JP2000180294A - Liquid leakage sensor, thin paper therefor and holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect liquid leakage with receiving no effect from bubble generation when a large amount of liquid is leaked at one time in an optical liquid leakage sensor used with thin paper. SOLUTION: This liquid leakage sensor is constituted of a white thin paper 8 that becomes a transparent state by aspirating leakage liquids 2a and 2b, a thin paper holder 4 that places and maintains the thin paper 8 horizontally and is disposed on the bottom, a case that is inserted into the holder 4 and has a bottom composed of a transparent plate or a translucent plate, a light source means, a light accepting means and a liquid leakage detecting means. On one end of the thin paper 8, a clearance part is provided between the holder 4 and the case so that the leakage liquids 2a and 2b can penetrate rapidly when the leakage liquids 2a and 2b are contacted. A hole part 80 or a projection part is disposed in the reflection area and bubbles that generate near the reflection area of the thin paper 8 are let out to the outside of the reflection area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to water, an acidic solution,
The present invention relates to an improvement in a liquid leakage sensor that reliably detects leakage of a liquid having electrical conductivity such as an alkaline solution or a liquid having an insulating property such as organic such as alcohol, thinner, and benzene.

[0002]

2. Description of the Related Art In a conventional facility such as a factory, a liquid is supplied by piping. However, since connecting joints are provided at many places in the pipe, liquid often leaks from the joints. Therefore, depending on the type of liquid, humans must constantly monitor the leakage. As such a conventional liquid leakage monitoring method, a conductive method and a liquid amount method are known. Also, Japanese Patent Publication No. 4-70572 discloses that a filter which becomes transparent when absorbing a liquid leak is irradiated with light from a light source.
There is described a liquid leak sensor technology that can detect a liquid leak reliably by detecting a change amount of transmitted light or reflected light from the filter when there is a liquid leak. FIG. 1 is a view showing the principle of such a conventional reflection-type liquid leakage sensor 20, in which thin paper and a case holder 4 are provided on a floor surface 1 with a bottom surface 4 thereof.
a is painted black and fixed with a stopper 6 such as a screw also serving as a reflection plate, and a white thin paper (or cloth, synthetic resin or the like) 8 is horizontally placed thereon. A case 12 whose bottom 12a is formed of a transparent or translucent member is inserted into the holder 4. Inside the case 12, a light source 14, a light receiving unit 16, and a detecting unit 18 including a comparator and the like are integrated. And is connected to the outside via a cable 26. The case 12 also serves as a dust-proof and water-proof lid. However, in order to make it easier for the leaked liquid 2 to penetrate into the central reflection area 8b of the thin paper 8 and to shorten the time for detecting the leaked liquid, the bottom of the case is used. A gap 10 is provided between the thin paper 8 and 12a. This gap is preferably several mm or less in order to avoid dirt such as dust and dust and to detect reflected light from the thin paper 8 stably without detecting external noise light. In addition, it was found that the use of a filter having a structure in which the reflection plate 4a and the case 12 were detachable facilitated replacement and installation work of the thin paper 8. Furthermore, since the location where the liquid leaks cannot be generally specified, the thin paper is generally preferably circular in order to respond quickly to the liquid leaking from any direction. Was. In such a configuration, light 22 is emitted from light source means 14 such as an LED, an infrared laser light emitting element, or an optical fiber, and white reflected light 24 from thin paper 8 is constantly detected by light receiving means 16. Thus, when the liquid 2 leaks on the floor surface 1, the liquid 2 permeates sequentially from the contact portion 9 into the reflection area 8b of the thin paper 8, and the contact portion 9 of the thin paper 8 turns white due to the permeation of the liquid. Change to transparent color. However, since the reflection plate 4a on the lower side of the thin paper 8 is black, the color of the thin paper 8 changes from white to black at the contact part 9, and the reflected light 24 to the light receiving means 16 is absorbed by the reflection plate 4a and greatly reduced. The change in the amount of reflected light is detected by the detecting means 18 to detect liquid leakage.

[0003]

However, the above-mentioned conventional optical liquid leak sensor has the following problems which could not be expected at first. (A) Holder bottom surface 4a on floor surface 1
When the high-pressure pipe and the large-diameter pipe are damaged and a large amount of liquid is leaked at a time in a state where the case bottom 12a is installed in a substantially horizontal state, the lower part of the case 12 has almost the entire circumference. At the same time, it is submerged in the leaked liquid. In this state, when the leaked liquid 2 starts to infiltrate sequentially from the outer edge of the thin paper 8 toward the inside thereof, the gas existing in the gap 10 between the holder bottom surface 4a and the case bottom 12a is partially foamed to form the case 12 Is discharged to the outside, but the gas in the vicinity of the center of the gap 10 is in a state where its surroundings are blocked by liquid leakage, and as shown in FIG. The reflection area 8b stayed at the reflection area 8b, and after many hours, the reflection area 8b did not become transparent and a large amount of liquid leakage could not be detected. (B) However, the holder bottom surface 4a is horizontal and flat.
Is currently being used in large quantities, so replacing the holders 4 fixed to the floor 1 one by one takes an enormous amount of time,
Almost impossible. (C) Further, the thin paper 8 is also a consumable item, and is discarded every time a liquid leak is detected. If possible, it is desirable that there is an opportunity to use the conventional thin paper 8 as it is. Therefore, the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to stably and surely leak liquid without being affected by bubbles even when a large amount of liquid leaks at once. It is an object of the present invention to provide a liquid leakage sensor, a thin paper for the liquid leakage sensor and a holder for the liquid leakage sensor capable of detecting the liquid leakage. Further, the object of the present invention is to provide a volatile and flammable liquid with a risk of explosion, even if such liquid is generated in large quantities at a time while paying attention to explosion protection.
An object of the present invention is to provide a leak sensor, a thin paper for the leak sensor, and a holder for the leak sensor capable of detecting a leak safely and securely at a remote place without being affected by bubbles or the like.

[0004]

According to the present invention, there is provided a thin paper holder which becomes transparent by absorbing a leaked liquid, a thin paper holder which horizontally mounts and holds the thin paper and forms a reflection plate on the bottom surface, A case which is inserted into the holder and whose bottom is formed of a transparent plate or a translucent plate, light source means for irradiating the thin paper with light through the transparent plate or the translucent plate, and receiving reflected light from the bottom surface of the holder A light leak sensor is constituted by a light receiving means and a detecting means for detecting a liquid leak based on information data from the light receiving means, and the light source means and the light receiving means are integrated and housed in the case, and one end of the thin paper is provided. The present invention relates to a liquid leakage sensor in which a gap is provided between the holder and the case so that the liquid can quickly penetrate when the liquid comes into contact with the liquid. Of circular or non-circular shape In the case, a hole is provided at an asymmetrical position / shape with respect to the reflection area at an intermediate portion excluding the outer edge and the reflection area of the thin paper so that air bubbles do not stay in the reflection area of the thin paper detected by the light receiving means. This is achieved by preventing bubbles from remaining in the reflection area of the thin paper even when a large amount of liquid leaks at once.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 (A) is a thin paper 8 for a liquid leakage sensor which can be used in both the reflection type liquid leakage sensor and the transmission type liquid leakage sensor of the present invention.
In this example, the outer edge 8c of the circular thin paper 8 and the reflection area 8
A hole 80 is provided at an intermediate position excluding b at a position and a shape asymmetric with respect to the reflection region 8b. If such thin paper is replaced with conventional thin paper and the holder 4, the case 12 and the like are used as they are (FIG. 2 (B)), as shown in FIG. 2 (C), the liquid leaks to the outer edges 9a and 9b. Are partially in contact with each other, the holes 80 are provided in the middle, so that the routes 9a to 9
e or 9b to 9c sequentially penetrates, and the leaked liquid reaches the reflection area 8b.
Changes from white to transparent color, and the leak can be detected by detecting the amount of change in the amount of reflected light 24 according to the same principle as in FIG. Also, the outer edges 9c, 9d, 9 in FIG.
In the case where a part of the leaked liquid comes into contact with e, the leaked liquid can be detected in substantially the same detection time as in the prior art. If a large amount of liquid 2 overflows on the floor 1 at one time, the thin paper 8 is conventionally used.
Because there is no hole, the liquid leaks from the outer edge at almost the same penetration rate, and the gas absorbed in the thin paper etc. is collected while being compressed by the osmotic pressure in the central reflection area,
When the pressure of the gas and the pressure of the leaking liquid are balanced, a bubble 7 is formed, and the bubble stays in the reflection area 8b, so that the leak cannot be detected. On the other hand, in the thin paper 8 provided with the hole 80 as shown in FIG. 2A, the time required for the leaked liquid to penetrate from the outer edge to the central reflection area 8b is different, so that the thin paper 8 is absorbed by the thin paper or the like. The gas is sequentially pushed out into the holes 80 to form bubbles 7, and the leaked liquid 2 can be surely penetrated into the reflection area 8 b. Therefore, it was confirmed by an experiment that the reflection area 8b changed from white to transparent color (FIG. 2A), the irradiation light 22 was absorbed by the black bottom surface 4b of the holder 4, and the liquid leakage 2 could be detected. Experiments have confirmed that this phenomenon is effective not only for water but also for highly viscous liquids such as hydrochloric acid and sulfuric acid. Therefore, for the existing optical liquid leak sensor, it is possible to reliably detect a large amount of liquid leak at once by simply replacing the thin paper 8 with a thin paper 8 changed to a shape as shown in FIG. Will be able to

Next, FIG. 3 shown in correspondence with FIG. 2 shows another embodiment of the present invention, in which the devices denoted by the same reference numerals perform the same functions and are shown in FIG. If you continue to use the conventional thin paper 8 without a hole,
For example, as shown in FIG. 3B, convex portions 4b to 4e are provided at positions including the reflection area on the bottom surface 4a of the holder 4, and FIG.
As shown in (C), when the thin paper 8 is placed horizontally on this and sandwiched by the bottom 12a of the case 12, the relative distance between the thin paper 8 and the holder bottom surface 4a can be made non-uniform. ~
The gap between 4e and the thin paper 8 can be made narrower than the other bottom surface. In such a configuration, when the leaked liquid 2 comes in contact with a part of the outer edge of the thin paper 8, the leaked liquid 2 permeates the thin paper 8 sequentially as in the related art, and reaches the central reflection area 8b. Since the convex portion 4b on the bottom surface of the holder 4 is provided close to the reflection region 8b, the liquid leaks quickly penetrates around the convex portion 4b due to the capillary phenomenon. As a result, since the thin paper 8b changes from white to transparent color, the reflected light 24 is greatly reduced, and the change is detected by the light receiving means 16 and the detecting means 18 and output to the outside. When a large amount of the leaked liquid 2 overflows to the floor surface 1 at a time, the leaked liquid 2 permeates at substantially the same permeation speed from the outer edge of the thin paper 8 toward the center. The gas absorbed by the thin paper or the like also moves toward the center with the permeation. However, unlike FIG. 1A, a convex portion 4b is formed on the holder bottom surface 4a as shown in FIG. 3C. Since it is provided, the inside of the convex portion 4b is set to a state where the osmotic pressure of the liquid is much higher than the outside. Therefore, if the convex portion 4b is provided with an area sufficiently larger than the size of the bubble 7, the leaked liquid 2 can surely reach the outer peripheral portion of the convex portion 4b, and once the leaked liquid 2 Of the thin paper 8 sandwiched between the convex portion 4b and the case bottom portion 12a, an osmotic pressure higher than the surroundings is generated. The air bubbles 7a and 7b shown in FIG. 3C are pushed out of the projection 4b. As a result, the color of the reflection region 8b changes from white to a transparent color, and a decrease in the reflected light 24 is detected and output to the outside in the same manner as described above. FIG. 4 corresponding to FIG. 1 and FIG. 3 shows another embodiment of the present invention, and the devices having the same numbers perform the same functions, respectively.
Since the liquid leakage detection unit eliminates electric wiring and transmits and receives light to the thin paper 8 by optical transmission means 44 and 46 such as optical fibers, even when the liquid 2 is volatile and there is a danger of ignition or explosion. The liquid leak detection by reflected light can be performed very safely. The light from the light source 14 provided at a remote place is transmitted to the bottom 12a of the case 12 by the optical transmission means 44.
And transmitted to the light receiving means 16 provided at a remote place via the light transmitting means 46, and the output information thereof is detected by the detecting means 1.
8 to determine whether there is a liquid leak. Further, in the example of FIG.
a, including the area corresponding to the reflection area 8b outside
2b and 12c to 12e, the thin paper 8 and the case bottom 1
The structure is such that the relative distance to 2a is not uniform and conventional thin paper 8 without holes can be used. The bottom surface 4a of the holder 4 may be flat as shown in FIG. 1A, or may be provided with protrusions 4b to 4d as shown in FIG. Then, even when the case 12 as shown in FIG. 4A is used, if the area of the convex portion 12b corresponding to the reflection region 8b is arranged sufficiently larger than the area of the bubble 7, FIG. According to the same principle as in C), the leaked liquid 2 is thin paper 8
Through the convex portion 12b, and the inner side of the convex portion 12b is more sufficiently than the outer portion thereof.
Is small, and the osmotic pressure of the liquid is high, so that all the gas contained in the reflection area 8b of the thin paper 8 is pushed out of the convex portion 12b to prevent air bubbles from staying in the reflection area 8b. Can be.

FIG. 5 corresponding to FIG. 1 shows still another embodiment of the present invention. In the drawings, devices denoted by the same reference numerals perform the same functions, and FIG. The case bottom 12a is cut into a two-stage conical shape, and is sandwiched between the reflection areas 8b of the thin paper 8 and has a conical top 12g having a gentle inclination with respect to the horizontal plane, and a cone for discharging all the bubbles generated in the gap 10 to the outside of the case. The guide surface 12h and the guide surface 12h prevent bubbles from stagnating at the cone top 12g including the area corresponding to the reflection area 8b. In FIG. 5B, a region including the reflection region 8b of the case bottom portion 12a is processed into a convex portion 12j such as a cone, and a bubble guide groove 12k is formed from the outer peripheral portion of the case 12 toward the convex portion 12j. When the case 12 having such a structure is used, the conical top 12
In the case where a large amount of water overflows at one time in the g and the protruding portion 12j, the pressure at which the water leaks 2 penetrates into the thin paper 8 is higher than in other places, so that all the gas absorbed in the reflection region 8b is conical top 12g. And a large amount of water leakage can be reliably detected. FIG. 6 corresponding to FIG. 1 shows still another embodiment of the present invention, in which the devices having the same numbers perform the same functions, and FIG. As a transparent or translucent member, for example, a double-sided tape 30 is attached, and in this state, it is attached to the bottom surface of the holder 4. However,
When a liquid member 30 such as an adhesive is used, the thin paper 8
Reacts and becomes transparent.
Is preferably in a solid form. Even in such a configuration, the reflection area 8b of the thin paper 8 has the member 30 laminated thereon and the gap becomes narrower than the outside, so that when the liquid leaks, the osmotic pressure of this part is relatively higher than that of the other area of the thin paper 8. It was confirmed by experiments that the bubbles were pushed out to the outside 7a and 7b of the reflection area 8b, and the liquid leak could be detected stably.

Next, FIGS. 7 and 8 corresponding to FIGS. 1 and 4 show another embodiment of the present invention, in which the devices denoted by the same reference numerals have the same functions. At the same time, in both figures, the leaked liquid is detected by detecting the transmitted light of the thin paper 8, respectively.
6 or light source means 14 embedded in the floor 1
2 is placed thereon to form the holder 4, and the thin paper 8 is further placed thereon, and the case 12 and the light receiving means 16 or the light source means 14 buried in the floor are connected by the connector 40. It has become. Also, in FIG. 8, the electric wire is not provided in the liquid leakage detecting section, and the optical transmission means 44, 4 such as an optical fiber is used.
6, the light is projected and received on the thin paper 8 so that even if the liquid 2 is volatile and there is a danger of ignition or explosion, the liquid leakage can be detected very safely by the transmitted light. Light from the light source 14 provided at a remote place is guided to the bottom 12a of the case 12 by the light transmission means 44, projected on the thin paper 8 as the light 22, and the transmitted light is transmitted through the lens 48.
After being converged by the optical transmission means 50, the optical connector 52 and the optical transmission means 46, the light receiving means 1 provided at a remote place is provided.
6 and the output information thereof is processed by the detecting means 18 to determine the presence or absence of liquid leakage. Also in the transmission type liquid leakage sensors 20a and 20b having such a configuration, conventionally, the thin paper 8 is horizontally placed on the holder bottom surface 4a, and the case 12 having the light source means 14 or the light receiving means 16 built therein is placed on the holder 4 from above. Because of the insertion structure, the thin paper 8 side of the case bottom 12a is set in a horizontal state substantially parallel to the floor surface, and a large amount of liquid is leaked at once as in the case of the reflective liquid leak sensor 20 of FIG. Overflows on the floor 1,
Air bubbles were generated in the central portion 8b of the thin paper 8, and the thin paper 8b did not change to a transparent color, and a large amount of liquid leakage could not be detected for many hours. However, FIG.
By providing a hole 80 in the thin paper 8 as shown in (A) and providing a time difference in the permeation speed so that the leaked liquid 2 does not concentrate on the permeation area 8b of the thin paper 8 from the outer peripheral portion at a substantially equal permeation speed, The inventor of the present application has found that the bubbles 7 that have been conventionally retained in the transmission region 8b can be guided to the holes 80 by the osmotic pressure that causes leakage, and the transmission region 8b can be changed to a transparent color. In addition, the above-mentioned bubble 7 is also transmitted through the transparent region 8b by the convex portion 12b provided at the bottom of the case as shown in FIG.
It turns out that it can be moved outside. Furthermore, as shown in FIGS. 5A and 5B, the case bottom 12a
It has been found that even if the grooves 12h and 12k for letting the bubbles 7 escape are provided, the bubbles 7 can be prevented from staying in the transmission area 8b.
It has been found that the techniques shown in FIGS. 2A to 5C have no problem even if a plurality of techniques are used in combination.

[0009]

As described above, according to the optical liquid leakage sensor of the present invention, the thin paper 8 used for the liquid leakage sensor is changed to a shape provided with a hole as shown in FIG. It is possible to continue using the existing holder and case for the leak sensor without any reduction in the existing leak detection capability by simply replacing it. Even in the case of a large accident that is not expected at first, or even for a liquid that is flammable and volatile and has a danger of explosion, the liquid leakage detection processing can be reliably executed. When the holder 4 or the case 12 can be replaced or newly installed, the conventional thin paper without a hole can be continuously used by using the holder or the case having the structure shown in FIGS. . Further, when a thin paper as shown in FIG. 2A is used in combination with a holder and a case having the structure shown in FIGS. It can be executed quickly and is very effective.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a conventional optical liquid leak sensor.

FIG. 2 is a diagram showing the structure and operation principle of the thin paper for a liquid leakage sensor according to the present invention.

FIG. 3 is a view showing an example of the structure of a liquid leakage sensor holder according to the present invention.

FIG. 4 is a view showing an example of the structure of a case for an explosion-proof reflective liquid leakage sensor of the present invention.

FIG. 5 is a view showing another example of the liquid leak sensor case of the present invention.

FIG. 6 is a view showing another example of the present invention.

FIG. 7 is a diagram showing an example of a transmission type liquid leakage sensor of the present invention.

FIG. 8 is a diagram showing an example of an explosion-proof transmission type liquid leakage sensor of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor surface 2, 2a, 2b Leakage of liquid 4 Holder 7 Bubbles 8 Thin paper 10 Gap part 12 Case 14 Light source means 16 Light receiving means 18 Detecting means 40 Connector 44, 46 Light transmission means 80 Hole part

Claims (10)

[Claims] 1. A thin white paper which becomes transparent due to the absorption of a leaked liquid, a thin paper holder which is placed and held horizontally, has a reflecting plate on the bottom surface and is disposed on the floor, and a holder for the thin paper. , A case having a bottom portion formed of a transparent plate or a translucent plate, light source means for irradiating the thin paper with light through the transparent plate or the translucent plate, and a light receiving device for receiving light reflected from the bottom surface of the holder Means and a detecting means for detecting a liquid leak based on information data from the light receiving means constitute a liquid leak sensor, the light source means and the light receiving means are integrated and housed in the case, and at one end of the thin paper If the leak comes in contact,
A leak sensor in which a gap is provided between the holder and the case so that the leak can quickly penetrate, or
White thin paper that becomes transparent due to the absorption of liquid leakage, a thin paper holder that horizontally places and holds this thin paper and forms a reflective plate on the bottom, and a transparent or translucent plate whose bottom is inserted into this holder and whose bottom is The case, the light source means for irradiating light, the first light transmission means for irradiating the light from the light source to the thin paper via a transparent plate or a translucent plate of the case, and the holder bottom surface A second light transmitting means for receiving and transmitting the reflected light from the first light transmitting means, a light receiving means for receiving the light from the second light transmitting means, and a detecting means for detecting a liquid leak based on information data from the light receiving means. And a liquid leakage sensor, wherein one end of the first optical transmission means and one end of the second optical transmission means are integrated into an optical path to form an optical path, and are housed in the case. If the liquid comes in contact with
In a liquid leakage sensor in which a gap is provided between the holder and the case so that liquid leakage can quickly penetrate,
The shape of the thin paper is a circle or a non-circular shape, and the outer edge of the thin paper and the intermediate portion excluding the reflection region so that air bubbles do not stay in the reflection region of the thin paper detected by the light receiving means. A liquid leak sensor characterized in that a hole is provided at an asymmetrical position and shape to prevent air bubbles from remaining in the reflection area of the thin paper even when a large amount of liquid leaks at once. 2. A thin sheet of white paper which becomes transparent due to the absorption of liquid leakage, a thin sheet holder which horizontally places and holds the thin sheet, forms a reflection plate on the bottom surface, and is disposed on the floor, and the holder. , A case having a bottom portion formed of a transparent plate or a translucent plate, light source means for irradiating the thin paper with light through the transparent plate or the translucent plate, and a light receiving device for receiving light reflected from the bottom surface of the holder Means and a detecting means for detecting a liquid leak based on information data from the light receiving means constitute a liquid leak sensor, the light source means and the light receiving means are integrated and housed in the case, and at one end of the thin paper If the leak comes in contact,
A leak sensor in which a gap is provided between the holder and the case so that the leak can quickly penetrate, or
White thin paper that becomes transparent due to the absorption of liquid leakage, a thin paper holder that horizontally places and holds this thin paper and forms a reflective plate on the bottom, and a transparent or translucent plate whose bottom is inserted into this holder and whose bottom is The case, the light source means for irradiating light, the first light transmission means for irradiating the light from the light source to the thin paper via a transparent plate or a translucent plate of the case, and the holder bottom surface A second light transmitting means for receiving and transmitting the reflected light from the first light transmitting means, a light receiving means for receiving the light from the second light transmitting means, and a detecting means for detecting a liquid leak based on information data from the light receiving means. And a liquid leakage sensor, wherein one end of the first optical transmission means and one end of the second optical transmission means are integrated into an optical path to form an optical path, and are housed in the case. If the liquid comes in contact with
In a liquid leakage sensor in which a gap is provided between the holder and the case so that liquid leakage can quickly penetrate,
A single or a plurality of protrusions are provided in the vicinity of the thin paper reflection area on the bottom surface of the holder and / or the bottom of the case, respectively, to make the relative distance between the thin paper and the bottom surface and / or the bottom nonuniform, thereby causing liquid leakage. A liquid leakage sensor characterized in that no air bubbles remain in the reflection area of the thin paper even when a large amount of water overflows at one time. 3. A thin sheet of white paper which becomes transparent due to the absorption of liquid leakage, a thin sheet holder which is placed and held horizontally, has a bottom surface forming a reflection plate, and is disposed on the floor surface, and this holder. , A case having a bottom portion formed of a transparent plate or a translucent plate, light source means for irradiating the thin paper with light through the transparent plate or the translucent plate, and a light receiving device for receiving light reflected from the bottom surface of the holder Means and a detecting means for detecting a liquid leak based on information data from the light receiving means constitute a liquid leak sensor, the light source means and the light receiving means are integrated and housed in the case, and at one end of the thin paper If the leak comes in contact,
A leak sensor in which a gap is provided between the holder and the case so that the leak can quickly penetrate, or
White thin paper that becomes transparent due to the absorption of liquid leakage, a thin paper holder that horizontally places and holds this thin paper and forms a reflective plate on the bottom, and a transparent or translucent plate whose bottom is inserted into this holder and whose bottom is The case, the light source means for irradiating light, the first light transmission means for irradiating the light from the light source to the thin paper via a transparent plate or a translucent plate of the case, and the holder bottom surface A second light transmitting means for receiving and transmitting the reflected light from the first light transmitting means, a light receiving means for receiving the light from the second light transmitting means, and a detecting means for detecting a liquid leak based on information data from the light receiving means. And a liquid leakage sensor, wherein one end of the first optical transmission means and one end of the second optical transmission means are integrated into an optical path to form an optical path, and are housed in the case. If the liquid comes in contact with
In a liquid leakage sensor in which a gap is provided between the holder and the case so that liquid leakage can quickly penetrate,
A transparent and / or translucent member is locally interposed between the bottom surface of the holder and / or the reflective region of the thin paper at the bottom of the case to provide a step, so that even if a large amount of liquid overflows at one time, A liquid leakage sensor wherein air bubbles are not left in a reflection area of the thin paper. 4. A thin paper sheet which becomes transparent due to absorption of a liquid leak, a thin paper holder which horizontally mounts and holds the thin paper, forms a reflection plate on the bottom surface and is disposed on the floor, and a holder for the thin paper. , A case having a bottom portion formed of a transparent plate or a translucent plate, light source means for irradiating the thin paper with light through the transparent plate or the translucent plate, and a light receiving device for receiving light reflected from the bottom surface of the holder Means and a detecting means for detecting a liquid leak based on information data from the light receiving means constitute a liquid leak sensor, the light source means and the light receiving means are integrated and housed in the case, and at one end of the thin paper If the leak comes in contact,
A leak sensor in which a gap is provided between the holder and the case so that the leak can quickly penetrate, or
White thin paper that becomes transparent due to the absorption of liquid leakage, a thin paper holder that horizontally places and holds this thin paper and forms a reflective plate on the bottom, and a transparent or translucent plate whose bottom is inserted into this holder and whose bottom is The case, the light source means for irradiating light, the first light transmission means for irradiating the light from the light source to the thin paper via a transparent plate or a translucent plate of the case, and the holder bottom surface A second light transmitting means for receiving and transmitting the reflected light from the first light transmitting means, a light receiving means for receiving the light from the second light transmitting means, and a detecting means for detecting a liquid leak based on information data from the light receiving means. And a liquid leakage sensor, wherein one end of the first optical transmission means and one end of the second optical transmission means are integrated into an optical path to form an optical path, and are housed in the case. If the liquid comes in contact with
In a liquid leakage sensor in which a gap is provided between the holder and the case so that liquid leakage can quickly penetrate,
The holder bottom and the case bottom are parallel to each other, and a groove with a slight inclination angle is provided so that air bubbles do not stay at the case bottom, or the case bottom is tilted and held in the holder, and bubbles are externally discharged from the case bottom. A liquid leak sensor characterized by being made to escape to 5. A thin paper sheet which becomes transparent due to absorption of liquid leakage, a thin paper holder which is placed and held horizontally and which has a reflecting plate on the bottom surface and which is disposed on the floor surface, and a holder for the thin paper sheet. , A case having a bottom portion formed of a transparent plate or a translucent plate, light source means for irradiating the thin paper with light through the transparent plate or the translucent plate, and a light receiving device for receiving light reflected from the bottom surface of the holder Means and a detecting means for detecting a liquid leak based on information data from the light receiving means constitute a liquid leak sensor, the light source means and the light receiving means are integrated and housed in the case, and at one end of the thin paper If the leak comes in contact,
A thin paper for a leak sensor in which a gap is provided between the holder and the case so that the leak can quickly penetrate, or a white thin paper that becomes transparent by absorbing the leak,
A thin paper holder that horizontally mounts and holds the thin paper and forms a reflection plate, a case that is inserted into the holder and whose bottom is formed of a transparent plate or a translucent plate, and light source means that irradiates light, First light transmitting means for irradiating the light from the light source to the thin paper via the transparent plate or translucent plate of the case, and second light transmitting means for receiving and transmitting the reflected light from the bottom surface of the holder Means, a light receiving means for receiving light from the second light transmitting means, and a detecting means for detecting a liquid leak based on information data from the light receiving means, forming a liquid leak sensor, One end of the light transmission means and one end of the second light transmission means are integrated so as to form an optical path and are housed in the case. When the liquid comes into contact with one end of the thin paper, the liquid quickly permeates. Air gap between the holder and the case Wherein the thin paper has a circular or non-circular shape, and an outer edge portion of the thin paper so that air bubbles do not stay in a reflection area of the thin paper detected by the light receiving means. And a hole in an intermediate portion excluding the reflection area, so that no bubbles remain in the reflection area of the thin paper even when a large amount of liquid leaks at a time. . 6. A thin paper sheet which becomes transparent due to the absorption of liquid leakage, a thin paper holder which is placed and held horizontally, has a bottom surface forming a reflection plate, and is disposed on the floor surface, and this holder. , A case having a bottom portion formed of a transparent plate or a translucent plate, light source means for irradiating the thin paper with light through the transparent plate or the translucent plate, and a light receiving device for receiving light reflected from the bottom surface of the holder Means and a detecting means for detecting a liquid leak based on information data from the light receiving means constitute a liquid leak sensor, the light source means and the light receiving means are integrated and housed in the case, and at one end of the thin paper If the leak comes in contact,
A leak sensor holder in which a gap is provided between the holder and the case so that the leak can quickly penetrate;
Alternatively, white thin paper that becomes transparent due to the absorption of liquid leakage, a thin paper holder that horizontally mounts and holds this thin paper and forms a reflective plate on the bottom, and a transparent plate or translucent bottom that is inserted into this holder and has a bottom part A case made of a plate, light source means for irradiating light, first light transmitting means for irradiating the thin paper with irradiation light from this light source via a transparent plate or translucent plate of the case, and the holder A second light transmitting means for receiving and transmitting the reflected light from the bottom surface; a light receiving means for receiving the light from the second light transmitting means; and detecting a liquid leak based on information data from the light receiving means. A liquid leak sensor comprising the detecting means, and one end of the first light transmitting means and one end of the second light transmitting means, which are integrated so as to form an optical system path, and are housed in the case; If the leak contacts one end of the A gap between the holder and the case so as to be able to penetrate the holder. To make the relative distance between the thin paper and the bottom and / or bottom portions non-uniform, so that no air bubbles remain in the reflection area of the thin paper even when a large amount of liquid leaks at once. A holder for a liquid leak sensor, characterized in that: 7. A thin white paper sheet which becomes transparent due to the absorption of liquid leakage, a thin paper holder which horizontally mounts and holds the thin paper sheet, and which includes light source means or light receiving means and which is disposed on the floor. A case which is inserted into the holder and whose bottom is formed of a transparent plate or a translucent plate, and a light receiving means which is built in the case and receives the transmitted light from the holder via the transparent plate or the translucent plate, or a light on the thin paper. And a detecting means for detecting a leak based on the information data from the light receiving means, constitutes a leak sensor, and when the leak comes into contact with one end of the thin paper, the leak quickly occurs. A leak sensor in which a gap is provided between the holder and the case so as to be able to penetrate, or a white thin paper which becomes transparent by absorbing the leak, and the thin paper is placed and held horizontally. Thin paper placed on the floor with A holder, a case inserted into the holder and having a bottom portion formed of a transparent or translucent plate, light source means for irradiating light, and first transmission means for transmitting irradiation light from the light source to the holder or case A second light transmitting means for receiving and transmitting the output light of the first light transmitting means transmitted to the holder or the case as transmitted light through the thin paper; and A light leak sensor is constituted by a light receiving means for receiving light and a detecting means for detecting a liquid leak based on information data from the light receiving means, and one end of the first light transmission means, the thin paper and the second The holder and the case are integrated so as to form an optical path at one end of the light transmitting means and housed in the case, and when the liquid comes into contact with one end of the thin paper, the liquid can quickly penetrate. Leaks with gaps between them In the sensor, the shape of the thin paper is a circle or a non-circle, and a hole is formed in an intermediate portion excluding an outer edge portion and a transmission region of the thin paper so that air bubbles do not stay in a transmission region of the thin paper detected by the light receiving unit. A liquid leakage sensor characterized in that air bubbles are not left in the transmission area of the thin paper even when a large amount of liquid overflows at one time. 8. A thin paper sheet which becomes transparent due to absorption of liquid leakage, a thin paper holder which horizontally mounts and holds the thin paper, and which is provided with a light source means or a light receiving means and which is disposed on the floor. A case which is inserted into the holder and whose bottom is formed of a transparent plate or a translucent plate, and a light receiving means which is built in the case and receives the transmitted light from the holder via the transparent plate or the translucent plate, or a light on the thin paper. And a detecting means for detecting a leak based on the information data from the light receiving means, constitutes a leak sensor, and when the leak comes into contact with one end of the thin paper, the leak quickly occurs. A leak sensor in which a gap is provided between the holder and the case so as to be able to penetrate, or a white thin paper which becomes transparent by absorbing the leak, and the thin paper is placed and held horizontally. Thin paper placed on the floor with A holder, a case inserted into the holder and having a bottom portion formed of a transparent or translucent plate, light source means for irradiating light, and first transmission means for transmitting irradiation light from the light source to the holder or case A second light transmitting means for receiving and transmitting the output light of the first light transmitting means transmitted to the holder or the case as transmitted light through the thin paper; and A light leak sensor is constituted by a light receiving means for receiving light and a detecting means for detecting a liquid leak based on information data from the light receiving means, and one end of the first light transmission means, the thin paper and the second The holder and the case are integrated so as to form an optical path at one end of the light transmitting means and housed in the case, and when the liquid comes into contact with one end of the thin paper, the liquid can quickly penetrate. Leaks with gaps between them In the sensor, a single or a plurality of protrusions are respectively provided near the thin paper transmission region on the holder bottom surface and / or the case bottom portion to make the relative distance between the thin paper and the bottom surface and / or the bottom portion non-uniform. The liquid leakage sensor is characterized in that even if a large amount of liquid leaks at one time, no bubbles remain in the transmission area of the thin paper. 9. A thin sheet of white paper which becomes transparent due to the absorption of liquid leakage, a thin sheet holder which horizontally mounts and holds the thin sheet, and incorporates light source means or light receiving means and which is disposed on the floor. A case which is inserted into the holder and whose bottom is formed of a transparent plate or a translucent plate, and a light receiving means which is built in the case and receives the transmitted light from the holder via the transparent plate or the translucent plate, or a light on the thin paper. And a detecting means for detecting a leak based on the information data from the light receiving means, constitutes a leak sensor, and when the leak comes into contact with one end of the thin paper, the leak quickly occurs. A leak sensor in which a gap is provided between the holder and the case so as to be able to penetrate, or a white thin paper which becomes transparent by absorbing the leak, and the thin paper is placed and held horizontally. Thin paper placed on the floor with A holder, a case inserted into the holder and having a bottom portion formed of a transparent or translucent plate, light source means for irradiating light, and first transmission means for transmitting irradiation light from the light source to the holder or case A second light transmitting means for receiving and transmitting the output light of the first light transmitting means transmitted to the holder or the case as transmitted light through the thin paper; and A light leak sensor is constituted by a light receiving means for receiving light and a detecting means for detecting a liquid leak based on information data from the light receiving means, and one end of the first light transmission means, the thin paper and the second The holder and the case are integrated so as to form an optical path at one end of the light transmitting means and housed in the case, and when the liquid comes into contact with one end of the thin paper, the liquid can quickly penetrate. Leaks with gaps between them In the sensor, the bottom surface of the holder and the bottom of the case are parallel to each other, and a groove with a slight inclination angle is provided so that bubbles do not stay at the bottom of the case, or the case bottom is tilted and held in the holder, and the case bottom is A liquid leakage sensor characterized in that bubbles are allowed to escape to the outside. 10. The liquid leakage sensor according to claim 1, wherein the optical transmission means is an optical fiber.