Multi-parameter water quality measurement probe and control method thereof

Abstract

A multi-parameter water quality measurement probe includes a plurality of water quality measurement sensors for measuring water quality and a control unit for controlling the operation of the water quality measurement sensors, and the control unit can control the measurements of the water quality measurement sensors to be performed sequentially with temporal separation from each other to prevent electrical or optical interference between the water quality measurement sensors.

Description

Technology Field

[0001] The present invention relates to a multi-parameter water quality measurement probe for water quality measurement and a control method thereof, comprising a plurality of water quality measurement sensors and a control method thereof for preventing electrical or optical interference between each sensor. Background Technology

[0002] Water quality monitoring is recognized as an essential technology in various fields, including environmental protection, water supply management, and industrial process control. In particular, there is a continuously increasing need for multi-parameter water quality probes capable of simultaneously measuring various water quality parameters such as pH, electrical conductivity, dissolved oxygen, and turbidity. These multi-parameter probes offer significant advantages in terms of cost-effectiveness and convenience, as they enable the efficient monitoring of multiple water quality indicators.

[0003] However, the above-mentioned multi-parameter water quality measurement probe may experience electrical or optical interference when multiple water quality measurement sensors operate simultaneously. In particular, the driving current of the pH sensor may cause noise in the measurement of the electrical conductivity sensor, or the light sources of the dissolved oxygen sensor and the turbidity sensor may cause optical crosstalk with each other, thereby degrading measurement accuracy.

[0004] Therefore, a multi-parameter water quality measurement probe capable of fundamentally preventing electrical and optical interference between the aforementioned water quality measurement sensors is required. The problem to be solved

[0005] The present invention provides a multi-parameter water quality measurement probe and a control method thereof that can increase measurement accuracy by preventing electrical or optical interference between a plurality of water quality measurement sensors. means of solving the problem

[0006] A multi-parameter water quality measuring probe according to the present invention comprises a plurality of water quality measuring sensors for measuring water quality and a control unit for controlling the operation of the water quality measuring sensors, and the control unit can control the measurements of the water quality measuring sensors to be performed sequentially with temporal separation from each other to prevent electrical or optical interference between the water quality measuring sensors.

[0007] According to one embodiment of the present invention, the water quality measuring sensor includes a pH sensor, an electrical conductivity sensor, a dissolved oxygen sensor, and a turbidity sensor, and the control unit can control the measurement to be performed in the order of the pH sensor, the electrical conductivity sensor, the dissolved oxygen sensor, and the turbidity sensor.

[0008] According to one embodiment of the present invention, the multi-parameter water quality measuring probe further includes a cleaning motor for cleaning the water quality measuring sensor, and the control unit can control the cleaning motor to perform cleaning of the water quality measuring sensor.

[0009] According to one embodiment of the present invention, the control unit may stop all measurements by the water quality measurement sensor when the cleaning motor is driven.

[0010] According to one embodiment of the present invention, the control unit may provide a stabilization time to remove bubbles or fine particles remaining on the outer surface of the water quality measuring sensor after stopping the operation of the cleaning motor.

[0011] According to one embodiment of the present invention, the control unit may provide a waiting time for the measurement stabilization of the water quality measurement sensor after the measurement of the water quality measurement sensor.

[0012] A control method for a multi-parameter water quality measurement probe equipped with a plurality of water quality measurement sensors according to the present invention may include a water quality measurement step of sequentially performing measurements of the water quality measurement sensors by separating them in time from each other to prevent electrical or optical interference between the water quality measurement sensors.

[0013] According to one embodiment of the present invention, the water quality measuring sensor includes a pH sensor, an electrical conductivity sensor, a dissolved oxygen sensor, and a turbidity sensor, and the step of performing measurements of the water quality measuring sensors sequentially separated by time may include a pH measuring step of applying a driving current to the pH sensor to measure water quality and cutting off the driving current after the measurement is completed, an electrical conductivity measuring step of applying a driving current to the electrical conductivity sensor to measure water quality and cutting off the driving current after the measurement is completed, a dissolved oxygen measuring step of driving a light source of the dissolved oxygen sensor to measure water quality and turning off the light source after the measurement is completed, and a turbidity measuring step of driving a light source of the turbidity sensor to measure water quality and turning off the light source after the measurement is completed.

[0014] According to one embodiment of the present invention, the multi-parameter water quality measuring probe further includes a cleaning motor, and the control method of the multi-parameter water quality measuring probe equipped with a plurality of water quality measuring sensors may further include a cleaning step of driving the cleaning motor to clean the outer surface of the water quality measuring sensor and stopping the driving of the cleaning motor after cleaning.

[0015] According to one embodiment of the present invention, when the cleaning motor is driven, the power supply or driving current of all water quality measurement sensors may be cut off.

[0016] According to one embodiment of the present invention, a control method for a multi-parameter water quality measurement probe equipped with a plurality of water quality measurement sensors may further include a stabilization step of providing a stabilization time to remove bubbles or fine particles remaining on the outer surface of the water quality measurement sensor after stopping the operation of the cleaning motor.

[0017] According to one embodiment of the present invention, after applying a driving current or light source signal to the water quality measuring sensor, a waiting time may be provided so that the output of the water quality measuring sensor stabilizes. Effects of the invention

[0018] According to the present invention, measurement accuracy can be significantly improved by preventing electrical or optical interference between water quality measurement sensors through temporal separation.

[0019] In addition, by providing an optimized measurement sequence considering the unique electrical and optical characteristics of the pH sensor, the electrical conductivity sensor, the dissolved oxygen sensor, and the turbidity sensor, measurement reliability and power efficiency can be improved.

[0020] In addition, by stopping the measurement of the water quality measurement sensor and providing a stabilization time when the cleaning motor is driven, the decrease in the measurement accuracy of the water quality measurement sensor caused by the driving of the cleaning motor can be prevented. Brief explanation of the drawing

[0021] FIG. 1 is a block diagram illustrating the configuration of a multi-parameter water quality measurement probe according to the present invention. FIG. 2 is a flowchart illustrating a control method for a multi-parameter water quality measurement probe according to the present invention. Figure 3 is a flowchart illustrating the water quality measurement method illustrated in Figure 2. Specific details for implementing the invention

[0022] The present invention will be described in detail below with reference to the attached drawings. Since the present invention is susceptible to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Similar reference numerals have been used for similar components in the description of each drawing. In the attached drawings, the dimensions of the structures are shown enlarged compared to the actual dimensions for clarity of the present invention.

[0023] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0024] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0025] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0027] FIG. 1 is a block diagram illustrating the configuration of a multi-parameter water quality measurement probe according to the present invention.

[0028] Referring to FIG. 1, the multi-parameter water quality measurement probe (100) of the present invention may include a plurality of water quality measurement sensors (110) and a control unit (120) for controlling the operation of the water quality measurement sensors (110).

[0029] The above water quality measuring sensor (110) may be composed of a plurality of sensors capable of measuring various water quality parameters. In one embodiment of the present invention, the water quality measuring sensor (110) may include a pH sensor (111), an electrical conductivity sensor (112), a dissolved oxygen sensor (113), and a turbidity sensor (114), but is not limited thereto.

[0030] Although not shown, the water quality measurement sensor (110) may additionally include various sensors as needed, such as a water temperature sensor, a salinity sensor, a nitrogen compound sensor, a phosphorus compound sensor, and a heavy metal sensor.

[0031] The above pH sensor (111) is a sensor capable of determining the acidity or alkalinity of water quality by measuring the hydrogen ion concentration, and can generally be composed of a glass electrode and a reference electrode.

[0032] The above electrical conductivity sensor (112) is a sensor capable of indirectly determining the total amount of dissolved ions by measuring the electrical conductivity of water. The above electrical conductivity sensor (112) can generally be composed of two or four electrodes, and can calculate electrical conductivity by applying an alternating voltage and measuring the flow of current.

[0033] The above dissolved oxygen sensor (113) is a sensor capable of measuring the concentration of oxygen dissolved in water and can be implemented in an optical or electrochemical manner.

[0034] In the present invention, the dissolved oxygen sensor (113) may be an optical sensor and may include a light source and a photodetector. The dissolved oxygen sensor (113) may measure the amount of dissolved oxygen by emitting light of a specific wavelength from the light source and detecting a change in fluorescence characteristics according to oxygen concentration at the photodetector.

[0035] The above turbidity sensor (114) is a sensor capable of measuring the degree of turbidity of water and may generally include a light source and a photodetector. The above turbidity sensor (114) can indirectly determine the concentration of suspended matter by irradiating light from the light source and measuring the degree of scattering or transmission of the light irradiated into the water at the photodetector.

[0036] The control unit (120) controls the operation of the water quality measurement sensor (110). The control unit (120) may include, in hardware terms, a microprocessor, memory, an input / output interface, a power management circuit, etc., and in software terms, a sensor control algorithm, a data processing module, a communication protocol, etc.

[0037] Since the water quality measurement sensors (110) each use different detection principles, interference may occur between the water quality measurement sensors (110). For example, in the case of electric sensors such as the pH sensor (111) and the electrical conductivity sensor (112), a driving current is applied to the electrode or a change in the electric field occurs during the measurement process, and the electrical change may cause noise in the optical signal receiving circuit of the optical sensor, thereby reducing the measurement precision of the dissolved oxygen sensor (113) or the turbidity sensor (114).

[0038] On the other hand, optical sensors such as the dissolved oxygen sensor (113) and the turbidity sensor (114) use a light source or a fluorescent sensing element, so they have little effect on the pH sensor (111) and the electrical conductivity sensor (112), but require a minute electronic and optical waiting time during the lighting process of the light source.

[0039] In addition, since both the pH sensor (111) and the electrical conductivity sensor (112) are electric sensors, electrical interference may occur when they are operated simultaneously. Therefore, the pH sensor (111) and the electrical conductivity sensor (112) can prevent electrical interference by separating the measurement times temporally.

[0040] Likewise, since both the dissolved oxygen sensor (113) and the turbidity sensor (114) are optical sensors, optical interference may occur when the dissolved oxygen sensor (113) and the turbidity sensor (114) are operated simultaneously. Therefore, optical interference can be prevented by separating the measurement times of the dissolved oxygen sensor (113) and the turbidity sensor (114) temporally.

[0041] Accordingly, the control unit (120) controls the water quality measurement sensors (110) so that measurements are performed sequentially with time separation from each other. Thus, electrical or optical interference between the water quality measurement sensors (110) can be prevented and the measurement accuracy of the water quality measurement sensors (110) can be improved.

[0042] First, the pH sensor (111) is measured first because the electrode's potential stabilization time is relatively long and it is sensitive to external electrical stimulation.

[0043] Since the electrical conductivity sensor (112) may affect the ion distribution of water during the conductivity measurement process using alternating current, it is preferable for the electrical conductivity sensor (112) to perform the measurement after the pH sensor (111) has measured. After the measurement of the electrical sensors is completed, all electrical operation of the electrical sensors is cut off so that the photoelectric signal of the optical sensor is not affected by electrical noise.

[0044] Next, the above dissolved oxygen sensor (113) is measured first among the above optical sensors because temperature changes due to the illumination of the light source or stabilization of the optical part are required.

[0045] Finally, the above turbidity sensor (114) operates based on scattered light signals and has relatively low sensitivity to disturbances, so accurate measurement is possible even if it is placed in the latter part of the measurement sequence.

[0046] Therefore, the control unit (120) can control the measurement to be performed in the order of the pH sensor (111), the electrical conductivity sensor (112), the dissolved oxygen sensor (113), and the turbidity sensor (114).

[0047] According to one embodiment of the present invention, the control unit (120) may first activate the electrode by applying a driving current to the pH sensor (111). The driving current may be, for example, about 30 mA, but may be adjusted in the range of 10 mA to 50 mA depending on the ion strength or temperature of the water quality. After applying the driving current, the control unit (120) may wait until the output of the pH sensor (111) stabilizes. The waiting time may be, for example, about 1 second, but may be variably set in the range of 0.5 seconds to 3 seconds. When the measurement of the pH sensor (111) is completed, the control unit (120) may immediately cut off the driving current to prevent electrical interference with other sensors.

[0048] Next, the control unit (120) can apply an alternating current driving signal to the electrical conductivity sensor (112). The alternating current signal may have a frequency of, for example, 1 kHz to 10 kHz, and the driving current may be about 2 mA, but can be adjusted in the range of 1 mA to 5 mA. Since the electrical conductivity sensor (112) has a relatively fast response characteristic, the waiting time may be, for example, about 0.5 seconds, but can be set in the range of 0.1 seconds to 1 second. When the measurement of the electrical conductivity sensor (112) is completed, the control unit (120) can immediately cut off the alternating current driving signal to minimize the impact on subsequent sensors.

[0049] Afterward, the control unit (120) can drive the light source of the dissolved oxygen sensor (113) to perform fluorescence measurement. The driving current of the light source may be, for example, about 50 mA, but can be adjusted in the range of 20 mA to 100 mA depending on the optical conditions of the measurement environment. Since the dissolved oxygen sensor (113) is an optical sensor, the standby time may be relatively long due to its characteristics, for example, about 3 seconds, but can be set in the range of 1 second to 5 seconds. After the measurement of the dissolved oxygen sensor (113) is completed, the control unit (120) can immediately turn off the light source to prevent optical interference with the turbidity sensor (114).

[0050] Next, the control unit (120) can drive the light source of the turbidity sensor (114) to measure scattered light or transmitted light. The driving current of the light source may be, for example, about 100 mA, but can be adjusted in the range of 50 mA to 200 mA depending on the turbidity level of the water quality to be measured. The standby time of the turbidity sensor (114) may be, for example, about 1 second, but can be set in the range of 0.5 seconds to 3 seconds. After the measurement of the turbidity sensor (114) is completed, the control unit (120) can immediately turn off the light source to complete the entire measurement cycle.

[0051] Since the control unit (120) controls the measurements of the water quality measurement sensor (110) sequentially with temporal separation, both electrical interference caused by the operation of the electric sensor and optical interference caused by the operation of the optical sensor can be eliminated. Therefore, the measurement stability and reliability of the water quality measurement sensor (110) can be improved.

[0052] Additionally, the control unit (120) may provide a waiting time for measurement stabilization after the measurement of the pH sensor (111), the electrical conductivity sensor (112), the dissolved oxygen sensor (113), and the turbidity sensor (114). The waiting time ensures that the electrical or optical characteristics of the water quality measurement sensor (110) do not affect the next measurement.

[0053] For example, in the case of the pH sensor (111), time may be required until the polarization phenomenon of the electrode is completely resolved, and in the case of optical sensors such as the dissolved oxygen sensor (113) and the turbidity sensor (114), time may be required until the dark current of the photodetector stabilizes.

[0054] The standby time of each of the above pH sensor (111), the above electrical conductivity sensor (112), the above dissolved oxygen sensor (113), and the above turbidity sensor (114) can be adjusted according to water quality conditions, sensor status, measurement accuracy requirements, etc.

[0055] According to another embodiment of the present invention, the control unit (120) can adjust the measurement order of the water quality measurement sensor (110) according to the water quality condition or measurement environment. For example, in a high turbidity environment, the turbidity sensor (114) can be measured first to optimize the measurement conditions of other sensors.

[0056] According to another embodiment of the present invention, the control unit (120) can monitor and analyze the interference pattern between the water quality measurement sensors (110) in real time. When interference between the water quality measurement sensors (110) is detected, the control unit (120) can minimize the interference by automatically extending the separation time between the water quality measurement sensors (110), changing the measurement order, or adjusting the driving parameters. For example, in water quality with very high electrical conductivity, electrical interference can be prevented by extending the separation time between the electrical conductivity sensor (112) and the pH sensor (111).

[0057] The above multi-parameter water quality measurement probe (100) may further include a cleaning motor (130) for cleaning the water quality measurement sensor (110).

[0058] The cleaning motor (130) is intended to physically remove contaminants, biofilms, sediments, etc. attached to the surface of the water quality measuring sensor (110). For example, the cleaning motor (130) may be a stepping motor, a servo motor, or a DC motor, and may clean the surface of the water quality measuring sensor (110) by rotation or vibration.

[0059] The driving method of the cleaning motor (130) can be implemented in various ways. In one embodiment of the present invention, the cleaning motor (130) can physically clean the surface of the water quality measuring sensor (110) by rotating a brush or wiper installed around the water quality measuring sensor (110). In another embodiment, the cleaning motor (130) can rotate the entire water quality measuring sensor (110) to obtain a self-cleaning effect using the flow of water. In yet another embodiment, the cleaning motor (130) can perform cleaning using sound waves by driving an ultrasonic vibrator.

[0060] The control unit (120) can stop all measurements by the water quality measurement sensor (110) when the cleaning motor (130) is driven. Therefore, mechanical vibrations, electrical noise, changes in water flow, etc., that may occur during the cleaning process using the cleaning motor (130) can be prevented from affecting the measurements by the water quality measurement sensor (110). The control unit (120) can cut off the power or driving current of the water quality measurement sensor (110) before driving the cleaning motor (130), and resume measurements by the water quality measurement sensor (110) after the driving of the cleaning motor (130) is completed.

[0061] Additionally, the control unit (120) may provide a stabilization time to remove bubbles or fine particles remaining on the outer surface of the water quality measurement sensor (110) after stopping the operation of the cleaning motor (130). Through this stabilization time, physical disturbances caused during the cleaning process resulting from the operation of the cleaning motor (130) can be completely eliminated. Therefore, the water quality measurement sensor (110) can perform measurements in a normal measurement environment.

[0062] The stabilization time after the above cleaning can be determined by various factors. These factors may include the viscosity, temperature, flow rate of the water, or the shape or installation location of the water quality measuring sensor (110). For example, the stabilization time may be, for instance, about 30 seconds, but may be variably set in the range of 10 seconds to 120 seconds depending on the above factors.

[0063] The control unit (120) can monitor the signal stability from the water quality measurement sensor (110) in real time to determine whether stabilization is complete, and if it is determined that the signal is sufficiently stabilized, the stabilization time may be shortened.

[0065] FIG. 2 is a flowchart for explaining a control method for a multi-parameter water quality measurement probe according to the present invention, and FIG. 3 is a flowchart for explaining a water quality measurement method illustrated in FIG. 2.

[0066] Referring to FIG. 2, the multi-parameter water quality measurement probe is equipped with a plurality of water quality measurement sensors. The control method of the multi-parameter water quality measurement probe includes a water quality measurement step (S110) in which the measurements of the water quality measurement sensors are performed sequentially with time separation from each other to prevent electrical or optical interference between the water quality measurement sensors.

[0067] In the above water quality measurement step (S110), measurement of the next sensor can be started after the measurement of the first sensor is completed and the driving current or light source is completely cut off. The above temporal separation control method can be implemented by precisely controlling the start and end of the operation of the water quality measurement sensor. At this time, the switching time between sensors may be a sufficient time for the residual signal of the previous sensor to be completely erased. For example, the switching time may be set in the range of about 0.1 seconds to 1 second.

[0068] Since the measurements of the water quality measurement sensors are performed sequentially with temporal separation from each other, electrical or optical interference between the water quality measurement sensors can be prevented and the measurement accuracy of the water quality measurement sensors can be improved.

[0069] Referring to FIG. 3, the water quality measurement sensor includes a pH sensor, an electrical conductivity sensor, a dissolved oxygen sensor, and a turbidity sensor, and the step (S110) of sequentially performing measurements of the water quality measurement sensor with time separation from each other may include a pH measurement step (S111), an electrical conductivity measurement step (S112), a dissolved oxygen measurement step (S113), and a turbidity measurement step (S114).

[0070] At this time, a waiting time for measurement stabilization may be provided after the measurement of the pH sensor, the electrical conductivity sensor, the dissolved oxygen sensor, and the turbidity sensor. The waiting time ensures that the electrical or optical characteristics of the water quality measurement sensor do not affect the next measurement.

[0071] The above pH measurement step (S111) measures water quality by applying a driving current to the pH sensor, and cuts off the driving current after the measurement is completed.

[0072] Specifically, a driving current can be applied to the pH sensor to activate the electrode. The driving current may be set to a fixed value, but can be adjusted within a certain range depending on the ion strength or temperature of the water quality. After applying the driving current, a waiting period may be observed until the output of the pH sensor stabilizes. The waiting time may also be set to a fixed time, but can be variably adjusted within a certain range. Once the measurement by the pH sensor is completed, the driving current can be immediately cut off to prevent electrical interference with other sensors.

[0073] The above electrical conductivity measurement step (S112) measures water quality by applying a driving current to the electrical conductivity sensor, and cuts off the driving current after the measurement is completed.

[0074] Specifically, an AC driving signal can be applied to the electrical conductivity sensor. The AC signal may have a constant frequency, and the driving current may be set to a constant value but may be adjusted within a certain range. Since the electrical conductivity sensor has a relatively fast response characteristic, the standby time may be set to a constant time but may be variably adjusted within a certain range. When the measurement of the electrical conductivity sensor is completed, the AC driving signal can be immediately cut off to minimize the impact on subsequent sensors.

[0075] The above dissolved oxygen measurement step (S113) measures water quality by driving the light source of the dissolved oxygen sensor, and turns off the light source after the measurement is completed.

[0076] Specifically, fluorescence measurement can be performed by driving the light source of the dissolved oxygen sensor. The driving current of the light source may be set to a constant value, but may be adjusted within a certain range depending on the optical conditions of the measurement environment. Since the dissolved oxygen sensor is an optical sensor, the standby time may be set to a relatively long value due to its characteristics, but may be adjusted within a certain range. After the measurement of the dissolved oxygen sensor is completed, the light source may be immediately turned off to prevent optical interference with the turbidity sensor.

[0077] The above turbidity measurement step (S114) can measure water quality by driving the light source of the turbidity sensor, and turn off the light source after the measurement is completed.

[0078] Specifically, scattered light or transmitted light can be measured by driving the light source of the turbidity sensor. The driving current of the light source may be set to a fixed value, but can be adjusted within a certain range depending on the turbidity level of the water quality to be measured. The standby time of the turbidity sensor may be set to a fixed time, but can be adjusted variably within a certain range. After the measurement by the turbidity sensor is completed, the light source can be immediately turned off to complete the entire measurement cycle.

[0079] According to another embodiment of the present invention, in the step (S110) of sequentially performing measurements of the water quality measurement sensors, the measurement order of the water quality measurement sensors can be adjusted according to the water quality condition or measurement environment.

[0080] Referring again to FIG. 2, the multi-parameter water quality measuring probe further includes a cleaning motor, and the control method of the multi-parameter water quality measuring probe further includes a cleaning step (S120) of driving the cleaning motor to clean the outer surface of the water quality measuring sensor and stopping the driving of the cleaning motor after cleaning.

[0081] In the above cleaning step (S120), contaminants, biofilms, sediments, etc. attached to the surface of the water quality measuring sensor are physically removed. For example, the above cleaning step (S120) may clean the surface of the water quality measuring sensor by rotation or vibration.

[0082] In one embodiment, the cleaning step (S120) may physically clean the surface of the water quality measuring sensor by rotating a brush or wiper installed around the water quality measuring sensor using the cleaning motor. In another embodiment, the cleaning step (S120) may obtain a self-cleaning effect using the flow of water by rotating the entire water quality measuring sensor using the cleaning motor. In yet another embodiment, the cleaning step (S120) may perform cleaning using sound waves by driving an ultrasonic vibrator using the cleaning motor.

[0083] The water quality measurement step (S110) may be suspended while the cleaning step (S120) is being performed. Therefore, mechanical vibrations, electrical noise, changes in water flow, etc., that may occur during the process of performing the cleaning step (S120) can be prevented from affecting the measurement of the water quality measurement step (S110). The water quality measurement step (S110) may be performed after the cleaning step (S120) is completed.

[0084] The control method for the multi-parameter water quality measurement probe described above may further include a stabilization step (S130) for providing a stabilization time to remove bubbles or fine particles remaining on the outer surface of the water quality measurement sensor after stopping the operation of the cleaning motor.

[0085] Through the above stabilization step (S130), physical disturbances generated in the above cleaning step (S120) can be completely eliminated. Therefore, in the above water quality measurement step (S110), the water quality measurement sensor can perform measurements in a normal measurement environment.

[0086] The stabilization time of the above stabilization step (S130) may be determined by factors such as the viscosity, temperature, and flow rate of the water quality, or by the shape or installation location of the water quality measurement sensor. For example, the stabilization time may be, for instance, about 30 seconds, but may be variably set within the range of 10 seconds to 120 seconds depending on the above factors.

[0088] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as set forth in the following claims. Explanation of the symbols

[0089] 100: Multi-parameter water quality measurement probe 110: Water quality measurement sensor 111: pH sensor 112: Electrical conductivity sensor 113: Dissolved oxygen sensor 114: Turbidity sensor 120: Control unit 130: Cleaning motor

Claims

Claim 1 A plurality of water quality measuring sensors including a pH sensor, an electrical conductivity sensor, a dissolved oxygen sensor, and a turbidity sensor for measuring water quality; a control unit for controlling the operation of the water quality measuring sensors; and a cleaning motor that physically cleans the surface of the water quality measuring sensor by rotating a brush or wiper installed around the water quality measuring sensor; wherein the control unit controls the measurement of the water quality measuring sensor to be performed sequentially with temporal separation from each other in the order of the pH sensor, the electrical conductivity sensor, the dissolved oxygen sensor, and the turbidity sensor to prevent electrical or optical interference between the water quality measuring sensors; cuts off the driving current or light source of the corresponding sensor upon completion of measurement of each water quality measuring sensor; controls the measurement of the dissolved oxygen sensor and the turbidity sensor, which are optical sensors, to start after the measurement of the electrical sensors, the pH sensor and the electrical conductivity sensor, is completed; stops all measurement of the water quality measuring sensor and cuts off the power or driving current supplied to the water quality measuring sensor when the cleaning motor is driven; monitors the interference pattern between the water quality measuring sensors in real time, and if interference is detected, controls the separation time between the water quality measuring sensors to automatically extend or adjust driving parameters to minimize interference; and after the measurement of the water quality measuring sensor A multi-parameter water quality measurement probe characterized by providing a waiting time for measurement stabilization of the water quality measurement sensor, monitoring the signal stability from the water quality measurement sensor in real time to determine whether stabilization is complete, and controlling to shorten the waiting time if the signal is determined to be stabilized. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 A multi-parameter water quality measuring probe according to claim 1, wherein the control unit provides a stabilization time to remove bubbles or fine particles remaining on the outer surface of the water quality measuring sensor after stopping the operation of the cleaning motor. Claim 6 delete Claim 7 A method for controlling a multi-parameter water quality measurement probe equipped with a plurality of water quality measurement sensors, comprising: a water quality measurement step of sequentially performing measurements of the water quality measurement sensors, namely a pH sensor, an electrical conductivity sensor, a dissolved oxygen sensor, and a turbidity sensor, separated in time from each other in the order of the pH sensor, the electrical conductivity sensor, the dissolved oxygen sensor, and the turbidity sensor to prevent electrical or optical interference between the water quality measurement sensors; and a cleaning step comprising driving a cleaning motor that physically cleans the surface of the water quality measuring sensor by rotating a brush or wiper installed around the water quality measuring sensor to clean the outer surface of the water quality measuring sensor, and stopping the operation of the cleaning motor after cleaning; wherein the water quality measuring step controls the driving current or light source of the corresponding sensor upon completion of measurement of each water quality measuring sensor, and controls the measurement of the dissolved oxygen sensor and the turbidity sensor, which are optical sensors, to start after the measurement of the electrical sensors, the pH sensor and the electrical conductivity sensor, is completed; during the execution of the cleaning step, the water quality measuring step is suspended and the power or driving current of all water quality measuring sensors is cut off; the interference pattern between the water quality measuring sensors is monitored in real time, and if interference is detected, the separation time between the water quality measuring sensors is automatically extended or driving parameters are adjusted to minimize interference; after the driving current or light source signal of the water quality measuring sensor is applied, a waiting time is provided for the measurement stabilization of the water quality measuring sensor, and the signal stability from the water quality measuring sensor is monitored in real time to determine whether stabilization is complete, and the signal A control method for a multi-parameter water quality measurement probe characterized by controlling to shorten the waiting time when it is determined to be stabilized. Claim 8 delete Claim 9 delete Claim 10 delete Claim 11 A control method for a multi-parameter water quality measurement probe, characterized in that, in claim 7, it further includes a stabilization step of providing a stabilization time to remove bubbles or fine particles remaining on the outer surface of the water quality measurement sensor after stopping the operation of the cleaning motor. Claim 12 delete

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