CN220455161U - High-precision chemical oxygen demand COD measuring instrument - Google Patents
High-precision chemical oxygen demand COD measuring instrument Download PDFInfo
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- CN220455161U CN220455161U CN202322045999.9U CN202322045999U CN220455161U CN 220455161 U CN220455161 U CN 220455161U CN 202322045999 U CN202322045999 U CN 202322045999U CN 220455161 U CN220455161 U CN 220455161U
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- cod
- photoelectric tube
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- light
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 24
- 239000001301 oxygen Substances 0.000 title claims abstract description 24
- 239000000126 substance Substances 0.000 title claims abstract description 22
- 238000012545 processing Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- 238000000034 method Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 238000000053 physical method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses a high-precision Chemical Oxygen Demand (COD) measuring instrument, which comprises an interference filter, an emitting light device and a receiving light device, wherein the interference filter is arranged on the COD measuring instrument; the device comprises a light emitting device, a receiving device and a container, wherein a to-be-tested vessel accommodating cavity is formed between the light emitting device and the receiving device, the light emitting device comprises a COD (chemical oxygen demand) light emitting photoelectric tube and a chromaticity light emitting photoelectric tube, the receiving device comprises a COD receiving photoelectric tube and a chromaticity light receiving photoelectric tube, and the COD light emitting photoelectric tube and the chromaticity light emitting photoelectric tube respectively correspond to the COD receiving photoelectric tube and the chromaticity light receiving photoelectric tube in position. The utility model has the advantages of convenient operation, improved measurement accuracy of oxygen demand in water body and ensured measurement stability.
Description
Technical Field
The utility model relates to the technical field of measuring equipment, in particular to a high-precision Chemical Oxygen Demand (COD) measuring instrument.
Background
Oxygen demand COD (Chemical Oxygen Demand) refers to the amount of reducing species in a water sample that need to be oxidized. The method for measuring COD is mainly divided into two types of chemical methods and physical methods. The basic principle of the chemical method is that the reducing substances in the water sample are oxidized by using a strong oxidant, and the consumed oxidant amount is calculated and converted into the consumed oxygen amount. The standard method is a potassium dichromate method; the physical method is mainly a spectrophotometry method, and based on the lambert beer law, the COD value of the water sample is calculated by measuring the absorbance of the sewage to the light with specific wavelength and then comparing the stored standard curve.
However, the chemical method used at present has the defects of complicated operation steps, long analysis time, high energy consumption and secondary pollution caused by reagents; the accuracy of the physical method for measuring COD on the water sample of complex organic matters is not high, and the application range is narrow.
Therefore, there is a need to design a high-precision Chemical Oxygen Demand (COD) meter to solve the above problems.
Disclosure of Invention
In order to overcome the defects, the utility model aims to provide a high-precision Chemical Oxygen Demand (COD) measuring instrument which is convenient to operate, improves the measurement precision of oxygen demand in water body and ensures the measurement stability.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a high-precision COD measuring instrument comprises an interference filter, a light emitting device and a light receiving device; the device comprises a light emitting device, a receiving device and a container, wherein a to-be-tested vessel accommodating cavity is formed between the light emitting device and the receiving device, the light emitting device comprises a COD (chemical oxygen demand) light emitting photoelectric tube and a chromaticity light emitting photoelectric tube, the receiving device comprises a COD receiving photoelectric tube and a chromaticity light receiving photoelectric tube, and the COD light emitting photoelectric tube and the chromaticity light emitting photoelectric tube respectively correspond to the COD receiving photoelectric tube and the chromaticity light receiving photoelectric tube in position.
Further, the light emitting device is detachably connected with the light receiving device, a plurality of first connecting seats are arranged on the connecting side of the light emitting device along the height direction of the light emitting device, a plurality of second connecting seats are arranged on the connecting side of the light receiving device along the height direction of the light receiving device, and the first connecting seats and the second connecting seats are fixedly locked and attached through screws. The disassembly, maintenance and installation of the light emitting device and the light receiving device are convenient, and the service lives of the light emitting device and the light receiving device are effectively prolonged.
Further, the COD emission photocell and the chromaticity emission photocell are arranged along the height direction of the light emitting device, and the edges of the COD emission photocell and the chromaticity emission photocell are provided with square grooves, the COD receiving photocell and the chromaticity receiving photocell are arranged along the height direction of the light receiving device, and the edges of the COD receiving photocell and the chromaticity receiving photocell are provided with circular grooves. The installation of COD emission photoelectric tube and chromaticity emission photoelectric tube is convenient for through setting up the square groove, is convenient for the installation of COD receiving photoelectric tube and chromaticity receiving photoelectric tube through setting up the circular groove, COD emission photoelectric tube and chromaticity emission photoelectric tube respectively with COD receiving photoelectric tube and chromaticity receiving photoelectric tube position corresponding, guarantee that COD receiving photoelectric tube and chromaticity receiving photoelectric tube can receive corresponding detected signal.
Further, the upper covers of the light emitting device and the light receiving device are provided with mounting shells, each mounting shell comprises a shell and a chassis, an operation display screen is assembled on the shell, and a limited space for placing a signal processing circuit board is reserved between the shell and the chassis. The mounting shell can protect the light emitting device and the light receiving device, and prolong the service lives of the light emitting device and the light receiving device. The signal processing circuit board can process the received light source signals and transmit and display the light source signals on the operation display screen, so that the light source signals are convenient to read.
Further, the one end that keeps away from the operation display screen at shell top has been seted up and has been let down the groove, receiving light device and emitting light device all with operation display screen electric connection. The yielding groove is arranged to facilitate the putting in and taking out of the vessel to be tested.
Further, the bottom of the light emitting device and the bottom of the light receiving device are provided with mounting bases, and the mounting bases are connected with the chassis through a plurality of supporting blocks.
Further, the tops of the light receiving device and the light emitting device are respectively provided with an arc-shaped groove, and the arc-shaped grooves correspond to the positions of the abdicating grooves. The arc-shaped groove is convenient for a worker to take out the vessel to be tested for replacing the sample.
The utility model has the beneficial effects that:
according to the utility model, the light emitting device, the light receiving device and the operation display screen are mutually matched, the COD light emitting photoelectric tube works to emit ultraviolet light to penetrate through a vessel to be measured filled with water, and an interference filter is used for detecting luminosity of the ultraviolet light sensitive photoelectric tube with specific wavelength, so that an initial signal of COD formed after detection is received by the COD receiving photoelectric tube, and the interference of complex organic matters in the water on measurement is effectively reduced; the chromaticity emission photoelectric tube works to emit infrared light to penetrate through a vessel to be measured filled with a water body, an interference filter is used for detecting luminosity of the photoelectric tube sensitive to infrared light with specific wavelength, the chromaticity receiving photoelectric tube receives an initial chromaticity signal, the interference of chromaticity on measurement is effectively reduced in the detection process, the influence of stray light during measurement is avoided, the measurement accuracy of oxygen demand in the water body is improved, and the measurement stability is guaranteed.
Drawings
FIG. 1 is an isometric view of an overall structure of an embodiment of the present utility model;
FIG. 2 is a schematic cross-sectional view of an overall structure according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of an embodiment of an emitting device;
FIG. 4 is a schematic diagram of a light receiving device according to an embodiment of the utility model;
in the figure: 1. operating a display screen; 2. a mounting shell; 21. a housing; 22. a chassis; 3. an emission light device; 31. COD emitting photocell; 32. a chromaticity emission photocell; 33. a first connecting seat; 4. a mounting base; 5. a light receiving device; 51. COD receiving photocell; 52. a chromaticity receiving photocell; 53. a second connecting seat; 6. an arc-shaped groove; 7. a square groove; 8. a support block; 9. a vessel accommodating cavity to be measured; 10. a circular groove.
Detailed Description
The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.
Referring to fig. 1 to 4, a high-precision Chemical Oxygen Demand (COD) measuring instrument in this embodiment includes an emitting light device 3 and a receiving light device 5; a vessel accommodating cavity 9 to be tested is formed between the light emitting device 3 and the light receiving device 5, the light emitting device 3 comprises a COD emitting photoelectric tube 31 and a chromaticity emitting photoelectric tube 32, the light receiving device 5 comprises a COD receiving photoelectric tube 51 and a chromaticity receiving photoelectric tube 52, and the COD emitting photoelectric tube 31 and the chromaticity emitting photoelectric tube 32 respectively correspond to the COD receiving photoelectric tube 51 and the chromaticity receiving photoelectric tube 52 in position.
The COD emitting phototube 31 works to emit ultraviolet light to penetrate a vessel to be measured filled with a water body, an interference filter is used for carrying out photometric detection on the ultraviolet light sensitive phototube with specific wavelength, and an initial signal of the COD formed after detection is received by the COD receiving phototube 51, so that the interference of complex organic matters in the water body on measurement is effectively reduced; the chromaticity emission photoelectric tube 32 works to emit infrared light to penetrate through a vessel to be measured filled with water, an interference filter is used for detecting luminosity of the photoelectric tube sensitive to infrared light with specific wavelength, the chromaticity receiving photoelectric tube 52 receives an initial chromaticity signal, the interference of chromaticity on measurement is effectively reduced in the detection process, the influence of stray light during measurement is avoided, the measurement accuracy of oxygen demand in the water is improved, and the measurement stability is guaranteed.
The light emitting device 3 is detachably connected with the light receiving device 5, a plurality of first connecting seats 33 are arranged on the connecting side of the light emitting device 3 along the height direction of the light emitting device, a plurality of second connecting seats 53 are arranged on the connecting side of the light receiving device 5 along the height direction of the light receiving device, and the first connecting seats 33 and the second connecting seats 53 are fixedly locked and attached through screws. The disassembly, maintenance and installation of the light emitting device 3 and the light receiving device 5 are convenient, and the service lives of the light emitting device 3 and the light receiving device 5 are effectively prolonged.
The COD emitting photocell 31 and the chromaticity emitting photocell 32 are arranged along the height direction of the emitting light device 3, and the edges of the COD emitting photocell 31 and the chromaticity emitting photocell 32 are provided with square grooves 7, the COD receiving photocell 51 and the chromaticity receiving photocell 52 are arranged along the height direction of the receiving light device 5, and the edges of the COD receiving photocell 51 and the chromaticity receiving photocell 52 are provided with circular grooves 10. The installation of COD emission photoelectric tube 31 and chromaticity emission photoelectric tube 32 is convenient for through setting up square groove 7, is convenient for the installation of COD receiving photoelectric tube 51 and chromaticity receiving photoelectric tube 52 through setting up circular groove 10, COD emission photoelectric tube 31 and chromaticity emission photoelectric tube 32 respectively with COD receiving photoelectric tube 51 and chromaticity receiving photoelectric tube 52 position corresponding, guarantee that COD receiving photoelectric tube 51 and chromaticity receiving photoelectric tube 52 can receive corresponding detected signal.
The upper covers of the light emitting device 3 and the light receiving device 5 are provided with a mounting shell 2, the mounting shell 2 comprises a shell 21 and a chassis 22, the shell 21 is provided with an operation display screen 1, and a limited space for placing a signal processing circuit board is reserved between the shell 21 and the chassis 22. The mounting housing 2 can protect the light emitting device 3 and the light receiving device 5, and prolong the service lives of the light emitting device 3 and the light receiving device 5. The signal processing circuit board can process the received light source signals and transmit and display the light source signals on the operation display screen 1, so that the light source signals are convenient to read.
The top of the housing 21 is provided with a yielding groove at one end far away from the operation display screen 1, and the light receiving device 5 and the light emitting device 3 are electrically connected with the operation display screen 1. The yielding groove is arranged to facilitate the putting in and taking out of the vessel to be tested.
The bottom of the light emitting device 3 and the bottom of the light receiving device 5 are provided with mounting bases 4, and the mounting bases 4 are connected with a chassis 22 through a plurality of supporting blocks 8.
An arc groove 6 is formed at the top of the light receiving device 5 and the top of the light emitting device 3, and the arc groove 6 corresponds to the position of the abdicating groove. The arc-shaped groove 6 is arranged, so that workers can conveniently take out the vessel to be tested to replace the sample.
Working principle: the water body is placed in the vessel to be measured, and the vessel to be measured is vertically inserted into the vessel accommodating cavity 9 to be measured during measurement. The DC-DC isolated stabilized voltage power supply supplies power, the constant current source PWM pulse drives the COD emission photoelectric tube 31 to work and emit ultraviolet light with specific wavelength to pass through the vessel to be detected, and the ultraviolet light sensitive photoelectric tube with specific wavelength is only subjected to photometric detection by using the interference filter, so that the influence of stray light can be avoided. And obtaining an initial signal of COD through a current-to-voltage circuit.
The constant current source PWM pulse drives the chromaticity emission photoelectric tube 32 to work and emit infrared light with specific wavelength to pass through the vessel to be tested, and the photoelectric tube sensitive to the infrared light with specific wavelength is only subjected to photometric detection by using the band interference filter, so that the influence of stray light is avoided. And obtaining a chromaticity initial signal through a current-to-voltage circuit.
The amplitude of the signal to be measured (COD or chromaticity) is measured by using a reference signal which has the same frequency and phase as the COD or chromaticity to be measured and multiplying the reference signal with the signal to be measured (COD or chromaticity) and using a low-pass filter to only keep a direct-current item.
A24-bit ultra-low noise Sigma-Delta analog-to-digital converter is used, a low-noise, ultra-low temperature drift and high-precision voltage reference source is used as a reference source of the analog-to-digital converter, the final COD and chromaticity values are obtained, and accurate numerical values are displayed on an operation display screen 1.
The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the content of the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.
Claims (7)
1. A high-precision chemical oxygen demand COD measuring instrument is characterized in that: comprises a band interference filter, a transmitting light device and a receiving light device; the device comprises a light emitting device, a receiving device and a container, wherein a to-be-tested vessel accommodating cavity is formed between the light emitting device and the receiving device, the light emitting device comprises a COD (chemical oxygen demand) light emitting photoelectric tube and a chromaticity light emitting photoelectric tube, the receiving device comprises a COD receiving photoelectric tube and a chromaticity light receiving photoelectric tube, and the COD light emitting photoelectric tube and the chromaticity light emitting photoelectric tube respectively correspond to the COD receiving photoelectric tube and the chromaticity light receiving photoelectric tube in position.
2. The high-precision Chemical Oxygen Demand (COD) meter according to claim 1, wherein: the light emitting device is detachably connected with the light receiving device, a plurality of first connecting seats are arranged on the connecting side of the light emitting device along the height direction of the light emitting device, a plurality of second connecting seats are arranged on the connecting side of the light receiving device along the height direction of the light receiving device, and the first connecting seats and the second connecting seats are fixedly locked and attached through screws.
3. The high-precision Chemical Oxygen Demand (COD) meter according to claim 1, wherein: the COD transmitting photoelectric tube and the chromaticity transmitting photoelectric tube are arranged along the height direction of the transmitting light device, square grooves are formed in the edges of the COD transmitting photoelectric tube and the chromaticity transmitting photoelectric tube, the COD receiving photoelectric tube and the chromaticity receiving photoelectric tube are arranged along the height direction of the receiving light device, and circular grooves are formed in the edges of the COD receiving photoelectric tube and the chromaticity receiving photoelectric tube.
4. The high-precision Chemical Oxygen Demand (COD) meter according to claim 1, wherein: the upper covers of the light emitting device and the light receiving device are provided with mounting shells, each mounting shell comprises a shell and a chassis, an operation display screen is assembled on the shell, and a limited space for placing a signal processing circuit board is reserved between the shell and the chassis.
5. The high-precision Chemical Oxygen Demand (COD) measuring instrument according to claim 4, wherein: and one end of the top of the shell, which is far away from the operation display screen, is provided with a yielding groove, and the light receiving device and the light emitting device are electrically connected with the operation display screen.
6. The high-precision Chemical Oxygen Demand (COD) measuring instrument according to claim 4, wherein: the bottom of the light emitting device and the bottom of the light receiving device are provided with mounting bases, and the mounting bases are connected with the chassis through a plurality of supporting blocks.
7. The high-precision Chemical Oxygen Demand (COD) measuring instrument according to claim 4, wherein: the tops of the light receiving device and the light emitting device are respectively provided with an arc-shaped groove, and the arc-shaped grooves correspond to the positions of the abdicating grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322045999.9U CN220455161U (en) | 2023-07-31 | 2023-07-31 | High-precision chemical oxygen demand COD measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322045999.9U CN220455161U (en) | 2023-07-31 | 2023-07-31 | High-precision chemical oxygen demand COD measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220455161U true CN220455161U (en) | 2024-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322045999.9U Active CN220455161U (en) | 2023-07-31 | 2023-07-31 | High-precision chemical oxygen demand COD measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220455161U (en) |
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2023
- 2023-07-31 CN CN202322045999.9U patent/CN220455161U/en active Active
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