KR102644791B1 - Apparatus For Measuring Quality Of Water By Depth And Measuring Method - Google Patents

Abstract

The present invention relates to a water quality measurement device for measuring water quality by depth and a water quality measurement method using the same, and more specifically, to a water quality sensor for measuring water quality; A cable connected to the water quality sensor at one end and having a predetermined length for transmitting data measured by the water quality sensor; and a winch for accommodating the cable, but equipped with a tension adjustment function to maintain the tension of the cable within a predetermined range. will be.

Description

Water quality measurement device and water quality measurement method by depth equipped with cable tension control function {Apparatus For Measuring Quality Of Water By Depth And Measuring Method}

The present invention relates to a water quality measurement device by depth and a water quality measurement method using the same. More specifically, a water quality measurement device by depth that can track and observe the water quality of groundwater by depth and changes in the salt water interface in real time and unmanned, and a water quality measurement method using the same. It is about water quality measurement methods.

The fresh-saltwater interface is an interface formed by the concentration difference between freshwater and seawater in the ground. It has characteristics that change in real time due to artificial or natural changes such as rainfall, groundwater pumping, dam opening, or increase in sea water.

The existing method of observing the fresh-salt water interface involves installing a sensor at a specific depth to observe electrical conductivity over time or observing changes in vertical electrical conductivity at a specific time. This method had a problem in that there was no way to respond if the fresh-salt water interface was different from the location where the sensor was installed. The method of responding to this problem has the disadvantage that managers have no choice but to visit the site and manually find the changed salt-salt water interface.

Korea Patent Publication No. 2019-0045538

The present invention was developed to solve the above-mentioned problems, and provides a water quality measurement device by depth that can accurately measure and observe water quality by depth even if the water quality by depth changes due to various external factors and a water quality measurement method using the same. The purpose is to

In addition, the purpose of the present invention is to provide a water quality measurement device by depth that can check the water level and changes at the salt-salt water interface from a distance without an observer visiting the site, and a water quality measurement method using the same.

In addition, the purpose of the present invention is to provide a water quality measurement device for each depth that can raise and lower a cable connected to a water quality sensor at a constant speed and a water quality measurement method using the same.

In order to solve the above problems, the water quality measuring device by depth equipped with the tension control function of the present invention is a water quality measuring device for measuring water quality by depth, and includes a water quality sensor 100 for measuring water quality; A cable 200 connected to one end of the water quality sensor 100 and having a predetermined length for transmitting data measured by the water quality sensor 100; and a winch 300 for accommodating the cable 200, wherein the winch 300 includes a case 310 having a predetermined shape, a control unit 320 for controlling the operation of the cable 200, and the cable. A cable drum (330) that operates to wind or unwind (200) and is equipped with a function to measure rotational speed. It is located at a predetermined distance from the cable drum (330) and has a smaller outer diameter than the cable drum (330). A first roller 341 equipped with a function for measuring rotational speed, and two second rollers located facing each other near the outer edge of the first roller 341 and having a smaller outer diameter than the first roller 341. (342), and a roller 340 including a third roller 343 located below the first roller 341, spaced a predetermined distance from the first roller 341, and equipped with a tension measurement sensor, a cable ( A guide plate 360 for guiding the moving path of the cable 200, and a path changer 370 located between the third roller 341 and the cable drum 330 to change the path of the cable 200. Includes, the guide plate 360 is located behind the third roller 343, and the cable 200 is between the first roller 341 and the second roller 342, the first roller 341 ) and the guide plate 360, the third roller 343, the path changer 370, and the cable drum 330 are mounted to move in that order, and the first roller 341 is equipped with a first drive motor 391. ) is connected, and a second drive motor 392 is connected to the cable drum 330 to maintain the set winding speed of the first roller 341 and the set tension value of the third roller 343. It is characterized by being controlled to adjust the rotation speed of (330).
In addition, in the water quality measurement device by depth equipped with the tension control function of the present invention, the winch 300 is further provided with an exhaust unit 350 for removing moisture attached to the cable 200. .
In addition, in the water quality measurement device by depth equipped with the tension control function of the present invention, the exhaust part 350 includes a pair of first body parts 351 and a second body part positioned facing each other with the cable 200 interposed. It includes a second body portion 353, wherein the first body portion 351 includes a first storage groove 351(a) recessed to a predetermined depth and a first storage groove 351(a) located below the first storage groove 351(a). It includes 1 slit (351(b)), the first storage groove (351(a)) accommodates the first exhaust fan 352, and the second body portion 353 is recessed to a predetermined depth. It includes a storage groove 353(a) and a second slit 353(b) located above the second storage groove 353(a), and the second storage groove 353(a) includes a second slit 353(b). 2 It is characterized in that an exhaust fan 354 is stored.
In addition, in the water quality measurement device by depth equipped with the tension control function of the present invention, a limit sensor 380 for controlling the position of the cable 200 is further provided inside the winch 300.
In addition, in the depth-specific water quality measurement device equipped with the tension control function of the present invention, a sensor trigger 210 is installed near one end of the cable 200 connected to the water quality sensor 100.
In addition, the method of measuring water quality by depth of the present invention includes the steps of (S1) lowering the cable 200 connected to the water quality sensor 100 into an observation hole; (S2) measuring water quality by the water quality sensor 100 and storing the measured water quality results in the control unit 320; and (S3) raising the cable 200 connected to the water quality sensor 100 from the observation hole. However, in the step (S1), the cable 200 is stopped at a predetermined position for a predetermined period of time and then lowered again.

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Additionally, in the method for measuring water quality by depth of the present invention, steps (S1) to (S3) are characterized in that they are repeated multiple times at predetermined intervals.

The device for measuring water quality by depth of the present invention has the advantage of being able to accurately measure the ascending and descending distance of the cable, thereby increasing the reliability of the measurement results, as it has the function of constantly adjusting the tension of the cable.

In addition, the depth-specific water quality measurement device of the present invention has the advantage of reducing measurement and management costs because it can be remotely controlled and managed.

In addition, the water quality measurement method using the water quality measurement device by depth of the present invention has the advantage of not only being able to accurately measure various water qualities at the corresponding depth, but also easily tracking and observing changes in the fresh-salt water interface.

Figure 1 is a perspective view of a water quality measuring device according to a preferred embodiment of the present invention as seen from one direction.
Figure 2 is a perspective view of the water quality measuring device according to a preferred embodiment of the present invention as seen from the other direction.
Figure 3 is a perspective view of the water quality measuring device according to a preferred embodiment of the present invention as seen from the rear with a portion of the case excluded.
Figure 4 is an internal cross-sectional view of a water quality measuring device according to a preferred embodiment of the present invention.
Figure 5 is an internal perspective view of a water quality measuring device according to a preferred embodiment of the present invention.
Figure 6 is an enlarged perspective view of the control unit of the water quality measuring device according to a preferred embodiment of the present invention.
Figure 7 is a diagram for explaining the operation of the roller in the water quality measuring device according to a preferred embodiment of the present invention.
Figure 8 is a diagram for explaining a drive motor for driving a roller and a cable drum in a water quality measuring device according to a preferred embodiment of the present invention.
Figure 9 is an algorithm for explaining how cable tension is controlled by rollers and cable drums in the water quality measurement device according to the preferred embodiment of the present invention.
Figure 10 is an exploded perspective view of the blower part in the water quality measuring device according to a preferred embodiment of the present invention.
Figure 11 is a front view of the body part constituting the exhaust part in the water quality measuring device according to a preferred embodiment of the present invention.
Figure 12 is a block diagram configuring a control unit of a water quality measuring device according to a preferred embodiment of the present invention.
Figure 13 is a flowchart for explaining a method of measuring water quality using a water quality measuring device according to a preferred embodiment of the present invention.

In this application, terms such as “comprise,” “have,” or “equipped with” are intended to designate the presence of features, numbers, steps, components, parts, or combinations thereof described in the specification, and are not intended to indicate the presence of one or more other features, numbers, steps, components, parts, or combinations thereof. It should be understood that this does not exclude in advance the possibility of the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between. Other expressions that describe the relationship between components, such as "between" and "immediately between" or "neighboring" and "directly adjacent to" should be interpreted similarly.

Hereinafter, the water quality measuring device and water quality measuring method for measuring water quality by depth according to the present invention will be described with reference to the attached drawings. The same reference numerals are used for the same components in the drawings, and duplicate descriptions for the same components are omitted.

Figure 1 is a perspective view of a water quality measuring device according to a preferred embodiment of the present invention as seen from one direction, and Figure 2 is a perspective view of a water quality measuring device according to a preferred embodiment of the present invention as seen from the other direction.

When described with reference to FIGS. 1 and 2, the water quality measuring device according to the present invention includes a water quality sensor 100, a cable 200, and a winch 300.

First, the water quality sensor 100 may be a salinity recorder sensor that measures the quality of groundwater, for example, electrical conductivity and water temperature, and is also a sensor that can check the salt concentration by water depth by simultaneously measuring the water depth.

The cable 200 is used to transmit data measured by the water quality sensor 100 in a wired manner and to support the water quality sensor 100. The water quality sensor 100 is connected to one end and the other end is connected to the winch 300. It is done.

Here, the cable 200 may be a copper wire or an optical cable, and is preferably an optical cable. In the present invention, the cable 200 to which the water quality sensor 100 is connected can have an observation length of hundreds of meters, and therefore, when using an optical cable, energy loss is lower than that of a copper wire, making it suitable for long-distance transmission, and the amount of information that can be transmitted is There are many, and it also has the advantage of not receiving electrical or magnetic interference from surrounding cables.

Meanwhile, it is preferable that a sensor trigger 210 is provided near one end of the cable 200 connected to the water quality sensor 100 to help confirm the rising position of the water quality sensor 100, and this will be described later. .

Figure 3 is a perspective view of the water quality measuring device according to a preferred embodiment of the present invention as seen from the rear with a portion of the case excluded, Figure 4 is an internal cross-sectional view of the water quality measuring device according to a preferred embodiment of the present invention, and Figure 5 is a view of the water quality measuring device according to a preferred embodiment of the present invention. This is an internal perspective view of a water quality measuring device according to a preferred embodiment.

Referring to FIGS. 1 to 5 together, the winch 300 is used to raise or lower the cable 200 at a constant speed into an observation hole installed at a point where groundwater measurement is required, and includes the case 310, the control unit 320, and the cable. It consists of a drum 330, a roller 340, an exhaust unit 350, a guide plate 360, a path change unit 370, a limit sensor 380, and a drive motor.

To explain in more detail, the case 310 having a predetermined shape is designed to protect various parts provided inside from external shock. In particular, a handle 311 is provided on the upper surface of the case 310 so that the operator can easily hold and move it. It is desirable to have it in place.

The control unit 320 performs the function of allowing the operator to directly operate the various parts constituting the cable 200 and the winch 300 from a remote or close range, while transmitting data transmitted from the cable 200 to the control center. For this purpose, it is mounted exposed to the outside of the case 310. Of course, the control unit 320 controls only the operation of the cable 200 and the winch 300, and it is also possible to provide a separate data transmission unit for transmitting the collected data.

To be described in more detail with reference to FIG. 6 , which is an enlarged perspective view of the control unit of the water quality measuring device according to a preferred embodiment of the present invention, the control unit 320 having the above-described functions includes a POWER button 321, a Manaul button 322 ), joystick switch 323, IoT indicator light 324, Data indicator light 325, and terminals 326, such as FAN terminal 326(a), Control terminal 326(b), It may be composed of a Debug terminal (326(c)), an LTE terminal (326(d)), a Sensor terminal (326(e)), and a GPS antenna terminal (326(f)).

The POWER button 321 is an integrated power switch and a light emitting diode (LED) that displays the power-on state, and the Manaul button 322 is a manual button when the manager manually operates the winch 300 at the observation site. This is the button to switch to the mode.

The joystick switch 323 is used to lower or raise the water quality sensor 100 in manual operation mode, and the IoT indicator light 324 flashes when a transmission request is being made to the Internet of Things wireless network. When connected to the network, it appears lit.

The data indicator light 325 is used to check whether data is transmitted through the Internet of Things wireless network, and lights up when transmission is in progress.

Meanwhile, the FAN terminal 326(a) is a connection terminal connected when a fan heater is placed outside the winch 300 to maintain the inside of the winch 300 in a constant temperature and humidity state, and the control terminal 326(b) is used at the field. This is an interface for receiving observation control commands or transmitting observation data by connecting to the administrator by wire.

The Debug terminal 326(c) is an interface for manufacturing convenience to precisely determine the status of the control board, and the LTE terminal 326(d) is for connecting a wireless antenna for accessing the Internet of Things wireless network. It is a terminal. In addition, the sensor terminal 326(e) is used to check the open/closed state of the door of the enclosure (not shown) to protect the winch 300 when installing the winch 300 outdoors, and the GPS antenna terminal 326(f) )) is a terminal to which a GPS antenna is connected so that accurate location information of the winch 300 can be determined using GPS.

Referring to FIGS. 1 to 5 again, the cable drum 330 is connected to one end of the cable 200, and the cable 200 is normally wound, and when measuring water quality, the water quality sensor 100 is connected to one end of the cable 200. It operates to coil or unwind the cable 200 to reach the location. Here, reference numeral 331 denotes a drum embankment having an ‘H’ cross-sectional shape to prevent the cable 200 from escaping from the cable drum 330.

Meanwhile, reference numeral 380 denotes a limit sensor 380, which is a sensor that detects the position of the sensor trigger 210 connected to the cable 200.

Figure 7 is a diagram for explaining the operation of the roller in the water quality measuring device according to a preferred embodiment of the present invention, and Figure 8 is a diagram showing a drive motor for driving the roller and cable drum in the water quality measuring device according to a preferred embodiment of the present invention. 9 is an algorithm for explaining how cable tension is controlled by rollers and cable drums in the water quality measurement device according to the preferred embodiment of the present invention.

7 to 9 will be described together with regard to tension control of the cable.

When measuring water quality by depth using the water quality measuring device of the present invention, the cable 200 must be lowered to a depth of several tens of meters or more through the pipe hole, and since the cable 200 is in contact with water, the cable 200 ) is not only subject to a significant load, but is also prone to slipping.

Therefore, in the present invention, a tension control function is provided to adjust the tension of the cable 200 to a certain range to cope with the above-described problem, and this function is implemented by the cable drum 330 and roller 340 described above. It can be.

The roller 340 is located in front of the cable drum 330 and supports a certain portion of the cable 200 while sensing the tension of the cable 200. The first roller 341 and the second roller 342 It may be composed of a total of three rollers, including a third roller 343.

Specifically, the first roller 341 is located a predetermined distance away from the cable drum 330 and has a smaller outer diameter than the cable drum 330.

The second roller 342 may consist of two pieces and are positioned to face each other at the top of the outer edge of the first roller 341. Here, the first roller 341 and the second roller 342 are separated by a predetermined distance so that the cable 200 can pass between the first roller 341 and the second roller 342 in a state of close contact, that is, an engaged state. It is in a separated state.

The third roller 343 is a roller equipped with a sensor (not shown) for measuring tension while maintaining tension on the cable 200. A depression is formed in the center of the circumferential surface to prevent the cable 200 from coming off, It is located slightly away from the first roller 341 by a predetermined distance.

When explaining the arrangement of the cable 200 with reference to FIG. 7, one side is connected to the water quality sensor and the other side is connected to the cable drum 330, and a predetermined portion is seated on the upper part of the first roller 341, facing each other. The beam is in close contact with a pair of second rollers 342.

And the cable 200 facing the cable drum 330 is arranged to face the cable drum 330 after passing through the third roller 343. Here, the cable 200 is arranged to move in an approximately 'S'-shaped direction by the cable drum 330 and the third roller 343, and includes a guide plate 360 to guide the moving path of the cable 200, and It is preferable that a path change unit 370 for changing the path of the cable 200 is further provided near the cable drum 330 and the roller 340.

Meanwhile, the first roller 341 and the cable drum 330 are a pair of drive motors 390. In detail, the first roller 341 is a first drive motor 391, and the cable drum 330 is a pair of drive motors 390. It can rotate in one or both directions by the drive motor 392, and the first roller 341 and the cable drum 330 may be integrated with sensors such as an encoder and a tachometer that can measure the rotation speed. . Of course, a sensor (not shown) capable of measuring the rotational speed of the first roller 341 and the cable drum 330 may be separately installed near the first roller 341 and the cable drum 330.

A method of adjusting the tension when winding the cable through the cable drum 330 and roller 340 as described above will be described with reference to FIG. 9.

First, the operator inputs the winding speed of the first roller 341 and the tension value of the third roller 343. Then, the first drive motor 391 rotates in conjunction so that the first roller 341 can wind the cable 200 at a set speed, and the cable drum 330 rotates the second drive motor to correspond to the set tension value. (392) rotates in conjunction with each other.

Of course, it is obvious that the above-described operating principle can be used even when the cable is unwound.

Here, the first drive motor 391 and the second drive motor 392 are preferably micro-stepping motors to enable precise driving and control, but are not limited thereto.

Figure 10 is an exploded perspective view of the blower in the water quality measuring device according to a preferred embodiment of the present invention, and Figure 11 is a front view of the body part constituting the blower in the water quality measuring device according to the preferred embodiment of the present invention.

When explaining the blower unit 350 with reference to FIGS. 10 and 11, moisture attaches to the cable 200 inserted into the observation hole to measure water quality, and the blower unit 350 is configured to remove such moisture.

The exhaust unit 350 includes a pair of first body parts 351 and second body parts 353 that are positioned facing each other with the cable 200 interposed, and these first body parts 351 and second body parts It consists of a first fan 352 and a second fan 354 respectively mounted on the body portion 353.

First, the first body portion 351 is provided with a first storage groove 351(a) recessed to a predetermined depth and a first slit 351(b) located below the first storage groove 351(a). and the first fan 352 is located in the first storage groove 351(a). Also, in the case of the second body portion 353, a second storage groove 353(a) recessed to a predetermined depth and a second slit 353(b) located above the second storage groove 353(a). is provided, and the second fan 354 is stored in the second storage groove 353(a).

In this way, the first fan 352 and the second fan 354 are positioned diagonally from each other at a predetermined distance, which means that the winds generated by the first fan 352 and the second exhaust fan 354 are directed to each other. This is to avoid collision.

Meanwhile, a pair of inclined surfaces facing each other are located in the first storage groove 351(a) and the second storage groove 353(a) at a predetermined distance apart, so that the first fan 352 and the second fan 352 Wind from the fan 354 can be supplied intensively toward the cable 200, thereby improving drying efficiency.

In addition, the first slit 351(b) and the second slit 353(b) are provided with a plurality of bars, which prevents the cable 200 from protruding through the slit even when the wind generated from the fan is strong. It is to prevent.

Figure 12 is a block diagram configuring a control unit of a water quality measuring device according to a preferred embodiment of the present invention.

As shown in Figure 12, the control unit includes a data processing unit that transmits observation data, an OP unit that reads manual/automatic selection control commands and displays status indication with LED, and a winch that controls motor drive and tension for cable lifting and lowering movements. A control unit, a power management unit that converts the DC power required by the system from the DC power supplied from the solar power generation set required to drive the winch, a data logger unit that stores and manages observation data in memory, a GPS location detection unit, and an observation data unit. It may be composed of a wireless modem unit that transmits and receives control commands.

Figure 13 is a flowchart for explaining a method of measuring water quality using a water quality measuring device according to a preferred embodiment of the present invention.

As shown in Figure 13, the water quality measurement method according to the present invention includes (S1) lowering the cable 200 connected to the water quality sensor 100 into an observation hole; (S2) measuring water quality by the water quality sensor 100 and storing the measured water quality results in the control unit 320; and (S3) raising the cable 200 connected to the water quality sensor 100 from the observation hole.

First, to describe the step (S1) in detail, it is a step of lowering the cable 200 into the observation hole where water quality measurement is required. At this time, after determining the depth in advance, the cable 200 is lowered until the corresponding depth is reached, or the cable 200 is lowered to a depth corresponding to a predetermined condition, for example, the salt-salt water boundary.

Here, the depth location corresponding to the fresh-salt water boundary can be determined from whether it falls within the preset standard value range while continuously measuring electrical conductivity, etc., but is not limited to this, and if it falls below the standard value range, it must continue to be lowered. Self-explanatory.

The (S2) step is the step of recording and storing various information such as measurement time, water quality measurement value, and cable length in the data logger. At this time, it is desirable that the elevation and descent are stopped for a certain period of time at the corresponding depth to enable accurate water quality measurement at each depth.

Meanwhile, after water quality measurement at a specific depth is completed, (S1) may be performed again to measure water quality at a different depth.

Step (S3) includes the steps of recovering the cable 200 after the water quality measurement is completed, measuring the water quality by depth while elevating it, or tracking the fresh-salt water boundary.

For example, when the depth in step (S2) corresponds to the lowest depth, the water quality can be measured at each predetermined depth while raising the cable 200.

In addition, when the measured value in step (S2) corresponds to the salt water area, the position corresponding to the salt water boundary can be searched by lifting the cable 200 to find the salt water boundary.

Meanwhile, steps (S1) to (S3) described above may be performed repeatedly multiple times.

As above, specific parts of the present invention have been described in detail, and those skilled in the art will understand that these specific descriptions are merely preferred embodiments and do not limit the scope of the present invention, and do not limit the scope of the present invention. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea, and it is natural that such changes and modifications fall within the scope of the appended patent claims.

100: Water quality sensor
200: cable
210: sensor trigger
300: winch
310: Case 311: Handle
320: control unit
321: POWER button 322: Manaul button
323: Joystick switch 324: IoT indicator light
325: Data indicator light
326: terminal
326(a): FAN terminal 326(b): Control terminal
326(c): Debug terminal 326(d): LTE terminal
326(e): Sensor terminal 326(f): GPS antenna terminal
330: cable drum
331: drum embankment
340: roller
341: first roller 342: second roller
343: third roller
350: exhaust vent
351: first body portion
351(a): first storage groove 351(b): first slit
352: 1st fan
353: second body portion
353(a): second storage groove 353(b): second slit
354: 2nd fan
360: guide plate
370: Path change unit
380: limit sensor
390: Drive motor
391: first driving motor 390: second driving motor

Claims (13)

A water quality measuring device for measuring water quality by depth,
Water quality sensor (100) for measuring water quality;
A cable 200 connected to one end of the water quality sensor 100 and having a predetermined length for transmitting data measured by the water quality sensor 100; and
Including a winch 300 that accommodates the cable 200,
The winch 300 includes a case 310 having a predetermined shape, a control unit 320 that controls the operation of the cable 200, and a device that operates to wind or unwind the cable 200 and can measure rotational speed. A cable drum 330 equipped with a function, a first roller 341 located at a predetermined distance from the cable drum 330 and having an outer diameter smaller than the cable drum 330 and equipped with a function to measure rotational speed. , two second rollers 342 located near the outer edge of the first roller 341 to face each other and having a smaller outer diameter than the first roller 341, and located below the first roller 341 A roller 340 including a third roller 343 spaced apart from the first roller 341 by a predetermined distance and equipped with a tension measurement sensor, a guide plate 360 for guiding the movement path of the cable 200, and the above It includes a path change unit 370 located between the third roller 343 and the cable drum 330 to change the path of the cable 200,
The guide plate 360 is located behind the third roller 343,
The cable 200 is connected between the first roller 341 and the second roller 342, between the first roller 341 and the guide plate 360, a third roller 343, and a path change unit 370. , and cable drum 330 are installed to move in that order,
A first drive motor 391 is connected to the first roller 341, and a second drive motor 392 is connected to the cable drum 330,
A depth-specific water quality measuring device with a tension control function, controlled to adjust the rotational speed of the cable drum 330 to maintain the set winding speed of the first roller 341 and the set tension value of the third roller 343. .
delete delete delete delete delete delete According to paragraph 1,
A water quality measurement device by depth with a tension control function, characterized in that the winch 300 is further provided with an exhaust unit 350 to remove moisture attached to the cable 200.
According to clause 8,
The air exhaust unit 350 includes a pair of first body parts 351 and second body parts 353 that are positioned facing each other with a cable 200 interposed,
The first body portion 351 includes a first storage groove 351(a) recessed to a predetermined depth and a first slit 351(b) located below the first storage groove 351(a). A first exhaust fan 352 is stored in the first storage groove 351(a),
The second body portion 353 includes a second storage groove 353(a) recessed to a predetermined depth and a second slit 353(b) located above the second storage groove 353(a). A water quality measuring device by depth with a tension control function, characterized in that a second exhaust fan 354 is stored in the second storage groove 353(a).
According to paragraph 1,
A water quality measurement device by depth with a tension control function, characterized in that a limit sensor 380 for controlling the position of the cable 200 is further provided inside the winch 300.
According to paragraph 1,
A water quality measurement device by depth with a tension control function, characterized in that a sensor trigger (210) is mounted near one end of the cable (200) connected to the water quality sensor (100).
In the method of measuring water quality by depth using a water quality measurement device by depth with a tension control function described in any one of claims 1, 8 to 11,
(S1) lowering the cable 200 connected to the water quality sensor 100 into the observation hole;
(S2) measuring water quality by the water quality sensor 100 and storing the measured water quality results in the control unit 320; and
(S3) raising the cable 200 connected to the water quality sensor 100 from the observation hole;
In the step (S1), a method of measuring water quality by depth, characterized in that it stops at a fixed location for a predetermined period of time and then descends again.
According to clause 12,
A method for measuring water quality by depth, wherein steps (S1) to (S3) are repeated multiple times at predetermined intervals.

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