CN2344773Y - On-line chemical oxygen demand analyser - Google Patents
On-line chemical oxygen demand analyser Download PDFInfo
- Publication number
- CN2344773Y CN2344773Y CN 98247842 CN98247842U CN2344773Y CN 2344773 Y CN2344773 Y CN 2344773Y CN 98247842 CN98247842 CN 98247842 CN 98247842 U CN98247842 U CN 98247842U CN 2344773 Y CN2344773 Y CN 2344773Y
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- sampling
- pump
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- reaction tube
- oxygen demand
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Abstract
The utility model relates to an on-line chemical oxygen demand analyzer, comprising sampling devices, dosing devices, reactors, and controllers, wherein, the sampling devices are connected to the reactors through the dosing devices; the sampling devices are provided with a sampling pump; the conveying and metering devices of water sample and reagents are formed by that the dosing devices are matched with multiple-way valves and peristaltic pumps; the reactors are provided with a reaction tube which is connected with a heater; one side of the reaction tube is provided with light sources, and another side of the reaction tube is provided with a photodetector; the controllers are respectively connected with and control the sampling pump, a dosing pump, the heater and the light sources. Measuring ranges can be chosen due to users' needs. The utility model has the advantages of fast and real time measuring results, high precision and reliability, and strong environment adapting ability.
Description
The utility model relates to the device of measuring water quality, especially a kind of online chemical oxygen demand (COD) analyser of measuring oxidant consumption amount when handling water sample.
Chemical oxygen demand (COD) is called for short COD, and the degree that the reflection water body is polluted by reducing substances is one of index of organism relative content in the water body.External online COD analytical instrument is quite general, but some product structure complexity, consumable accessory many, environmental baseline is required harsh, and the analytical approach of some product does not meet China's standard, its test result can not be as the Environmental Protection in China foundation of enforcing the law.Domestic also have the online COD analyser that adopts potassium dichromate method, but precision and reliability also are not very high.
The purpose of this utility model provides a kind of online chemical oxygen demand (COD) analyser, meets China's standard, improves precision and reliability, and is simple in structure and can adapt to complex environment.
The purpose of this utility model is achieved in that and comprises sampling thief, chemicals dosing plant, reactor and control device, is connected to reactor by sampling thief through chemicals dosing plant; Wherein sampling thief has a sampling pump, and chemicals dosing plant is cooperated conveying and the measuring apparatus of forming water sample and reagent with peristaltic pump by multiport valve; Reactor has a reaction tube that connects well heater, one side reaction tube has a light source, another side has photodetector; Control device is control linkage sampling pump, dosing pump, well heater and light source respectively.
Described sampling pump is two-way peristaltic pump, receives an overflow buffering cup by sampling pipe.
Fig. 1 is a structural drawing of the present utility model.
Fig. 2 is the utility model operation control circuit schematic diagram.
Fig. 3 is the circuit diagram of control device.
Fig. 4 is a workflow diagram of the present utility model.
1. sampling pumps, 2. overflows buffering cup, 3. multiport valves, 4. peristaltic pumps, 5. reaction tubes, 6. well heaters, 7. light sources, 8. fans, 9. waist valve, 10. computing machines, 11. overflow lips, 12. optical fiber among the figure
Adopt two-way peristaltic pump as sampling pump, have blowing function, the residue water sample in the overflow cup is all drained after can guaranteeing once to analyze end, avoid mixing with next water sample.Can blow away simultaneously the solid particle that enters the water sample pipe and unnecessary water sample, avoid the sampling pipe obstruction, can prevent that sampling in winter pipe inside from freezing because of liquid storage simultaneously.Adopt an overflow buffering cup buffer memory water sample, sampling pump moves prior to sample-adding pump, and when waiting to fill it up with the overflow cup and overflow occurring, dosing pump just begins dosing, and it is mobile so both can to have guaranteed that in adding the water sample process overflow water in the cup is similar to, and has guaranteed the real-time of water sampling.Simultaneously can guarantee that also water sample can move into reaction chamber reliably.
Chemicals dosing plant comprises conveying and metering two parts of water sample and reagent.The transfusion of employing peristaltic pump is drawn solution with suction type.Cooperate with the timekeeping system of computing machine simultaneously, can finish the metering of water sample and reagent.Because nearly four kinds of water sample and reagent, so adopt multiport valve to cooperate conveying and the measuring apparatus of forming water sample and reagent with peristaltic pump.
Reactor is made up of reaction tube, well heater, tintmeter.Heater length be water sample and reagent in the reaction tube overall height 4/5ths, guarantee that liquid can thermally equivalent.Well heater adds insulation material, avoids the well heater thermal loss, avoids the outside radiations heat energy of well heater simultaneously, makes the whole instrument temperature too high.The photoelectric colorimetry system is made up of light source, optical fiber and optical filter.Owing to reaction liquid is carried out colorimetric, and is the high-temperature region herein, for eliminating the influence of temperature, adopt optical fiber to photoelectric switching circuit, make opto-electronic conversion away from the high-temperature region.Photoelectric conversion section is made up of photodetector and amplifier.
Control device is divided into hardware and software two parts, and wherein hardware components comprises microsystem and peripheral control circuit.Because of the dose control of adding of peristaltic pump needs high-precision timing, therefore adopt the high-resolution timer plate, guarantee the dosing precision of peristaltic pump.
The chemical oxygen demand (COD) of water sample can be added acidity, temperature of reaction and the time of the kind of oxygenant and concentration, reaction solution and having or not of catalyzer and obtained different results.For industrial waste water, China's regulation potassium dichromate method.The system that adopts is that potassium dichromate open pipe reflux is cleared up the organism method of (comprising the reducing inorganic thing).
This instrument detecting be reaction back Cr
3+Concentration.According to Lang Bai-Beer law, the dullness of solution is to be directly proportional with the product of thickness of the concentration of coloring matter and liquid layer in the solution, i.e. dullness and Cr
3+Concentration be positive relation-changing.Condition standard series methods such as this instrument employing.Use identical reagent and amount of reagent identical, reaction conditions identical and in same color comparison tube colorimetric.In the finite concentration scope, obtain the relation curve of solution absorbance and COD value, by measuring solution absorbency, draw the COD value of detected water sample again.
Superiority of the present utility model is: simple and reasonable, and can be according to user's needs Select range, measurement result is quick, real-time, and its precision and reliability are all very high; Sampling pump Have blowing function, anti-blocking, antifreeze, accommodative ability of environment is strong; Low price.
Claims (2)
1. an online chemical oxygen demand (COD) analyser is characterized in that: comprise sampling thief, chemicals dosing plant, reactor and control device, be connected to reactor by sampling thief through chemicals dosing plant; Wherein sampling thief has a sampling pump (1), and chemicals dosing plant cooperates conveying and the measuring apparatus of forming water sample and reagent by multiport valve (3) with peristaltic pump (4); Reactor has a reaction tube (5) that connects well heater (6), one side reaction tube has a light source (7), another side has photodetector; Control device is control linkage sampling pump (1), dosing pump, well heater (6) and light source (7) respectively.
2. online chemical oxygen demand (COD) analyser according to claim 1 is characterized in that: described sampling pump (1) is two-way peristaltic pump, receives an overflow buffering cup (2) by sampling pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98247842 CN2344773Y (en) | 1998-12-04 | 1998-12-04 | On-line chemical oxygen demand analyser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98247842 CN2344773Y (en) | 1998-12-04 | 1998-12-04 | On-line chemical oxygen demand analyser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2344773Y true CN2344773Y (en) | 1999-10-20 |
Family
ID=33992987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98247842 Expired - Lifetime CN2344773Y (en) | 1998-12-04 | 1998-12-04 | On-line chemical oxygen demand analyser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2344773Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279123A (en) * | 2011-06-14 | 2011-12-14 | 聚光科技(杭州)股份有限公司 | Pretreatment method and device |
| CN103105363A (en) * | 2012-11-06 | 2013-05-15 | 苏州聚阳环保科技有限公司 | Water quality detector with temperature isolation |
| CN106596434A (en) * | 2016-12-26 | 2017-04-26 | 成都冠禹科技有限公司 | Water quality detecting system |
| WO2019067972A1 (en) * | 2017-09-28 | 2019-04-04 | Hach Company | In-situ reduction of hexavalent chromium |
-
1998
- 1998-12-04 CN CN 98247842 patent/CN2344773Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279123A (en) * | 2011-06-14 | 2011-12-14 | 聚光科技(杭州)股份有限公司 | Pretreatment method and device |
| CN103105363A (en) * | 2012-11-06 | 2013-05-15 | 苏州聚阳环保科技有限公司 | Water quality detector with temperature isolation |
| CN106596434A (en) * | 2016-12-26 | 2017-04-26 | 成都冠禹科技有限公司 | Water quality detecting system |
| CN106596434B (en) * | 2016-12-26 | 2020-01-03 | 高安水务有限公司 | Water quality detection system |
| WO2019067972A1 (en) * | 2017-09-28 | 2019-04-04 | Hach Company | In-situ reduction of hexavalent chromium |
| CN111051250A (en) * | 2017-09-28 | 2020-04-21 | 哈希公司 | In situ reduction and quenching of hexavalent chromium |
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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 | ||
| CX01 | Expiry of patent term |