CN202649122U - Chemical oxygen demand (COD) on-line monitor - Google Patents
Chemical oxygen demand (COD) on-line monitor Download PDFInfo
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- CN202649122U CN202649122U CN 201220269631 CN201220269631U CN202649122U CN 202649122 U CN202649122 U CN 202649122U CN 201220269631 CN201220269631 CN 201220269631 CN 201220269631 U CN201220269631 U CN 201220269631U CN 202649122 U CN202649122 U CN 202649122U
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Abstract
The utility model provides a chemical oxygen demand (COD) on-line monitor which comprises a programmable logic controller (PLC) control system control pipeline, a sample and reagent storing device, a reaction device and a photovoltaic measuring tube, wherein the sample and reagent storing device, the reaction device and the photovoltaic measuring tube are controlled to be communicated. A piston pump used for sample introduction is arranged on the outer side of the pipeline, the sample and reagent storing device comprises a water sample bottle, a normal zero solution bottle, a COD standard solution bottle, a screening agent solution bottle, an oxidant solution bottle and a catalyst solution bottle, wherein opening and closing of the water sample bottle is chosen by a multiport valve, and the multiport valve chooses opening and closing of the water sample bottle or a reagent pipeline to control sample introduction. The reaction device comprises a heater strip, a digestion colorimetric tube, a fan, a colorimetric light source and an upper solenoid valve, a photovoltaic measuring tube is in linkage with the control pipeline, an upper light source and a photovoltaic detector, and a lower light source and a photoelectricity detector are arranged on the outside of the photovoltaic measuring tube which is connected with a PLC control system through a photovoltaic conversion circuit. The COD on-line monitor integrates light, machine and electricity through PLC control technology, achieves complete automation, and is low in failure rate, maintenance frequency, and reagent consumption and high in cost performance.
Description
Technical field
The utility model relates to a kind of water quality automatic monitoring device, is specifically related to a kind of COD on-line monitoring instrument.
Technical background
COD on-line monitoring instrument can be heated to 175 ℃ to water sample, potassium dichromate digestion solution, silver sulfate solution (silver sulfate adds more effectively oxidation straight chain fatty compound as catalyzer) and the mixed liquor of the concentrated sulphuric acid, color can change behind the organism in the dichromic acid ionic oxide formation solution, analyser detects the variation of this color, and this variation is converted into the COD value exports out.The dichromic acid ionic weight that consumes is equivalent to oxidable organism amount.
Existing COD on-line monitoring instrument needs manual intervention mostly, carries out existing auxiliary tone reagent processed, and in the prior art delivery of therapeutic agents and sample to react be to adopt solenoid valve to control.Although the diaphragm electromagnetic valve antiseptic property is very high; but the reagent cleanliness but there is higher requirement; when reagent is unclean; often can occur flowing backwards, and this class solenoid valve has the pumping function that fluid is inhaled into or discharges with its switching, so have higher requirement for the precision of analytical sampling; especially in the situation that the dosage of getting seldom; the error of bringing is serious especially, more seriously needs to maintain frequently, causes prior art Instrumental monitoring accuracy lower.The utility model comes therefrom.
Summary of the invention
The utility model purpose is to provide a kind of COD on-line monitoring instrument, is suitable for chemical oxygen consumption (COC) in (0～5000) mg/L scope and chloride concentration is lower than the waste water of 2.5g/L Cl-, goes for the waste water that chloride concentration is lower than 20g/L Cl-.
In order to solve these problems of the prior art, the technical scheme that the utility model provides is:
A kind of COD on-line monitoring instrument, comprise sample and reagent storage device and reaction unit and photoelectrometer buret that PLC control system pilot piping and control are communicated with, described pipeline arranged outside is used for the piston pump of sample introduction, described sample and reagent storage device comprise water sample bottle, nil norm solution bottle, COD standard solution bottle, screening agent solution bottle, oxidizing agent solution bottle, the catalyst solution bottle that the multiport valve selection opens and closes, and multiport valve selects to open and close water sample or reagent pipeline control sample introduction.Described reaction unit comprises heater strip, clear up color comparison tube, fan, than color light source, upper solenoid valve, above-mentioned photoelectrometer buret connects with pilot piping, and light source and photoelectric detector, lower light source and photoelectric detector are connected with the PLC control system by photoelectric switching circuit on the photoelectrometer buret peripheral hardware.
The utility model COD on-line monitoring instrument uses step as follows:
1. measure the container of water sample, reagent volume and clear up test tube with new water sample flushing.
2. open the piston pump sample introduction.Water sample does not directly contact with the piston pump line, and an air cushioning district is arranged between pump line and water sample.The volume of sample introduction is by a visual measuring system control.
3. open piston pump and add reagent (mercuric sulfate, potassium dichromate, sulfuric acid comprise catalyzer), the volume of reagent is also by visual measuring system control.
4. by bubbling mixed sample and reagent.
5. tighten clear up test tube cap after, by the heating of metal silk solution is heated to 175 ℃, digestion time is controlled automatically by measuring system.
6. after the solution cooling, discharge solution by piston pump.
7. in user-defined measuring period, analyser can utilize built-in calibration mark liquid and cleaning solution automatically to calibrate and clean.
The utility model has the following advantages:
The utility model is clear and definite based on national standard, principle, data do not need the contrast conversion, and the operation steps of control is identical with chemical analysis automatically, is beneficial to especially the operational administrative personnel and understands.Adopt the PLC control technology to merge light, mechanical, electrical, in the condition and step in strictly observing standard, accomplish fully and completely robotization.Unique design makes this product have less trouble more, lower maintenance, lower reagent consumption and higher cost performance than like product.
Description of drawings
Figure l is structural representation of the present utility model.
Specific embodiment
Below in conjunction with accompanying drawing and example to such scheme is described further.
Embodiment is such as figure l, a kind of COD on-line monitoring instrument, comprise sample that PLC control system pilot piping control is communicated with and reagent storage device and reaction unit and the photoelectrometer buret 2 that connects with pilot piping, described pipeline arranged outside is used for the piston pump 1 of sample introduction, described sample and reagent storage device comprise water sample bottle 31, nil norm solution bottle 32, COD standard solution bottle 33, screening agent solution bottle 34, oxidizing agent solution bottle 35, the catalyst solution bottle 36 that multiport valve 3 selections open and close, and multiport valve 3 selects to open and close water samples or reagent pipeline control sample introduction.Described reaction unit comprises heater strip 45, clear up color comparison tube 4, fan 41, than color light source 42, upper solenoid valve 43, light source and photoelectric detector 21, lower light source and photoelectric detector 22 are connected with the PLC control system by photoelectric switching circuit on above-mentioned photoelectrometer buret 2 peripheral hardwares, and concrete can be at the two ends of gauge line scale arranged outside photoelectric detector.
Claims (2)
1. COD on-line monitoring instrument, it is characterized in that: comprise sample and reagent storage device and reaction unit and photoelectrometer buret that PLC control system pilot piping and control are communicated with, described pipeline arranged outside is used for the piston pump of sample introduction, described sample and reagent storage device comprise the water sample bottle that the multiport valve selection opens and closes, the nil norm solution bottle, the COD standard solution bottle, the screening agent solution bottle, the oxidizing agent solution bottle, the catalyst solution bottle, multiport valve selects to open and close water sample or reagent pipeline control sample introduction, described reaction unit comprises heater strip, clear up color comparison tube, fan, compare color light source, upper solenoid valve, above-mentioned photoelectrometer buret connects with pilot piping, light source and photoelectric detector on the photoelectrometer buret peripheral hardware, lower light source and photoelectric detector are connected with the PLC control system by photoelectric switching circuit.
2. COD on-line monitoring instrument as claimed in claim 1 is characterized in that: it is characterized in that described reaction unit arranged outside detects the photoelectric detector of end reaction liquid absorbance, described photoelectric detector is connected with the PLC control system by photoelectric switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220269631 CN202649122U (en) | 2012-06-08 | 2012-06-08 | Chemical oxygen demand (COD) on-line monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220269631 CN202649122U (en) | 2012-06-08 | 2012-06-08 | Chemical oxygen demand (COD) on-line monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202649122U true CN202649122U (en) | 2013-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220269631 Expired - Fee Related CN202649122U (en) | 2012-06-08 | 2012-06-08 | Chemical oxygen demand (COD) on-line monitor |
Country Status (1)
| Country | Link |
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| CN (1) | CN202649122U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064121A (en) * | 2016-12-29 | 2017-08-18 | 核工业北京化工冶金研究院 | The device of uranium concentration in a kind of application colorimetric method on-line checking adsorption tail liquid |
-
2012
- 2012-06-08 CN CN 201220269631 patent/CN202649122U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107064121A (en) * | 2016-12-29 | 2017-08-18 | 核工业北京化工冶金研究院 | The device of uranium concentration in a kind of application colorimetric method on-line checking adsorption tail liquid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130102 Termination date: 20130608 |