KR100659462B1 - Liquid Leakage Detector - Google Patents

Abstract

assignment

In the case where the sensor portion is provided on the sensor mounting surface, attachment brackets or attachment holes are required, and process water is applied to the attachment.

Resolution

In the case where the attachment hole G is provided in the sensor portion A, and the sensor portion A is installed in the sensor installation surface 30, the stud bolt 31 provided in the sensor installation surface 30 is a hole for attachment. It penetrates into (G), screwing the nut member 32 to the stud bolt 31, and fastening this nut member 32 are performed.

Leak

Description

Liquid Leakage Detector

1 is an explanatory diagram of a configuration of Embodiment 1 of a leaky liquid detector according to the present invention;

2 is a front view of a sensor unit in the leaked liquid detector;

3 is a rear view of the sensor unit;

4 is a cross-sectional view of the sensor unit.

5 is a partially omitted cross-sectional view taken along the line X-X of FIG.

6 is a partially omitted cross-sectional view taken along the line Y-Y of FIG.

FIG. 7 is an explanatory diagram of a state before installing a sensor unit on a sensor mounting surface in Embodiment 1 of a leaky liquid detector according to the present invention; FIG.

8 is an explanatory view of a state in which the sensor unit is installed on a sensor installation surface from the front;

Fig. 9 is an explanatory view of a state in which the sensor unit is installed on a sensor installation surface in plan view;

Fig. 10 is a longitudinal sectional view of the sensor unit in the second embodiment of the leak detector according to the present invention.

11 is an explanatory diagram of a state before installing the sensor unit on a sensor installation surface;

12 is an explanatory view of a state in which the sensor unit is installed on a sensor installation surface from the front;

Fig. 13 is an explanatory view of a state in which the sensor portion is installed on a sensor installation surface in plan view;

14 is a longitudinal cross-sectional view of a sensor unit according to Embodiment 3 of a leaky liquid detector according to the present invention;

15 is an explanatory diagram of a state before installing the sensor unit on a sensor installation surface;

Fig. 16 is an explanatory view of a state in which the sensor unit is installed on a sensor installation surface;

Fig. 17 is an explanatory view in plan view of a state in which the sensor unit is installed on a sensor installation surface;

18 is an explanatory diagram when a plurality of sensor units are connected in parallel to the apparatus main body in the leak detector according to the present invention;

Fig. 19 is an explanatory diagram when a sensor part and a sheet-shaped sensor part are connected in parallel with the apparatus main body in the leak detector according to the present invention.

20 is a perspective view of a sensor unit in a conventional liquid leak detector.

Explanation of symbols for the main parts of the drawings

A: sensor part B: device body (amplifier part)

C: Wiring cable E: Leakage

F: Leakage detector G: Mounting hole

K: body 1: case

2: cover 3: base

4A: electrode 4B: electrode

5 hole 8 leg portion

10: hole 11: insertion hole for cable

13 guide part 14 through-hole part

15A, 15B, 15C, 15D: electrode insertion hole 17: electrode part

18: connection part 19: connection part

30: sensor mounting surface 31: stud bolt (sensor mounting member)

32: nut member (sensor attachment member) 33: gap

Technical field

TECHNICAL FIELD The present invention relates to a leaky liquid detector that detects a liquid, for example, a liquid leak such as water, a chemical liquid, condensation, and the like.

Background technology

As a leaky liquid detector which detects leakage by the inter-electrode resistance detection method, a leaky liquid detector having the sensor unit 40 shown in FIG. 20, a leaky liquid detection zone which detects the area of the leaked liquid, and an inspection and extraction of the leaked liquid ( And a leaky liquid detector for performing dot discharge.

The sensor part 40 in the leak detection detector shown in FIG. 20 is one electrode 42 which consists of a skew-shaped conductive pattern on the back surface of the hard board | substrate 41 in plate shape, and skewers The other electrode 43 which consists of a conductive pattern of a shape is mutually interlocked with the clearance gap, and is comprised.

If the leakage leakage detection signal for transmission is sent from the signal transmission circuit of the apparatus main body (amplifier section) (not shown) to one electrode 42, and leakage leakage 44 does not occur, the leakage leakage detection signal for transmission is blocked. It is in a state, and between one electrode and the other electrode becomes an open loop.

When the leakage liquid 44 is generated and the one electrode 42 and the other electrode 43 are short-circuited by the leakage liquid 44, the detection leakage liquid detection signal is detected via the leakage liquid 44 on the other electrode. It flows to 43 and is input into an apparatus main body (amplifier part). Since the voltage of the input leakage detection output signal changes with the resistivity of the leakage 44, the leakage detection output signal is compared with the detection level set in the setting section in the comparison section, and as a result of this comparison, In the case of " 44 ", the display portion lights up, and the leakage liquid output portion turns on or off.

Moreover, as a sensor part in the conventional leak liquid detector, there exists a leak liquid detector which can adjust a detection level by using an electrode for a detection part, and adjusting the height of this electrode. An almost T-shaped groove is formed on the bottom of the support in the leak detector, and an electrode, which is a metal piece, is provided with the intersection of the groove. The leak detector is provided with the surface exposed by the electrode facing downward. When the level of immersion by the leak solution reaches the position of the electrode, the conductivity between the electrodes is conducted to a certain resistance by the conductivity of water or the like. This change in insulation / conduction is output to the detection circuit as a leakage signal.

Moreover, the four holes of the bottom face of a support body are provided with the screw hole for height adjustment, and two mounting screw holes are provided in the substantially center part. The gap between the mounting surface of the leaky liquid detector and the electrode is arbitrarily adjusted by the height adjusting screw screwed into the screw hole, and the leaky liquid detector is attached to the bottom of the vending machine by a screw member passing through the screw hole. (See patent document 1).

[Patent Document 1]

Publication No. 2-75540

However, in the above-mentioned conventional electron leakage detector, since the board | substrate 41 which comprises the sensor part 40 is a sheet form, the installation place is limited and the sensor part 40 is provided in the sensor installation surface. In this case, there is a problem in that an attachment bracket or an attachment tool is required, and a process water is applied to the attachment.

Moreover, in the above-mentioned conventional leak-tight detector, it attaches to the bottom of a vending machine by the screw member which penetrates the screw hole provided in the support body, and there exists a problem that process water is added to attachment.

In addition, some conventional liquid leak detectors have a photoelectric type that detects leakage by irradiating light with liquid leakage. However, even when the liquid leak detector is installed on a sensor mounting surface, a mounting bracket is required and a process water is applied to the adhesion. have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to eliminate the need for mounting brackets in the case of installing the sensor unit on the sensor mounting surface, and to reduce the number of steps for attaching the sensor. A liquid leakage detector capable of detecting leakage of leakage on a surface is provided.

In order to achieve the above object, a leaky liquid detector according to the present invention is based on a leaky liquid detection output signal which is output by short-circuit between the one and the other electrodes provided in the sensor portion provided on the sensor mounting surface. A leaky liquid detector for detecting a sensor, wherein the sensor portion is provided with an attachment hole for attaching a sensor attachment member provided on the sensor mounting surface at the time of installation on the sensor mounting surface, and one electrode and the other electrode are sensors of the sensor portion. It is displayed on the mounting surface side, and it detects the leakage which leaked on the sensor mounting surface, It is characterized by the above-mentioned.

By such a structure, when attaching a sensor part to a sensor installation surface, it can carry out by inserting the sensor attachment member provided in the sensor installation surface into the attachment hole provided in the sensor part. As a result, the mounting bracket becomes unnecessary, and the number of attachment steps can be reduced, and since the electrodes on one side and the other side are exposed on the sensor mounting surface side of the sensor unit, the leakage of leaked liquid on the sensor mounting surface can be reliably prevented. Detection can be performed.

Moreover, the liquid leak detector which concerns on this invention is the liquid leak detector which concerns on said invention WHEREIN: The sensor part has a body, and the attachment hole penetrated from the sensor installation surface side over the opposing surface which opposes this sensor installation surface side. It is characterized in that it is provided in the body.

In the case where the sensor portion is provided on the sensor mounting surface by such a configuration, it can be performed by passing the sensor attachment member provided on the sensor mounting surface through the attachment hole provided in the sensor portion. For this reason, the mounting bracket becomes unnecessary, and the number of attachment processes can be reduced.

In the leak detector according to the present invention, the leak detector according to the present invention includes a sensor attachment member comprising a stud bolt and a nut member screwed to the stud bolt, and the stud bolt is attached to the attachment hole. The nut member is screwed into the stud bolt through the insertion, and the nut member is fastened so that the sensor portion is provided on the sensor mounting surface.

With such a structure, when attaching a sensor part to a sensor installation surface, it can carry out by inserting a stud bolt through the attachment hole provided in the sensor part, screwing a nut member to a stud bolt, and fastening this nut member. For this reason, the mounting bracket becomes unnecessary, and the number of attachment processes can be reduced.

In the leak detector according to the present invention, in the leak detector according to the present invention, the sensor attachment member is a stud bolt, the female thread portion is added to the attachment hole, and the stud bolt is screwed into the attachment hole, so that the sensor portion is It is characterized in that the installation on the installation surface.

According to such a structure, when attaching a sensor part to a sensor installation surface, it can carry out by screwing a stud bolt to the attachment hole provided in the sensor part. For this reason, the mounting bracket becomes unnecessary, and the number of attachment processes can be reduced.

In the leak detector according to the present invention, the leak detector according to the present invention is characterized in that the sensor portion has a body, the mounting hole is opened on the sensor installation surface side, and the opposing surface facing the sensor installation surface side is closed. It is provided in the body in a state, and it is provided so that a sensor part may be installed in a sensor installation surface by adding a female screw part to a mounting hole, and screwing a stud bolt to a mounting hole.

With this arrangement, when the sensor portion is mounted on the sensor mounting surface, it can be carried out by screwing the stud bolt into the mounting hole provided in the sensor portion, which makes the mounting bracket unnecessary and reduces the number of attachment steps. Can be. In particular, the stud bolt does not protrude above the sensor portion.

Moreover, the leaktight detector which concerns on this invention WHEREIN: The leaktight detector which concerns on this invention WHEREIN: The one and the other electrode are provided in the edge part of an electrode part, and the connection part which stood up with respect to this electrode part is comprised, and is comprised. The sensor part has a body, an electrode insertion hole is formed in the sensor installation surface side of the body, a wiring cable is inserted in the body, and the connection parts of one and the other electrode are inserted into the electrode insertion hole. The electrode part is exposed to the sensor installation surface, the one end and the other wire of the wiring cable is connected to the connection part, and the connection part and the one and the other wire are fixed to the body by solidification of the resin filled in the body. It is characterized in that the electrode portion is kept in an exposed state.

With such a configuration, since one electrode and the other electrode or the electrode portion are exposed to the sensor mounting surface side of the sensor portion, the leaked liquid leaked to the sensor mounting surface can be reliably detected.

Moreover, the leaktight detector which concerns on this invention is characterized in that the electrode part is covered with the film of electroconductive fluorine resin in said leaktight detector which concerns on this invention.

Such a structure can improve chemical resistance and can reliably detect leaks such as chemical liquids.

In the leak detector according to the present invention, the leak detector according to the present invention is configured to send a leak detection signal for sending out from a signal sending circuit to a sensor section and a sensor section, and an output signal for leak detection detected by the sensor section. Is compared with a detection level, and the apparatus main body outputs the result of the comparison, and the plurality of sensor units are connected to the apparatus main body in parallel through a wiring cable to detect leakage at a plurality of locations. It is done.

With this configuration, it is possible to connect a plurality of sensor units to one apparatus main body (for example, an amplifier), eliminating the need to connect the apparatus main body to each sensor unit, and achieve cost reduction.

In the leakage detector according to the present invention, the leakage detector according to the present invention transmits a leakage leakage detection signal for sending out from a signal sending circuit to a sensor unit and a sensor unit, and further outputs an leakage detection output signal outputted from the sensor unit. A device body is provided which compares with a detection level and outputs the result of this comparison, and leak detection is performed by connecting a sensor part and a sheet-shaped sensor part to a device body in parallel through a wiring cable.

Such a configuration makes it possible to connect the sensor unit and the sheet-shaped sensor unit to one apparatus main body (for example, an amplifier), eliminating the need to connect the apparatus main body to each sensor unit, and reduce costs. Can be.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing.

Embodiment 1

Embodiment 1 of this invention is shown in FIGS. BRIEF DESCRIPTION OF THE DRAWINGS The structural explanatory drawing of Embodiment 1 of the leakage liquid detector which concerns on this invention, FIG. 2 is the front view of the sensor part in the said liquid leak detector, FIG. 3 is the back view of the said sensor part, FIG. FIG. 5 is a partially omitted cross-sectional view taken along the line XX of FIG. 3, and FIG. 6 is a partially omitted cross-sectional view taken along the line YY of FIG. 4.

The leak detector F according to the present invention is constituted by a sensor part A which performs leak detection and an apparatus main body (amplifier part) B. FIG.

This apparatus main body (amplifier part) B is provided with a signal sending circuit, a level setting part, a comparator part, a leakage output part, and a display part (not shown in figure), and is connected to the sensor part A from a signal sending circuit to a wiring cable. The liquid leakage detection signal for transmission is sent out through (C), and the leakage detection output signal (voltage changed by the resistivity of the leakage) outputted by the sensor unit A from the comparison unit is set to the detection level set in the level setting unit. As a result of the comparison, when it is determined that the leakage is determined, the display unit (not shown) is turned on, and the leakage output unit (not shown) is turned on or off.

And the sensor part A which performs leak leakage detection is the body K which consists of a case 1, the cover 2, and the base 3, as shown in FIG. 2, FIG. 3, and FIG. Four electrodes 4A, 4B.

As shown in FIG. 6, the case 1 is provided with the case main body 1A formed by forming the circumferential wall part 1b in the circumference | surroundings of the circular bottom part 1a, and this case In the bottom portion 1a of the main body 1A, a circular hole 5 is formed in the center portion thereof. In addition, a plurality of positioning pins 7 are provided on the bottom portion 1a of the case main body 1A. In addition, four leg portions 8 protrude from the lower portion of the circumferential wall portion 1b at predetermined intervals in the circumferential direction, and engagement recesses 9 are formed on the outer circumference of the upper portion of the circumferential wall portion 1b. ) Is formed.

As shown in FIG. 6, the cover 2 is formed by forming a circumferential wall portion 2B in the periphery of the circular cover body 2A, and the cover body 2A has a circular shape in the center thereof. The hole 10 is further provided with a cable insertion hole 11 at a portion away from the hole 10, and the inner peripheral portion of the lower portion of the main wall portion 2B is engaged in the circumferential direction. The protrusion part 12 protrudes.

In addition, as shown in FIG. 6, the base 3 includes a circular base body 3A, and a hollow cylindrical guide portion 13 is formed at the center of the base body 3A. The inside of this guide part 13 is a through-hole part 14. In addition, as shown in FIG. 3, the base main body 3A is provided with electrode insertion holes 15A, 15B, and 15C and 15D in both lateral directions in which the guide portion 13 is fitted. A plurality of positioning recesses 16 are formed in the lower surface of the base body 3A.

In addition, as shown in FIG. 5, the electrodes 4A and 4B are the electrode portions 17 and the connecting portions 18 standing upright at right angles to the electrode portions 17 at both ends of the electrode portions 17. , 19) has an inverted c-shape from the side view.

In the case 1, the positioning pin 7 is inserted into the positioning recessed portion 16 to accommodate the base 3, and the case 1 is covered with a cover 2. In the center of the sensor portion A, there is formed a hole 5 of the case 1, a through hole 14 in the base guide 13 of the base, and a hole 10 of the cover 2. The mounting hole G is formed.

The connecting portions 18 and 19 of the electrodes 4A and 4B are inserted into the electrode insertion holes 15A and 15B and 15C and 15D provided in the case 1, and these connecting portions 18 and 19 are It penetrates into the case 1. In the case 1, the wiring cable C is inserted from the cable insertion hole 11, and one wire 21A of the wiring cable C is connected to one electrode 4A. The other wire 21B of the wiring cable C is connected to the connecting portion 18 of the other electrode 4B. The connecting portion 19 of one electrode 4A is connected to a connection pattern (not shown) of the circuit board 23 via one zener diode 22A, and the other electrode 4B is connected. The connecting portion 19 is connected to a connection pattern (not shown) of the circuit board 23 via the other zener diode 22B.

In the case 1, a resin 24 is filled, and by the solidification of the resin 24, the connecting portions 18, 19, one of the electrodes 4A, 4B on one side and the other, and The other Zener diodes 22A and 22B, the circuit board 23, and the one and the other wires 21A and 21B are fixed, and the electrode portions of the one and the other electrodes 4A and 4B ( 17) is displayed on the sensor mounting surface side of the body K.

The wiring cable C described above is connected to the signal input and output sides of the apparatus main body (amplifier section) B. FIG.

In addition, as shown in FIG. 7, a stud bolt 31 for attaching a leaky liquid sensor is implanted into a sensor installation surface 30 such as a mechanical facility, and the stud bolt 31 includes a nut member ( 32) are screwed together, and the sensor attachment member is comprised by these.

Next, the installation to the sensor mounting surface 30 of the sensor part A in the leaky liquid sensor F comprised as mentioned above is demonstrated.

Since the attachment hole G is formed in the center part of the sensor part A, as shown in FIG. 7, the stud bolt 31 is inserted in this attachment hole G, and the sensor part A is connected to a sensor. By mounting on the mounting surface 30, screwing the nut member 32 to the stud bolt 31, and fastening this nut member 32, as shown in FIG. 8, the sensor part A is sensored. It installs in the installation surface 30. In this case, four leg portions 8 of the case 1 are in contact with the sensor mounting surface 30, and a gap 33 is formed between each leg portion 8.

Next, the operation of the leakage liquid detector F configured as described above will be described.

A liquid leakage detection signal for transmission is sent from the signal transmission circuit of the apparatus main body (amplifier section) B to one electrode 4A through a signal transmission wire that is one wire 21A of the wiring cable C. . When no leakage E has occurred, the leakage leakage detection signal for delivery is in a blocking state, and an open loop is formed between the electrodes 4A and 4B on one side and the other.

As shown in FIG. 9, leakage fluid E generate | occur | produces, this leakage fluid E invades below the sensor part A of the leakage fluid detector F from the clearance gap 33 between the leg parts 8, When the electrode portion 17 of one electrode 4A and the electrode portion 17 of the other electrode 4B are short-circuited by the leakage liquid E, the leakage leakage detection signal for delivery passes through the leakage liquid E. And flows to the other electrode 4A and is input to the main body of the device (amplifier) B through the other wire (wire for signal transmission) 21B.

Since the voltage of the leakage detection output signal as the input signal changes according to the resistivity of the leakage E, the leakage leakage detection output signal is compared with the detection level set by the setting section in the comparison section, and as a result of this comparison. In the case where it is determined that the leakage liquid E is detected, the display portion turns on, and the leakage liquid output portion turns on or off.

Moreover, it is also possible to make it excellent in chemical-resistance by coating the electrode part 17 of one and the other electrode 4A, 4B with electroconductive fluororesin (covering it with a film).

As described above, according to the first embodiment of the present invention, in the case of installing the sensor portion A on the sensor installation surface 30, the stud bolt 31 is provided in the attachment hole G provided in the sensor portion A. FIG. ), The nut member 32 is screwed into the stud bolt 31, and the nut member 32 is fastened. For this reason, the mounting bracket becomes unnecessary, and the number of attachment processes can be reduced.

Embodiment 2

Embodiment 2 of this invention is shown in FIGS. 10-13.

In Embodiment 2 of this invention, in the sensor part A, the female screw part 26 is formed in the inner surface of the hollow cylindrical guide part 13 provided in the base 3, and a female screw part is attached to the attachment hole G. FIG. (26) was added, and the other structure is the same as that of Embodiment 1 of above-mentioned this invention. Therefore, it is possible to finish without using the nut member 32 for attachment to the sensor installation surface 30 of the sensor part A. FIG.

That is, as shown in FIG. 11, by screwing the female screw part 26 of the attachment hole G of the sensor part A with the stud bolt 31, and rotating the sensor part A, it is shown in FIG. As shown in the drawing, the sensor unit A is mounted on the sensor installation surface 30. In addition, the operation | movement of the leakage liquid detector F is the same as the case of Embodiment 1 mentioned above of this invention.

As described above, according to the second embodiment of the present invention, in the case of installing the sensor portion A on the sensor installation surface 30, the stud bolt 31 is provided in the attachment hole G provided in the sensor portion A. FIG. ) By screwing. For this reason, the mounting bracket becomes unnecessary, and the number of attachment processes can be reduced.

Embodiment 3

Embodiment 3 of this invention is shown to FIG. 14 thru | or FIG.

In Embodiment 3 of this invention, in the sensor part A, the female screw part 26 is formed in the inner surface of the hollow cylindrical guide part 13 provided in the base 3, and the hole in the case 2 is carried out. The part 10 is removed, the female screw part 26 is added to the attaching hole G, and the attaching hole G is made into the bottomed hole, The other structure is Embodiment 1 mentioned above of this invention. As in the case of Therefore, it is possible to finish the installation of the sensor portion A on the sensor mounting surface 30 without using the nut member 32.

That is, as shown in FIG. 15, by screwing the female thread part 26 of the attachment hole G of the sensor part A to the stud bolt 31, and rotating the sensor part A, it is shown in FIG. As shown in the drawing, the sensor portion A is provided on the sensor installation surface 30. In this case, the short stud bolt 31 is used. Incidentally, the operation of the leak detector F is performed as in the case of Embodiment 1 described above of the present invention.

As described above, according to the third embodiment of the present invention, in the case of installing the sensor portion A on the sensor installation surface 30, the stud bolt 31 is provided in the attachment hole G provided in the sensor portion A. FIG. ) Can be carried out by screwing, thereby eliminating the need for mounting brackets and reducing the number of mounting steps. In addition, the stud bolt 31 does not protrude above the sensor portion A. FIG.

In addition, as shown in FIG. 18, these sensor part A is used using several sensor part A disclosed by Embodiment 1 (or Embodiment 2, 3 of this invention) mentioned above. Is a device which transmits a leakage leakage detection signal for transmission from the signal transmission circuit to the main body of the device (i.e., the sensor unit A) and compares the leakage leakage detection output signal output by the sensor unit with a detection level and outputs the result of the comparison. Leakage detection in a plurality of places is performed by connecting to the main body (B) in parallel through the wiring cable (C).

In this case, it becomes possible to connect the several sensor part A to one apparatus main body (for example, amplifier) B, and it is not necessary to connect the apparatus main body B to each sensor part A. FIG. Can reduce costs.

In addition, as shown in FIG. 19, the sensor part A and sheet-shaped sensor part A-1 which were disclosed in Embodiment 1 (or Embodiment 2, 3 of this invention) mentioned above are Leakage detection is performed by connecting one device main body (e.g., amplifier) B in parallel via the wiring cable C. FIG.

The sensor portion A-1 has one electrode 35 made of a skew-shaped conductive pattern and the other electrode 36 made of a skew-shaped conductive pattern on the back surface of the substrate 34. It is composed of interlocking teeth with a gap.

Industrial availability

The liquid leak detector according to the present invention has an effect that the mounting bracket is not necessary, and the number of steps of the attachment process can be reduced, and the liquid leakage can be reliably detected by the sensor mounting surface. For example, it is useful for a leaky liquid detector which detects leakage, condensation, etc., such as water and a chemical liquid, and a leaky liquid detection system using this leaky liquid detector.

According to the leak detector according to the present invention, the mounting bracket is not required, the number of steps of the attachment step can be reduced, and the leak can be reliably detected on the sensor mounting surface.

In addition, according to the leak detector according to the present invention, it is possible to connect a plurality of sensor units to one apparatus main body (for example, an amplifier), eliminating the need to connect the apparatus main body to each sensor unit, and to reduce costs. We can plan.

Claims (9)

A leaky liquid detector which detects said leaky liquid based on the leaky liquid detection output signal outputted by short-circuiting with the leaking liquid between one electrode and the other electrode provided in the sensor part provided in a sensor installation surface, The said sensor part is provided with the attachment hole for attaching the stud bolt which is a sensor attachment member provided in this sensor installation surface at the time of installation to the said sensor installation surface, The said one and the other electrode is a sensor of the said sensor part. The leaked liquid is expressed on the mounting surface side and leaked to the sensor mounting surface, The said one and the other electrode are comprised by providing the connection part which stood up with respect to this electrode part in the edge part of an electrode part, The sensor portion has a body, an electrode insertion hole is formed in the sensor installation surface side of the body, a wiring cable is inserted in the body, and the connection portion of the one and the other electrode is inserted into the electrode. A leaky liquid detector characterized by being inserted into a hole to expose the electrode portion on the sensor installation surface side. The method of claim 1, The sensor portion has a body, and the attachment hole is provided in the body in a state where it penetrates from the sensor mounting surface side to an opposite surface facing the sensor mounting surface side. The method of claim 2, The sensor attachment member is constituted by the stud bolt and a nut member screwed to the stud bolt, the stud bolt is inserted into the attachment hole to screw the nut member into the stud bolt, and the nut member. And the sensor unit is installed on the sensor installation surface by fastening the liquid leak detector. The method of claim 2, The sensor attachment member is a stud bolt, and a female screw portion is added to the attachment hole, and the stud bolt is screwed into the attachment hole so that the sensor portion is provided on the sensor installation surface. The method of claim 1, The sensor portion has a body, and the attachment hole is provided in the body in a state where the attachment hole is opened at the sensor installation surface side and an opposing surface opposite to the sensor installation surface side is closed, and a female screw portion is added to the attachment hole, And leaking the stud bolt into the attachment hole so that the sensor portion is provided on the sensor mounting surface. The method according to any one of claims 1 to 5, The electric wire of one side and the other of the said wiring cable was connected to the said connection part, and the said electrode part and the said one and the other electric wire were fixed to the said body by the solidification of the resin filled in the said body, and the said electrode part is expressed. Leakage detector, characterized in that to maintain. The method according to any one of claims 1 to 5, A leaking detector, wherein the electrode portion is covered with a film of a conductive fluororesin. The method according to any one of claims 1 to 5, And a device main body which transmits a leakage leakage detection signal for transmission from the signal transmission circuit to the sensor section, and compares the leakage leakage detection output signal outputted by the sensor section with a detection level and outputs the result of the comparison. And leak detection at a plurality of places by connecting a plurality of said sensor parts to the said apparatus main body in parallel through a wiring cable. The method according to any one of claims 1 to 5, And a device main body which transmits a leakage leakage detection signal for transmission from the signal transmission circuit to the sensor section, and compares the leakage leakage detection output signal outputted by the sensor section with a detection level and outputs the result of the comparison. And leak detection by connecting the sensor part and the sheet-shaped sensor part in parallel with the main body of the device via a wiring cable.

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