CN103499938A - Control system applied to NH3-N water quality online automatic monitor - Google Patents
Control system applied to NH3-N water quality online automatic monitor Download PDFInfo
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- CN103499938A CN103499938A CN201310454550.6A CN201310454550A CN103499938A CN 103499938 A CN103499938 A CN 103499938A CN 201310454550 A CN201310454550 A CN 201310454550A CN 103499938 A CN103499938 A CN 103499938A
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Abstract
The invention relates to a control system applied to an NH3-N water quality online automatic monitor. The control system applied to the NH3-N water quality online automatic monitor comprises a multipath input program control integrated operational amplifier, an analog-digital converter, a microprocessor, a digital-analog converter and a multipath control relay, wherein the multipath input program control integrated operational amplifier is used for receiving detection signals sent by the outside; the analog-digital converter is used for carrying out analog to digital conversion on the outside signals; the microprocessor is used for processing digital signals sent by the analog-digital converter, sending processed light intensity value feedback signals to the digital-analog converter, converting processed photoelectric signals into NH3-N signal values which are outputted by an output module, and sending processed other command signals to the multipath control relay; the digital-analog converter is used for carrying out digital to analog conversion on the light intensity value feedback signals sent by the microprocessor, and outputting converted analog signals; the multipath control relay is used for receiving the other command signals sent by the microprocessor and carrying out corresponding control on an external device. According to the control system applied to the NH3-N water quality online automatic monitor, which is disclosed by the invention, the online automatic monitoring to the pollution of water quality and the remote control on instruments can be realized, and the operating performance of the system is stable.
Description
Technical field
The present invention relates to ammonia nitrogen (NH in a kind of water resource
3-N) water quality online auto monitoring equipment, be specifically related to a kind of automatic control system of this on-line monitoring equipment.
Background technology
Along with the continuous increase of population in the world, the continuous progress of society, the acceleration of urbanization process, the fast development of work, agricultural, produced a large amount of pollutants, and environment especially water resource has been caused to serious destruction.At present, the whole world approximately has the sewage of billion cubic meter more than 4200 to enter rivers,lakes and seas every year, has the fresh water of general 5.5 tcms to be subject to pollution, and this is equivalent to more than 14% of global runoff volume.
At present, the major pollutants of China's water environment are ammonia nitrogen (NH
3-N), NH
3-N value is higher, illustrates that the pollution level of water quality is more serious.Therefore, water resource is monitored, particularly ammonia nitrogen (the NH in water body
3-N) monitoring of content, more and more come into one's own.
The measuring method of national standard HJ535-2009 " the mensuration nessler reagent spectrophotometric method of Water quality ammonia nitrogen " defined is the examination criteria for laboratory nessler reagent method.The laboratory all operations were all needs manually to carry out, and can't meet the monitoring requirement at all.And, existing domestic NH
3-N water quality online auto monitoring equipment fluctuation of service, do not have tele-control system, for water environment on-line monitoring and data acquisition contrast makes troubles.National environmental protection section once organized the countermeasure of Chinese the year two thousand twenty environment protection strategy, and industry and the sanitary wastewater prevention and cure of pollution of more than ten years have from now on been proposed to new demand.For adapting to this demand, carry out the online auto monitoring research of contamination index in water, there is far reaching significance for the contamination index in timely grasp and control water.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of for NH
3the control system of-N water quality online automatic monitor.This control system can realize the online auto monitoring to water pollution, and can realize the Long-distance Control to instrument, and system performance is stable.
Technical solution of the present invention is: for NH
3the control system of-N water quality online automatic monitor, comprise
Multichannel is inputted program control integrated operational amplifier, and it receives the outside detection signal of sending here, after this detection signal is amplified, is transported to analog to digital converter;
Analog to digital converter, it is inputted multichannel after amplifying signal that program control integrated operational amplifier sends here converts digital signal to and is transported to microprocessor by the I/O interface;
Microprocessor, its digital signal that analog to digital converter is sent here by the I/O interface is processed, and the light intensity value feedback after processing is transported to digital to analog converter, converts the photosignal after processing to NH
3-n-signal value is externally exported by output module, and other command signals after processing are transported to multi-path control relay by the I/O interface;
Digital to analog converter, its light intensity value feedback that microprocessor is sent here is carried out digital-to-analog conversion, and the analog signal output after changing; And
Multi-path control relay, it receives other command signals that microprocessor is sent here by the I/O interface, and external unit is carried out to corresponding control.
Further, described microprocessor is arm processor.
Again further, described microprocessor is 32 bit CPUs based on the ARM7 technology, the embedded operation system of software based on uCOS and OpenPCS of this CPU.
Further, described output module comprises simulation output interface and 485/RS232 communication interface, and described simulation output interface directly is connected with described microprocessor with the 485/RS232 communication interface.
Again further, described output module also comprises remote control terminal, and this remote control terminal is connected with the output terminal of described 485/RS232 communication interface.
Further, described output module also comprises passive node output, and described passive node output directly is connected with described microprocessor.
Further, this control system also comprises the human-computer interaction device who carries out information interaction with described microprocessor.
Again further, described human-computer interaction device is the configuration touch-screen.
Further, described I/O interface is serial i/O interface.
Described multichannel is inputted program control integrated operational amplifier and is connected with outside temperature sensor, liquid level sensor, photodetector and feedback detector.
Described multi-path control relay is connected with heater strip with outside ball valve, centrifugal pump, screening agent valve, developer valve, mark liquid valve, water sample valve, distillation water valve, exhaust-valve, T-valve, colorimetric valve, peristaltic pump, membrane pump.
The light intensity value feedback that described digital to analog converter is sent described microprocessor here carries out being transported to light emitting diode after digital-to-analog conversion.
The present invention compared with prior art has following advantage:
(1) control system of automonitor of the present invention comprises that microprocessor, multichannel input program control integrated operational amplifier, analog to digital converter, digital to analog converter and multi-path control relay, system architecture is simple, runnability is stable, can effectively realize the online auto monitoring of water pollution source is controlled.And this control system data transmission credibility is high, and the system rejection to disturbance ability is strong, is applicable to severe industrial environment.
(2) the present invention is based on the automatic control system of the environment online auto monitoring remote control terminal (RTU:Remote Terminal Unit) of ARM platform, possesses the remote transmission function of field extreme environment, can realize the Long-distance Control to instrument.Further, the present invention adopts uCOS and the OpenPCS embedded software operating system based on the ARM7 technology, can realize the real-time multi-task operation.
(3) measurement range of the present invention is wider, highly sensitive, and system favorable reproducibility, cost are low, meet the online auto monitoring requirement of on-the-spot pollution entering the water.
(4) control system of the present invention also comprises the configuration touch-screen, makes man-machine interaction easily and effectively.
The accompanying drawing explanation
Fig. 1 is NH of the present invention
3the system schematic of-N water quality online automatic monitor.
Fig. 2 is NH of the present invention
3the control system schematic diagram of-N water quality online automatic monitor.
Fig. 3 is NH of the present invention
3the control operation process flow diagram of-N water quality online automatic monitor.
Embodiment
Below with reference to accompanying drawing, embodiments of the invention are described.
As shown in Figure 1, NH
3-N water quality online automatic monitor system is connected and composed jointly by pretreatment unit 1, ball valve 2, centrifugal pump 3, screening agent valve 4, developer valve 5, mark liquid valve 6, water sample valve 7, distillation water valve 8, exhaust-valve 9, T-valve 10, colorimetric valve 11, peristaltic pump 12, membrane pump 13, measuring room 14, colorimetric chamber 15 and heater strip 16.According to the order of connection from top to bottom, its interconnected relationship is: pretreatment unit 1, ball valve 2, centrifugal pump 3 form the pretreatment system of monitor, sewage to institute's suction is filtered, and extracts detection by peristaltic pump 12 and the common action of water sample valve 7 again after standing a period of time; Peristaltic pump 12 is connected with the normal open walk of T-valve 10, and membrane pump 13 is connected with the normally closed passage of T-valve 10; T-valve 10 public passages are connected with measuring room 14; Screening agent valve 4, developer valve 5, mark liquid valve 6, water sample valve 7, distillation water valve 8 form conjuncted valve, enjoy the public passage of conjuncted valve; Measuring room 14 is connected with conjuncted valve top passage; Exhaust-valve 9 one ends are connected with conjuncted valve bottom passage, other end access waste liquid barrel; Colorimetric valve 11 1 ends are connected with conjuncted valve right-hand member passage, and the other end is connected with colorimetric chamber 15; Peristaltic pump 12, screening agent valve 4, developer valve 5, mark liquid valve 6, water sample valve 7, distillation water valve 8, photoelectric liquid level sensor 18 and measuring room 14 belong to the sample introduction metering units, control thus the amount of solution that enters colorimetric chamber 15; Mixing arrangement is comprised of membrane pump 13 and T-valve, and the solution that is mainly used in accelerating to enter in colorimetric chamber 15 mixes; Reaction colorimetric unit comprises colorimetric chamber 15, heater strip 16, temperature sensor 17, light emitting diode 26, photodetector 19, feedback detector 20 and colorimetric valve 11, be mainly used in sample and carry out complex reaction, after standing a period of time, then carry out colorimetric detection and finally by ARM7 platform control processor 24, carry out data analysis, draw absorbance and NH
3the relation of-N value.
Whole control system principle schematic as shown in Figure 2, control system comprises that microprocessor, multichannel input program control integrated operational amplifier, analog to digital converter, digital to analog converter, input and range control device and multi-path control relay, in present embodiment, microprocessor is arm processor (can be also other processor), further, adopt ARM7 platform control processor.
System realizes the man-machine interface operation of instrument alternately by configuration touch-screen 28 and ARM7 platform control processor 24.In control procedure, the signal of temperature sensor 17, liquid level sensor 18, photodetector 19 and feedback detector 20 is after multichannel is inputted program control integrated operational amplifier 21 and carried out the signal amplification, utilizing A/D analog to digital converter 22 and serial i/O interface 23 to be delivered to ARM7 platform control processor 24 processes, light intensity value feedback after wherein processing is transported to D/A digital to analog converter 25 and is sent to light emitting diode 26 again, and then regulates the stability of light source; Other command signals that ARM7 platform control processor 24 sends (comprising temperature signal, liquid level signal etc.) are transported to multi-path control relay 27 by serial i/O interface 23, the then control to ball valve 2, centrifugal pump 3, screening agent valve 4, developer valve 5, mark liquid valve 6, water sample valve 7, distillation water valve 8, exhaust-valve 9, T-valve 10, colorimetric valve 11, peristaltic pump 12, membrane pump 13 and heater strip 16 through multi-path control relay 27 settling signals; The NH that ARM7 platform control processor 24 is processed after calculating
3-n-signal value shows and simulates output interface 29, passive node output 30 and 485/RS232 communication interface 31 and externally export through configuration touch-screen 28.
The output module of control system comprises simulation output interface and 485/RS232 communication interface, and the remote control terminal (RTU) 32 in addition be connected with the output terminal of 485/RS232 communication interface, can realize the Long-distance Control to instrument.Described output module also comprises passive node output, and this passive node output directly is connected on ARM7 platform control processor, can be connected with the tool interface system of other any communications protocol.
Wherein also have a photoelectric signal processing circuit, can effectively process the mA magnitude small-signal by photodetector 19 inputs; And adopted the accurate constant current of closed loop to control self compensating system, the variation of light emitting diode 26 light intensity value that detect by feedback detector 20, regulate the supply current of light source, eliminated the light source drift problem that all kinds of effects because of environmental baseline, components and parts and circuit in the instrument testing process produce.
The multichannel of the present embodiment is inputted program control integrated operational amplifier 21 and is chosen the AD704 chip of AnalogDevices producer and the Max543 chip of Maxim producer, the A/D analog to digital converter is chosen the LTC1867IGN chip of Linear producer, the D/A digital to analog converter is chosen the Max543 chip of Maxim producer, multi-path control relay is chosen the ASRP2-202D chip of AIKS producer, the simulation output interface is 4～20mA simulation output interface preferably, chooses the LT1013IN8 chip of Linear producer.
As shown in Figure 3, at first ARM7 platform control processor 24 sends signal operation ball valve 2 and centrifugal pump 3 by multi-path control relay 27 to whole system control operation process flow diagram, extracts Wastewater Sample and enters pretreatment unit 1, carries out filtering and standing; Control peristaltic pump 12, exhaust-valve 9 and colorimetric valve 11 simultaneously, and photoelectric liquid level sensor 18 measuring fixed amounts, the raffinate in colorimetric chamber 15 got rid of; Then control peristaltic pump 12, distillation water valve 8 and colorimetric valve 11, and photoelectric liquid level sensor 18 measuring fixed amounts, extract distilled water and enter colorimetric chamber 15, control again the cleaning that froths of distilled water in membrane pump 13 and T-valve 10 contrast colors chambers 15, finally control the distilled water in peristaltic pump 12, exhaust-valve 9 and the emptying colorimetric of colorimetric valve 11 chamber 15; After above-mentioned emptying row is residual, cleaning completes, after 7 actions of peristaltic pump 12, water sample valve start at first from pretreatment unit 1, to extract water sample and enter measuring room 14, colorimetric chamber 15 is injected in peristaltic pump 12,11 actions of colorimetric valve, and then screening agent, developer, distilled water extract and enter colorimetric chamber 15 by peristaltic pump 12, screening agent valve 4, developer valve 5, distillation water valve 8 and colorimetric valve 11 respectively; After above-mentioned sample introduction Job readiness, the mixing that frothed of solution in membrane pump 13 and T-valve 10 action contrast colors chambers 15, solution is mixed within a certain period of time, then controlling heater strip 16 makes mixed solution be heated to uniform temperature, now temperature is detected and is obtained by temperature sensor 17, standing certain hour again, solution fully carries out complex reaction, finally by light emitting diode 26, photodetector 19 and feedback detector 20, carries out colorimetric detection; After the colorimetric reading is showing screen display,, cleaning process residual according to above-mentioned emptying row carried out emptying cleaning to pipeline.NH like this
3a sense cycle of-N water quality online automatic monitor completes.
Wherein, photoelectric liquid level sensor 18 is for detection of the size of measuring room 14 sample sizes; Temperature sensor 17 detects the solution reaction temperature of colorimetric chamber 15, till remaining on uniform temperature always; Light emitting diode 26 and photodetector 19 detect the transmittance of blank solution and sewage; Feedback detector 20 is surveyed the variation of light emitting diode 26 luminous intensities, in order to regulate supply current, has eliminated the light source drift problem that all kinds of effects because of environmental baseline, components and parts and circuit in the instrument testing process produce.
The photosignal that colorimetric detection produces, after multichannel is inputted program control integrated operational amplifier 21 and carried out the signal amplification, utilizes A/D analog to digital converter 22 and serial i/O interface 23 to be delivered to ARM7 platform control processor 24, and the settling signal data are processed, and draw NH
3-N value shows and 4～20mA simulation output interface 29, passive node output 30 and the externally output 31 of 485/RS232 communication interface through configuration touch-screen 28, and can carry out remote transmission by RTU32.
The content be not described in detail in instructions of the present invention belongs to professional and technical personnel in the field's known technology.
The above; it is only preferred embodiment of the present invention; not the present invention is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong to the protection domain of technical solution of the present invention.
Claims (10)
1. for NH
3the control system of-N water quality online automatic monitor, is characterized in that: comprise
Multichannel is inputted program control integrated operational amplifier, and it receives the outside detection signal of sending here, after this detection signal is amplified, is transported to analog to digital converter;
Analog to digital converter, it is inputted multichannel after amplifying signal that program control integrated operational amplifier sends here converts digital signal to and is transported to microprocessor by the I/O interface;
Microprocessor, its digital signal that analog to digital converter is sent here by the I/O interface is processed, and the light intensity value feedback after processing is transported to digital to analog converter, converts the photosignal after processing to NH
3-n-signal value is externally exported by output module, and other command signals after processing are transported to multi-path control relay by the I/O interface;
Digital to analog converter, its light intensity value feedback that microprocessor is sent here is carried out digital-to-analog conversion, and the analog signal output after changing; And
Multi-path control relay, it receives other command signals that microprocessor is sent here by the I/O interface, and external unit is carried out to corresponding control.
2. according to claim 1 for NH
3the control system of-N water quality online automatic monitor is characterized in that: described microprocessor is arm processor.
3. according to claim 2 for NH
3the control system of-N water quality online automatic monitor is characterized in that: described microprocessor is 32 bit CPUs based on the ARM7 technology, the embedded operation system of software based on uCOS and OpenPCS of this CPU.
4. according to claim 1 and 2 for NH
3the control system of-N water quality online automatic monitor is characterized in that: described output module comprises simulation output interface and 485/RS232 communication interface, and described simulation output interface directly is connected with described microprocessor with the 485/RS232 communication interface.
5. according to claim 4 for NH
3the control system of-N water quality online automatic monitor is characterized in that: described output module also comprises remote control terminal, and this remote control terminal is connected with the output terminal of described 485/RS232 communication interface.
6. according to claim 4 for NH
3the control system of-N water quality online automatic monitor is characterized in that: described output module also comprises passive node output, and described passive node output directly is connected with described microprocessor.
7. according to claim 1 and 2 for NH
3the control system of-N water quality online automatic monitor is characterized in that: this control system also comprises the human-computer interaction device who carries out information interaction with described microprocessor.
8. according to claim 7 for NH
3the control system of-N water quality online automatic monitor is characterized in that: described human-computer interaction device is the configuration touch-screen.
9. according to claim 1 and 2 for NH
3the control system of-N water quality online automatic monitor is characterized in that: described multichannel is inputted program control integrated operational amplifier and is connected with temperature sensor, photoelectric liquid level sensor, photodetector and feedback detector;
Described multi-path control relay is connected with heater strip 16 with outside ball valve 2, centrifugal pump 3, screening agent valve 4, developer valve 5, mark liquid valve 6, water sample valve 7, distillation water valve 8, exhaust-valve 9, T-valve 10, colorimetric valve 11, peristaltic pump 12, membrane pump 13.
10. according to claim 1 and 2 for NH
3the control system of-N water quality online automatic monitor is characterized in that: the light intensity value feedback that described digital to analog converter is sent described microprocessor here carries out being transported to light emitting diode after digital-to-analog conversion.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547412A (en) * | 2015-12-10 | 2016-05-04 | 四川理工学院 | Reagent metering device for ammonia nitrogen detection based on machine vision |
| CN105606593A (en) * | 2015-12-10 | 2016-05-25 | 四川理工学院 | Ammonia nitrogen image detection device |
| CN110044889A (en) * | 2019-05-05 | 2019-07-23 | 宿迁学院产业技术研究院 | A kind of novel good wine detection device |
-
2013
- 2013-09-27 CN CN201310454550.6A patent/CN103499938A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547412A (en) * | 2015-12-10 | 2016-05-04 | 四川理工学院 | Reagent metering device for ammonia nitrogen detection based on machine vision |
| CN105606593A (en) * | 2015-12-10 | 2016-05-25 | 四川理工学院 | Ammonia nitrogen image detection device |
| CN110044889A (en) * | 2019-05-05 | 2019-07-23 | 宿迁学院产业技术研究院 | A kind of novel good wine detection device |
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Application publication date: 20140108 |
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