JP6598276B1 - Liquid level measuring tool - Google Patents

Abstract

A liquid level measuring instrument having a simple configuration is provided. The liquid level measuring device (1) according to the present invention has a long light guide material (2) for transmitting light color information, and a colored paint (3) is applied to one end face. Alternatively, two cross-sections (2c, 2d) facing each other are formed in a direction intersecting with the longitudinal direction in a gap or a notch portion provided at a predetermined position in a predetermined position along the longitudinal direction. One or both of the two cross-sections are concavo-convex so as to form a frosted glass, and when the liquid or colorless transparent liquid different from the paint is interposed in the gap or notch, A feature is that the color and the amount of light transmitted to the end face change in a recognizable manner. The liquid level can be measured based on changes in color and light amount transmitted to the other end face. [Selection] Figure 1

Description

  The present invention relates to a jig used when measuring a liquid level in a container.

  As a conventional device for measuring the liquid level, Patent Document 1 discloses a light projecting optical fiber, a mirror surface portion that reflects light from the light projecting optical fiber, and light receiving light that receives reflected light from the mirror surface portion. A liquid level sensor is disclosed that includes a fiber and a cylindrical case containing these components, and detects the presence or absence of liquid between the optical fiber and the mirror surface by the amount of light received by the optical fiber for light reception.

JP 2001-165751 A

  The liquid level sensor described in Patent Document 1 has a large number of parts and a complicated configuration. In addition, in the case of a liquid having a low refractive index, there is a problem that the amount of reflected light changes little.

  The present invention has been made to solve the above-described problems of the conventional example, and an object thereof is to provide a liquid level measuring instrument having a simple configuration, particularly a liquid level measuring instrument suitable for use in a dark room. To do.

  In order to achieve the above object, the liquid level measuring instrument of the present invention is a light-guided long material that transmits information on the color of light input to one end face to the other end face. A colored paint is applied or contained in a usage environment, and a predetermined interval is provided at a predetermined position along a longitudinal direction from a portion where the colored paint is applied or contained. Two gaps facing each other are formed in the gap or notch portion formed in a direction crossing the longitudinal direction, and one or both of the two cross-sections are provided with unevenness so as to be ground glass. The liquid level is measured based on a change in color and light amount transmitted to the other end surface when a color different from the paint or a colorless transparent liquid is interposed in the gap or notch. .

  The long material is preferably a transparent plastic bar or columnar material.

  The long material is preferably a transparent glass rod or column.

  The long material is preferably a flexible optical fiber.

  The long material is preferably a tube-shaped material having a light guide property.

  Furthermore, it is preferable to provide a light-guide funnel, and to connect the end face of the elongated material so as to convey color and light quantity information to the funnel.

  Furthermore, it is preferable that an inflow amount adjusting valve for the liquid passing through the long tube-like material having the light guiding property is provided.

  In the tube of the liquid level measuring tool of the light guide tube, the long material is longer than the long material, made of transparent plastic, transparent glass, or an optical fiber long material. It is preferable that the liquid level measuring tool has a configuration in which the long material is inserted, and two liquid levels can be measured.

  It is preferable that the elongate material includes a position fixing tool for disposing the gap or the notch at a desired liquid level position in a container in which a predetermined liquid is put.

  The paint is preferably a phosphorescent paint.

  The paint is preferably a luminescent paint.

  The paint is preferably a fluorescent paint.

  The gap or notch is fixed using a fixture that separates and cuts the long material obliquely with respect to the length direction, and fixes the separated long material at a predetermined interval. It is preferable that

  According to the liquid level measuring instrument of the present invention, when the liquid touches two cross-sections facing each other with a predetermined gap, the uneven ground glass cross-section becomes transparent, and the liquid is colorless and transparent water, The color of the paint applied or contained in the end surface of the liquid is clearly transmitted to the other end surface, and when the liquid is colored, the color of the liquid is clearly transmitted to the other end surface. Thereby, the liquid level can be measured.

It is a figure which shows the measuring tool of the liquid level which concerns on one embodiment of this invention, (a) is a front view, (b) is a left view, (c) is a right view, (d) is a rear view, e) is a plan view, and (f) is a bottom view. The state where the liquid level measuring tool is set in the cup is shown. (A) is the state of the end face before the liquid poured into the cup reaches the detection position, (b) is the state when the detection position is exceeded while pouring a colorless transparent liquid, and (c) is the color The state when the liquid exceeds the detection position while pouring a certain liquid is shown. Explanatory drawing in the case of charging light from the observation end surface side using light to the phosphorescent agent on the liquid level detection end surface side of the liquid level measuring tool. The figure which shows the modification of the measuring tool of a liquid level. (A) (b) (c) shows about the modification of the space | gap or notch part provided in the elongate material of the measuring tool of a liquid level. The figure which shows different embodiment of the measuring tool of a liquid level. The figure which shows further another embodiment of the measuring tool of a liquid level.

  The liquid level measuring instrument of the present invention uses a light-guided long material that transmits information on the color of light input to one end face to the other end face. One end face is coated with or contains a colored paint under the usage environment. Two cross-sections facing each other in a gap or notch provided at a predetermined position at a predetermined position along a longitudinal direction from a portion where a colored paint is applied or contained in the longitudinal direction It is formed in the direction that intersects. One or both of the two cross sections are uneven so as to be ground glass. Measure the liquid level based on changes in color and light intensity transmitted to the other end when a different color or colorless and transparent liquid is interposed in this gap or notch where two cross sections face each other. It is characterized by. When a liquid touches two cross-sections facing each other, the cross-section with ground glass-like irregularities becomes transparent, and when the liquid is colorless and transparent water, the color of the paint applied or contained on one end face is the other. When the liquid is clearly transmitted to the end face and the liquid is colored, the color of the liquid is clearly transmitted to the other end face. The liquid level can be measured based on changes in the color and the amount of light transmitted to the other end face. In addition, by using luminescent paint, phosphorescent paint, and fluorescent paint as paints, it is possible to safely and safely measure the liquid level of liquids that are strictly prohibited from fire or overflowing from containers in a dark room or other usage environment. It can be carried out. In addition, there is also an advantage that after use, if the liquid adhering to the cross-sectional portions facing each other is removed, it can be reused quickly.

  A liquid level measuring tool 1 according to an embodiment of the present invention will be described. FIG. 1 shows a six-sided view of a liquid level measuring instrument 1. 1A is a front view, FIG. 1B is a left side view, FIG. 1C is a right side view, FIG. 1D is a rear view, FIG. 1E is a plan view, and FIG. The liquid level measuring tool 1 uses a long light guide material 2 that transmits information on the color of light input from one end face 2a to the other end face 2b. The long material 2 of the present embodiment is made of a cylindrical transparent plastic (acrylic resin) having a diameter of 8 mm and a length of 150 mm. In addition, a rod-shaped transparent plastic, a transparent glass bar or columnar material, a flexible optical fiber, a light guide tube described later, and the like can be used for the long material 2.

  A colored paint 3 is applied to one end face 2a under the usage environment. If the coated area is coated with a resin resistant to the liquid using the liquid level measuring instrument 1 after the paint 3 is applied, the paint 3 can be prevented from dissolving in the liquid. It is effective in the case of edible liquids, precision inspection liquids, etc., and helps maintain the performance of the liquid level measuring instrument 1. Alternatively, at the time of manufacturing the long material 2 or after manufacturing, one end 2a is heated so that the paint can be mixed, for example, in a gel or dissolved state, and the paint 3 is mixed, and the paint 3 is applied to the end surface 2a. May be included. When the usage environment is mainly outdoors in the daytime or in a bright room, the paint 3 is fluorescent. When the usage environment is outdoor at night, in a dark room (for example, underground wine warehouse), the paint 3 is a colored paint that emits light in a dark usage environment, for example, a phosphorescent or luminous material.

  The long material 2 is provided with gaps or notches at predetermined intervals along the longitudinal direction from the portion where the paint 3 is applied or contained, and two cross-sections facing each other are the longitudinal direction. It is formed in a crossing direction. For example, a cross section 2c is formed at a position of 15 mm from the end surface 2a to the end surface 2b along the longitudinal direction (the direction indicated by the double arrow α, the same applies hereinafter) from the end surface 2a to the end surface 2b. A gap 2g (for example, 10 mm) is opened to form a cross section 2d facing each other. The cross sections 2c and 2d are formed in a direction intersecting with the longitudinal direction, that is, not in a direction parallel to the longitudinal direction of the long material 2, but in an orthogonal direction or an oblique direction.

  In the present embodiment, the long material 2 is cut obliquely with respect to the longitudinal direction to be separated into two portions 2e and 2f, and a space 2g (for example, 10 mm) indicated by a double arrow is opened in the portions 2e and 2f. And the structure hold | maintained with the two fixing tools 4a and 4b is employ | adopted. Instead of opening a gap, a portion corresponding to the fixture 4a or the fixtures 4a and 4b is formed in the long material 2 main body, and a space corresponding to the gap 2g is cut away to obtain a cross section 2c. 2d may be formed (see FIG. 6).

  The end portions 4c and 4d on the end face 2b side of the fixtures 4a and 4b are bonded to the portion 2f, and the other ends 4e and 4f are configured to sandwich the portion 2e and fix the position by the sandwiching force. Also good. In this case, the value of the gap 2g between the portion 2e and the portion 2f can be adjusted.

  One or both of the two cross sections 2c and 2d are uneven so as to be ground glass. “Roughness to form a ground glass” means that the surface of the transparent glass is a hard substance (eg sandpaper, saw) with many protrusions, or a hard granular material (eg, gold sand). Or by spraying at high speed (for example, sandblasting), making it uneven and making it opaque, and scattering processing so as to prevent linear transmission of light rays. Since the material of the long material 2 is not limited to transparent glass, the term “provided with irregularities so as to become a ground glass” is used. For example, when a transparent plastic (acrylic resin) is used as the material of the long material 2, when the long material 2 is cut and separated with a saw, the two cross sections 2 c and 2 d are in a state with irregularities that become ground glass. . For example, in the case of an optical fiber, the cross-section portion of the glass fiber is provided with irregularities so as to have the ground glass shape. When a liquid is applied to the cross-section of the frosted glass surface, the light diffusing property is lost and the glass becomes transparent and the light transmitting property increases. In other words, a simply opaque glass (for example, bubble glass) that does not increase transparency even when a liquid is attached is not “irregularly formed to be ground glass”. The liquid level measuring tool 1 has a color or light amount transmitted to the end face 2b when a color different from the paint 3 or a colorless transparent liquid is interposed in the gaps or notches facing each other between the two cross sections 2c and 2d. The liquid level is measured based on the change. That is, of the cross sections 2c and 2d, the position of the surface that is roughened in the shape of ground glass is the liquid detection position (hereinafter referred to as the liquid detection position). When both of the cross sections 2c and 2d are frosted and rough, the position of the cross section 2d on the side close to the end face 2b is the liquid detection position.

  In the vicinity of the end surface 2b of the portion 2f of the long material 2, it can be moved up and down along the longitudinal direction. A clip 5 is attached as a position fixing tool for arranging the detection position. A scale 2h is provided on the side of the portion 2f. The clip 5 includes a long material 2, a connecting portion 5 a of the clip 5, and a clip portion 5 b. Various variations of the length of the connecting portion 5a and the shape of the clip portion 5b can be considered according to the thickness, shape, and the like of the attachment portion of the container that is assumed to be attached. The length from the attachment position to the portion 2f of the clip 5 to the liquid detection position can be adjusted. By adopting this configuration, the position of the long material 2 can be fixed to a liquid inlet such as a cup, a beaker, a drum can, a barrel, a bottle, or a shampoo container used for measuring the liquid level. Since both hands are free, the user can pour the liquid himself.

  In addition, in order to increase the light extraction efficiency on the end surface 2b side of the long material 2, if the long material 2 is wrapped with a reflective material that reflects inward without escaping light from the side surface such as aluminum foil, the end surface 2b side The light color change and the light quantity change can be clearly recognized. The same applies to the following modifications and different embodiments.

  FIG. 2 shows a state in which the liquid level measuring device 1 having the configuration shown in FIG. 1 is fixed to the opening edge 20 a of the cup (or beaker) 20 using the clip 5. In this state, a colorless and transparent liquid and a colored liquid were poured, and the color and brightness seen from the end face 2b of the long material 2 were examined.

  FIG. 3 shows the color and brightness information visible on the end face 2b when the cross section 2c is ground glass and the cross section 2d is clear. FIG. 3A shows a light green color that can be seen from the end face 2b when the liquid level does not reach the cross section 2c in the measuring tool 1 in which the phosphorescent paint 3 that emits green light in the dark room is applied to the end face 2a. Since the cross section 2c is ground glass, it looks light green. When a colorless and transparent liquid is attached to the frosted glass-like cross section 2c, the cross section 2c becomes transparent and the translucency increases. FIG. 3B shows a bright green color that can be seen from the end face 2b when the liquid level reaches the top of the cross section 2c when the liquid is a colorless and transparent liquid. FIG. 3C shows the color of the liquid seen from the end face 2b when the liquid level reaches the cross section 2c when the liquid is a colored liquid. It was confirmed that the color information of the paint 3 was clearly transmitted to the end face 2b. Even when the liquid level further increased and exceeded the cross-section 2d, the cross-section 2d was originally clear, so that the change in transparency was small, and as a result, the change in the color and the amount of light seen from the end face 2b was also small.

  When the cross section 2c and the cross section 2d are ground glass, or when the cross section 2c is clear and the cross section 2d is ground glass, when the liquid level reaches the cross section 2d beyond the cross section 2c, the cross section 2d becomes transparent and the transmissivity increases. When the liquid is a colorless and transparent liquid, the color information of the colored paint 3 is transmitted clearly to the end face 2b. When the liquid is a colored liquid, the color of the liquid is clearly transmitted to the end surface 2b.

  Various experiments were conducted, but when a colored (for example, red) fluorescent paint was used for the paint 3, the liquid level could be measured (visually confirmed) in a bright room. When a colored (for example, green) phosphorescent or luminous material is used for the paint 3, the liquid is a liquid based on the color and amount of light transmitted to the end surface 2 b in a bright room and a dark room. It was possible to satisfactorily measure (visual confirmation) whether or not the detection position was reached. The liquid level measuring instrument 1 can safely and safely measure the liquid level of liquids that are strictly prohibited from fire or liquids that are not handled to overflow from containers. In addition, after use, there is an advantage that the liquid adhering to the opposing cross sections 2c and 2d can be removed and reused quickly.

  Concavities and convexities attached to one or both of the cross-sections 2c and 2d at the detection position so as to have a ground glass shape increase the difference between the opacity when no liquid is attached and the transparency when the liquid is attached. It is attached to. The unevenness may be formed in a number of lines aligned in the direction in which the liquid is to be washed away. In this case, it becomes easy to remove the liquid adhering to the cross sections 2c and 2d.

  FIG. 4 shows a method for charging the light-storing paint 3 on the end surface 2a by applying the light 30 from the end surface 2b on the side to be observed using the long light guide material 2 Show. Since the light from the light 30 is much brighter than the light emitted from the phosphorescent agent, the phosphorescent paint 3 could be charged with no problem even if there was an end face processed into a ground glass in the middle. When the vicinity of the end face 2a is not covered with an opaque coating material to prevent the paint 3 from being melted, naturally, the light may be directly applied to the end face 2a to charge the phosphorescent paint 3 with light. .

  FIG. 5 is a perspective view showing a liquid level measuring instrument 1 ′ according to a modification. In the liquid level measuring tool 1 ′, a flexible light guide long material 6 is used instead of the long material 2. The configuration of the portion for measuring the liquid level is the same as that of the liquid level measuring tool 1, and a duplicate description thereof is omitted here. By adopting this configuration, the liquid level can be measured at a position that is easy for the detector to see, and convenience is improved.

  FIG. 6 (a) shows a columnar portion 4a ′ instead of the fixtures 4a and 4b (see FIG. 1) as a modification of the gap or notch provided in the elongated member 2 of the liquid level measuring device 1. A case where the long material 2 is notched so as to be left and cross sections 2c and 2d and portions 2e and 2f are formed is shown. FIG. 6B shows a modified example in which the long material 2 is cut out so as to leave two columnar portions 4a ′ and 4b ′ instead of the fixtures 4a and 4b, and the cross sections 2c and 2d and the portion 2e. 2f is formed. FIG. 6C shows a modified example in which the long material 2 is cut out so as to leave a columnar portion 4a ′ having a diameter of 1.5 mm, for example, along the axis of the long material instead of the fixtures 4a and 4b. In this example, the cross sections 2c and 2d and the portions 2e and 2f are formed.

  In addition, as a modification of the gap or notch portion provided in the long material 2 of the liquid level measuring instrument 1, the long material 2 is separated and cut into portions 2e and 2f, and a rod-shaped member having a diameter of, for example, 1.5 mm is provided therebetween. The gap 2g and the cross sections 2c and 2d may be formed by interposing a fixing tool (for example, an iron needle-shaped member with sharp ends).

  FIG. 7 shows a liquid level measuring device 40 according to a different embodiment. In this embodiment, it is light-guided and is connected to a tubular long material 41 having an outer diameter of 12 mm, an inner diameter of 10 mm, and a length of 120 mm, and the upper edge of the long material 41, and is outside the lower end face 42 a. A light guide funnel 42 having the same diameter and inner diameter as the long material 41, an outer diameter of the upper end face 42b of 30 mm, an inner diameter of 28 mm, and a length from the end face 42a to the end face 42b of 35 mm. It is characterized by. The end surface 41b of the long material 41 is connected to the end surface 42a of the funnel 42 so as to convey information on color and light quantity. The long material 41 has a predetermined position, for example, a position of 15 mm from the end surface 41a to the end surface 41b, along a longitudinal direction (direction indicated by a double arrow β; the same applies hereinafter) from the end surface 41a to the end surface 41b. In addition, two ring-shaped cross-sections 41d and 41e facing each other with a predetermined gap 41c (for example, 10 mm) are not in a direction intersecting with the longitudinal direction, that is, in a direction orthogonal to the longitudinal direction of the long material 41. Further, it is formed in an oblique direction. In the present embodiment, the long material 41 is cut obliquely with respect to the longitudinal direction to be separated into two parts 41f and 41g, and the two parts 41f and 41g are fixed in a state where a gap 41c is opened. The structure hold | maintained with the tools 43a and 43b is employ | adopted. In addition, the end portions 43c and 43d on the funnel 42 side of the fixtures 43a and 43b are bonded to the portion 41g, and the other ends 43e and 43f adopt a configuration in which the portion 41f is sandwiched and the position is fixed by the sandwiching force. Also good. In this case, the interval between the portion 41f and the portion 41g can be adjusted. One or both of the cross-sections 41d and 41e are uneven so as to be ground glass. The portions 41f and 41g are communicated with each other by a cylindrical member 44. When the portion 41f and the portion 41g are positioned and fixed by the tubular member 44, the fixing tools 43a and 43b can be omitted. A colored paint 3 is applied or contained in the end surface 41a of the portion 41f under the usage environment. The coating material 3 is the same as the coating material 3 of the liquid level measuring tool 1 shown in FIG. 1, and redundant description of the method of applying or including the coating material 3 on the end face 41a is omitted. A clip 45 whose position can be adjusted up and down in the longitudinal direction is attached to the upper portion of the portion 41g of the long material 41 and near the connecting portion with the funnel 42. A scale (not shown; refer to the memory 2h in FIG. 1) is provided on the side surface of the portion 41g, and the liquid detection position from the attachment position of the clip 45 to the portion 41g, that is, a ground glass shape. The length to the cross sections 41d and 41e can be adjusted. Near the portion where the long material 41 is connected to the funnel 42, an inflow control valve 41h for the liquid passing through the tubular long material 41 is provided.

  The liquid level measuring tool 40 having the above configuration can measure the liquid level based on the color and the amount of light transmitted to the end face 42b. For example, when the opening for injecting the liquid is relatively small like the diameter of the long member 41 of the measuring tool 40, by using the funnel 42 and the inflow amount adjusting valve 41h, without overflowing the liquid, The liquid can be poured to a desired position. It is possible to measure the liquid level of a liquid that is handled with care and not allowed to overflow from the container safely and securely. In addition, after use, the liquid adhering to the cross sections 41d and 41e facing each other can be removed and reused quickly.

  8 shows a tube-like long member 41 of the liquid level measuring device 40 shown in FIG. 7, and a long member 2 of the liquid level measuring device 1 shown in FIG. The liquid level measuring tool 50 comprised by these is shown. The same components as those already described are denoted by the same reference numerals, and redundant description is omitted. By adopting this configuration, it is possible to easily measure two liquid levels. For example, the rod-shaped long material 2 can be moved up and down in the long material 41 on the tube-shaped long material 41, but if the force is not applied, the rod-shaped long material 2 is inserted so as not to move by friction. If set, the clip 45 of the liquid level measuring unit 40 can be fixed to the container for measuring the liquid level. On the other hand, for the convenience of carrying, when used individually as the liquid level measuring tool 1 and the liquid level measuring tool 40, the tube-like long member 41 has a rod-like shape when used. What is necessary is just to set it as the dimension setting which the long material 2 can loosely fit. As described above, the liquid level measuring tool 50 has an advantage that the liquid level measuring tool 1 or the cylindrical portion 41 of the liquid level measuring tool can be used alone as required. In addition, by adopting this configuration, it can be made very compact during storage.

  Note that the long material 41 may be provided with a funnel 42 shown in FIG. In addition, when the phosphorescent paint 3 is applied to or included in the end face 41a, the end face 2b, 41b or the funnel on the side where the liquid level is confirmed using the light 30 is attached as shown in FIG. In this case, light can be charged from the end face 42b.

  In addition, this invention is not restricted to the structure of the said various embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, in the present embodiment, the liquid level is measured by visually confirming the change in color or the amount of light that appears on the end surface 2b (or the end surface 41b or the end surface 42b) of the long material. Since this is relatively clear, an imaging device such as a CCD that detects the color and light quantity can be set in this portion, and a processing apparatus that makes a determination based on the detection value can be configured. Specifically, the image sensor, a detection value processing unit, and a notification unit are provided, and the liquid level reaches the liquid detection position with an intermediate value of a change in color or light amount as a threshold value in the processing unit. The determination result of whether or not the liquid level is extracted as an electrical signal, and the notification unit is used to notify the user that the liquid level has reached the liquid detection position.

  Since the liquid level measuring instrument of the present invention does not measure the liquid level by using the current-carrying phenomenon of the electrical terminal, the storage amount check in the container of liquids that are strictly prohibited from fire or liquids that are not allowed to overflow with powerful drugs etc. Can do. Or the measuring tool of the liquid level of this invention can be used also in the area where electric power transmission is not carried out, or the area where a power failure has occurred. Since it has a very simple configuration, it can be used for checking the amount of stock in containers in areas where it is difficult to supply maintenance parts such as light sources for illumination. Further, when a phosphorescent agent or a luminescent paint is used for the paint 3, it can be used for checking the amount of stock in a container of a solution that can be handled only in a dark room or at night for direct or indirect reasons.

1, 40, 50 Liquid level measuring instrument 2, 41 Light-guided long material 42 Light-guided funnel 2a, 41a End surface 2b, 41b, 42b where colored paint is applied under the usage environment End faces 2c, 2d, 41d, 41e for seeing the color of the coming light Sections 4a, 4b, 43a, 43b Fixing tool 2g, 41c Air gap 41h Inflow rate adjusting valve

Claims (13)

In the light-guided long material that transmits information on the color of light input to one end surface to the other end surface, a colored paint is applied to or contained in the one end surface under a use environment, Two cross-sections facing each other are formed in a gap or notch provided at a predetermined position in a predetermined position along a longitudinal direction from a portion where a colored paint is applied or contained. It is formed in a direction that intersects with the direction, and one or both of the two cross sections are provided with unevenness so as to be ground glass, and the gap or notch has a color different from that of the paint or colorless and transparent A liquid level measuring tool, wherein the liquid level is measured based on changes in color and light amount transmitted to the other end surface when the liquid is interposed. The liquid level measuring instrument according to claim 1, wherein the long material is a transparent plastic bar or columnar material. The liquid level measuring tool according to claim 1, wherein the long material is a transparent glass bar or columnar material. The liquid level measuring instrument according to claim 1, wherein the elongated material is a flexible optical fiber. The liquid level measuring instrument according to claim 1, wherein the long material is a tube-shaped material having light guide properties. 6. The liquid level measuring instrument according to claim 5, further comprising a light-guiding funnel, wherein the end face of the elongated material is connected to convey color and light quantity information to the funnel. Furthermore, the liquid level measuring tool of Claim 5 or Claim 6 provided with the inflow amount adjustment valve of the liquid which passes along the said tube-shaped elongate material with the said light guide property. The liquid according to any one of claims 2 to 4, which is longer than the long material in the long material tube of the liquid level measuring device according to claim 5 or 6. A liquid level measuring tool having a structure in which a long material of a measuring tool is inserted and capable of measuring two liquid levels. The said elongate material is equipped with the position fixing tool for arrange | positioning the said space | gap or a notch in the position of the desired liquid level of the container which puts a predetermined liquid. Liquid level measuring instrument according to item. The liquid level measuring tool according to any one of claims 1 to 9, wherein the paint is a phosphorescent paint. The liquid level measuring tool according to any one of claims 1 to 9, wherein the paint is a luminescent paint. The liquid level measuring tool according to any one of claims 1 to 9, wherein the paint is a fluorescent paint. The gap or notch is fixed using a fixture that separates and cuts the long material obliquely with respect to the length direction and fixes the separated and cut long material at a predetermined interval. The liquid level measuring instrument according to any one of claims 1 to 12, wherein the measuring instrument is a liquid level measuring instrument.