JP2016169970A - Electrode device and system for measuring in-liquid electric potential - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-liquid electric potential measurement electrode device capable of minimizing gas accumulation in a housing thereof and cleaning dirt off from an outer surface side of a filter that covers an opening of the housing.SOLUTION: An in-liquid electric potential measurement electrode device 1 comprises a measurement electrode 12 for measuring in-liquid electric potential, a housing 11 that covers the measurement electrode 12 and has an opening 111 in communication with outside the housing, a filter 112 that covers the opening 111 of the housing 11 and is configured to pass liquid therethrough, and a pair of energizable cleaning electrodes 13a, 13b located in the close proximity of an outer side of the filter 112. The device is configured such that gas generated by energizing the cleaning electrodes 13a, 13b cleans dirt off from the outer surface side of the filter 112.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a liquid potential measurement electrode device and a liquid potential measurement system.

  Conventionally, an electrode device for measuring a liquid potential and a liquid potential measuring system are known (see, for example, Patent Documents 1 and 2).

  Patent Document 1 discloses a potential difference measurement device (liquid potential measurement system) including a pair of electrode portions and a changeover switch. In addition, the changeover switch of the potentiometric device is configured to switch between a potential difference measurement mode in which a potential in the sea is measured by a pair of electrode portions and a cleaning mode in which a current is passed through the pair of electrode portions to clean the electrodes. ing.

  Patent Document 2 includes an electrode for measuring the potential in the liquid, a case body that covers the electrode and has an opening that communicates with the outside, and a filter that covers the opening of the case body and allows the liquid to pass therethrough. An electrode device for measuring a minute potential in liquid (electrode device for measuring a potential in liquid) is disclosed.

JP 2000-258383 A JP 2010-019815 A

  As in Patent Document 2, in the conventional electrode device for measuring a minute potential in liquid (electrode device for measuring the potential in liquid), the electrode for measuring the potential in the liquid has a case body in order to suppress noise. It is covered with (housing). Here, in the conventional configuration in which the electrode for measuring the potential in the liquid as described in Patent Document 2 is covered by the case body, a pair of electrodes is used when the electrodes are cleaned as in Patent Document 1 described above. When an electric current is passed through the electrode, electrolysis of components in the liquid occurs at the electrode, and gas is generated in the liquid such as water or seawater. Since this gas cannot pass through the filter, if the generated gas accumulates in the casing covering the electrodes, it causes noise during potential measurement. Further, since this gas cannot pass through the filter, it is difficult to clean the dirt attached to the outer surface side of the filter that covers the opening of the housing and is exposed to the outside. Therefore, an electrode device for liquid potential measurement and a liquid potential measurement system capable of cleaning dirt adhering to the outer surface side of the filter covering the opening of the housing while suppressing gas accumulation in the housing are provided. It was desired.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide an outer surface of a filter that covers the opening of the housing while suppressing the accumulation of gas in the housing. It is an object to provide a liquid potential measurement electrode device and a liquid potential measurement system capable of cleaning dirt adhering to the side.

  In order to achieve the above object, a liquid potential measuring electrode device according to the first aspect of the present invention includes a measurement electrode for measuring a potential in a liquid, an opening that covers the measurement electrode and communicates with the outside. A housing having an opening, a filter through which liquid is passed, and at least a pair of cleaning electrodes arranged near the outside of the filter and energized with each other. The dirt adhering to the outer surface side of the filter is cleaned by the gas.

  In the submerged potential measuring electrode device according to the first aspect of the present invention, as described above, at least a pair of cleaning electrodes arranged near the outside of the filter and capable of energizing each other is provided, and the cleaning electrode is energized. Contamination adhered to the outer surface side of the filter is cleaned by the generated gas. Thereby, since the electrode for cleaning is outside the casing, it is possible to suppress the gas generated by energization from accumulating in the casing. As a result, it is possible to suppress the occurrence of noise during potential measurement due to the gas accumulated in the housing. Further, since the gas generated by energization of the cleaning electrode passes through the outer surface side of the filter, it is possible to clean the dirt adhering to the outer surface side of the filter. Thereby, since generation | occurrence | production of the electrical resistance resulting from the dirt of a filter can be suppressed, an electric potential can be measured accurately. In addition, when using an electrode device for measuring liquid potential in salt water such as in the sea, the growth of microorganisms on the filter is suppressed by the bactericidal action of chlorine generated by energizing the electrode for washing (electrolysis of salt water). Can do.

  In the liquid potential measuring electrode device according to the first aspect, preferably, the measuring electrode is formed to extend in the first direction, and the cleaning electrode is in a second direction substantially orthogonal to the first direction. It is formed to extend. If comprised in this way, when a filter is provided in the surface orthogonal to the 1st direction of the 1st direction of the 1st direction of a measuring electrode, a pair for washing | cleaning so that it may extend in the 2nd direction along the surface of a filter Since the electrode can be provided, the distance between the cleaning electrode and the filter can be reduced. Thereby, the dirt adhering to the outer surface side of the filter can be effectively cleaned by the gas generated from the cleaning electrode during cleaning.

  In the liquid potential measuring electrode device according to the first aspect, preferably, the measuring electrode is configured by a silver chloride electrode, and the cleaning electrode is configured by at least one of carbon, platinum, or gold. ing. If comprised in this way, when measuring the electric potential in a liquid, an electric potential can be accurately measured with a silver chloride electrode. Further, by constituting the cleaning electrode with at least one of carbon, platinum or gold, the corrosion of the cleaning electrode in the liquid is suppressed, and the dissolution of the cleaning electrode due to electrolysis during cleaning is suppressed. be able to.

  In the liquid potential measurement electrode device according to the first aspect, preferably, the pair of cleaning electrodes are attached to the outer surface of the casing so as to face each other. If comprised in this way, gas will be generated at the time of washing | cleaning from a pair of washing | cleaning electrode arrange | positioned on the outer surface of a housing | casing, and the dirt adhering to the outer surface side of a filter can be wash | cleaned.

  In the liquid potential measuring electrode device according to the first aspect, preferably, the pair of cleaning electrodes are configured to be supplied with an alternating current. If comprised in this way, when using the electrode apparatus for liquid potential measurement in salt water, such as in the sea, chlorine will generate | occur | produce from an anode and hydrogen will generate | occur | produce from a cathode. In this case, by supplying alternating current to the pair of cleaning electrodes, hydrogen and chlorine are alternately generated from both of the pair of cleaning electrodes, so that the vicinity of both the cleaning electrodes can be sterilized with chlorine in a balanced manner. it can. When oxygen is generated from the anode and hydrogen is generated from the cathode, the gas generation ratio is oxygen: hydrogen = 1: 2. In this case, by supplying alternating current to the pair of cleaning electrodes, the anode and the cathode are alternately switched, so that the amount of gas generated from the pair of cleaning electrodes can be made substantially equal. As a result, the vicinity of both cleaning electrodes can be cleaned in a well-balanced manner. Note that the alternating current that is passed through the cleaning electrode is an alternating current in a low frequency region that causes electrolysis.

  A liquid potential measurement system according to a second aspect of the present invention includes a measurement electrode for measuring a potential in a liquid, a housing that covers the measurement electrode and has an opening communicating with the outside, and an opening of the housing. A pair of liquid potential measuring electrode devices including a filter for covering and passing a liquid; and a control unit connected to the pair of liquid potential measuring electrode devices; At least one further includes at least a pair of cleaning electrodes arranged in the vicinity of the outside of the filter and capable of energizing each other, and the control unit controls the measurement of the potential difference between the measurement electrodes and the control of energizing the cleaning electrodes. The dirt adhered to the outer surface side of the filter is cleaned by the gas generated by energization of the cleaning electrode.

  In the submerged potential measurement system according to the second aspect of the present invention, as described above, at least a pair of cleaning electrodes arranged near the outside of the filter and capable of energizing each other is provided, and generated by energization of the cleaning electrodes. The gas adhered to the outer surface side of the filter is cleaned. Thereby, since the electrode for cleaning is outside the casing, it is possible to suppress the gas generated by energization from accumulating in the casing. As a result, it is possible to suppress the occurrence of noise during potential measurement due to the gas accumulated in the housing. Further, since the gas generated by energization of the cleaning electrode passes through the outer surface side of the filter, it is possible to clean the dirt adhering to the outer surface side of the filter. Thereby, since generation | occurrence | production of the electrical resistance resulting from the dirt adhering to the outer surface side of a filter can be suppressed, an electric potential can be measured accurately. Accordingly, it is possible to provide an in-liquid potential measurement system capable of cleaning dirt adhered to the outer surface side of the filter covering the opening of the housing while suppressing the accumulation of gas in the housing. In addition, when using an electrode device for measuring liquid potential in salt water such as in the sea, the growth of microorganisms on the filter is suppressed by the bactericidal action of chlorine generated by energizing the electrode for washing (electrolysis of salt water). Can do.

  According to the present invention, as described above, the liquid potential measurement is capable of cleaning the dirt attached to the outer surface side of the filter covering the opening of the housing while suppressing the accumulation of gas in the housing. An electrode device and a submerged potential measurement system can be provided.

It is the block diagram which showed the outline of the liquid potential measuring system provided with the electrode apparatus for liquid potential measurement by one Embodiment of this invention. It is side surface sectional drawing which showed the electrode apparatus for liquid potential measurement by one Embodiment of this invention. It is the top view which showed the electrode apparatus for liquid potential measurement by one Embodiment of this invention. It is a side view for demonstrating washing | cleaning of the electrode apparatus for liquid potential measurement by one Embodiment of this invention. It is the top view which showed the electrode apparatus for liquid potential measurement by the 1st modification of one Embodiment of this invention. It is the top view which showed the electrode apparatus for liquid potential measurement by the 2nd modification of one Embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

(Configuration of liquid potential measurement system)
The liquid potential measuring electrode device 1 according to the present embodiment is used in a liquid potential measuring system 100 that measures a minute potential in liquid (in the sea) as shown in FIG. The liquid potential measurement system 100 includes a pair of liquid potential measurement electrode devices 1, a control unit 2, an amplifier 3, and a power source 4.

  The submerged potential measuring system 100 is configured to measure a potential difference between the pair of submerged potential measuring electrode devices 1, amplify it by an amplifier 3, and observe it by the control unit 2. Moreover, the submerged potential measurement system 100 is configured to measure a current in the sea based on the measured potential difference.

(Configuration of electrode device for measuring liquid potential)
A pair of liquid potential measuring electrode devices 1 have the same configuration. As shown in FIG. 2, the liquid potential measuring electrode device 1 includes a housing 11, a measuring electrode 12, and a pair of cleaning electrodes 13a and 13b. The X direction (X1 direction, X2 direction), Y direction (Y1 direction, Y2 direction) and Z direction (Z1 direction, Z2 direction) in the figure are relative to each other in the liquid potential measuring electrode device 1. Shows direction. That is, it does not indicate the installation direction of the in-liquid potential measurement electrode device 1 in water (underwater).

  An opening 111 communicating with the outside is formed in the housing 11. The opening 111 of the housing 11 is provided with a filter 112 that allows seawater (liquid) to pass through. A space 113 is formed in the housing 11. The casing 11 is configured to cover the measurement electrode 12. In other words, the measurement electrode 12 is arranged in the space 113 in the housing 11. The casing 11 is formed in a cylindrical shape extending in the first direction (Z direction). An opening 111 is formed on the bottom surface on one side (Z1 direction side) of the cylindrical housing 11. That is, the opening 111 is arranged on one end side of the space 113 in the housing 11.

  The opening 111 of the housing 11 is configured to allow external water (seawater) to pass through the filter 112. Thus, when the submerged potential measuring electrode device 1 is used, external water (seawater) communicates with the measuring electrode 12, and the potential in the liquid (underwater) can be measured.

  The filter 112 is disposed so as to cover the opening 111 of the housing 11. The filter 112 is configured to pass seawater (liquid). Moreover, the filter 112 contains a nonwoven fabric, for example. Thereby, when the electrode device 1 for measuring a liquid potential is installed in a liquid, it is possible to suppress the entry of a foreign substance into the housing 11, so that the potential can be stably measured.

  The measurement electrode 12 is composed of a silver-silver chloride electrode containing silver (Ag) and silver chloride (AgCl). The measurement electrode 12 is connected to the wiring 121 as shown in FIGS. The wiring 121 is connected to the control unit 2 via the amplifier 3 as shown in FIG. The measurement electrode 12 has a cylindrical shape and is arranged so as to extend in the longitudinal direction of the housing 11. That is, the measurement electrode 12 is formed to extend in the first direction (Z direction), similarly to the housing 11.

  Here, in this embodiment, as shown in FIGS. 2 and 3, the pair of cleaning electrodes 13 a and 13 b are arranged in the vicinity of the outside of the filter 112. Further, the pair of cleaning electrodes 13a and 13b are configured to be able to be energized with each other. Specifically, the pair of cleaning electrodes 13a and 13b are connected to the power supply 4 via wirings 131a and 131b, respectively. The power supply 4 is configured to energize between the cleaning electrodes 13a and 13b. The wires 131a and 131b pass through the outside of the housing 11 and are connected to the cleaning electrodes 13a and 13b, respectively.

  The pair of cleaning electrodes 13a and 13b are formed to extend in a second direction (Y direction) substantially orthogonal to the first direction. That is, the cleaning electrodes 13 a and 13 b are disposed substantially parallel to the filter 112. The cleaning electrode 13a (13b) is formed to have a smaller width (diameter) than the measurement electrode 12.

  The pair of cleaning electrodes 13 a and 13 b are attached to the outer surface of the housing 11 so as to face each other. Specifically, the pair of cleaning electrodes 13a and 13b are arranged in parallel to each other. Further, as shown in FIG. 3, the pair of cleaning electrodes 13 a and 13 b are disposed so as to overlap the filter 112 in a plan view (viewed from the Z direction). The pair of cleaning electrodes 13a and 13b are arranged so as not to overlap the measurement electrode 12 in plan view (viewed from the Z direction). The pair of cleaning electrodes 13a and 13b is made of platinum.

Further, in the present embodiment, the dirt attached to the outer surface side of the filter 112 is cleaned by gas (hydrogen and chlorine) generated by energization of the cleaning electrodes 13a and 13b. That is, seawater (liquid) is electrolyzed by energization between the cleaning electrodes 13a and 13b, chlorine (Cl ₂ ) is generated from the anode, and hydrogen (H ₂ ) is generated from the cathode. Thereby, as shown in FIG. 4, the dirt adhering to the outer surface side of the filter 112 is peeled off by the gas (chlorine and hydrogen) and cleaned. Further, the pair of cleaning electrodes 13a and 13b is configured to be supplied with an alternating current. The alternating current supplied to the pair of cleaning electrodes 13a and 13b is an alternating current with a low frequency such as 0.1 Hz or 1 Hz (for example, a rectangular waveform). In other words, the alternating current to be energized is an alternating current in a low frequency region where electrolysis occurs (for example, about 1000 Hz or less).

  As shown in FIG. 1, the control unit 2 is configured to control each unit of the liquid potential measurement system 100. Specifically, the control unit 2 is configured to control the cleaning of the liquid potential measuring electrode device 1 by causing a current to flow through the cleaning electrodes 13a and 13b based on a user operation. That is, the control unit 2 is configured to perform control for measuring the potential difference between the measurement electrodes 12 of the pair of liquid potential measurement electrode devices 1 and control for energizing the cleaning electrodes 13a and 13b. . Further, the control unit 2 is configured to control the power supply 4 so as to supply an alternating current to the cleaning electrodes 13a and 13b. Moreover, the control part 2 is comprised so that the electrode apparatus 1 for liquid potential measurement may be controlled at the timing which does not measure the potential difference in the sea. Moreover, the control part 2 is comprised so that washing | cleaning of the electrode apparatus 1 for liquid potential measurement may be performed regularly (for example, once a day).

(Effect of this embodiment)
In the present embodiment, the following effects can be obtained.

  In the present embodiment, as described above, the pair of cleaning electrodes 13a and 13b which are arranged near the outside of the filter 112 and can be energized with each other are provided, and the gas (hydrogen) generated by energization of the cleaning electrodes 13a and 13b is provided. And chlorine), the dirt attached to the outer surface side of the filter 112 is cleaned. Accordingly, since the cleaning electrodes 13a and 13b are outside the casing 11, it is possible to suppress the gas generated by energization from accumulating in the casing 11. As a result, it is possible to suppress the occurrence of noise during potential measurement due to the gas accumulated in the housing 11. Further, since the gas generated by energization of the cleaning electrodes 13a and 13b passes through the outer surface side of the filter 112, dirt attached to the outer surface side of the filter 112 can be cleaned. Thereby, since generation | occurrence | production of the electrical resistance resulting from the stain | pollution | contamination of the filter 112 can be suppressed, an electric potential can be measured accurately. In addition, propagation of microorganisms on the filter 112 can be suppressed by the sterilization action of chlorine generated by energization (electrolysis of salt water) of the cleaning electrodes 13a and 13b.

  In the present embodiment, as described above, the measurement electrode 12 is formed so as to extend in the first direction, and the cleaning electrodes 13a and 13b are extended in the second direction substantially orthogonal to the first direction. Form. Accordingly, when the filter 112 is provided on a surface orthogonal to the first direction on one side of the first direction of the measurement electrode 12, the pair of cleaning electrodes extends in the second direction along the surface of the filter 112. Since 13a and 13b can be provided, the distance between the cleaning electrodes 13a and 13b and the filter 112 can be reduced. Thereby, the dirt adhering to the outer surface side of the filter 112 can be effectively cleaned by the gas generated from the cleaning electrodes 13a and 13b during the cleaning.

  In the present embodiment, as described above, the measurement electrode 12 is composed of a silver chloride electrode, and the cleaning electrodes 13a and 13b are composed of platinum. Thereby, the potential can be accurately measured by the silver chloride electrode when measuring the potential in the liquid. Further, by constituting the cleaning electrodes 13a and 13b with platinum, corrosion of the cleaning electrodes 13a and 13b in the liquid is suppressed, and dissolution of the cleaning electrodes 13a and 13b due to electrolysis during cleaning is suppressed. be able to.

  In the present embodiment, as described above, the pair of cleaning electrodes 13 a and 13 b are attached to the outer surface of the housing 11 so as to face each other. Thereby, gas is generated at the time of cleaning from the pair of cleaning electrodes 13 a and 13 b arranged on the outer surface of the housing 11, and the dirt attached to the outer surface side of the filter 112 can be cleaned.

  In the present embodiment, as described above, an alternating current is applied to the pair of cleaning electrodes 13a and 13b. As a result, when the submerged potential measuring electrode device 1 is used in salt water such as in the sea, chlorine is generated from the anode and hydrogen is generated from the cathode. In this case, by supplying alternating current to the pair of cleaning electrodes 13a and 13b, hydrogen and chlorine are alternately generated from both of the pair of cleaning electrodes 13a and 13b. Therefore, in the vicinity of both the cleaning electrodes 13a and 13b Can be sterilized with chlorine in a well-balanced manner.

(Modification)
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said embodiment, although the example which arrange | positions the electrode apparatus for liquid potential measurement in seawater was shown, this invention is not limited to this. In this invention, you may arrange | position the electrode apparatus for liquid potential measurement in liquids other than seawater. For example, the liquid potential measuring electrode device may be disposed in water such as a lake or a pond.

  Moreover, in the said embodiment, although the electrode for a measurement was formed in the column shape, the present invention is not limited to this. In the present invention, the measurement electrode may be formed in a shape other than the cylindrical shape. For example, the measurement electrode may be formed in a prismatic shape.

  In the above embodiment, an example in which a pair of cleaning electrodes is provided in both of the pair of liquid potential measuring electrode devices is shown, but the present invention is not limited to this. In the present invention, it is sufficient that at least one of the pair of liquid potential measuring electrode devices is provided with a cleaning electrode.

  Moreover, in the said embodiment, although the liquid potential measuring system showed the example of a structure provided with two electrode devices for liquid potential measurement, this invention is not limited to this. In the present invention, the liquid potential measuring system may include three or more liquid potential measuring electrode devices.

  In the above embodiment, the example in which the pair of cleaning electrodes are arranged so as to overlap the filter is shown, but the present invention is not limited to this. In the present invention, for example, a pair of cleaning electrodes 202 a and 202 b may be provided on the outer periphery of the filter 112, as in the liquid potential measurement electrode device 201 of the first modification shown in FIG. 5.

  In the above-described embodiment, an example in which a pair of cleaning electrodes is provided in the liquid potential measurement electrode device has been described, but the present invention is not limited thereto. In the present invention, two or more pairs of cleaning electrodes may be provided in the liquid potential measuring electrode device. For example, two pairs of cleaning electrodes 302a and 302b and cleaning electrodes 303a and 303b may be provided as in the liquid potential measuring electrode device 301 of the second modification shown in FIG. In this case, the cleaning electrodes 302a and 302b can be energized with each other, and the cleaning electrodes 303a and 303b can be energized with each other. The cleaning electrodes 302a and 302b are connected to the wirings 304a and 304b, respectively, and the cleaning electrodes 303a and 303b are connected to the wirings 305a and 305b, respectively.

  Moreover, although the example which the wiring connected to the electrode for washing | cleaning has been arrange | positioned through the outer side of the housing | casing was shown in the said embodiment, this invention is not limited to this. In the present invention, the wiring connected to the cleaning electrode may be passed through the space inside the casing, or may be embedded and passed through the casing.

  Moreover, in the said embodiment, although the example of the structure to which an alternating current is supplied with a pair of cleaning electrode was shown, this invention is not limited to this. In the present invention, a direct current may be applied to the pair of cleaning electrodes.

  Moreover, in the said embodiment, although the filter of the electrode apparatus for liquid potential measurement showed the example comprised by the nonwoven fabric, this invention is not limited to this. In this invention, you may comprise the filter of the electrode apparatus for a liquid potential measurement with materials other than a nonwoven fabric.

  Moreover, in the said embodiment, although the example in which the electrode for washing | cleaning was comprised with platinum was shown, this invention is not limited to this. In the present invention, the cleaning electrode may be composed of other than platinum. For example, the cleaning electrode may be made of carbon (graphite) or gold. The cleaning electrode may be made of a material containing at least one of platinum, gold, and carbon.

  Moreover, in the said embodiment, although the electrode for a measurement comprised the silver chloride electrode, the present invention is not limited to this. In the present invention, the measurement electrode may be composed of other than the silver chloride electrode.

1, 201, 301 Electrode device for liquid potential measurement 2 Control unit 11 Housing 12 Measurement electrode 13a, 13b, 202a, 202b, 302a, 302b, 303a, 303b Cleaning electrode 100 Liquid potential measurement system 111 Opening 112 Filter

Claims (6)

A measuring electrode for measuring the potential in the liquid;
A housing that covers the measurement electrode and has an opening communicating with the outside;
A filter that covers the opening of the housing and allows liquid to pass through;
Comprising at least a pair of cleaning electrodes arranged near the outside of the filter and capable of energizing each other;
An in-liquid potential measuring electrode device configured to clean dirt adhered to the outer surface side of the filter by a gas generated by energization of the cleaning electrode. The measurement electrode is formed to extend in the first direction,
The in-liquid potential measuring electrode device according to claim 1, wherein the cleaning electrode is formed to extend in a second direction substantially orthogonal to the first direction. The measurement electrode is composed of a silver chloride electrode,
The liquid electrode potential measuring electrode device according to claim 1, wherein the cleaning electrode is made of at least one of carbon, platinum, and gold.   The liquid electrode potential measuring electrode device according to any one of claims 1 to 3, wherein the pair of cleaning electrodes are attached to the outer surface of the casing so as to face each other.   5. The liquid potential measuring electrode device according to claim 1, wherein an alternating current is applied to the pair of cleaning electrodes. 6. A pair of electrodes including a measurement electrode for measuring a potential in the liquid, a housing that covers the measurement electrode and that has an opening communicating with the outside, and a filter that covers the opening of the housing and allows the liquid to pass therethrough. An electrode device for measuring the potential in liquid,
A control unit connected to the pair of electrode devices for potential measurement in liquid,
At least one of the pair of liquid potential measuring electrode devices further includes at least a pair of cleaning electrodes arranged near the outside of the filter and capable of energizing each other,
The control unit is configured to perform control for measuring a potential difference between the measurement electrodes and control for energizing the cleaning electrode,
An in-liquid potential measurement system configured to clean dirt adhered to the outer surface side of the filter by a gas generated by energization of the cleaning electrode.

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