JP2002189010A - Electrode for resistivity meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode for a resistivity meter, capable of suppressing cost increase by suppressing time and labor necessary for assembling. SOLUTION: The electrode 1 of the resistivity meter is provided with an internal electrode, an external electrode, and a temperature-detecting part 5. The internal electrode is formed into cylindrical form and provided with a temperature-detecting part insertion hole. The external electrode is formed into a cylindrical form. The temperature-detecting part 5 is provided with a temperature sensor element 21, a lead wire 23, a printed wiring board 24, an internal electrode cable 6, an external electrode cable 7, a shield wire 28, and a cable 27. One end of the lead wire 23 is connected to a temperature-sensing part 21a of a temperature sensor element 21, and the other end is connected to the printed wiring board 24. The external electrode cable 7 is connected to the external electrode and the printed wiring board 24. The internal electrode cable 6 is connected to the printed wiring board 24. The cable 27 is connected to the printed wiring board 24. In the temperature-detecting part 5, at least the temperature sensor element 21 is inserted in the temperature-detecting part insertion hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various types of manufacturing equipment such as semiconductor cleaning equipment, water quality management in various fields such as industrial machinery, agriculture, food, and medical care, insulation of nuclear power plant cooling water, and various other applications. The present invention relates to an electrode of a resistivity meter used for controlling the concentration of a chemical solution.

[0002]

2. Description of the Related Art Various types of manufacturing equipment such as semiconductor cleaning equipment, water quality management in various fields such as industrial machinery, agriculture, food and medical care, insulation of cooling water in nuclear power plants, and concentration management of various chemicals. In the above, in order to measure the purity of pure water and the concentration of the electrolyte solution, a resistivity meter for measuring the resistivity of the pure water and the electrolyte solution is used. The resistivity meter includes, for example, an electrode 101 shown in FIG.

The electrode 101 of the resistivity meter illustrated in FIG.
Are the inner electrode 102 as the electrode member, the outer electrode 103 as the electrode member, the inner electrode 102 and the outer electrode 1
03, the inner electrode cable 106 electrically connected to the inner electrode 102, and the outer electrode 1
An external electrode cable 107 electrically connected to the external electrode 03 and a temperature detection unit (not shown) are provided.

[0004] The inner electrode 102 is formed in a columnar shape. The inner electrode 102 has a temperature detecting portion insertion hole 102d that is concave from the end face located on the base end portion 102a side toward the tip end portion 102b side.

The outer electrode 103 is formed in a tubular shape having conductivity and having an inner diameter larger than the outer diameter of the inner electrode 102. The inner electrode 102 and the outer electrode 103 are arranged coaxially with each other and in a state where the inner electrode 102 is inserted into the outer electrode 103. Inner electrode 102 and outer electrode 10
Numeral 3 is made of metal or carbon having conductivity.

The supporting portion 104 supports the base portions 102a and 103a of the inner electrode 102 and the outer electrode 103, respectively.

[0007] One end of the inner electrode cable 106 is electrically connected to the base 102a of the inner electrode 102. The other end of the inner electrode cable 106 is electrically connected to an arithmetic unit (not shown) or the like.

[0008] One end of the outer electrode cable 107 is electrically connected to the outer electrode 103. Outer electrode cable 10
The other end of 7 is electrically connected to an arithmetic unit (not shown).

The temperature detecting section (not shown) includes a pair of temperature sensor elements for temperature compensation, and lead wires electrically connected to these temperature sensor elements. The temperature sensor element is located in the temperature detection portion insertion hole 102d and the inner electrode 1
02 is disposed at the tip 102b. The temperature sensor element has a temperature sensing part for measuring a temperature.

A cable extending from the distal end 102b of the inner electrode 102 to the proximal end 102a is connected to the lead wire. The cable is connected to the arithmetic device and the like. The cable transmits information corresponding to the temperature of the distal end portion 102b of the inner electrode 102 detected by the temperature sensor element to the arithmetic device.

A support 104 for the electrode 101 of the resistivity meter
Inside, a space 116 is formed. This space 11
6 is filled with an epoxy resin 132. The epoxy resin 132 prevents the above-mentioned electrolyte solution in the space 116 and the intrusion of moisture generated by dew condensation on the surface of the support portion 104 when used at a low temperature.

According to the above-described configuration, the electrode 1 of the resistivity meter is used.
01, at least the tip portions 102b, 103b of the inner electrode 102 and the outer electrode 103 are arranged in the flow path of the electrolyte solution to be measured, and these electrodes 102, 103
The resistivity of the electrolyte solution is measured by measuring the electrical resistance between them.

At this time, information corresponding to the temperature of the electrolyte solution is transmitted from the temperature sensing portion of the temperature sensor element to the arithmetic unit via the cable. Then, the arithmetic device compensates the temperature of the electrolyte solution, and calculates the resistivity of the electrolyte solution at a predetermined constant temperature.

[0014]

However, in the electrode 101 of the resistivity meter described above, it is necessary to connect the temperature sensor element of the temperature detecting section to a lead wire or to connect the lead wire to the cable. there were. These connections are made, for example, in the temperature detection unit insertion hole 102d.
It has to be performed in a very narrow space, which requires skill and requires a long time.

In order to facilitate the assembly of the temperature detecting section, the length of the lead wire is increased and the length of the electrode 10 is increased.
It is also conceivable to connect the lead wire and the cable outside the cable. In this case, after the connection, the lead wire and the cable are inserted into the temperature detection unit insertion hole 102d.

Then, when the lead wire and the cable are inserted into the temperature detecting portion insertion hole 102d or when the epoxy resin 132 is filled, the lead wire and the cable may be disconnected. For this reason, it is difficult to reliably extract information corresponding to the temperature of the electrolyte solution.

As described above, in the conventional temperature detecting section of the electrode 101, it takes time and effort to assemble, and it may be difficult to extract information corresponding to the temperature of the electrolyte solution.

In order to solve the above-mentioned problem, the applicant of the present invention has proposed a temperature detecting section 205 (shown in FIGS. 8 to 10) described in Japanese Patent Application No. 11-309596. The temperature detecting unit 205 illustrated in FIG. 8 includes a temperature sensor element 221, a plurality of cables 228, a tubular spring 225, a retaining ring 220, and a plurality of insulating tubes 2.
06 and the like.

The temperature sensor element 221 is composed of the above-mentioned thermistor or the like.
Distributed to. A pair of thermistor lead wires is connected to the temperature sensor element 221. The cable 228 has a larger diameter than the thermistor lead 227. The cable 228 is connected to each of the thermistor lead wires 227,
It is connected to the tubular spring 225 and the retaining ring 220. The cable 228 and the thermistor lead 227
As shown in FIG. 10, they are fixed to each other by brazing using solder 223 or the like.

The tubular spring 225 is inserted into the temperature detecting portion insertion hole 102d of the inner electrode 102,
Electrically connected to A cable 228 is connected to the tubular spring 225. The retaining ring 220 is supported by the support 1
04 and is electrically connected to the outer electrode 103. A cable 228 is connected to the retaining ring 220.

The insulating tube 206 includes a plurality of cables 2
28 and a cover that covers the thermistor lead 227 shown in FIG. 9 and covers a joint between the thermistor lead 227 and the cable 228 shown in FIG.
Is used. Further, the thermistor lead 227
Are connected to the synthetic resin 22
9 and the like.

The above-mentioned temperature detecting section 205 is connected to the thermistor lead 227 of the temperature sensor element 221 and the cable 22.
8 are connected and assembled, and then inserted into the temperature detection insertion hole 102d. Thus, the temperature detection unit 205 suppresses the skill level and the required time for the worker when assembling the electrode 101.

However, when assembling the temperature detecting section 205, it is necessary to connect wires having different outer diameters, such as a connection between the thermistor lead wire 227 and the cable 228. For this reason, skill is required for the assembly work. Further, it is necessary to cover the core wire of the thermistor lead wire 227 and the solder 223 with the insulating tube 206 and the like, so that the time required for the work tends to be longer and the number of components increases.

As described above, in the temperature detecting section 205,
Although the labor and required time required for attaching to the electrode 101 can be reduced, the labor and required time required for assembling the temperature detection unit 205 itself tend to increase. For this reason, even if the temperature detecting unit 205 is used, the labor and time required for assembling the electrode 101 cannot always be suppressed. Therefore, even if the temperature detection unit 205 is used, the cost of the electrode 101 tends to increase.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electrode of a resistivity meter which can suppress labor and time required for assembling and suppress an increase in cost.

[0026]

According to a first aspect of the present invention, there is provided an electrode of a resistivity meter according to the first aspect of the present invention, wherein a plurality of electrode members include a flow path of an electrolyte solution to be measured. In the electrode of the resistivity meter which is arranged at a predetermined interval and measures the resistivity of the electrolyte solution based on the electric resistance between the electrode members, at least one of the electrode members is formed in a columnar shape. Provided with a hole along the direction from the base end toward the distal end, a temperature detection unit is inserted into the hole and takes out information according to the temperature of the electrolyte solution, the temperature detection unit, A temperature sensor element that detects information according to the temperature of the electrolyte solution, an electric wire having one end connected to the temperature sensor element, a rigid printed wiring board connected to the other end of the electric wire, and the printed wiring board. A second electric wire having one end connected thereto. In a state where the temperature sensor element, the electric wire, the printed wiring board, and the second electric wire are sequentially positioned from the distal end toward the base end, at least the temperature sensor element is inserted into the hole. It is characterized by having.

The electrode of the resistivity meter according to the present invention according to claim 2 is the electrode of the resistivity meter according to claim 1, wherein
The electric wire is larger in diameter than the electric wire, and the printed wiring board includes an insertion portion in the hole inserted into the hole, and an exposed portion outside the hole exposed outside the hole, The width of the insertion portion is smaller than the inner diameter of the hole, the width of the exposed portion outside the hole is larger than the inner diameter of the hole, and the second electric wire is connected to the exposed portion outside the hole.

According to a third aspect of the present invention, the electrode of the resistivity meter according to the first or second aspect is the electrode of the resistivity meter according to the first or second aspect, wherein the temperature sensor element, the electric wire, and the printed wiring board are connected to each other. It is characterized in that a portion to which the electric wire is connected is covered with a synthetic resin.

According to a fourth aspect of the present invention, the electrode of the resistivity meter according to the present invention is the electrode of the second or third aspect of the invention, wherein the temperature detecting section has a tubular shape and the printed wiring is provided. A plate is insertable inside, and a connection member is provided which, when inserted into the hole, comes into contact with the inner peripheral surface of the hole to electrically connect to the one electrode member.

According to a fifth aspect of the present invention, the electrode of the resistivity meter according to the present invention is the electrode of the resistivity meter according to the fourth aspect, wherein the printed wiring board is formed of a connecting member having a hole insertion portion inserted inside. A concave groove in which an edge can be fitted is provided in the exposed portion outside the hole, and a wiring pattern is provided on an edge of the concave groove, and the connection member, when the edge is fitted in the concave groove, It is characterized by being electrically connected to the wiring pattern of the printed wiring board.

According to a sixth aspect of the present invention, there is provided an electrode of the resistivity meter according to the fifth aspect, wherein the concave grooves are spaced from each other along a width direction of the printed wiring board. The connecting member has an outer diameter that is elastically deformable so that the outer diameter can expand and contract, and the outer diameter in the initial state is larger than the inner diameter of the hole and the inner diameter is the pair of concave portions. It is characterized in that it is larger than the interval between the grooves.

According to the electrode of the resistivity meter according to the first aspect of the present invention, an electric wire to which a temperature sensor element is connected is connected to the printed wiring board, and a second electric wire is connected to the printed wiring board.
The temperature detecting means can be assembled. in this way,
When assembling the temperature detecting unit, there is no need to connect wires.

According to the electrode of the resistivity meter according to the second aspect of the present invention, the second electric wire is connected to the exposed portion outside the hole, which is wider than the insertion portion in the hole inserted into the hole. In this way, the second electric wire larger in diameter than the electric wire is connected to the exposed portion outside the hole having a relatively large width.

According to the electrode of the resistivity meter according to the third aspect of the present invention, the synthetic resin covers the temperature sensor element, the electric wire, and the portion where the electric wire of the printed wiring board is connected. Therefore, there is no need to insert these connection points into the insulating tube made of an insulator.

According to the electrode of the resistivity meter according to the present invention, when a connection member is inserted into the hole, the connection member is electrically connected to one electrode member having the hole. Therefore, it is not necessary to directly connect an electric wire or the like to the one electrode member or the like in order to extract information based on the resistivity of the electrolyte solution from the one electrode member.

According to the electrode of the resistivity meter according to the present invention, when the connecting member is inserted into the hole and the edge of the connecting member is fitted into the concave groove of the printed wiring board, One electrode having a hole is electrically connected to the second electric wire. For this reason. In order to extract information based on the resistivity of the electrolyte solution from the one electrode member, it is not necessary to directly connect wires or the like to the one electrode member or the like, and it is not necessary to connect wires.

According to the electrode of the resistivity meter according to the present invention, the outer diameter of the connecting member in the initial state is larger than the inner diameter of the hole, and the inner diameter is larger than the distance between the pair of concave grooves. large. For this reason, when the connection member is inserted into the hole, the connection member surely comes into contact with the inner peripheral surface of the hole and is reliably electrically connected to one electrode member having the hole. Further, when the connection member is fitted into the concave groove, the connecting member surely contacts the edge of the concave groove.
For this reason, when the connection member is fitted into the concave groove, the wiring pattern of the printed wiring board and the connection member are reliably electrically connected.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The electrode 1 of the resistivity meter according to one embodiment of the present invention shown in FIG. 1 and the like is used in various fields such as a manufacturing apparatus used in various processes such as a semiconductor cleaning apparatus, an industrial machine, agriculture, food, and a medical field. It is used for water quality control such as purity, insulation of cooling water for nuclear power plants, and concentration control of various chemicals as electrolytes. The resistivity meter using the electrode 1 is a device that measures the resistivity of the electrolyte solution in order to measure the purity of the electrolyte solution described above as an object to be measured.

The electrode 1 of the resistivity meter is, as shown in FIG.
An inner electrode 2 as an electrode member, an outer electrode 3 as an electrode member, and a support 4 for supporting the inner electrode 2 and the outer electrode 3
And a temperature detector 5 for extracting information corresponding to the temperature of the electrolyte solution.

The inner electrode 2 is formed in a column shape. The inner electrode 2 integrally includes a small diameter portion 2a having a relatively small outer diameter and a large diameter portion 2b having a relatively large outer diameter. The small diameter portion 2a and the large diameter portion 2b are coaxially connected to each other in series.

The inner electrode 2 is arranged in such a state that the large diameter portion 2b is located on the distal end side of the electrode 1 of the resistivity meter and the small diameter portion 2a is located on the proximal end side. The inner electrode 2 is connected to the small-diameter portion 2a.
A temperature detecting portion insertion hole 2d as a hole described in the present specification, which is concave from the end face 2c located on the side toward the large diameter portion 2b, is provided.

The temperature detecting portion insertion hole 2d is coaxially arranged with each of the small diameter portion 2a and the large diameter portion 2b. The temperature detection section insertion hole 2d extends from the end face 2c toward the tip 2g of the inner electrode 2. The temperature detecting portion insertion hole 2d is formed over an end face 2c located on the base end portion 2f side of the inner electrode 2 and a distal end portion 2g of the inner electrode 2. Note that the temperature detection section insertion hole 2d is
Although it is open at c, it is not open at the end face 2e located on the tip 2g side of the inner electrode 2.

The outer electrode 3 is formed in a tubular shape whose inner diameter is larger than the outer diameter of the large diameter portion 2b of the inner electrode 2. The inner electrode 2 and the outer electrode 3 are arranged coaxially with each other and with the inner electrode 2 inserted into the outer electrode 3. The inner electrode 2 is arranged such that the end face 2 e of the large diameter portion 2 b is located slightly behind the outer face 3 a than the end face 3 a located on the tip 3 c side of the outer electrode 3. Inner electrode 2 and outer electrode 3
Are made of conductive metal or carbon.

The support section 4 supports the base ends 2f and 3b of the inner electrode 2 and the outer electrode 3, respectively. The support portion 4 includes an inner electrode holder 10, an outer electrode holder 11, a base end cap 12, an O-ring 30, and the like.

The inner electrode holder 10 is formed in a circular tube shape. The inner electrode holder 10 integrally includes a small diameter portion 10a having a relatively small outer diameter and a large diameter portion 10b having a relatively large outer diameter. The small diameter portion 10a and the large diameter portion 10b are coaxial with each other and connected to each other in series.

The inner diameter of the small-diameter portion 10a is
Is formed substantially equal to the outer diameter of the small diameter portion 2a. The outer diameter of the small diameter portion 10a is formed substantially equal to the outer diameter of the large diameter portion 2b of the inner electrode 2.

The inner diameter of the large diameter portion 10b is the same as that of the small diameter portion 1b.
0a is formed substantially equal to the outer diameter. That is, the inner diameter of the large diameter portion 10b is formed to be larger than the inner diameter of the small diameter portion 10a. The outer diameter of the large diameter portion 10b is formed substantially equal to the outer diameter of the outer electrode 3. For this reason, the inner electrode holder 1
On the inner circumference of 0, a step surface 10c is formed between the small diameter portion 10a and the large diameter portion 10b.

The step surface 10c is formed along both end surfaces 10d and 10e located at both end portions of the inner electrode holder 10. The inner electrode holder 10 is formed from an insulating resin or ceramic.

The inner electrode holder 10 is configured such that the small-diameter portion 10a is located near the inner electrode 2 and the large-diameter portion 10b is It is arranged by fitting to the outer periphery of the portion 2a.

The outer electrode holder 11 is formed in a tubular shape. The outer electrode holder 11 integrally includes a small diameter portion 11a having a relatively small outer diameter and a large diameter portion 11b having a relatively large outer diameter. The small diameter portion 11a and the large diameter portion 11b are coaxial with each other and connected in series with each other.

The inner diameter of each of the small-diameter portion 11a and the large-diameter portion 11b, that is, the inner diameter of the outer electrode holder 11 is substantially equal to the outer diameter of the outer electrode 3. The outer electrode holder 11
It is made of a conductive metal or the like.

The outer electrode holder 11 holds the outer electrode 3 in a state where the large-diameter portion 11b is located near the inner electrode 2 and the small-diameter portion 11a is located away from the inner electrode 2. The inner electrode holder 10 is fitted to the outer periphery of the large-diameter portion 10b while being fitted to the outer periphery of the end portion 3b.

An O-ring 13 is provided between the outer electrode holder 11 and the inner electrode holder 10 to maintain a liquid-tight space therebetween.
Is provided. An O-ring 14 is provided between the inner electrode 2 and the inner electrode holder 10 to keep the space between the inner electrode 2 and the inner electrode holder 10 liquid-tight. These O-rings 13 and 14 are made of an elastic material such as rubber.

Further, the inner electrode 2 and the inner electrode holder 1
An intermediate member 15 is provided between the inner electrode holder 10 and the outer electrode 3 along the longitudinal direction of the zero. The intermediate member 15 is formed in an annular shape. The intermediate member 15
The inner diameter is formed substantially equal to the outer diameter of the small diameter portion 10a, and the outer diameter is formed substantially equal to the inner diameter of the outer electrode holder 11.

The intermediate member 15 is fitted on the outer periphery of the small diameter portion 10a and is fitted on the inner periphery of the outer electrode holder 11. The intermediate member 15 is made of an insulating resin or ceramic. In addition, the intermediate member 15 is
0a and the inner electrode 2 and the outer electrode holder 11, the inner electrode 2 and the outer electrode 3 are spaced apart from each other by a predetermined distance t along the radial direction of the electrodes 2 and 3. (Shown in FIG. 1).

The base end cap 12 is formed in a bottomed cylindrical shape having a disk portion 12a and a cylindrical portion 12b. Disk part 1
2a is formed in a disk shape. The cylindrical portion 12b is formed in a cylindrical shape and is continuous with the periphery of the disk portion 12a.

The base cap 12 is formed of a known synthetic resin such as polyamide resin (nylon). The proximal end cap 12 is arranged such that the cylindrical portion 12a is fitted on the outer periphery of the small diameter portion 11a of the outer electrode holder 11. The proximal end cap 12 is configured such that the cylindrical portion 12b is formed of the small diameter portion 11a.
Are fixed by bonding with a well-known epoxy adhesive.

The base end cap 12 has a round hole 12c penetrating the disk portion 12a. The round hole 12c has a substantially circular planar shape. The round hole 12c is arranged coaxially with the disk portion 12a. An electric wire cable 26 of the temperature detection unit 5 described later passes through the round hole 12c.

The O-ring 30 is formed in an annular shape from an elastic body such as silicone rubber. O-ring 30
Has a circular cross section along the axis. The O-ring 30 is formed to have an inner diameter smaller than the outer diameter of the electric cable 26 and an outer diameter smaller than the inner diameter of the small-diameter portion 11 a of the outer electrode holder 11 in an initial state in which the O-ring 30 is not elastically deformed.

The O-ring 30 is formed to have a circular cross section having a diameter of 3 mm or more and 50% or more of the outer diameter of the electric cable 26. As described above, the O-ring 30 has a relatively large circular cross-sectional shape.

The O-ring 30 has an electric cable 26 inside.
And is arranged inside the small diameter portion 11 a of the outer electrode holder 11, that is, inside the cylindrical portion 12 b of the base end cap 12.
When the O-ring 30 is provided in the base cap 12, the space between the electric cable 26 and the inner peripheral surface of the small diameter portion 11a of the outer electrode holder 11 is kept liquid-tight, Prevents electrolyte solution from entering.

Further, the supporting portion 4 is provided between the inner peripheral surface 10 f of the large diameter portion 10 b of the inner electrode holder 10 and the outer electrode holder 1.
1 and the disk portion 12a of the proximal end cap 12
A space 16 surrounded by the like is formed therein. In the space 16, the temperature detection unit insertion hole 2d is opened.

The space 16 houses a first retaining ring 19 inside. The first retaining ring 19 is made of a well-known steel such as stainless steel and is formed in an annular shape. The first retaining ring 19 passes through the small-diameter portion 2a of the inner electrode 2 inside the
b. The inner edge of the first retaining ring 19 is fitted to the outer periphery of the small diameter portion 2a of the inner electrode 2, and is fixed to the inner electrode 2 and the like.

As shown in FIG. 1, the resistivity meter includes a temperature sensor element 21, a printed wiring board 24, a tubular spring member 25, cables 6, 7, 27, a shield wire 28, and the like. And an electrical signal extracting unit according to the present invention, which is constituted by the main components of the present invention.

As shown in FIGS. 1 and 2, the temperature detecting section 5 includes a temperature sensor element 21 for temperature compensation, a hard printed wiring board 24, and a tubular spring member 25 as a connecting member.
A second retaining ring 20; an inner electrode cable 6 electrically connected to the inner electrode 2; an outer electrode cable 7 electrically connected to the outer electrode 3; a plurality of cables 27; 28. The inner electrode cable 6
, The cable 27 and the shielded wire 28 constitute the second electric wire described in this specification.

The temperature detector 5 includes a temperature sensor element 21 and
Lead wires 23 described later, insertion portions 35 in holes of the printed wiring board 24 described later, cables 6, 27, and shield wires 28
And are arranged in the temperature detection unit insertion hole 2d in a state of being sequentially positioned from the distal end 2g to the proximal end 2f. Thus, in the temperature detecting section 5, at least the temperature sensor element 21 is inserted into the temperature detecting section insertion hole 2d.

The temperature sensor element 21 is arranged in the insertion hole 2d of the temperature detecting portion and at the tip 2g of the inner electrode 2. The temperature sensor element 21 includes a temperature sensing unit 21 for measuring a temperature.
a, a lead wire 23 as an electric wire described in this specification,
It has.

The temperature sensor element 21 is formed by a thermistor or a winding having a temperature-sensitive portion 21a having a disk shape, a pellet shape, a bead shape, or a shape having a surface similar thereto, a metal temperature measuring resistor formed by thin film technology, or the like. It is configured. The temperature sensor element 21 has a surface portion of the temperature sensing portion 21a,
In the temperature detecting section insertion hole 2d, it is arranged parallel to the flow path of the electrolyte solution. The temperature sensor element 21
Information corresponding to the temperature of the electrolyte solution is detected.

The lead wire 23 is a so-called bare electric wire whose core wire made of a dumet wire, copper, nickel, platinum wire or the like is exposed. The lead wire 23 is provided as a pair. One end of each of the lead wires 23 is electrically connected to the temperature sensing portion 21a. The lead wire 23 is connected to the inner electrode 2
Extending from the distal end portion 2g toward the proximal end portion 2f of the inner electrode 2 and disposed in the temperature detecting portion insertion hole 2d.

The printed wiring board 24 includes a substrate having an insulating property such as a glass epoxy resin, and a wiring pattern made of a thin film of copper or the like provided on the substrate. The wiring pattern electrically connects a portion formed at an inner edge of each lead wire mounting hole 37 described later and a portion formed at an inner edge of each cable mounting hole 40 described later. The wiring pattern includes a portion formed at an inner edge of an outer electrode cable mounting hole 39 described later, a portion formed at an inner edge of one of the plurality of cable mounting holes 40, and
Are electrically connected. The wiring pattern electrically connects a portion formed at an edge of a concave groove 41 described later and a portion formed at an inner edge of an inner electrode cable attachment hole 38 described later.

Thus, the wiring pattern was formed at the inner edge of the lead wire mounting hole 37, at the inner edge of the inner electrode cable mounting hole 38, and at the inner edge of the outer electrode cable mounting hole 39. Part and cable mounting hole 40
And a portion formed at the edge of the concave groove 41 are connected in accordance with a predetermined pattern.

As shown in FIG. 3 and the like, the printed wiring board 24 includes a rectangular insertion portion 35 having a rectangular planar shape and an exposed portion 36 having a rectangular planar shape. The in-hole insertion portion 35 is formed such that the width H1 along the width direction is smaller than the inner diameter D1 (shown in FIG. 1) of the temperature detection portion insertion hole 2d. The longitudinal direction of the in-hole insertion section 35 extends along the longitudinal direction of the temperature detection section insertion hole 2d.
Inserted in d.

The outside exposure portion 36 is connected to the inside insertion portion 35. The outer exposed portion 36 is formed such that the width H2 along the width direction of the inner insertion portion 35 is larger than the inner diameter D1 of the temperature detection portion insertion hole 2d. For this reason, the outside exposed portion 36
When the insertion part 35 in a hole is inserted into the insertion hole 2d of the temperature detection part, it is exposed in the space 16 without entering into the insertion hole 2d of the temperature detection part. Thus, the width H2 of the exposed portion 36 outside the hole is larger than the width H1 of the insertion portion 35 inside the hole.

A plurality of lead wire mounting holes 37 are provided at an end 35a of the in-hole insertion portion 35 remote from the outside exposure portion 36. The end 35a forms a portion to which the lead wire 23 of the printed wiring board 24 described in this specification is connected. The lead wire mounting hole 37 penetrates the insertion portion 35 in the hole, that is, the printed wiring board 24. The wiring pattern is provided on the inner edge of the lead wire mounting hole 37. The other ends of the lead wires 23 are attached to these lead wire attachment holes 37.

The other end of the lead wire 23 is passed through the lead wire attachment hole 37 and is fixed to the lead wire attachment hole 37 by brazing using solder or the like. Thus,
The lead wire 23 is electrically connected to a part of a wiring pattern formed on the inner edge of the lead wire mounting hole 37.

The outer exposed portion 36 has a pair of concave grooves 41,
Inner electrode cable mounting hole 38 and outer electrode cable mounting hole 3
9 and a plurality of cable mounting holes 40 are provided. The pair of concave grooves 41 are formed in the hole insertion portion 3 of the hole outside exposure portion 36.
It is provided at the end 36a closer to the fifth. The concave groove 41 is provided outside the hole insertion portion 35 along the width direction of the hole insertion portion 35. The pair of concave grooves 41 are formed in
That is, they are provided at intervals from one another along the width direction of the printed wiring board 24.

The concave groove 41 is formed in a belt shape and penetrates the exposed portion 36 outside the hole, that is, the printed wiring board 24. Groove 41
Extends from the end portion 36a toward an end portion 36b of the outer exposed portion 36 which is separated from the insertion portion 35 in the hole. The concave grooves 41 are provided at intervals along the width direction of the in-hole insertion portion 35, that is, the printed wiring board 24. Groove 4
Numerals 1 are provided at positions interposing the in-hole insertion portion 35 therebetween. The edge of the tubular spring member 25 that passes through the in-hole insertion portion 35 can be fitted into the concave groove 41.

The inner electrode cable mounting hole 38 and the outer electrode cable mounting hole 39 are provided at the center of the outer hole exposed portion 36 along the longitudinal direction of the inner insertion portion 35. The inner electrode cable mounting hole 38 and the outer electrode cable mounting hole 39 are juxtaposed along the width direction of the insertion portion 35 in the hole, that is, the printed wiring board 24. The inner electrode cable mounting hole 38 and the outer electrode cable mounting hole 39 respectively penetrate the hole exposed portion 36, that is, the printed wiring board 24. The wiring pattern is provided at the inner edge of each of the inner electrode cable mounting hole 38 and the outer electrode cable mounting hole 39. One end of the inner electrode cable 6 is attached to the inner electrode cable attachment hole 38,
One end of the external electrode cable 7 is attached to the external electrode cable attachment hole 39.

The core wire located at one end of the inner electrode cable 6 is passed through the inner electrode cable mounting hole 38 and is fixed to the inner electrode cable mounting hole 38 by brazing using solder or the like. Thus, the inner electrode cable 6 is electrically connected to a part of the wiring pattern formed on the inner edge of the inner electrode cable mounting hole 38.

The core wire located at one end of the outer electrode cable 7 is passed through the outer electrode cable mounting hole 39 and is fixed to the outer electrode cable mounting hole 39 by brazing using solder or the like. Thus, the outer electrode cable 7 is electrically connected to a part of the wiring pattern formed on the inner edge of the outer electrode cable mounting hole 39.

The plurality of cable mounting holes 40 are arranged in parallel with the end 36b of the exposed portion 36 along the width direction of the insertion portion 35 in the hole, that is, the printed wiring board 24. Each of the plurality of cable attachment holes 40 penetrates the exposed portion 36 outside the hole, that is, the printed wiring board 24. The wiring pattern is provided on the inner edge of each of the plurality of cable mounting holes 40. One end of the cable 27 and one end of the shield wire 28 are attached to the plurality of cable attachment holes 40, respectively.

The core wire located at one end of the cable 27 and the shield wire 28 is passed through a cable mounting hole 40, and is brazed using solder or the like.
Fixed to 0. Thus, the cable 27 and the shield wire 28 are electrically connected to a part of the wiring pattern formed on the inner edge of the cable attachment hole 40.

The inner electrode cable 6, the plurality of cables 27, and the shield wire 28 are bundled with each other by an insulating tube 26a having an insulating property and connected to the electric wire cable 26. The electric wire cable 26 is guided to the outside and is electrically connected to an arithmetic unit (not shown).

The tubular spring member 25 is made of a known conductive steel, stainless steel, brass, phosphor bronze, or the like. The tubular spring member 25 is formed in a tubular shape as shown in FIGS. 4 and 5C. Pipe spring member 25
Has a notch 42 as shown in FIG.

The notch 42 is formed as shown in FIG.
A part of the base material of the tubular spring member 25 is cut and formed. The notch 42 is formed along the longitudinal direction of the tubular spring member 25. As shown in FIG. 5A, the notch 42 is formed in a zigzag shape from one end of the annular spring member 25 to the other end.

That is, the notch 42 is formed in a wave shape when viewed from the outer peripheral direction of the tubular spring member 25. For this reason, as shown in FIG. 5B, the cross-sectional shape of the cross-section that intersects the longitudinal direction of the tubular spring member 25 is formed in a C shape.

The tubular spring member 25 is provided with the edges 45a, 45b of the base material sandwiching the notch 42 and facing each other.
Are elastically deformable so that the distance h between them can be increased or decreased. That is, the circular tube spring member 25 is elastically deformable so that its outer diameter Da and inner diameter Db can expand and contract.

In the initial state in which the tubular spring member 25 is not elastically deformed, the outer diameter Da is larger than the inner diameter of the small diameter portion 2a of the inner electrode 2, that is, the inner diameter D1 of the temperature detecting portion insertion hole 2d. In the initial state in which the tubular spring member 25 is not elastically deformed, the inner diameter Db of the tubular spring member 25 is equal to the pair of concave grooves 41.
Greater than the spacing D2 (shown in FIG. 3)

The tubular spring member 25 has an inner insertion portion 3 inside.
Through 5, the diameter is reduced against the elastic restoring force, and the edge near the exposed portion 36 fits into the groove 41. Then
The tubular spring member 25 generates an elastic restoring force and comes into contact with a part of the wiring pattern formed on the edge of the concave groove 41. The tubular spring member 25 is fixed to the edge of the concave groove 41 by brazing using solder 46 or the like. Thus, the tubular spring member 25 is electrically connected to a part of the wiring pattern formed on the edge of the concave groove 41.

The tubular spring member 25 is disposed near the temperature sensor element 21 of the electric cable 26. The circular tube spring member 25 is inserted into the small diameter portion 2a, that is, the temperature detecting portion insertion hole 2d, against its elastic restoring force.

When inserted into the small-diameter portion 2a, the tubular spring member 25 generates an elastic restoring force, and comes into close contact with the inner peripheral surface of the small-diameter portion 2a, that is, the inner peripheral surface 2h of the temperature detecting portion insertion hole 2d. I do. Thus, the tubular spring member 25 is electrically connected to the inner electrode 2 and a part of the wiring pattern formed on the inner edge of the inner electrode cable attachment hole 38 of the printed wiring board 24.

The second retaining ring 20 is made of a known steel such as stainless steel or the like, and is formed in an annular shape. The second retaining ring 20 is housed inside the space 16 through the electric wire cable 26 of the temperature detecting unit 5 inside.
The second retaining ring 20 is stopped on the base end side of the inner electrode holder 10. The outer edge of the second retaining ring 20 is fitted to the inner peripheral surface 11d of the outer electrode holder 11, and is fixed to the outer electrode holder 11 or the like.

Each of the inner electrode cable 6, the outer electrode cable 7, and the plurality of cables 27 is formed to have a diameter larger than that of the lead wire 23, and includes a conductor made of a conductor, and an insulating portion covering the core. It is a so-called covered electric wire. The shield wire 28 is formed only of a core wire made of a conductor.

The inner electrode cable 6 transmits the electric signal of the electrolyte solution to the inner electrode 2, the circular tube spring member 25, the solder in the concave groove 41 of the printed wiring board 24, the wiring pattern of the printed wiring board 24, and the printed circuit. The solder is supplied to a mounting device (not shown) outside the outer electrode holder 11 via the solder in the mounting hole 38 of the wiring board 24 in order.

The external electrode cable 7 transmits the electric signal of the electrolyte solution to the external electrode 3, the external electrode holder 11, the second
Of the retaining ring 20, the second retaining ring 20, the external electrode cable 7, the solder of the mounting hole 39 of the printed wiring board 24, the wiring pattern of the printed wiring board 24, and the solder of the mounting hole 40 of the printed wiring board 24. , Via a shield wire 28 in order, to an arithmetic unit (not shown) outside the outer electrode holder 11.

The remaining plurality of cables 27 transmit the temperature electric signal according to the above-described configuration to the temperature sensor element 21, the lead wires 23, the solder in the mounting holes 37 of the printed wiring board 24, and the wiring pattern of the printed wiring board 24. , Through the solder of the mounting holes 40 of the printed wiring board 24, and then to an arithmetic unit (not shown) outside the outer electrode holder 11.

In the state where the lead wire 23 is attached to the lead wire attaching hole 37 of the insertion portion 35 in the hole of the printed wiring board 24, the temperature sensor element 21, the lead wire 23 and the end 3
5a is covered with a synthetic resin 47 as shown in FIG.

The temperature detecting section 5 having the above-described structure is assembled as follows. The insertion portion 35 in the hole is provided in the tubular spring member 25.
Then, the edge of the tubular spring member 25 is fitted into the concave groove 41, and the printed wiring board 24 and the tubular spring member 25 are fixed by brazing using solder 46. One end of the lead wire 23 of the temperature sensor element 21 is fixed to the lead wire mounting hole 37 of the printed wiring board 24 by brazing using solder or the like,
Cover with synthetic resin 47.

Each cable 6, 7, 27 and shield wire 2
8 is fixed to predetermined mounting holes 38, 39, 40.
The cables 6, 27 and the shielded wire 28 are bundled and passed through the insulating tube 26a to form an organized bundle, and the terminal treatment of the wire cable 26 is also performed. Thus, the temperature detector 5 is assembled.

Further, the temperature sensor element 21, the lead wire 23, and the hole insertion portion 35 of the temperature detection portion 5 are inserted into the temperature detection portion insertion hole 2d, which is previously filled with an appropriate amount of insulating resin such as epoxy resin. The space 16 is filled with an epoxy resin 31 in a state where the retaining rings 19 and 20 are housed.

The epoxy resin 31 is applied to the inner peripheral surface 11 d of the outer electrode holder 11 and the end surface 1 of the inner electrode holder 10.
0e is kept liquid-tight, and the above-mentioned electrolyte solution in the space 16 and the intrusion of moisture generated by condensation on the surface of the outer electrode holder 11 when used at a low temperature are prevented.

According to the above configuration, the electrode 1 of the resistivity meter is used.
Arranges at least the tips 2g and 3c of the inner electrode 2 and the outer electrode 3 in the flow path of the electrolyte liquid to be measured. The electrode 1 of the resistivity meter measures the electric resistance between the inner electrode cable 6 and the electrodes 2 and 3 transmitted to a computing device or the like via one of the plurality of cables 27 and the like. Is measured.

At this time, the lead wire 23 and the other cable 27 are connected from the temperature sensing portion 21a of the temperature sensor element 21.
The information corresponding to the temperature of the electrolyte solution is transmitted to the arithmetic unit via the like. Then, the arithmetic unit compensates the temperature of the electrolyte solution, and calculates the resistivity of the electrolyte solution at a predetermined constant temperature.

According to the electrode 1 of the resistivity meter of the present embodiment,
The printed wiring board 24 is connected to the lead wire 23 to which the temperature sensing part 21a of the temperature sensor element 21 is connected, and the printed wiring board 24
, The temperature detection means 5 can be assembled. Thus, when assembling the temperature detection unit 5,
There is no need to directly connect the lead wire 23 to the cables 6 and 27 and the cable 7 and the shield wire 28. Therefore, it can be easily assembled.

Further, since there is no connection point where the lead wire 23 and the cables 6 and 27 and the cable 7 and the shield wire 28 are directly connected, there is no need to cover the connection point with an insulating tube made of an insulator. The number of points can be suppressed, and the number of steps required for assembly can be suppressed. Further, since the printed wiring board 24 is rigid, the temperature sensor element 21 can be easily positioned at a predetermined position in the temperature detection unit insertion hole 2d by inserting the printed wiring board 24 into the temperature detection unit insertion hole 2d. Can be done. For this reason, it can be more easily assembled.

Therefore, the labor and time required for assembling can be reduced, and a rise in cost can be suppressed. In addition, since it is not necessary to use an insulating tube that covers a connection point where the lead wire 23 and the cables 6 and 27 and the cable 7 and the shield wire 28 are directly connected, it is not necessary to use an insulating tube.
There is no gap between the cable 27, the cable 7, the shield wire 28, and the inner surface of the insulating tube. Therefore, it is possible to prevent an extra gap or the like from being generated in the temperature detection unit insertion hole 2d, and it is possible to reliably prevent an electrolyte solution or the like from entering the temperature detection unit insertion hole 2d.

Further, the cable 27 having a relatively large diameter is connected to the exposed portion 36 having a larger width than the insertion portion 35 in the hole.
As described above, the second electric wire having a diameter larger than that of the lead wire 23 is connected to the exposed portion 36 having a relatively large width. Therefore, the cable 27 and the shield wire 28 can be easily connected to the printed wiring board 24. Therefore, the temperature detection unit 5 can be more easily assembled, and the labor and time required for assembling the electrode 1 of the resistivity meter can be suppressed, and a rise in cost can be suppressed.

The synthetic resin 47 is connected to the temperature sensor element 21, the lead wire 23, and the printed wiring board 24 to which the lead wire 23 is connected.
End 35a. It is not necessary to cover the connection location between the temperature sensor element 21, the lead wire 23, and the end 35a of the printed wiring board 24 with an insulating tube.

Therefore, the number of parts and the number of steps required for assembling can be suppressed, and no extra gap is formed in the temperature detecting portion insertion hole 2d. Therefore, the labor and time required for assembling the electrode 1 of the resistivity meter can be suppressed, so that a rise in cost can be suppressed, and intrusion of the electrolyte solution into the temperature detection portion insertion hole 2d can be reliably prevented.

The circular tube spring member 2 is inserted into the temperature detecting portion insertion hole 2d.
When the plug 5 is inserted, the tubular spring member 25 is electrically connected to the inner electrode 2. Therefore, it is not necessary to directly connect an electric wire or the like to the inner electrode 2 or the like in order to extract information based on the resistivity of the electrolyte solution from the inner electrode 2.

Therefore, it is possible to easily assemble, and to reduce the labor and time required for assembling.
High cost can be suppressed. Further, since it is not necessary to directly connect an electric wire or the like to the inner electrode 2 or the like, it is not necessary to use an insulating tube or the like to cover the connection portion. For this reason, it is possible to reliably prevent the electrolyte solution from entering the temperature detection unit insertion hole 2d, and to suppress an increase in the number of parts.

The edge of the tubular spring member 25 is connected to the printed wiring board 24.
When the circular tube spring member 25 is inserted into the temperature detecting portion insertion hole 2d, the inner electrode 2 and the inner electrode lead wire 6 are electrically connected. For this reason. In order to extract information based on the resistivity of the electrolyte solution from the inner electrode 2, it is not necessary to directly connect wires or the like to the inner electrode 2 or the like, and it is not necessary to connect wires.

Therefore, it is possible to easily assemble, and to reduce the labor and time required for assembling.
Higher costs can be further suppressed. Further, it is not necessary to directly connect an electric wire or the like to the inner electrode 2 or the like, and
Since there is no need to connect the wires, there is no need to use an insulating tube or the like to cover these connection points. For this reason, the intrusion of the electrolyte solution into the temperature detection section insertion hole 2d can be reliably prevented, and an increase in the number of parts can be suppressed.

The outer diameter Da of the cylindrical spring member 25 in the initial state where it is not elastically deformed is equal to the inner diameter D1 of the temperature detecting portion insertion hole 2d.
Further, the inner diameter Db in the initial state is larger than the distance D2 between the pair of concave grooves 41. Therefore, when the edge of the tubular spring member 25 is fitted into the concave groove 41, the tubular spring member 25 and a part of the wiring pattern located at the edge of the concave groove 41 are reliably electrically connected. .

When the tubular spring member 25 is inserted into the temperature detecting portion insertion hole 2d, the tubular spring member 25 is securely brought into contact with the inner peripheral surface 2h of the temperature detecting portion insertion hole 2a, and the inner electrode 2 is securely connected electrically. Therefore, assembling can be performed more easily, labor and time required for assembling can be further suppressed, and a rise in cost can be further suppressed.

In the above-described embodiment, after the tubular spring member 25 is fitted in the concave groove 41, the printed wiring board 24 and the tubular spring member 25 are fixed by brazing using solder or the like. However, in the present invention, the tubular spring member 25 may be fitted into the concave groove 41 to electrically connect the wiring pattern of the printed wiring board 24 and the tubular spring member 25,
The wiring pattern of the printed wiring board 24 and the tubular spring member 25 may be electrically connected by brazing using solder or the like. Further, the electrode 1 of the present invention can of course be used for a conductivity meter for measuring the conductivity of the electrolyte solution.

[0117]

As described above, according to the first aspect of the present invention, a temperature detecting element is connected to a printed wiring board by connecting a wire to which a temperature sensor element is connected, and a second wire is connected to the printed wiring board. The means can be assembled. Thus, when assembling the temperature detecting unit, it is not necessary to connect the electric wires. Therefore, it can be easily assembled.

Further, since it is not necessary to cover a connection portion or the like where the electric wires are connected with an insulating tube or the like made of an insulator, the number of components can be reduced, and the number of steps required for assembly can be reduced. Furthermore, since the printed wiring board is hard, the temperature sensor element can be easily positioned at a predetermined position in the hole by inserting the printed wiring board into the hole. For this reason, it can be more easily assembled.

Therefore, the labor and time required for assembling can be reduced, and a rise in cost can be suppressed. Further, since it is not necessary to cover the connection points between the electric wires with the insulating tube or the like, a gap between the electric wire and the inner surface of the insulating tube or a gap between the second electric wire and the inner surface of the insulating tube is formed in the hole. Does not occur. Therefore, it is possible to prevent an extra gap or the like from being generated in the hole, and it is possible to reliably prevent the electrolyte solution or the like from entering the hole.

According to the present invention, the second electric wire having a relatively large diameter is connected to the exposed portion having a relatively large width.
Therefore, the second electric wire can be easily connected to the printed wiring board.
Therefore, the temperature detecting section can be more easily assembled, and the labor and time required for assembling the electrodes of the resistivity meter can be suppressed, and a rise in cost can be suppressed.

The present invention according to claim 3 is characterized in that the synthetic resin comprises
Since the temperature sensor element, the electric wire, and the portion of the printed wiring board to which the electric wire is connected are covered, there is no need to insert these connection portions into an insulating tube made of an insulator.
For this reason, the number of parts and the number of steps required for assembling can be suppressed, and no extra gap is formed in the hole. Therefore,
The time and effort required for assembling the electrodes of the resistivity meter can be suppressed, and the cost can be prevented from rising. Liquid intrusion can be reliably prevented.

According to the fourth aspect of the present invention, when a connecting member is inserted into the hole, the connecting member is electrically connected to one electrode member having the hole. Therefore, it is not necessary to directly connect an electric wire or the like to the one electrode member or the like in order to extract information based on the resistivity of the electrolyte solution from the one electrode member.

Therefore, it is possible to easily assemble, and to reduce the labor and time required for assembling.
High cost can be suppressed. Further, since it is not necessary to directly connect an electric wire or the like to the one electrode member or the like, there is no need to use an insulating tube or the like to cover the connection portion. Therefore, intrusion of the electrolyte solution into the holes can be reliably prevented, and increase in the number of parts can be suppressed.

According to a fifth aspect of the present invention, when the connecting member is inserted into the hole and the edge of the connecting member is fitted into the concave groove of the printed wiring board, one electrode member having the hole is provided. And the second electric wire are electrically connected. For this reason. In order to extract information based on the resistivity of the electrolyte solution from the one electrode member, it is not necessary to directly connect wires or the like to the one electrode member or the like, and it is not necessary to connect wires.

Therefore, it is possible to easily assemble, and to reduce the labor and time required for assembling.
High cost can be suppressed. Further, since it is not necessary to directly connect an electric wire or the like to the one electrode member or the like, and it is not necessary to connect the electric wires to each other, it is not necessary to use an insulating tube or the like to cover these connection portions. Therefore, intrusion of the electrolyte solution into the holes can be reliably prevented, and increase in the number of parts can be suppressed.

According to the present invention, the outer diameter of the connecting member in the initial state is larger than the inner diameter of the hole and larger than the interval between the pair of concave grooves. Therefore, when the connecting member is inserted into the hole, the connecting member surely comes into contact with the inner peripheral surface of the hole, and is reliably electrically connected to one electrode member provided with the hole. Therefore, it is possible to easily assemble, further reducing the labor and time required for assembling,
Higher costs can be further suppressed.

Further, when the connecting member is fitted into the concave groove, the connecting member surely comes into contact with the edge of the concave groove. For this reason, when the connection member is fitted into the concave groove, the wiring pattern of the printed wiring board and the connection member are reliably electrically connected. Therefore, it is possible to easily assemble, and it is possible to further reduce the labor and time required for assembling, thereby further suppressing a rise in cost.

In the drawings and description, the outer diameter of the connecting member and the outer edge of the concave groove are described. However, the connection is performed between the inner diameter of the connecting member and the inner edge of the concave groove. Needless to say, the electrical signal may be more reliably taken out by attaching or the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of an electrode of a resistivity meter according to an embodiment of the present invention.

FIG. 2 is a side view showing a configuration of a temperature detecting section of the electrode of the embodiment.

FIG. 3 is a plan view showing a printed wiring board of electrodes of the embodiment.

FIG. 4 is a perspective view showing a tubular spring member of the electrode according to the embodiment.

FIG. 5A is a plan view showing the tubular spring member shown in FIG. 4; FIG. 5B is a sectional view taken along line VB-VB in FIG. FIG. 5C is a cross-sectional view along the line VC-VC in FIG.

FIG. 6 is a cross-sectional view showing the vicinity of a temperature sensor element of a temperature detecting section of the electrode according to the same embodiment.

FIG. 7 is a cross-sectional view showing an overall configuration of an electrode of a conventional resistivity meter.

FIG. 8 is a side view showing an example of a temperature detector used for the electrode shown in FIG.

FIG. 9 is a cross-sectional view showing the vicinity of a temperature sensor element of the temperature detecting section shown in FIG.

FIG. 10 is a cross-sectional view showing a connection point between a thermistor lead wire and a cable of the temperature detection unit shown in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode of resistivity meter 2 Inner electrode (electrode member) 2d Insertion hole (hole) of temperature detection part 2f Base end 2g Tip part 2h Inner peripheral surface 3 Outer electrode (electrode member) 5 Temperature detector 6 Inner electrode cable (No. 2 electric wire) 21 temperature sensor element 22 temperature sensor element 23 lead wire (electric wire) 24 printed wiring board 25 circular spring member (connection member) 27 cable (second electric wire) 28 shield wire (second electric wire) 35 insertion part in hole 35a End (location of printed wiring board) 36 Outer hole exposed portion 41 Groove 47 Synthetic resin t Predetermined interval D1 Inner diameter of temperature detecting portion insertion hole D2 Distance between concave grooves Da Outer diameter of tubular spring member Db Pipe spring Inside diameter of member

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F056 CL06 WF03 WF08 2G028 AA02 AA04 BC04 CG02 GL01 HM05 HN03 HN09 2G060 AA06 AC02 AE17 AF07 AG11 KA06

Claims (6)

[Claims] 1. A resistivity meter according to claim 1, wherein a plurality of electrode members are arranged at predetermined intervals in a flow path of the electrolyte solution to be measured, and the resistivity of the electrolyte solution is measured based on electric resistance between the electrode members. In the electrode, at least one of the electrode members is formed in a columnar shape and has a hole extending from a base end to a tip end, and is inserted into the hole and takes out information corresponding to the temperature of the electrolyte solution. A temperature sensor element for detecting information corresponding to the temperature of the electrolyte solution, an electric wire having one end connected to the temperature sensor element, and the other end of the electric wire being connected to the temperature sensor. A rigid printed wiring board, and a second electric wire having one end connected to the printed wiring board. Toward the end In location state, the electrode resistivity meter, characterized in that at least the temperature sensor element is inserted into the hole. 2. The second electric wire has a larger diameter than the electric wire, and the printed wiring board has an insertion portion inserted into the hole, an exposed portion exposed outside the hole, The width of the insertion portion in the hole is smaller than the inner diameter of the hole, and the width of the exposed portion outside the hole is larger than the inner diameter of the hole,
The electrode of a resistivity meter according to claim 1, wherein the second electric wire is connected to the exposed portion outside the hole. 3. The printed circuit board according to claim 1, wherein the temperature sensor element, the electric wire, and a portion of the printed wiring board to which the electric wire is connected are covered with a synthetic resin. Electrode of resistivity meter. 4. The temperature detecting section is formed in a tubular shape, is capable of inserting the printed wiring board inside, and when inserted into the hole, contacts the inner peripheral surface of the hole to form the one electrode. The electrode of the resistivity meter according to claim 2, further comprising a connection member electrically connected to the member. 5. The printed wiring board is provided with a concave groove on the outside of the hole, into which the edge of the connecting member having the hole insertion part inserted is fitted, and a wiring pattern is formed on an edge of the concave groove. 5. The resistivity meter according to claim 4, wherein, when the edge is fitted into the concave groove, the connection member is electrically connected to a wiring pattern of the printed wiring board. electrode. 6. A pair of said recessed grooves are provided at a distance from each other along a width direction of said printed wiring board, and said connecting member is elastically deformable so that an outer diameter can be expanded and contracted. The electrode of a resistivity meter according to claim 5, wherein an outer diameter in an initial state is larger than an inner diameter of the hole, and an inner diameter is larger than an interval between the pair of concave grooves.