wet, which is beneficial to prolong the service life of the electrode. Every other month or so, the electrode should be cleaned. Spray the attached material with a gentle water flow, then immerse the electrode in the cleaning solution for a while, then rinse it with water. The sensor bracket should also be cleaned. After each cleaning, the buffer solution should be used for calibration. At the current domestic pH calibration solution, pH=4 is OK, and pH=7 is not accurate enough, which will affect the calibration result. Therefore, it is best to use the manufacturer's calibration solution. The manufacturer generally provides two standard solutions. One bottle has a pH equal to 7 and is used to calibrate the zero point of the meter. A bottle with a pH equal to 4 is used to calibrate the signal output slope of the meter. The system is mainly composed of metal probe, electronic detection unit, microcomputer display and adjustment unit, execution unit, and electric machine "target=_blank> machine power supply.
The device is based on the conductive properties of the electrolyte and the non-electrolyte. The electrolyte and non-electrolyte sensor composed of the metal probe and the electronic detecting unit detect the conductivity of the water tank, and send the generated signal to the microcomputer display and adjustment unit to compare with the set value. . If the displayed value (measured value) < set value, the unit will send a signal to the execution unit, and the execution unit will add the dampening solution to the water tank through the dosing pump; if the display value ≥ the set value, the unit will stop executing. Command to stop the moisturizing solution. In addition, the device can also cyclically and reciprocally control the pH value within the set range according to the actual situation of the pH value of the dampening solution, so as to achieve the purpose of automatically detecting and adjusting the pH value of the dampening solution, and the precision is very high.
With the increasing emphasis on water resources protection in China, the purification treatment of sewage is becoming more and more important, and the detection instruments required for the matching process are indispensable. As the most important instrument in the wastewater treatment industry, water quality analyzers are also important for regular maintenance and calibration, in addition to proper selection and installation, and are the key to making the instrument work.
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