Device for fully automatically judging COD (Chemical Oxygen Demand) concentration and use method thereof

Abstract

The invention discloses a device for full-automatically judging COD concentration and a using method thereof.The device comprises a COD rapid tester body, the right side of the COD rapid tester body is connected with a probe through a wire, the probe adopts a deep ultraviolet LED light source, the deep ultraviolet LED light source adopts a dual-wavelength or multi-wavelength absorption technology, and the probe is connected with a water pump through a water pump. Multi-parameter direct real-time compensation is realized, and the deep ultraviolet LED light source adopts a multi-wavelength coaxial light path design. Through the dual-wavelength or multi-wavelength absorption technology of the deep ultraviolet LED light source, the multi-wavelength coaxial light path design and measurement and the reference dual-channel measurement, the COD concentration is automatically calculated and compared with the preset threshold value in cooperation with the data processing unit, high and low concentration judgment can be completed without manual intervention, manual operation errors are reduced, the detection efficiency is greatly improved, and the detection cost is reduced. The protection limiting assembly provides stable protection for the COD rapid tester body through cooperation of a protection sleeve, a limiting block and a rubber gasket.

Description

Technical Field

[0001] This invention relates to the field of COD concentration determination technology, specifically to a fully automatic device for determining COD concentration and its usage method. Background Technology

[0002] Chemical oxygen demand (COD) is a core indicator for measuring the degree of organic pollution in water bodies. Its concentration directly reflects the water pollution status and plays an irreplaceable role in wastewater treatment, environmental monitoring, and drinking water safety. Currently, COD measuring instruments based on photometry are widely used in various water quality testing scenarios, but existing technologies still have the following limitations: Traditional COD measuring devices often require manual judgment of concentration range and manual switching of detection modes. Especially when conducting field or on-site testing, the operation steps are complex and prone to errors. Furthermore, they have poor adaptability and cannot meet the needs of rapid detection. The instruments are often used in complex environments, such as sewage treatment plants and riverbanks. Existing devices lack specific protective designs and are prone to failure due to collisions and moisture. At the same time, the storage and fixation of components such as probes and wires are inconvenient, affecting the efficiency of carrying and use and reducing portability. Summary of the Invention

[0003] The purpose of this invention is to provide a fully automatic device for determining high and low COD concentrations and its usage method, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a fully automatic device for determining high and low COD concentrations, comprising a COD rapid analyzer body, a probe connected to the right side of the COD rapid analyzer body via a wire, the probe employing a deep ultraviolet LED light source, the deep ultraviolet LED light source employing dual-wavelength or multi-wavelength absorption technology to achieve real-time compensation of multiple parameters, the deep ultraviolet LED light source employing a multi-wavelength coaxial optical path design, with each wavelength achieving dual-channel measurement for both measurement and reference, a display screen on the COD rapid analyzer body, a built-in atmospheric pressure sensor capable of real-time compensation, a built-in GPS module capable of recording measurement point coordinates in real time, a protective limiting component on the COD rapid analyzer body for protecting the COD rapid analyzer body, a positioning clamping component on the protective limiting component for limiting and fixing the probe, and a storage component on the positioning clamping component for storing the wire.

[0005] Preferably, the protective limiting component includes a protective sleeve, which is fitted onto the surface of the COD rapid analyzer body. Two baffles are installed on the inner wall of the protective sleeve and on the rear side of the COD rapid analyzer body. A fixing groove is provided on the left side of the inner wall of the protective sleeve.

[0006] Preferably, a movable limiting block is provided inside the fixing groove. The right side of the limiting block passes through the fixing groove and extends to its outside. A threaded rod that is threaded to the inner wall of the fixing groove is rotatably connected to the groove on the left side of the limiting block via a bearing. A rotating block is installed at the left end of the threaded rod that passes through the fixing groove and extends to its outside. A rubber gasket is installed on the right side of the rotating block and on the surface of the threaded rod.

[0007] Preferably, the positioning and clamping assembly includes a concave plate, which is installed on the right side of the protective sleeve and located on the side of the probe. A rubber block for use with the probe is installed on the left side of the inner wall of the concave plate.

[0008] Preferably, an arc-shaped clamping block is provided inside the concave plate and on the right side of the probe, and a pull rod is installed on the right side of the arc-shaped clamping block. The right end of the pull rod passes through the concave plate and extends to the outside of it, where a pull block is installed.

[0009] Preferably, two positioning rods are installed on the right side of the arc-shaped clamping block, and a positioning groove is provided on the right side of the inner wall of the concave plate corresponding to the position of the positioning rod. The right end of the positioning rod passes through the positioning groove and extends into it to slide in contact with the inner wall of the positioning groove. A spring is sleeved on the surface of the positioning rod.

[0010] Preferably, the storage assembly includes a storage shell, which is disposed above the concave plate. Top blocks are installed on both the left and right sides of the bottom of the storage shell. The bottom of the top blocks is fixedly connected to the top of the concave plate. An opening is provided on the front of the storage shell at the position corresponding to the wire.

[0011] Preferably, the front of the storage shell is provided with a sealing plate, and a locking block is installed at each of the four corners of the back of the sealing plate. A locking groove is opened on the front of the storage shell corresponding to the position of the locking block. The rear side of the locking block passes through the locking groove and extends into its interior to contact the inner wall of the locking groove.

[0012] Preferably, an iron block is installed on the back of the card block, a magnet that attracts the iron block is installed on the inner wall of the card slot, and a pull ring is installed on the front of the sealing plate.

[0013] A method for using a fully automatic device for determining high and low COD concentrations, the method being applicable to the aforementioned fully automatic device for determining high and low COD concentrations, specifically includes the following steps: S1. Device preparation: Check the connection status between the protective limit component and the COD rapid analyzer body. Rotate the rotating block to drive the threaded rod to rotate, so that the limit block is tightly attached to the COD rapid analyzer body to complete the fixation. Pull the pull block to the right to drive the arc-shaped clamp to compress the spring, so that the arc-shaped clamp separates from the probe and removes the probe from the concave plate. S2. Wire storage and removal: Open the sealing plate, put the wire into the storage shell through the opening, close the sealing plate so that the clip is inserted into the slot, and fix it by the attraction of the iron block and magnet. When in use, pull the pull ring to open the sealing plate and take out the wire. S3. Detection operation: Turn on the power of the COD rapid analyzer. After the device completes its self-test, immerse the probe into the water sample to be tested. The deep ultraviolet LED light source emits dual-wavelength or multi-wavelength light. The light signal is obtained through the multi-wavelength coaxial optical path and the measurement and reference dual channels. S4. Data Processing: Built-in atmospheric pressure sensor provides real-time compensation; data processing unit calculates COD concentration value based on light signal and compares it with preset threshold to determine high and low concentration range; GPS module records measurement point coordinates. S5. Results Viewing and Data Management: View COD concentration, high / low concentration judgment results and coordinate information on the display screen. Detection data is automatically stored and can be uploaded to external devices via USB. S6. End of test: After cleaning the probe, fix it with the positioning clamping assembly, store the wires in the storage shell, and turn off the power of the device.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention utilizes dual-wavelength or multi-wavelength absorption technology of deep ultraviolet LED light source, multi-wavelength coaxial optical path design and measurement, and reference dual-channel measurement. Combined with the data processing unit, it automatically calculates COD concentration and compares it with a preset threshold. High and low concentration can be determined without manual intervention, reducing human operation error and greatly improving detection efficiency. The protective limiting component provides stable protection for the COD rapid analyzer body through the cooperation of protective sleeve, limiting block and rubber gasket.

[0015] 2. The positioning and clamping assembly of this invention achieves rapid placement and secure fixation of the probe through the synergistic action of the concave plate, arc-shaped clamping block, spring and rubber block. The storage assembly utilizes a storage shell, sealing plate and magnetic structure to conveniently store wires and prevent tangling, solving the problem of scattered and inconvenient-to-carry components in traditional devices, improving adaptability to field or on-site testing, and enhancing portability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the rear view of the present invention; Figure 3 This is a three-dimensional structural diagram of the COD rapid analyzer body, wires, and probe of the present invention; Figure 4 This is a three-dimensional structural cross-sectional view of the protective limiting component of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the positioning clamping component and the storage component of the present invention; Figure 6 This is a three-dimensional structural diagram of the positioning and clamping component of the present invention; Figure 7 This is a three-dimensional cross-sectional view of the positioning and clamping component of the present invention; Figure 8 This is a three-dimensional structural diagram of the disassembled storage component of the present invention; Figure 9 This is a three-dimensional cross-sectional view of the storage component of the present invention.

[0017] In the diagram: 1. COD rapid analyzer body; 100. Wire; 101. Probe; 2. Protective limiting assembly; 21. Protective sleeve; 22. Baffle; 23. Fixing groove; 24. Limiting block; 25. Threaded rod; 26. Rotating block; 27. Rubber pad; 3. Positioning clamping assembly; 31. Concave plate; 32. Rubber block; 33. Arc-shaped clamping block; 34. Pull rod; 35. Pull block; 36. Positioning rod; 37. Positioning groove; 38. Spring; 4. Storage assembly; 41. Storage shell; 400. Top block; 42. Sealing plate; 43. Locking block; 44. Locking groove; 45. Iron block; 46. Magnet. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-9A fully automatic device for determining high and low COD concentrations includes a COD rapid analyzer body 1. The COD rapid analyzer body 1 serves as the control and data processing core of the device, integrating a display screen, data processing unit, power module, and various sensor interfaces. It is responsible for coordinating the detection process, calculating COD concentration, and determining the high and low concentration ranges. A probe 101 is connected to the right side of the COD rapid analyzer body 1 via a wire 100. The probe 101 uses a deep ultraviolet LED light source. The deep ultraviolet LED light source employs dual-wavelength or multi-wavelength absorption technology to achieve real-time compensation of multiple parameters. The deep ultraviolet LED light source adopts a multi-wavelength coaxial optical path design, enabling measurement of each wavelength. The COD rapid analyzer features dual-channel measurement for both quantity and reference. The main body 1 is equipped with a display screen and a built-in atmospheric pressure sensor for real-time compensation. It also includes a built-in GPS module that records the coordinates of measurement points in real time. The analyzer supports a full range of digital sensors and allows for USB data upload and online software upgrades. The built-in atmospheric pressure sensor enables real-time compensation, reducing the impact of environmental factors on the test results and ensuring accuracy. The GPS module records the coordinates of measurement points in real time, accurately linking the test data with the sampling location. The USB data upload function facilitates data traceability, analysis, and management, providing complete data support for environmental monitoring. The COD rapid analyzer body 1 features a 3.5-inch high-definition color TFT display with a resolution of 640*960, intuitively presenting concentration values, judgment results, and coordinate information. It has a built-in high-capacity replaceable rechargeable battery, providing at least 4 hours of continuous operation, and supports USB power adapter power supply to meet the needs of long-term field testing. The COD rapid analyzer body 1 employs a double injection molding process, and the outer layer uses a soft material for increased wear and impact resistance. The COD rapid analyzer body 1 features a low-power design, with standby power consumption as low as 0.05W. The probe 101 uses... Dual-wavelength and multi-wavelength absorption technology and multi-wavelength coaxial optical path design, combined with dual-channel measurement and reference, effectively eliminate optical path errors and improve detection accuracy. Imported long-life deep ultraviolet LED light source with a lifespan of >50,000 hours reduces maintenance frequency. With an IP68 protection rating, it can be directly immersed in water samples for stable operation and is suitable for humid and complex water quality environments. The measurement range and accuracy of probe 101 are as follows: COD range 0~600mg / L, resolution 0.01mg / L, turbidity range 0~1000NTU, temperature range 0~60℃, UV254 range 0~200Abs / m, single sample detection time <3 minutes, and calibration cycle 3 months.

[0020] A protective limiting component 2 is provided on the main body 1 of the COD rapid analyzer. The protective limiting component 2 is used to protect the main body 1 of the COD rapid analyzer. The protective limiting component 2 includes a protective sleeve 21, which is fitted onto the surface of the COD rapid analyzer body 1. The protective sleeve 21 is made of silicone, and its inner wall is in contact with the surface of the COD rapid analyzer body 1. Two baffles 22 are installed on the inner wall of the protective sleeve 21 and on the rear side of the COD rapid analyzer body 1. 2. The protective sleeve 22 is fixedly connected to the inner wall of the protective sleeve 21 by adhesive. The side of the baffle 22 near the COD rapid analyzer body 1 is in contact with the COD rapid analyzer body 1. By setting the baffle 22, the COD rapid analyzer body 1 is limited. A fixing groove 23 is opened on the left side of the inner wall of the protective sleeve 21. A movable limiting block 24 is set inside the fixing groove 23. The side of the limiting block 24 near the COD rapid analyzer body 1 is in contact with the COD rapid analyzer body 1. By setting the baffle 22 and the limiting block 24, the protective sleeve 21 is ensured to be fitted onto the COD rapid analyzer body 1. The stability of the surface of the speed measuring instrument body 1 is improved by the limiting block 24 and the baffle 22 forming a three-dimensional fixation in the front, back, left and right directions, enhancing the stability of the protective sleeve 21 covering the body. The right side of the limiting block 24 penetrates the fixing groove 23 and extends to its outside. A threaded rod 25, which is threaded to the inner wall of the fixing groove 23, is rotatably connected to the groove on the left side of the limiting block 24 via a bearing. The left end of the threaded rod 25 penetrates the fixing groove 23 and extends to its outside, where a rotating block 26 is installed. The surface of the limiting block 24 slides in contact with the inner wall of the fixing groove 23, so that the rotational force of the threaded rod 25 can be converted into a force that drives the limiting block 24 to move left and right, ensuring stability. To ensure the stability of the limiting block 24 during left and right movements, the two ends of the threaded rod 25 are fixedly connected to the limiting block 24 and the rotating block 26 by welding, respectively. A rubber pad 27 is installed on the right side of the rotating block 26 and on the surface of the threaded rod 25. The side of the rubber pad 27 closest to the protective sleeve 21 is in contact with the protective sleeve 21. By setting the rubber pad 27, the stability of the rotating block 26 when it is not in use is improved, thereby increasing the friction when in contact with the protective sleeve 21, preventing the threaded rod 25 from rotating on its own, and thus ensuring the limiting effect of the limiting block 24 on the COD rapid measuring instrument body 1.

[0021] A positioning clamping component 3 is provided on the protective limiting component 2. The positioning clamping component 3 is used to limit and fix the probe 101. The positioning clamping component 3 includes a concave plate 31, which is installed on the right side of the protective sleeve 21 and located on the side of the probe 101. The concave plate 31 is fixedly connected to the protective sleeve 21 by adhesive. The concave plate 31 provides a placement groove for the probe 101 and is fixed in conjunction with the clamping structure. A rubber block 32 for use with the probe 101 is installed on the left side of the inner wall of the concave plate 31. An arc-shaped clamping block 33 is provided inside the concave plate 31 and on the right side of the probe 101. The arc-shaped clamping block 33 is made of rubber. Because both the rubber block 32 and the arc-shaped clamping block 33 are made of rubber, the damage to the probe 101 during clamping is reduced, the clamping friction is increased, and the clamping stability is improved. The arc-shaped design fits the shape of the probe 101, improving the clamping firmness. A pull rod 34 is installed on the right side of block 33. The right end of pull rod 34 passes through concave plate 31 and extends to the outside of it, where a pull block 35 is installed. Two positioning rods 36 are installed on the right side of arc-shaped clamping block 33. A positioning groove 37 is opened on the right side of the inner wall of concave plate 31, corresponding to the position of the positioning rod 36. The right end of positioning rod 36 passes through positioning groove 37 and extends into it, making sliding contact with the inner wall of positioning groove 37. A spring 38 is sleeved on the surface of positioning rod 36. The two ends of the spring are connected to the inner wall of arc-shaped clamping block 33 and concave plate 31, respectively. Through the elastic force of spring 38, the arc-shaped clamping block 33 can stably clamp the probe 101. By pulling pull block 35, the arc-shaped clamping block 33 is driven to compress spring 38, realizing the rapid picking and putting of probe 101. The positioning rod 36 and positioning groove 37 cooperate to ensure the stable translation of arc-shaped clamping block 33 and avoid the phenomenon of displacement. The elastic coefficient of spring 38 is 5-15 N / mm.

[0022] The positioning clamping assembly 3 is equipped with a storage assembly 4 for storing the wire 100. The storage assembly 4 includes a storage shell 41, which is positioned above the concave plate 31. The storage shell 41 is used to store the wire 100, ensuring orderly storage to prevent tangling and reduce wear. The top block 400 raises the height of the storage shell 41 to avoid interference with the clamping structure of the probe 101 and optimize the spatial layout. The top of the probe 101 is in contact with the bottom of the storage shell 41. The storage shell 41 can be glued to install a winding post for easy winding and storage of the wire 100. Top blocks 400 are installed on both the left and right sides of the bottom of the storage shell 41, and the bottom of the top blocks 400 is fixedly connected to the top of the concave plate 31. An opening is provided on the front of the storage shell 41 corresponding to the position of the wire 100. A sealing plate 42 is provided on the front of the storage shell 41, and the back of the sealing plate 42 is in contact with the front of the storage shell 41. 2. Used to seal the storage shell 41 to prevent dust and moisture from entering the storage shell 41 and contaminating or damaging the wire 100, thus improving the protection of the wire 100 when carried. Each of the four corners of the back of the sealing plate 42 is equipped with a locking block 43. The front of the storage shell 41 is provided with a slot 44 corresponding to the position of the locking block 43. The rear side of the locking block 43 passes through the slot 44 and extends into it to contact the inner wall of the slot 44. The insertion and removal structure of the locking block 43 and the slot 44 facilitates quick opening and closing, improving the ease of operation. An iron block 45 is installed on the back of the locking block 43. A magnet 46 is installed on the inner wall of the slot 44 to attract the iron block 45. By setting the iron block 45 and the magnet 46, the stability of the locking block 43 when inserted into the slot 44 is ensured, thereby ensuring the stability of the connection between the sealing plate 42 and the storage shell 41. A pull ring is installed on the front of the sealing plate 42, which facilitates the opening or closing of the sealing plate 42.

[0023] A method for using a fully automatic device for determining high and low COD concentrations, applicable to such devices, specifically includes the following steps: S1. Device preparation: Check the connection status between the protective limiting component 2 and the COD rapid analyzer body 1. Rotate the rotating block 26 to drive the threaded rod 25 to rotate, so that the limiting block 24 is tightly attached to the COD rapid analyzer body 1 to complete the fixation. Pull the pull block 35 to the right, so that the arc-shaped clamping block 33 compresses the spring 38, so that the arc-shaped clamping block 33 separates from the probe 101 and the probe 101 is taken out from the concave plate 31. When the rotating block 26 is reversed, the rotating block 26 can drive the limiting block 24 to move to the left into the fixing groove 23 through the threaded rod 25, so that the limiting block 24 releases the limitation on the COD rapid analyzer body 1, making it convenient to take out the COD rapid analyzer body 1.

[0024] S2. Wire storage and removal: Open the sealing plate 42, put the wire 100 into the storage shell 41 through the opening, close the sealing plate 42 so that the card block 43 is inserted into the card slot 44, and is fixed by the attraction of the iron block 45 and the magnet 46. When in use, pull the pull ring to open the sealing plate 42 and take out the wire 100.

[0025] S3. Detection operation: Turn on the power of the COD rapid analyzer body 1. After the device completes the self-test, immerse the probe 101 into the water sample to be tested. The deep ultraviolet LED light source emits dual-wavelength or multi-wavelength light. The light signal is obtained through the multi-wavelength coaxial optical path and the measurement and reference dual channels.

[0026] S4. Data Processing: The built-in atmospheric pressure sensor provides real-time compensation. The data processing unit calculates the COD concentration value based on the light signal and compares it with the preset threshold to determine the high and low concentration range. The GPS module records the coordinates of the measurement point.

[0027] S5. Result Viewing and Data Management: View COD concentration, high and low concentration judgment results, and coordinate information on the display screen. The detection data is automatically stored and can be uploaded to external devices via USB.

[0028] S6. End of test: After cleaning the probe 101, fix it with the positioning clamping assembly 3, store the wire 100 in the storage shell 41, and turn off the power of the device.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fully automatic device for determining high and low COD concentrations, characterized in that: The device includes a COD rapid analyzer body (1), to which a probe (101) is connected via a wire (100) on the right side. The probe (101) uses a deep ultraviolet LED light source and employs dual-wavelength or multi-wavelength absorption technology to achieve direct real-time compensation of multiple parameters. The deep ultraviolet LED light source uses a multi-wavelength coaxial optical path design, with each wavelength achieving dual-channel measurement for both measurement and reference. The COD rapid analyzer body (1) is equipped with a display screen and has a built-in atmospheric pressure sensor. The atmospheric pressure sensor can realize… In real-time compensation, the COD rapid measuring instrument body (1) has a built-in GPS module, which can record the coordinate information of the measurement point in real time. The COD rapid measuring instrument body (1) is provided with a protective limiting component (2), which is used to protect the COD rapid measuring instrument body (1). The protective limiting component (2) is provided with a positioning clamping component (3), which is used to limit and fix the probe (101). The positioning clamping component (3) is provided with a storage component (4), which is used to store the wire (100).

2. The fully automatic device for determining high and low COD concentrations according to claim 1, characterized in that: The protective limiting component (2) includes a protective sleeve (21), which is fitted onto the surface of the COD rapid analyzer body (1). Two baffles (22) are installed on the inner wall of the protective sleeve (21) and located on the rear side of the COD rapid analyzer body (1). A fixing groove (23) is provided on the left side of the inner wall of the protective sleeve (21).

3. The fully automatic device for determining high and low COD concentrations according to claim 2, characterized in that: The fixed groove (23) is provided with a movable limiting block (24). The right side of the limiting block (24) passes through the fixed groove (23) and extends to its outside. The groove on the left side of the limiting block (24) is rotatably connected to the threaded rod (25) which is threaded to the inner wall of the fixed groove (23) by a bearing. The left end of the threaded rod (25) passes through the fixed groove (23) and extends to its outside, where a rotating block (26) is installed. A rubber gasket (27) is installed on the right side of the rotating block (26) and on the surface of the threaded rod (25).

4. The fully automatic device for determining high and low COD concentrations according to claim 3, characterized in that: The positioning clamping assembly (3) includes a concave plate (31), which is installed on the right side of the protective sleeve (21) and located on the side of the probe (101). A rubber block (32) for use with the probe (101) is installed on the left side of the inner wall of the concave plate (31).

5. The fully automatic device for determining high and low COD concentrations according to claim 4, characterized in that: An arc-shaped clamping block (33) is provided inside the concave plate (31) and on the right side of the probe (101). A pull rod (34) is installed on the right side of the arc-shaped clamping block (33). The right end of the pull rod (34) passes through the concave plate (31) and extends to the outside of it, where a pull block (35) is installed.

6. The fully automatic device for determining high and low COD concentrations according to claim 5, characterized in that: Two positioning rods (36) are installed on the right side of the arc-shaped clamp (33). A positioning groove (37) is provided on the right side of the inner wall of the concave plate (31) and at the position corresponding to the positioning rod (36). The right end of the positioning rod (36) passes through the positioning groove (37) and extends into it to slide in contact with the inner wall of the positioning groove (37). A spring (38) is sleeved on the surface of the positioning rod (36).

7. The fully automatic device for determining high and low COD concentrations according to claim 6, characterized in that: The storage component (4) includes a storage shell (41), which is located above the concave plate (31). Top blocks (400) are installed on the left and right sides of the bottom of the storage shell (41). The bottom of the top blocks (400) is fixedly connected to the top of the concave plate (31). An opening is provided on the front of the storage shell (41) at the position corresponding to the wire (100).

8. The fully automatic device for determining high and low COD concentrations according to claim 7, characterized in that: The front of the storage shell (41) is provided with a sealing plate (42), and a card block (43) is installed at each of the four corners of the back of the sealing plate (42). A card slot (44) is provided on the front of the storage shell (41) and at the position corresponding to the card block (43). The rear side of the card block (43) passes through the card slot (44) and extends into its interior to contact the inner wall of the card slot (44).

9. The fully automatic device for determining high and low COD concentrations according to claim 8, characterized in that: An iron block (45) is installed on the back of the card block (43), a magnet (46) that attracts the iron block (45) is installed on the inner wall of the card slot (44), and a pull ring is installed on the front of the sealing plate (42).

10. A method for using a fully automatic device for determining high and low COD concentrations, characterized in that, The method of use is applicable to the fully automatic device for determining high and low COD concentrations as described in any one of claims 1-9, and specifically includes the following steps: S1. Device preparation: Check the connection status between the protective limit component (2) and the COD rapid measuring instrument body (1). Rotate the rotating block (26) to drive the threaded rod (25) to rotate, so that the limit block (24) is tightly attached to the COD rapid measuring instrument body (1) to complete the fixation. Pull the pull block (35) to the right to drive the arc-shaped clamp (33) to compress the spring (38), so that the arc-shaped clamp (33) separates from the probe (101) and removes the probe (101) from the concave plate (31). S2. Wire storage and removal: Open the sealing plate (42), put the wire (100) into the storage shell (41) through the opening, close the sealing plate (42) so that the card block (43) is inserted into the card slot (44), and the iron block (45) and magnet (46) are attracted and fixed. When in use, pull the pull ring to open the sealing plate (42) and take out the wire (100). S3. Detection operation: Turn on the power of the COD rapid analyzer body (1). After the device completes the self-test, immerse the probe (101) into the water sample to be tested. The deep ultraviolet LED light source emits dual-wavelength or multi-wavelength light. The light signal is obtained through the multi-wavelength coaxial optical path and the measurement and reference dual channels. S4. Data Processing: Built-in atmospheric pressure sensor provides real-time compensation; data processing unit calculates COD concentration value based on light signal and compares it with preset threshold to determine high and low concentration range; GPS module records measurement point coordinates. S5. Results Viewing and Data Management: View COD concentration, high / low concentration judgment results and coordinate information on the display screen. Detection data is automatically stored and can be uploaded to external devices via USB. S6. End of test: After cleaning the probe (101), fix it with the positioning clamp assembly (3), store the wire (100) in the storage shell (41), and turn off the power of the device.

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