JP2000009680A - Sensor for water-quality detection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor for water-quality detection, in which the influence of the adhesion of air bubbles is reduced and by which a water quality can be detected stably. SOLUTION: In a sensor A for water-quality detection, a working electrode 3 which is constituted by installing a filler 11 between an electrode body 8 and the side face part of a chip 9 comprising a sensing part 10 is provided, and a reference electrode 4 is provided. The electrode body 8, the chip 9 and the filler 11 are formed to become a smooth face shape. An edge or a step is not formed near the sensing part 10. The adhesion of air bubbles to the sensing part 10 is reduced, the generation of a noise due to the air bubbles is suppressed, and an output can be detected stably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the concentration of various ions such as hydrogen ion, sodium ion, calcium ion and chlorine ion in water and the concentration of dissolved gas such as oxygen and ozone in water.
Alternatively, the present invention relates to a water quality detection sensor for measuring water quality such as oxidation-reduction potential.

[0002]

2. Description of the Related Art Conventionally, water quality detection sensors have been used not only for research purposes, but also for industrial equipment (for example, those described in Japanese Patent Application Laid-Open No. 59-6988) and household equipment (for example, Japanese Utility Model Application Publication No. No. 172391). In recent years, practical use of water quality detection sensors for displaying or controlling water quality with a domestic water treatment device has been promoted, and furthermore, in order to reduce the size of products and to suppress pressure loss in the sensor section, small sensors have been used. Is desired.

[0003] As a sensor which can be miniaturized in this way, for example, an ion sensor to which an electric field effect transistor disclosed in Japanese Patent Publication No. 54-24317 has been proposed. Ion water conditioners (for example, those described in JP-A-6-254560), bath water temperature bathers (for example, those described in JP-A-6-335675), and the like have also been proposed.

[0004]

However, as described above, by miniaturizing the water quality detecting sensor A, the sensitive portion of the working electrode that is sensitive to the substance to be measured contained in the water is necessarily reduced in size. For this reason, noise caused by the air bubbles having little effect on the size of the conventional sensitive portion adhering to the sensitive portion cannot be ignored. In an extreme case, the air bubble covers the sensitive part, and the detection becomes impossible. In particular, when used in a water quality treatment device, water to be detected is passed through the water quality detection sensor unit while entraining air bubbles at the beginning of use, so that troubles due to air bubbles adhering to the sensitive unit increase. In addition, in the alkali ion water purifier, hydrogen gas or oxygen gas is purified by electrolyzing water, so that bubbles adhere to the sensitive part not only during the initial passage of water but also during use, resulting in a decrease in output. Cheap. Thus, there has been a problem that stable detection of water quality cannot be performed due to the air bubbles adhering to the sensitive portion.

The present invention has been made in view of the above points, and has as its object to provide a water quality detection sensor capable of performing stable detection by reducing the influence of air bubble adhesion.

[0006]

According to a first aspect of the present invention, there is provided a water quality detection sensor for preventing water from entering between an electrode body and a side surface of a chip having a sensing portion. In the water quality detection sensor A including the working electrode 3 provided with the filler 11 and the comparison electrode 4, the electrode body 1, the tip 9, and the filler 11 are formed so as to have a smooth surface. It is characterized by comprising.

A sensor for detecting water quality according to a second aspect of the present invention has a structure for accommodating and holding a chip 9 having a sensitive portion 10 on an electrode body 8 of a working electrode 3 in addition to the structure of the first aspect. It is characterized by providing a concave portion 26.

According to a third aspect of the present invention, there is provided a water quality detecting sensor according to the first or second aspect of the present invention.
Is formed into a smooth curved surface.

[0009]

Embodiments of the present invention will be described below.

FIG. 1 shows an example of a sensor A for detecting water quality according to the present invention, and its configuration will be described.

The inside of the sensor body 1 is filled with an internal solution 7 composed of an aqueous solution of potassium chloride, and a comparative electrode tank 17 in which a comparative electrode 4 such as a silver / silver chloride electrode is arranged, and a working electrode in which the working electrode 3 is arranged. And a section 19. A lower packing 5 is provided at a lower portion of the sensor body 1. The lower packing 5 covers a lower portion of the reference electrode tank 17 and separates the reference electrode tank 17 from the water passage 15, and is provided at a position corresponding to the working electrode portion 19. The communication hole 20 is formed so as to connect the working electrode portion 19 and the water passage 15.
An amplifier 2 is disposed above the sensor body 1. The amplifier 2 is configured such that the working electrode 3 and the reference electrode 4 are electrically connected to each other. By amplifying the electromotive force generated by the potential difference between the working electrode 3 and the comparison electrode 4 due to the water quality at a predetermined amplification rate and outputting the amplified electromotive force to the display unit and the control unit of the water treatment equipment,
This is to detect water quality. A liquid junction ceramic 6 which is a porous material is inserted through and held in the lower packing 5 so that the reference electrode tank 17 and the outside are connected by the liquid junction ceramic 6, and the internal liquid 7 elutes from the liquid junction ceramic 6. By doing so, the water supplied to the water passage 15 and the internal liquid 7 are electrically conducted.

The structure of the working electrode 3 will be described with reference to FIGS. A flat housing 21 is formed at a part near the lower end of the side surface of the cylindrical electrode body 8.
1 is provided with a plate-shaped chip 9 having a sensitive part 10 having a size of about 5 mm × 5 mm. As this chip 9,
Forming a wiring pattern on the surface of a ceramic material such as alumina or zirconia with a conductive material such as a metal,
By electrically connecting a chip 9 to be described later and a connection portion between the leads 12 and 13, the sensitive portion 10 and the lead 1 are connected.
A device that electrically connects the second and the third to each other can be used. Here, the sensitive part 10 is made of p
An electrode for measuring H, an insoluble electrode for measuring oxidation-reduction potential of platinum or gold for measuring oxidation-reduction potential, and the like are provided. The two lead wires 12 and 13 are the electrode body 8
It is housed in a hollow portion formed inside, one end of which is pulled out from the upper end of the electrode body 8 and connected to the amplifier 2, and the other end is drawn out of a pair of through holes 23 provided on the side surface of the electrode body 8. Together with the chip 9. The filler 11 fills a recess formed between the accommodating portion 21 of the electrode body 8 and the side surface of the chip 9, and fills the outer peripheral surface of the electrode body 8, the surface of the chip 9, and the filler 11.
Is provided so as to have a continuous smooth surface, covers the connection portion with the lead wires 12 and 13 on the chip 9, and further has the lead wire 1 drawn out from the side surface of the electrode body 8.
It is provided so as to cover the through holes 2 and 13 and the through holes 23 on the side surfaces of the electrode body 8 to prevent water from entering and to bond the electrode body 8 and the chip 9 together. Here, as the filler 11, a urethane resin, an epoxy resin, or the like can be used. When the outer peripheral surface of the electrode body 8, the surface of the chip 9, and the surface of the filler 11 are formed to have a continuous smooth surface as described above, a shape having no edge or step near the sensitive portion 10 is obtained. It is possible to make it difficult for air bubbles to adhere to the portion 10, and it is possible to reduce the influence of noise of air bubbles when detecting water quality and improve the detection accuracy. Here, as described later, since the sensitive portion 10 has a curved surface shape so that air bubbles are less likely to adhere thereto, the electrode body 8 has a shape in which a flat accommodating portion 21 is provided in a part of a cylindrical shape. The electrode body 8 may be formed in a plate shape. In this case, there is an advantage that the price of the electrode body 8 is reduced. The working electrode 3 formed in this way is arranged in the working electrode portion 19 of the sensor body 1 of the water quality detection sensor A, and the communication hole 20 is inserted therethrough. It is arranged so as to protrude downward.

As shown in FIG. 1, the water quality detection sensor A
The lower part of the sensor body 1 is provided so as to be connected to a water passage pipe 24 formed therein with a water passage 15 to which water as a water quality detection target is supplied. Here, a connection hole 25 is provided at a position where the sensor body 1 is provided on the water pipe 24,
An arrangement rib 16 is provided so as to project around the connection hole 25, and the lower part of the sensor body 1 is fitted into the arrangement rib 16 and arranged on the water pipe 24. Here, the sensing part 10 of the working electrode 3 and the liquid junction ceramic 6 are immersed in water flowing through the water passage 15 through the connection hole 25. At this time, as shown in FIG. 1A, when the sensitive part 10 is disposed in the water passage 15 so that the surface of the sensitive part 10 on the chip 9 is substantially parallel to the flow of water in the water passage 15, the sensitive part 10 Since the attached air bubbles are washed away by the water stream, the adhesion of the air bubbles to the sensitive portion 10 can be more effectively prevented. Further, as shown in FIG. 1B, the sensitive part 10 may be disposed in the water passage 15 so that the surface of the sensitive part 10 on the chip 9 faces the downstream side of the flow of water in the water passage 15. In this case, the bubbles flowing in the water passage together with the water flow do not hit the sensitive portion 10, so that noise due to the impact of the bubbles does not occur, and accurate water quality detection can be performed.

Next, FIG. 4 shows a sensor A for detecting water quality according to the present invention.
2 shows a second example of the working electrode 3 used in the first embodiment. In the second example, an accommodating recess 26 is provided in a part near the lower end of the side surface of the columnar electrode body 8, and the chip 9 having the sensitive portion 10 is accommodated and held in the accommodating recess 26. Filling material 11
Is provided so as to fill the gap between the inner peripheral surface of the accommodation recess 26 and the side surface of the chip 9 and to make the surfaces of the electrode body 8, the chip 9 and the filler 11 have a continuous smooth surface. . By doing so, the step on the side surface of the chip 9 can be reduced, and the surface of the electrode body 8, the surface of the chip 9, and the surface of the filler 11 can be easily formed into a more continuous smooth surface. And the tip 9 is easily fixed to the electrode body 8. Filler 11
Is held in the storage recess 26 and hardly flows out, so that the workability in providing the chip 9 and the filler 11 in the electrode body 8 can be improved.

Next, FIG. 5 shows a sensor A for detecting water quality according to the present invention.
3 shows a third example of the working electrode 3 used for (1). In the third example, the receiving recess 26 is provided in a part near the lower end of the side surface of the cylindrical electrode body 8, while the sensitive portion 10 of the chip 9 is smoothed having the same or similar curvature as the side surface of the electrode body 8. The chip 9 is housed and held in the housing recess 26. The filler 11 fills a gap between the inner peripheral surface of the accommodation recess 26 and the side surface of the chip 9 and the side surface of the electrode body 8, the surface of the chip 9, and the surface of the filler 11 have a continuous smooth surface. It is provided so that When the sensitive portion 10 is formed in a curved shape in this manner, compared to the case where the sensitive portion 10 is formed in a flat shape, bubbles are less likely to adhere to the bubble sensitive portion 10, and the accuracy of water quality detection can be further improved. .

The working electrode 3 may have any shape other than those described above, as long as it has a small number of edges and steps near the sensitive portion 10, and may have a tapered shape as shown in FIG. 6 or a shape as shown in FIG. It may have a concave shape. Here, FIG.
In FIG. 3, the surface of the filler 11 is formed into a tapered shape in FIG. FIG. 7 also shows that the electrode body 8 is formed in a cylindrical shape, and a storage portion 27 is formed in a part near the lower end of the side surface of the electrode body 8, while the sensitive portion 10 of the chip 9 is attached to the electrode body 8. 8 is formed in a smooth concave surface having the same or similar curvature as the inner peripheral surface of the chip 8, and the chip 9 is arranged in the housing 27 so that the sensitive part 10 faces inward, and the chip 11 is filled with the filler 11. The gap between the inner circumference of the chip 27 and the side surface of the chip 9 is filled, and the inner circumferential surface of the electrode body 8, the inner surface of the chip 9, and the inner surface of the filler 9 are provided so as to be continuous and smooth. It is a thing.

FIG. 8 shows an example in which the sensor A for detecting water quality of the present invention, in which the periphery of the sensitive portion 10 is formed as a smooth surface as described above, is used for an ion water generator 28 which is one of household water treatment equipment. Show.

The ion generator 28 is configured by housing an electrolytic cell 29, a water purification cartridge 30, a calcium addition cylinder 31, a water channel switching valve 32, a water quality detection sensor A of the present invention, and the like in a housing 41. . The water purification cartridge 30 has a filter member 42 made of antibacterial activated carbon and a filter member 43 made of a hollow fiber membrane. The two types of filter members 42 and 35 are housed in a single cartridge, respectively. Everything can be replaced.

In the electrolytic cell 29, an electrode chamber 34 in which an electrode 33 is installed and an electrode chamber 36 in which an electrode 35 is installed are partitioned by a diaphragm 32. Inflow channels 37 and 38 are formed on the bottom side.
Outflow channels 39 and 40 are provided on the upper side. These outflow passages 39 and 40 are connected to the discharge pipes 44 and 4 through the water passage switching valve 32.
5 is connected. Here, the inflow channel 37 and the outflow channel 40 are connected to the electrode chamber 34 in the diaphragm 32 surrounding one electrode 33.
The inflow passage 38 and the outflow passage 39 communicate with the electrode chamber 36 surrounding the other electrode 35.
Is smaller than the inflow passage 38, and is adjusted so that the flow rate flowing into the electrode chamber 34 side is smaller than the flow rate flowing into the electrode chamber 36 side by a ratio of 1: 3 to 1: 4.
The water channel switching valve 32 connects the outflow channel 40 and the discharge tube 45 when the outflow channel 39 communicates with the discharge tube 44, and connects the outflow channel 40 with the outflow channel 39 and the discharge tube 45 when the outflow channel 39 communicates with the discharge tube 45. It is constituted by an electromagnetic rotary valve or a motor type switching valve so as to communicate with the discharge pipe 44.

A thermistor 47 and a constant flow valve 49 are connected between the switching lever unit 51 connected to the water tap 50 and the water purification cartridge 30, and a flow detection sensor is provided between the water purification cartridge 30 and the electrolytic tank 29. 46
And an electromagnetic valve 48 are arranged. Of the pipes that individually connect the electromagnetic valve 48 and the inflow paths 37 and 38, the inflow path 3
7 is provided with a calcium addition cylinder 31 in the middle of the tube. The solenoid valve 48 is connected to the drain 52, and when the stoppage of the water flow is detected by the flow rate detection sensor 46, the solenoid valve 48 opens after a certain period of time to open the inside of the electrolytic cell 29 and other piping systems. Residual water is discharged from a discharge port 44. A sensor A for detecting water quality of the present invention is disposed in the middle of the discharge pipe 45.

Next, the flow of water when generating electrolytic water from tap water will be described. When the handle lever unit 51 connected to the water tap 50 is switched so that water flows toward the water purification cartridge 30, the water purification cartridge 3
0 and the inflow passages 37 and 38 through the calcium addition cylinder 31.
Water is introduced into the electrolytic cell 29 from the above, and electrolysis is performed. The application of the electrolytic voltage in the electrolytic cell 29 is started when the flow of water is detected by the flow rate detection sensor 46. .

If an instruction to obtain alkaline water is given, the electrode 33 of the electrolytic cell 29 is connected to the anode,
Electrolysis voltage is applied so that the electrode 35 becomes a cathode, alkaline water is generated in the electrode chamber 36, and acidic water is generated in the electrode chamber 34. Alkaline water is obtained on the outlet channel 39 side and acidic water is obtained on the outlet channel 40 side. Can be At this time, the water channel switching valve 32 is connected to the outflow channel 39.
And the discharge pipe 45 and the outflow passage 40 and the discharge pipe 44 are connected to each other. The alkaline water is discharged to the discharge pipe 45 side for drinking and the like, and the acidic water is discharged to the discharge pipe 44. Is discharged to the side.

When an instruction to obtain acidic water is given, the following two methods are performed in accordance with the indicated degree of electrolysis of acidic water.
One stream of water. First, in the case of a weakly acidic water, an electrolytic voltage is applied so that the electrode 33 in the electrolytic cell 29 becomes a cathode and the electrode 35 becomes an anode, and alkaline water in the electrode chamber 34 and acid water in the electrode chamber 36. The alkaline water is generated on the outflow path 40 side, and the weakly acidic water is obtained on the outflow path 39 side. At this time, the water channel switching valve 32 is set in the same state as described above, and the weakly acidic water is discharged to the discharge pipe 45 to be used as astringent water or the like, and the alkaline water is discharged to the discharge pipe 44.
Is discharged to the side.

In the case of strongly acidic ionic water, an electrolytic voltage is applied such that the electrode 33 in the electrolytic cell 29 becomes an anode and the electrode 35 becomes a cathode, and the acidic water in the electrode chamber 34 and the alkaline water in the electrode chamber 36. Is generated, and alkaline water is obtained on the outflow channel 39 side and strongly acidic water is obtained on the outflow channel 40 side. At this time, the water path switching valve 32 is switched to a state in which the outflow path 39 communicates with the discharge pipe 44 and the outflow path 40 communicates with the discharge pipe 45, and the strong acid water is discharged to the discharge pipe 45 and sterilized. The alkaline water is discharged to the discharge pipe 44 side. As described above, when the strongly acidic water is discharged from the discharge pipe 45, the acidic water is generated in the electrode chamber 34 using the electrode 33 as the anode, as described above. This is because it is easy to obtain the strongly acidic water in the electrode chamber 34 because the flow rate of the water is reduced by narrowing down the inflow path 38 on the chamber 36 side.

The electrolytic water produced in the electrolytic cell 29 and discharged from the discharge pipe 45 as described above is supplied to the electrolytic tank 29 and the discharge pipe 4.
The water quality is measured by the water quality detection sensor A of the present invention disposed between the sensor 5 and the sensor 5. This measurement output is amplified by the amplifier 2 of the water quality detection sensor A and output to the control unit.
This control unit is configured to be able to control the electrolytic voltage applied to the electrodes 33 and 35 of the electrolytic cell 29, and to control the target p of the electrolytic water generated in the electrolytic cell 29.
A comparison circuit for comparing the H value with the pH value of the electrolyzed water measured by the electrochemical water quality measuring device 20 is provided. Then, the electrodes 33 and 35 are adjusted so that the actually measured pH value of the electrolyzed water derived from the detection output from the water quality detection sensor A matches the target pH value.
It is possible to perform feedback control of the electrolytic voltage applied to the substrate. Also, a display unit is connected to the control unit, and the measured pH value of the electrolyzed water can be displayed on the display unit.

[0026]

As described above, in the sensor for detecting water quality according to the first aspect of the present invention, the filler for preventing water from entering between the electrode body and the side surface of the chip having the sensitive portion is provided. In the water quality detection sensor A including the working electrode provided and the comparison electrode, the electrode body, the tip, and the filler are formed so as to have a smooth surface. The shape has no edges or steps, and the generation of noise due to bubbles can be suppressed by reducing the adhesion of bubbles to the sensitive portion, and stable output detection can be performed.

Further, in the water quality detecting sensor according to the second aspect of the present invention, since the receiving body for receiving and holding the chip having the sensitive portion is provided in the electrode body of the working electrode, the step on the side of the chip can be reduced. The electrode body, the chip, and the filler can be more easily formed into a smooth surface, and the chip can be more easily fixed to the electrode body. Thus, the workability when providing the tip and the filler in the electrode body can be improved.

Further, in the sensor for detecting water quality according to the third aspect of the present invention, by forming the sensitive portion into a smooth curved surface, the adhesion of bubbles to the sensitive portion can be further reduced.

[Brief description of the drawings]

FIGS. 1A and 1B are cross-sectional views illustrating an example of an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a working electrode.

FIG. 3 is a plan sectional view of the working electrode of FIG. 2;

FIG. 4 is a plan sectional view showing another example of the working electrode.

FIG. 5 is a plan sectional view showing still another example of a working electrode.

FIG. 6 is a plan sectional view showing still another example of the working electrode.

FIG. 7 is a plan sectional view showing still another example of a working electrode.

FIG. 8 is a schematic diagram showing an example of an ionized water generator using the water quality detection sensor of the present invention.

[Explanation of symbols]

 A sensor for detecting water quality 3 working electrode 4 reference electrode 8 electrode body 9 chip 10 sensitive part 11 filler 26 filling recess

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] August 24, 1998 (1998.8.2
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

According to a first aspect of the present invention, there is provided a water quality detection sensor for preventing water from entering between an electrode body and a side surface of a chip having a sensing portion. In the water quality detection sensor A including the working electrode 3 provided with the filler 11 and the comparison electrode 4, the electrode body 8 , the tip 9, and the filler 11 are formed to have a smooth surface. It is characterized by comprising.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

The ion generator 28 is configured by housing an electrolytic cell 29, a water purification cartridge 30, a calcium addition cylinder 31, a water channel switching valve 53 , a water quality detection sensor A of the present invention, and the like in a housing 41. . The water purification cartridge 30 has a filter member 42 made of antibacterial activated carbon and a filter member 43 made of a hollow fiber membrane. The two types of filter members 42 and 35 are housed in a single cartridge, respectively. Everything can be replaced.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

In the electrolytic cell 29, an electrode chamber 34 in which an electrode 33 is installed and an electrode chamber 36 in which an electrode 35 is installed are partitioned by a diaphragm 32. Inflow channels 37 and 38 are formed on the bottom side.
Outflow channels 39 and 40 are provided on the upper side. These outflow passages 39, 40 are connected to discharge pipes 44, 4 via water passage switching valve 53.
5 is connected. Here, the inflow channel 37 and the outflow channel 40 are connected to the electrode chamber 34 in the diaphragm 32 surrounding one electrode 33.
The inflow passage 38 and the outflow passage 39 communicate with the electrode chamber 36 surrounding the other electrode 35.
Is smaller than the inflow passage 38, and is adjusted so that the flow rate flowing into the electrode chamber 34 side is smaller than the flow rate flowing into the electrode chamber 36 side by a ratio of 1: 3 to 1: 4.
The water channel switching valve 53 connects the outflow channel 40 and the discharge tube 45 when the outflow channel 39 communicates with the discharge pipe 44, and connects the outflow channel 40 when the outflow channel 39 communicates with the discharge pipe 45. It is constituted by an electromagnetic rotary valve or a motor type switching valve so as to communicate with the discharge pipe 44.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

If an instruction to obtain alkaline water is given, the electrode 33 of the electrolytic cell 29 is connected to the anode,
Electrolysis voltage is applied so that the electrode 35 becomes a cathode, alkaline water is generated in the electrode chamber 36, and acidic water is generated in the electrode chamber 34. Alkaline water is obtained on the outlet channel 39 side and acidic water is obtained on the outlet channel 40 side. Can be At this time, the water channel switching valve 53 is connected to the outflow channel 39.
And the discharge pipe 45 and the outflow passage 40 and the discharge pipe 44 are connected to each other. The alkaline water is discharged to the discharge pipe 45 side for drinking and the like, and the acidic water is discharged to the discharge pipe 44. Is discharged to the side.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

When an instruction to obtain acidic water is given, the following two methods are performed in accordance with the indicated degree of electrolysis of acidic water.
One stream of water. First, in the case of a weakly acidic water, an electrolytic voltage is applied so that the electrode 33 in the electrolytic cell 29 becomes a cathode and the electrode 35 becomes an anode, and alkaline water in the electrode chamber 34 and acid water in the electrode chamber 36. The alkaline water is generated on the outflow path 40 side, and the weakly acidic water is obtained on the outflow path 39 side. At this time, the water channel switching valve 53 is set in the same state as described above, and the weakly acidic water is discharged to the discharge pipe 45 to be used as astringent water or the like, and the alkaline water is discharged to the discharge pipe 44.
Is discharged to the side.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

In the case of strongly acidic ionic water, an electrolytic voltage is applied such that the electrode 33 in the electrolytic cell 29 becomes an anode and the electrode 35 becomes a cathode, and the acidic water in the electrode chamber 34 and the alkaline water in the electrode chamber 36. Is generated, and alkaline water is obtained on the outflow channel 39 side and strongly acidic water is obtained on the outflow channel 40 side. At this time, the water channel switching valve 53 is switched to a state in which the outflow channel 39 communicates with the discharge pipe 44 and the outflow channel 40 communicates with the discharge pipe 45. The alkaline water is discharged to the discharge pipe 44 side. As described above, when the strongly acidic water is discharged from the discharge pipe 45, the acidic water is generated in the electrode chamber 34 using the electrode 33 as the anode, as described above. This is because it is easy to obtain the strongly acidic water in the electrode chamber 34 because the flow rate of the water is reduced by narrowing down the inflow path 38 on the chamber 36 side.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

The electrolytic water produced in the electrolytic cell 29 and discharged from the discharge pipe 45 as described above is supplied to the electrolytic tank 29 and the discharge pipe 4.
The water quality is measured by the water quality detection sensor A of the present invention disposed between the sensor 5 and the sensor 5. This measurement output is amplified by the amplifier 2 of the water quality detection sensor A and output to the control unit.
This control unit is configured to be able to control the electrolytic voltage applied to the electrodes 33 and 35 of the electrolytic cell 29, and to control the target p of the electrolytic water generated in the electrolytic cell 29.
H value and pH of electrolyzed water measured by water quality sensor A
Built-in value comparison circuit. Then, feedback control of the electrolytic voltage applied to the electrodes 33 and 35 can be performed so that the measured pH value of the electrolyzed water derived from the detection output from the water quality detection sensor A matches the target pH value. . Also, a display unit is connected to the control unit, and the measured pH value of the electrolyzed water can be displayed on the display unit.

[Procedure amendment 8]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8

Claims (3)

[Claims] 1. A sensor for detecting water quality, comprising: a working electrode constituted by providing a filler for preventing water from entering between an electrode body and a side surface of a chip having a sensitive portion; and a reference electrode. 3. The water quality detection sensor according to claim 1, wherein the electrode body, the chip, and the filler are formed to have a smooth surface. 2. The sensor for detecting water quality according to claim 1, wherein an accommodation recess for accommodating and holding a chip having a sensitive portion is provided in an electrode body of the working electrode. 3. The sensor for detecting water quality according to claim 1, wherein the sensitive portion is formed into a smooth curved surface.