Self-sensing depth-control sampling adjusting device for surface water

Abstract

The invention discloses a sampling adjusting device for surface water self-sensing depth control, and belongs to the technical field of surface water sampling. The device comprises a water depth sensing module 100, a self-sensing control module 200, a sampling depth adjusting module 300 and a sampling module 400, the outer pipe of the device can be designed into different sizes and specifications, the outer pipe can be connected with a system in the floating body unit 202 through a detachable electric connection structure, and the surface water sampling requirements in various depth ranges can be met; according to an instruction, the real-time surface water depth and the preset depth range adjustment algorithm are obtained in combination with the sensor, sampling of a corresponding water layer is conducted on the surface water with the variable depth in real time, the obtained water sample meets the sampling requirement, and real-time performance and accuracy are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of surface water sampling, and in particular to a surface water self-sensing depth control sampling and regulating device. Background Art

[0002] Surface water refers to water on the ground, that is, water in rivers and lakes. Surface water sampling devices usually include automatic samplers, sensors, data acquisition systems and remote control systems. Automatic samplers automatically start water sample collection by preset time, flow or changes in water quality parameters to ensure the representativeness and accuracy of the samples. Sampling devices are usually equipped with high-precision sensors that can monitor the depth of water bodies in real time. Combined with wireless communication technology, the sampling device can achieve remote monitoring and control.

[0003] Although surface water sampling devices have a high level of automation and are easy to operate, they still have some shortcomings. First, the adaptability of existing automatic sampling devices in certain complex water environments is still limited. For example, floating objects, bottom mud or complex water flow conditions in the water body may affect the accuracy of sampling and the stability of the equipment. Especially in environments with deep water or drastic changes in water flow, the performance of existing devices may not meet the needs of high-precision sampling. Secondly, some automatic samplers have high maintenance costs and require regular replacement of consumables or equipment calibration. Especially in harsh environments, equipment maintenance and long-term reliability often become a major challenge. In addition, although many devices can be controlled through remote monitoring, due to the instability of the network environment or the delay in remote command response, the reliability of real-time control and data transmission still has hidden dangers, especially in some remote areas, where network coverage and data transmission stability become bottlenecks.

[0004] Therefore, it is necessary to design a new surface water self-sensing sampling and adjustment device with controlled depth so as to obtain surface water samples of the corresponding water layer more stably and accurately. Summary of the invention

[0005] In order to overcome the problems existing in the above technologies, the present invention provides a surface water self-sensing depth control sampling and adjustment device, the device comprising:

[0006] Water depth sensing module; self-sensing control module; sampling depth adjustment module; sampling module;

[0007] Among them, the water depth sensing module is connected to the self-sensing control module, and the water depth sensing module is used to detect the depth of the water body in real time through the water depth sensor;

[0008] Among them, the self-sensing control module and the water depth sensing module are connected to the sampling depth adjustment module, which are used to analyze the water depth detected by the water depth sensing module and automatically adjust the sampling depth; the self-sensing control module includes: a microcontroller unit and a floating unit; the microcontroller unit is a single-chip integrated circuit that integrates multiple functions including a central processing unit, an instruction receiver, a memory and a peripheral interface, which is used to analyze the water depth and adjust the sampling position according to the analysis results; the floating unit wraps the microcontroller unit, and the floating unit is an adaptive floating body. The floating unit is marked with a depth of 0, which is used to make the depth of 0 The scale is always at the same height as the surface of the surface water by inflation and exhaust.

[0009] Wherein, the sampling depth adjustment module and the self-sensing control module are connected to the sampling module, and are used to receive the sampling depth adjusted by the self-sensing control module, and coordinate the sampling module to sample at the corresponding depth according to the received sampling depth;

[0010] Among them, the sampling module is connected to the sampling depth adjustment module, and is used to perform corresponding depth sampling according to the depth coordinated by the sampling depth adjustment module; the sampling module is composed of an outer tube and an inner tube, the inner tube is located inside the outer tube, and multiple holes are equidistantly penetrated on one side of the outer tube and the inner tube, and multiple waterproof valves are arranged at the same position penetrating the outer tube and the inner tube through waterproof valves, and each waterproof valve is engraved with a mark of corresponding depth; the outer side of the waterproof valve is tightly connected with the hole of the outer tube, and the inner side of the waterproof valve is tightly connected with the hole of the inner tube at the corresponding position, and each tightly connected part is waterproofed; when the valve is closed, water cannot enter the outer tube and the inner tube; when the valve is opened, water flows into the inner tube through the depth corresponding to the opened valve, but does not flow into the part between the inner tube and the outer tube;

[0011] In addition, wires connected to each waterproof valve are arranged between the outer tube and the inner tube of the sampling module, and the closing of the valve is controlled by the wires; in addition to the depth marked on each waterproof valve, the outer tube is also marked with a scale of depth 0; the side of the outer tube close to the 0 scale is designed as a detachable electrical connection structure, and the other ends of all the wires are connected to the detachable electrical connection structure of the outer tube, the detachable electrical connection structure of the outer tube is connected to the microcontroller unit in the float unit, and the connecting part is waterproofed.

[0012] Specifically, the water depth sensor includes: an ultrasonic water depth sensor, a pressure water depth sensor and a sonar water depth sensor; the water depth sensor is used to accurately sense the depth of the water body in real time, and transmit the acquired water depth information to the self-sensing control module.

[0013] Specifically, the steps for analyzing the water depth detected by the water depth sensing module and automatically adjusting the sampling depth are as follows: first, the water depth sensing module combines the water depth data with the preset depth range adjustment algorithm to obtain the adjusted depth range; second, the average depth of the adjusted depth range is obtained, and the distance between the average depth and the corresponding depth of the waterproof valve in the sampling module is calculated; finally, the depth of the waterproof valve in the sampling module with the smallest distance from the average depth is used as the final adjusted sampling depth; the preset depth range adjustment algorithm refers to an algorithm for adjusting the sampling depth range according to the influence of water depth changes on water body sampling; the preset depth range is the sampling depth range determined before the surface water depth changes according to the type of water body, sampling purpose and specific water quality detection requirements; the preset depth range adjustment algorithm formula is:

[0014]

[0015] Among them, L 2 To monitor the water depth in real time, L 1 is the water depth at the beginning of sampling, L 1 is a fixed value, the sampling depth corresponds to the preset depth range, I 1 is the preset depth range, I 2 is the adjusted depth range.

[0016] Specifically, the float unit is equipped with an automatic gas regulating device and a water level sensor, which monitors the position of the 0 scale of the float unit relative to the water surface through the water level sensor; if the 0 scale of the float unit is below the water surface, the automatic gas regulating device inflates until the 0 scale of the float unit is at the same height as the water surface; if the 0 scale of the float unit is above the water surface, the automatic gas regulating device deflates until the 0 scale of the float unit is at the same height as the water surface.

[0017] Specifically, according to the sampling depth finally adjusted by the self-sensing control module, the closure of the valve switch corresponding to the finally adjusted sampling depth is adjusted to coordinate the sampling module to sample at the corresponding depth; the sampling depth adjustment module is designed as a valve control system and is arranged in the floating unit.

[0018] Specifically, a plurality of outer tubes of different sizes and specifications are designed at the same time, and they are combined with inner tubes of corresponding sizes and specifications to form a complete sampling module, that is, sampling modules of different specifications are formed; outer tubes of appropriate sizes and rules are selected according to the water quality, depth and historical depth change information of the surface water to be sampled, and the detachable electrical connection structure of the outer tube of the sampling module is installed on the valve control system of the floating unit to form a complete sampling device. At this time, the 0 scale of the outer tube is just on the same horizontal plane as the 0 scale of the floating unit; the complete sampling device is put vertically downward into the corresponding water area of ​​the surface water to be tested with the non-electrically connected structure end of the outer tube. When the complete sampling device is balanced in the water, the floating unit will automatically adjust the 0 scale to be the same height as the water surface. At this time, the depth mark engraved on each waterproof valve completely corresponds to the water depth; when the surface water is sampled for the first time before the depth of the surface water changes, the average depth of the preset depth range is obtained, and the average depth is calculated by calculating the average depth and each waterproof valve. The distance of the valve corresponding to the depth, the depth of the waterproof valve with the smallest distance to the average depth is taken as the final adjusted sampling depth, and the valve corresponding to the final adjusted sampling depth is controlled to open through the sampling depth adjustment module, and the water of the corresponding depth through the opened valve enters the inner tube; then, the valve is closed, and the complete sampling device is taken out of the water, the outer tube is disassembled, and any valve is opened to complete the sampling; secondly, after the sampling is completed, the sampling device is continued to be placed in the corresponding area of ​​the surface water to be sampled, and when sampling is required, a sampling instruction is issued to the microcontroller unit, and the microcontroller unit will obtain the final adjusted sampling depth according to the real-time acquired surface water depth, and then determine the valve corresponding to the final adjusted sampling depth, and control the corresponding valve of the sampling module to open for water sampling through the sampling depth adjustment module; then, the valve is closed, and the complete sampling device is taken out of the water, the outer tube is disassembled, and any valve is opened to complete the sampling.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a sampling and adjustment device for self-sensing and controlling the depth of surface water, which has the following advantages: 1) the outer tube of the sampling device designed by the present invention can be designed to be of different sizes and specifications, and the outer tube can be connected to the system in the floating unit through a detachable electrical connection structure, so as to meet the surface water sampling requirements in various depth ranges; 2) the 0 scale line of the floating unit of the present invention is always at the same height as the water surface, so that the scale lines of multiple valves on the underwater outer tube accurately correspond to the water depth, and the depth of sampling through the corresponding valve will be more accurate; 3) the present invention can obtain the real-time surface water depth and the preset depth range adjustment algorithm according to instructions in combination with sensors, and sample the corresponding water layer of the surface water with changing depth in real time, and the water samples obtained meet the sampling requirements and have real-time and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of a sampling and adjustment device for self-sensing and controlling depth of surface water according to the present invention. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given here are only used to illustrate and explain the present invention, and cannot be used to limit the present invention.

[0023] like Figure 1 Shown is a schematic diagram of a surface water self-sensing depth control sampling and adjustment device of the present invention; the schematic diagram includes: a water depth sensor module 100; a self-sensing control module 200; a sampling depth adjustment module 300; a sampling module 400; and a microcontroller unit 201 and a float unit 202.

[0024] Among them, the water depth sensing module 100 and the self-sensing control module 200 are connected, and the water depth sensing module 100 is used to detect the depth of the water body in real time through a water depth sensor; specifically, the water depth sensor can adopt an ultrasonic water depth sensor, a pressure water depth sensor and a sonar water depth sensor, etc.; the water depth sensor is used to accurately sense the depth of the water body in real time, and the acquired water depth information is transmitted to the self-sensing control module 200.

[0025] Among them, the self-sensing control module 200 and the water depth sensor module 100 are connected to the sampling depth adjustment module 300, which are used to analyze the water depth detected by the water depth sensor module 100 and automatically adjust the sampling depth; the self-sensing control module 200 includes: a microcontroller unit 201 and a floating unit 202; the microcontroller unit 201 is a single-chip integrated circuit integrating multiple functions including a central processing unit, an instruction receiver, a memory and a peripheral interface, which is used to analyze the water depth and adjust the sampling position according to the analysis results; the floating unit 202 wraps the microcontroller unit 201, and the floating unit 202 is an adaptive floating body. The floating unit 202 is marked with a depth of 0, which is used to make the depth of 0 The scale is always at the same height as the surface of the surface water by inflation and exhaust; specifically, the self-sensing control module 200 is used to adjust the water depth. The steps of analyzing the water depth detected by the depth sensing module 100 and automatically adjusting the sampling depth are as follows: first, the water depth sensing module 100 combines the water depth data with the preset depth range adjustment algorithm to obtain the adjusted depth range; second, the average depth of the adjusted depth range is obtained, and the distance between the average depth and the corresponding depth of the waterproof valve in the sampling module 400 is calculated; finally, the depth of the waterproof valve in the sampling module 400 with the smallest distance from the average depth is used as the final adjusted sampling depth; the preset depth range adjustment algorithm refers to an algorithm for adjusting the sampling depth range according to the influence of water depth changes on water body sampling; the preset depth range is the sampling depth range determined according to the type of water body, sampling purpose and specific water quality detection requirements before the surface water depth changes; the preset depth range adjustment algorithm formula is:

[0026]

[0027] Among them, L 2 To monitor the water depth in real time, L 1 is the water depth at the beginning of sampling, L 1 is a fixed value, the sampling depth corresponds to the preset depth range, I 1 is the preset depth range, I 2 is the adjusted depth range.

[0028] Furthermore, the float unit 202 is an adaptive float, and is equipped with an automatic gas regulating device and a water level sensor inside the float unit 202. The water level sensor monitors the position of the 0 mark of the float unit 202 relative to the water surface; if the 0 mark of the float unit 202 is below the water surface, the automatic gas regulating device inflates until the 0 mark of the float unit 202 is at the same height as the water surface; if the 0 mark of the float unit 202 is above the water surface, the automatic gas regulating device deflates until the 0 mark of the float unit 202 is at the same height as the water surface.

[0029] In the above embodiment, specifically, the adjusted depth range is determined as follows: Assuming that according to the analysis of the surface water sampling area, the preset depth range is between 4 and 6 meters, that is, the preset depth range is: [4, 6] The original depth of the surface water is 10 meters, and the surface water depth becomes 12 meters when the water level rises, then it is calculated by the formula:

[0030] The adjusted depth range becomes between 4.8 meters and 7.2 meters.

[0031] Among them, the sampling depth adjustment module 300 and the self-sensing control module 200 are connected to the sampling module 400, and are used to receive the sampling depth adjusted by the self-sensing control module 200, and coordinate the sampling module 400 to sample at the corresponding depth according to the received sampling depth; specifically, according to the sampling depth finally adjusted by the self-sensing control module 200, the closing of the valve switch corresponding to the finally adjusted sampling depth is adjusted to coordinate the sampling module 400 to sample at the corresponding depth; the sampling depth adjustment module 300 is designed as a valve control system and is arranged in the float unit 202.

[0032] Among them, the sampling module 400 is composed of an outer tube and an inner tube, the inner tube is located inside the outer tube, and multiple holes are equidistantly penetrated on one side of the outer tube and the inner tube. Through the waterproof valve, multiple waterproof valves are arranged at the same position penetrating the outer tube and the inner tube, and each waterproof valve is engraved with a mark of corresponding depth; the outer side of the waterproof valve is tightly connected with the hole of the outer tube, and the inner side of the waterproof valve is tightly connected with the hole of the inner tube at the corresponding position, and each tightly connected part is waterproofed; when the valve is closed, water cannot enter the outer tube and the inner tube; when the valve is opened, water flows into the inner tube through the depth corresponding to the opened valve, but does not flow into the part between the inner tube and the outer tube.

[0033] In addition, wires connected to each waterproof valve are arranged between the outer tube and the inner tube, and the closing of the valve is controlled by the wires; in addition to the depth marked on each waterproof valve, the outer tube is also marked with a scale of depth 0; the side of the outer tube close to the 0 scale is designed as a detachable electrical connection structure, and the other ends of all the wires are connected to the detachable electrical connection structure of the outer tube, and the detachable electrical connection structure of the outer tube is connected to the microcontroller unit 201 in the float unit 202, and the connecting part is waterproofed.

[0034] In the above embodiment, specifically, a plurality of outer tubes of different sizes and specifications can be designed at the same time, and together with the inner tubes of corresponding sizes and specifications, a complete sampling module 400 is formed, that is, sampling modules of different specifications are formed; an outer tube of appropriate size and regularity is selected according to the water quality, depth and historical depth change information of the surface water to be sampled, and the detachable electrical connection structure of the outer tube of the sampling module is installed on the valve control system of the floating unit 202 to form a complete sampling device. At this time, the 0 scale of the outer tube is just on the same horizontal plane as the 0 scale of the floating unit 202; the complete sampling device is put into the corresponding water area of ​​the surface water to be measured in a vertically downward manner with the non-electrically connected structure end of the outer tube. When the complete sampling device is balanced in the water, the floating unit 202 will automatically adjust the 0 scale to be equal to the water surface. At this time, the depth mark engraved on each waterproof valve completely corresponds to the water depth; when the surface water is sampled for the first time before the depth of the surface water changes, the average depth of the preset depth range is obtained, and the average depth and The distance between the corresponding depths of each waterproof valve is taken as the depth of the waterproof valve with the smallest distance to the average depth as the final adjusted sampling depth. The sampling depth adjustment module 300 controls the valve corresponding to the final adjusted sampling depth to open, and the water of the corresponding depth through the opened valve enters the inner tube; then, the valve is closed, and the complete sampling device is taken out of the water, the outer tube is disassembled, and any valve is opened to complete the sampling; secondly, after the sampling is completed, the sampling device is continued to be placed in the corresponding area of ​​the surface water to be sampled. When sampling is required, a sampling instruction is sent to the microcontroller unit 201, and the microcontroller unit 201 will obtain the final adjusted sampling depth according to the real-time acquired surface water depth, and then determine the valve corresponding to the final adjusted sampling depth, and the sampling depth adjustment module 300 controls the corresponding valve of the sampling module 400 to open for water sampling; then, the valve is closed, and the complete sampling device is taken out of the water, the outer tube is disassembled, and any valve is opened to complete the sampling.

Claims

1. A surface water self-sensing depth control sampling and adjustment device, characterized in that: The device comprises: A water depth sensing module (100); A self-sensing control module (200); Sampling depth adjustment module (300); Sampling module (400); The water depth sensing module (100) is connected to the self-sensing control module (200), and the water depth sensing module (100) is used to detect the depth of the water body in real time through a water depth sensor; The self-sensing control module (200) and the water depth sensing module (100) are connected to the sampling depth adjustment module (300) and are used to analyze the water depth detected by the water depth sensing module (100) and automatically adjust the sampling depth; the self-sensing control module (200) comprises: a microcontroller unit (201) and a floating unit (202); the microcontroller unit (201) is used to analyze the water depth and adjust the sampling position according to the analysis result; the floating unit (202) wraps the microcontroller unit (201), the floating unit (202) is an adaptive floating body, and a scale with a depth of 0 is marked on the floating unit (202), which is used to make the scale with a depth of 0 always equal to the water surface of the surface water by means of inflation and deflation; The sampling depth adjustment module (300) and the self-sensing control module (200) are connected to the sampling module (400) and are used to receive the sampling depth adjusted by the self-sensing control module (200), and coordinate the sampling module (400) to sample at a corresponding depth according to the received sampling depth; The sampling module (400) is connected to the sampling depth adjustment module (300) and is used to perform sampling at a corresponding depth according to the depth coordinated by the sampling depth adjustment module (300); the sampling module (400) is composed of an outer tube and an inner tube, the inner tube is located inside the outer tube, a plurality of holes are equidistantly penetrated on one side of the outer tube and the inner tube, a plurality of waterproof valves are arranged at the same position penetrating the outer tube and the inner tube, and each waterproof valve is engraved with a mark of a corresponding depth; wires are arranged between the outer tube and the inner tube to connect the waterproof valves respectively, and the closing of the valves is controlled by the wires.

2. A surface water self-sensing depth control sampling and adjustment device according to claim 1, characterized in that: The water depth sensor comprises an ultrasonic water depth sensor, a pressure water depth sensor and a sonar water depth sensor; the water depth sensor is used to accurately sense the depth of the water body in real time, and the acquired water depth information is transmitted to the self-sensing control module (200).

3. A surface water self-sensing depth control sampling and adjustment device according to claim 1, characterized in that: The method for analyzing the water depth detected by the water depth sensing module (100) and automatically adjusting the sampling depth comprises: firstly, the water depth sensing module (100) combines the water depth data with a preset depth range adjustment algorithm to obtain an adjusted depth range; secondly, obtaining the average depth of the adjusted depth range, and calculating the distance between the average depth and the corresponding depth of the waterproof valve in the sampling module (400); finally, taking the depth of the waterproof valve in the sampling module (400) with the smallest distance from the average depth as the final adjusted sampling depth; the preset depth range adjustment algorithm refers to an algorithm for adjusting the sampling depth range according to the influence of water depth changes on water body sampling; the preset depth range is a sampling depth range determined before the surface water depth changes according to the type of water body, sampling purpose and specific water quality detection requirements; the preset depth range adjustment algorithm formula is: Among them, L2 is the water depth obtained by real-time monitoring, L1 is the water depth at the beginning of sampling, L1 is a constant, the sampling depth corresponds to the preset depth range, I1 is the preset depth range, and I2 is the adjusted depth range.

4. A surface water self-sensing depth control sampling and adjustment device according to claim 1, characterized in that: The microcontroller unit (201) is a single-chip integrated circuit that integrates multiple functions including a central processing unit, a command receiver, a memory, and a peripheral interface; the float unit (202) is an adaptive float including: the float unit (202) is equipped with an automatic gas regulating device and a water level sensor, and the position of the 0 scale of the float unit (202) relative to the water surface is monitored by the water level sensor; if the 0 scale of the float unit (202) is below the water surface, the automatic gas regulating device is inflated until the 0 scale of the float unit (202) is at the same height as the water surface; if the 0 scale of the float unit (202) is above the water surface, the automatic gas regulating device is deflated until the 0 scale of the float unit (202) is at the same height as the water surface.

5. The surface water self-sensing depth control sampling and adjustment device according to claim 1 is characterized in that: The sampling depth adjustment module (300) comprises: according to the sampling depth finally adjusted by the self-sensing control module (200), a closed coordination sampling module (400) is adjusted to adjust the valve switch corresponding to the finally adjusted sampling depth to sample at the corresponding depth; the sampling depth adjustment module (300) is designed as a valve control system and is arranged in the floating unit (202).

6. The surface water self-sensing depth control sampling and adjustment device according to claim 1 is characterized in that: The sampling module (400) comprises: the outer side of the waterproof valve is tightly connected to the hole of the outer tube, the inner side of the waterproof valve is tightly connected to the hole of the inner tube at the corresponding position, and each tightly connected part is waterproofed; when the valve is closed, water cannot enter the outer tube and the inner tube; when the valve is opened, water flows into the inner tube through the depth corresponding to the opened valve, but does not flow into the area between the inner tube and the outer tube.

7. The surface water self-sensing depth control sampling and adjustment device according to claim 1 is characterized in that: The sampling module (400) further comprises: in addition to the depth marked on each waterproof valve, the outer tube is also marked with a scale of depth 0; the side of the outer tube close to the scale 0 is designed as a detachable electrical connection structure, the other ends of all the wires are connected to the detachable electrical connection structure of the outer tube, the detachable electrical connection structure of the outer tube is connected to the microcontroller unit (201) in the float unit (202), and the connection part is waterproofed; at the same time, multiple outer tubes of different sizes and specifications are designed, and together with inner tubes of corresponding sizes and specifications, a complete sampling module (400) is formed, that is, sampling modules of different specifications are formed; according to the sample to be sampled, The water quality, depth and historical depth change information of the sampled surface water are selected to select an outer tube of appropriate size and regularity, and the detachable electrical connection structure of the outer tube of the sampling module is installed on the valve control system of the floating unit (202) to form a complete sampling device. At this time, the 0 scale of the outer tube is exactly on the same horizontal plane as the 0 scale of the floating unit (202); the complete sampling device is placed vertically downward with the non-electrically connected structure end of the outer tube into the corresponding water area of ​​the surface water to be tested. When the complete sampling device is balanced in the water, the floating unit (202) will automatically adjust the 0 scale to be equal to the water surface. At this time, the 0 scale engraved on each waterproof valve is The depth mark completely corresponds to the water depth; when sampling the surface water for the first time before the surface water depth changes, the average depth of the preset depth range is calculated, and the distance between the average depth and the corresponding depth of each waterproof valve is calculated, and the depth of the waterproof valve with the smallest distance from the average depth is used as the final adjusted sampling depth. The valve corresponding to the final adjusted sampling depth is controlled to open by the sampling depth adjustment module (300), and the water corresponding to the depth of the opened valve enters the inner tube; then, the valve is closed, and the complete sampling device is taken out of the water, the outer tube is disassembled, and any valve is opened to complete the sampling. ; Secondly, after the sampling is completed, the sampling device is placed in the corresponding area of ​​the surface water to be sampled. When sampling is required, a sampling instruction is sent to the microcontroller unit (201). The microcontroller unit (201) will obtain the final adjusted sampling depth based on the surface water depth obtained in real time, and then determine the valve corresponding to the final adjusted sampling depth. The sampling depth adjustment module (300) controls the corresponding valve of the sampling module (400) to open for water sampling; then, the valve is closed, and the complete sampling device is taken out of the water, the outer tube is removed, and any valve is opened to complete the sampling.

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