JP2003075237A - Float liquid level meter with contact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a float liquid level meter with a contact not requiring explosion proof structure, capable of simple structure, reducing cost and easily knowing liquid level position. SOLUTION: The float liquid level meter with a contact 10 is provided with a rotational shaft 40 rotatably supported by a vessel 1, a float 42 going back and forth along the rotational shaft 40 according to the up and down displacement of the liquid surface, a pointer 28 pointing the liquid surface position according to the rotation of the rotational shaft 40, and a contact 20 emitting the contact output for control and notifies the liquid level position when the pointer 28 indicates a specific liquid level position. The contact 20 is provided to a joint member 11 attached to an attaching member 1. Since the contact 20 is provided to the joint member external of the attaching member, there is no fear of explosion due to switching in. Thus, the float liquid level meter with contact is not needed to be an explosion proof structure and so the structure becomes simple and cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float level gauge with contacts, and more specifically, it is used in a so-called stationary bulk container system in which LPG container is directly filled with liquefied petroleum gas (LPG) from a bulk truck. The present invention relates to a float level gauge with contacts attached to an LPG container or the like.

[0002]

BACKGROUND ART Conventionally, as a method for supplying LPG, L
It is known that a container filled with PG is transported by a truck and delivered to customers such as homes. On the other hand, there is a so-called bulk supply method in which an LPG container that is stationary at a demand destination is directly filled with LPG transported by a bulk truck.
This bulk supply system has come to be widely used for household and business use, partly because of deregulation. A liquid level gauge for checking and preventing overfilling of LPG by a bulk truck is attached to such a bulk supply type LPG container. Then, the liquid level gauge is attached by screwing a joint portion, to which the liquid level gauge is fixed, into the attachment portion of the LPG container.

By the way, for example, when it is desired to know the remaining amount of the LPG filled in the LPG container, it can be known by looking at the scale of the liquid level gauge. However, it is difficult to always look through the scale plate of the liquid level gauge. Therefore, LPG in the container
As a liquid level gauge that can easily know the remaining amount of
When the value drops below 0%, the remaining amount can be more surely known by performing centralized management such as by making it possible to contact the supply center through a telephone line or by sounding a buzzer. Also, when filling the LPG container with LPG, it is sufficient to pay attention to the scale of the scale plate so as not to overfill, but in order to prevent overfilling more reliably, the liquid level reaches a predetermined position. At that time, it is desired to sound a buzzer to give an alarm or to stop the supply pump. And
As an example of responding to the above demands, it is conceivable that a contact is connected to a liquid level gauge, and when the liquid level reaches a predetermined position, the contact works and a buzzer sounds.

[0004]

However, in order to make the above-mentioned contact point follow the displacement of the LPG, for example, the LP
If an attempt is made to install it in the G container, explosive gas exists in the container and there is a risk of explosion due to sparks generated when the switch is pressed. Therefore, the liquid level gauge including the contact points must have an explosion-proof structure. For example, there is a problem that it cannot be used as a fuel container, and the explosion-proof structure complicates the structure and increases the cost. Therefore, there is a demand for a float level gauge with a contact, which has a simple structure, is low in cost, and can easily know the liquid level position.

An object of the present invention is to provide a float level gauge with a contact, which has a simple structure without an explosion-proof structure, can reduce the cost, and can easily know the liquid level position.

[0006]

According to a first aspect of the present invention, there is provided a rotating member which is installed in a longitudinal direction and extends over a longitudinal direction of the member to be mounted, and is axially displaceable and rotatably supported at both longitudinal end portions thereof. A shaft, a float that moves back and forth along the rotary shaft in response to vertical displacement of the liquid surface contained in the mounted member, and a liquid surface position that is involved with the rotary shaft and that rotates in response to the rotation of the rotary shaft. A liquid level indicating means having a pointer for indicating the liquid level, and a contact for indicating the liquid level position by transmitting a predetermined control contact output when the pointer of the liquid level indicating means indicates a predetermined liquid level position. The contact point is provided on a joint member, and the joint member accommodates the liquid level indicating means and is detachably attached to the attached member.

According to the present invention as described above, in the float level gauge with contacts in the vertical mounted member, the contacts are
Since it is provided outside the member to be mounted and on the joint member that is a member different from the member to be mounted, there is no risk of explosion due to input of a switch. Therefore, since the float level gauge with contacts does not have to be an explosion-proof structure, the structure is simple and the cost can be reduced. Also, when the contact point of the liquid level indicating means indicates a predetermined liquid level position, the control contact output is transmitted to inform the liquid level position.If the control contact output is connected to a buzzer, etc. , The buzzer sounds to easily detect the liquid level such as the remaining amount of liquid inside the vertical mounted member, and take early measures such as replenishing liquid arrangement and overfilling prevention. You can

In the present invention, the member to which the float liquid level gauge with contacts is used may be any member as long as it can measure the liquid level of the filling material housed therein. Examples include a portable LPG container such as a bulk storage tank filled with LPG, and other small and medium-sized containers and storage tanks that store other fuel, water, a low-viscosity solution, and the like. Further, the contact may be any one as long as it outputs a predetermined control contact output when the liquid level indicating means indicates a predetermined liquid level position. For example, a magnetic force using a reed switch and a magnet. A method, a method using a potentiometer, a method using an optical sensor, or the like can be used.

According to a second aspect of the present invention, a rotary shaft which is orthogonal to the longitudinal direction of the member to be mounted horizontally and is rotatably provided, and which is connected to the rotary shaft through a support shaft. The float that moves according to the vertical displacement of the liquid surface housed inside the mounted member and the connecting portion between the rotary shaft and the support shaft are provided, and the vertical movement of the float causes the rotary shaft to rotate. A rotary drive means for converting and rotating the rotary shaft, a liquid level indicating means which is related to the rotary shaft and has a pointer for indicating the liquid level position according to the rotation of the rotary shaft, and a pointer of the liquid level indicating means. And a contact for notifying the liquid surface position by transmitting a predetermined control contact output when indicating a predetermined liquid surface position, the contact being provided in a joint member, and the joint member being the liquid surface. If you store the instruction means Wherein a contact with the float level gauge, characterized in that the removably attached to the mounting member.

According to the present invention as described above, in the float level gauge with contacts in the horizontal mounted member, the contacts are
Since it is provided outside the member to be mounted and on the joint member that is a member different from the member to be mounted, there is no risk of explosion due to input of a switch. Therefore, since the float level gauge with contacts does not have to be an explosion-proof structure, the structure is simple and the cost can be reduced. Also, when the contact point of the liquid level indicating means indicates a predetermined liquid level position, the control contact output is transmitted to inform the liquid level position.If the control contact output is connected to a buzzer, etc. By sounding the buzzer, it is possible to easily detect the remaining amount of the internal liquid of the vertical mounted member, and it is possible to take an early action such as arrangement of the supplementary liquid.

In the present invention, it is preferable that the attached member and the contact in which the float level gauge with a contact is used are the same as those used in claim 1.

According to a third aspect of the present invention, in the float level gauge with contacts according to the first or second aspect, the contact is a reed switch fixed to the joint member and the liquid level indicating means side. And a rotatable magnet provided in the.

According to the present invention as described above, since the reed switch and the magnet are respectively provided on the side of the joint member and the liquid level indicating means which are indispensable for constructing the liquid level gauge,
A dedicated member for providing the reed switch and the magnet is not required, and therefore the structure is simple. In the present invention, the direction of the reed switch is not limited, but it is preferable that the reed switch is arranged so that the longitudinal direction of the reed switch is oriented in the direction orthogonal to the axis of the rotation axis of the magnet.

According to a fourth aspect of the present invention, in the float level gauge with contacts according to the third aspect, the reed switches are provided at a plurality of positions. According to the present invention as described above, if the plurality of installation positions of the reed switch are made to correspond in advance to the liquid level positions of a plurality of stages where it is desired to know the remaining amount of the internal liquid of the mounted member, the predetermined positions can be set by the rotation of the magnet. Since the reed switch of (1) is activated and the control contact output is transmitted, it is possible to easily detect the liquid level height in a plurality of stages, and it is possible to perform an early treatment such as preparation for replenishment of the internal liquid. In the present invention, the reed switch may be installed at a plurality of locations, for example,
It can be provided at two places corresponding to the remaining amount of 40% and 20%, or at three places corresponding to the preset remaining amount%.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a float level gauge 10 with a contact according to the first embodiment. As shown in FIG. 1, a float level gauge with contacts (hereinafter, simply referred to as a level gauge) 10 is, for example, an LP such as a bulk storage tank which is a member to be attached.
A G container (hereinafter, simply referred to as a container) 1 is screwed and supported at an upper portion thereof, and a guide member 5 is inserted and fixed at a lower portion thereof into a guide cylinder 3 at a bottom portion of the container 1.

That is, the fixing member 2 is fixed to the center of the upper end plate 1A of the container 1, and inside the fixing member 2 is along the center line of the container 1 as shown in FIG. A female screw 2A is formed. The guide tube 3 having a predetermined inner diameter and height is fixed to the center of the lower end plate 1B of the container 1 with its center line along the center line of the container 1. The lower end plate 1B of such a container 1 is provided with a leg portion 4 for vertically standing the container 1.

As shown in FIG. 2, the liquid level gauge 10 includes a joint member 11 having a screw shaft portion 11A having a male screw 11C cut and a mounting portion 11B. The male screw 11C of the screw shaft portion 11A is fixed to the fixing member. It is adapted to be screwed into the female screw 2A of No. 2 and attached. Inside the screw shaft portion 11A,
A recess is formed along the axis and that houses the pressing member 32 and the like. On the other hand, a hexagon nut is formed on the outer periphery of the mounting portion 11B as shown in FIGS.

The coupling member 11 is fitted on the upper end of the mounting portion 11B and has a substantially cylindrical coupling 13 attached thereto by means of screws 12. The inner circumference of the coupling 13 has a substantially cylindrical reed switch. A mounting member 14 is provided. The reed switch mounting member 14 is provided with reed switches 15 arranged in the up-down direction (longitudinal direction) and formed of first and second reed switches 15A and 15B at predetermined intervals. The first and second reed switches 15A and 15B form a contact 20 with one magnet 24, which will be described later.
For example, A is provided at a position that indicates a remaining amount of 40%, and the second reed switch 15B is provided at a position that indicates a remaining amount of 20%, for example.

A liquid level indicating means 21 is provided at the upper edge of the inner circumference of the coupling 13, and the liquid level indicating means 21 is
A scale plate 16 having scales is provided. Further, the coupling 13 is formed with a cylindrical lead wire mounting portion 13A formed so as to project in the lateral direction, and a cable 19 is connected to the inside of the mounting portion 13A via a connecting device 18.
The cable 19 and the reed switch 15 are connected. For example, a buzzer is connected to the cable 19, and when the magnet 24 rotates to reach the position of the first reed switch 15A or the second reed switch 15B and the switch is input, the buzzer sounds. ing. The upper surface of the coupling 13 is covered with a transparent cover member 17 made of acrylic resin, for example, so that the scale plate 16 and the pointer 28 can be visually recognized.

A support pin 22 in which a seat plate and a pin are integrally formed is fixed to the inner center of the joint member 11, and an outer disk-shaped rotating member 23 is rotatably supported by the support pin 22. . At a predetermined position on the outer circumference of the rotating member 23, one magnet 24 that constitutes the contact 20 together with the reed switch 15 is provided. In addition, the rotating member 23
A ring-shaped magnet 25 is provided inside.

A pin portion projecting upward is provided on the upper surface of the rotary member 23, and a pointer shaft 26 is fitted into this pin portion. A magnet 27 is provided on the outer circumference of the pointer shaft 26, and a pointer 28 is attached to the upper end of the pointer shaft 26. A part of the magnet 27 is the scale plate 1
6 is inserted through the through hole at the center, and the pointer 28 is disposed above the scale plate 16. Therefore, with respect to the support pin 22, the rotating member 23, the magnet 24, the magnet 25, the pointer shaft 26, the magnet 27, and the pointer 2 are provided.
8 rotates integrally, and the movement of the pointer 28 can be seen from the outside of the transparent cover member 17. And here, the scale plate 1
6, the support pin 22, the rotating member 23, and the pointer shaft 26 constitute the liquid level indicating means 21.

A part of the pressing member 32 is inserted into the concave portion of the joint member 11, and the flange portion of the pressing member 32 is pressed against the lower end of the screw shaft portion 11A of the joint member 11 and screwed with the fixing bolt 33. The holding member 32 is attached.
An intermediate member 34 or the like is provided at the end of the pressing member 32 on the side of the concave portion, and a magnet mounting member 35 having a disk shape on the lower part of the cylinder is placed on the upper end of the intermediate member 34. A ring-shaped magnet 36 is provided on the magnet mounting member 35. This magnet 3
6 and the magnet 25 are formed to have substantially the same size, and the seat plate of the support pin 22 and the joint member 11 are formed.
Are arranged so as to face each other with a thick portion in the center of the inside sandwiched therebetween. Further, as the magnets 36 and 25, those having a magnetic force that can influence each other even if a seat plate or the like is sandwiched are used.

A female screw is cut at the center of the magnet mounting member 35, and a male screw cut at the tip of the rotary shaft 40 is screwed into this female screw. That is, the rotary shaft 40 is
As shown in FIG. 1, the container 1 is provided so as to extend downward and the upper end portion including the male screw portion is inserted into the set piece 29. The set piece 29 is housed in the inner diameter portion of the pressing member 32. A guide shaft 41 is screwed and fixed to the set piece 29 at a predetermined distance from the rotary shaft 40, and a stopper 30 made of a pipe member is covered on the upper end of the guide shaft 41. It is fixed to. The stopper 30 forms the upper limit position of the float 42 that is engaged with the rotation shaft 40 and moves along with the increase and decrease of the liquid inside the container 1.

The rotating shaft 40 has, for example, a lead portion formed in a spiral shape along the length direction, and the spiral of the lead portion has a starting point position to an end point position in the entire length of the rotating shaft 40. Up to the rotation angle of, for example, 270 ° to 300
It is formed so as to be within a range of about °, that is, within one rotation or less. Float 42
Is formed of styrofoam, a hollow member, or the like, and engages with the spiral of the lead portion of the rotating shaft 40 so as to be vertically movable. Therefore, when the float 42 moves up and down due to the displacement of the liquid inside the container 1, the rotation shaft 40
Rotates, and accordingly, the magnet mounting member 35 and the magnet 36 rotate. And this magnet 3
As the magnet 6 rotates, the magnet 25 provided on the coupling 13 rotates.

Next, the operation of such an embodiment will be described. First, the LPG transported by a bulk lorry or the like is placed in the container 1 having the contact-level liquid level gauge 10 attached thereto.
Fill through the inlet. When LPG is filled in the container 1, the liquid level of LPG gradually rises, and accordingly,
The float 42 moves upward due to buoyancy. The upward movement of the float 42 causes the rotary shaft 40 to rotate.

The rotation of the rotary shaft 40 causes the magnet 36 provided integrally with the rotary shaft 40 to rotate. As the magnet 36 rotates, the opposing magnet 25 also rotates. Then, the pointer 28, which is integrally connected to the magnet 25, rotates around a predetermined angle and indicates a predetermined numerical value.

The LPG in the container 1 is gradually lowered by use, and the rotating shaft 40 is rotated by a predetermined angle as the LPG is reduced.
Accordingly, the magnet 24 provided on the rotating member 23
Rotates. The magnet 24 is the first reed switch 1
When the position of 5A is reached, the first reed switch 15A is driven, and when the switch is turned on, for example, a buzzer sounds and informs that the remaining amount of LPG in the container 1 is 40%. As the LPG decreases, the rotating shaft 40 rotates due to the downward movement of the float 42, and the magnet 24
When the position of the second reed switch 15B is reached,
By driving the reed switch 15B and turning on the switch, for example, a buzzer sounds and notifies that the remaining amount of LPG in the container 1 is 20%.

According to the first embodiment as described above, the following effects can be obtained. (1) In the liquid level gauge 10 used for the vertical container 1, since the contact 20 is provided outside the container 1 and on the joint member 11 which is a member separate from the container 1, it is possible to input the switch. There is no danger of explosion. Therefore, since the liquid level gauge 10 does not have to have an explosion-proof structure, the structure is simple and the cost can be reduced.

(2) When the contact point 20 indicates the predetermined liquid surface position by the pointer 28 of the liquid surface indicating means 21, since the control contact output is transmitted to inform the liquid surface position, the vertical container 1 It is possible to easily detect the liquid level position such as the remaining amount of the internal liquid, and it is possible to take an early action such as arrangement of the replenishing liquid and prevention of overfilling. (3) Since the first and second reed switches 15A and 15B and the magnet 24 are provided on the side of the joint member 11 and the liquid level indicating means 21 which are indispensable for constructing the liquid level gauge 10, respectively. There is no need for a dedicated member for providing the two reed switches 15A and 15B and the magnet 24, and therefore the structure is simple.

(4) First and second reed switches 1
If the installation positions of 5A and 15B are made to correspond to the liquid positions to be known, such as the remaining amount of the liquid inside the container 1, for example, the remaining amounts of 40% and 20%, the first rotation of the magnet 24 causes
Since the second reed switches 15A and 15B are activated and transmit the control contact output, for example, the remaining amount is 40% and 20%.
It is possible to easily detect the liquid surface position such as, and to know the remaining amount and the like. As a result, the treatment can be performed early, such as preparation for replenishment of the internal liquid of the container 1.

Next, a second embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. In this embodiment, the same members as those used in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted or simplified. However, each member is different in the first embodiment and the second embodiment in that the attachment direction is the vertical direction and the horizontal direction.

The liquid level gauge with contacts 50 of the second embodiment is
It is provided in the horizontal type container 51. That is, as shown in FIG. 5, a fixing member 52 is fixed to the upper side surface of the container 51, and the liquid level gauge 50 is attached to the fixing member 52. As shown in FIG. 6, a rotary shaft 60 of the liquid level gauge 50 is provided inside a pipe member 67, and a rotary drive transmitting means 55 is provided at the tip of the pipe member 67, and the rotary drive transmitting means 55. A float 62 is connected to the shaft 62 via a support shaft 56.

The rotary drive transmission means 55 includes a first bevel gear (not shown) provided at one end of the support shaft 56, and a rotary shaft 60.
And a second bevel gear (not shown) that meshes with the first bevel gear and is provided at one end of the first bevel gear. And
When the float 62 moves vertically due to buoyancy as the LPG in the container 51 increases or decreases, the first bevel gear rotates and the second bevel gear also rotates, whereby the rotation shaft 62 is rotated.
Is designed to rotate. The center of the first bevel gear and the second bevel gear of the rotary drive transmission means 55 is the same as the radial center of the container 51. Also, the float 62
Is formed of, for example, a stainless oval shape.

The liquid level gauge 50, as shown in FIG.
1 is attached to the fixing member 52 with a fixing bolt 57. A holding member 72 is attached to the end of the joint 61 on the inner side of the container 51 with a fixing bolt 63, and a pipe member 67 is screwed and fixed to the center of the holding member 72 in the axial direction. A support ring 64 is provided so as to be sandwiched between it and the holding member 72. Further, inside the joint 61, a magnet mounting member 65 having one end abutting the support ring 64 and the other end mounted with the magnet 36 is provided.
A female screw is cut at the axial center of the magnet mounting member 65. The male screw of the rotary shaft 60 is screwed into the female screw, and the tip of the rotary shaft 60 is further inserted into the inner diameter of the support ring 64. .

Next, the operation of such an embodiment will be described. First, the container 51 to which the liquid level gauge 50 is attached is filled with LPG transported by a bulk lorry or the like via the LPG introduction port of the container 51. When LPG is filled in the container 51, the liquid level of LPG gradually rises, and accordingly,
The float 62 moves upward due to buoyancy. Due to the upward movement of the float 62, the rotation drive transmission means 55
The rotating shaft 60 rotates via the.

The rotation of the rotary shaft 60 causes the magnet 36 provided integrally with the rotary shaft 60 to rotate, and the magnets 25 facing each other rotate as the magnet 36 rotates. Then, the pointer 28, which is integrally connected to the magnet 25, rotates around a predetermined angle and indicates a predetermined numerical value.

The LPG in the container 51 is gradually lowered by use, and the rotating shaft 60 rotates by a predetermined angle as the LPG decreases, and the magnet 24 provided on the rotating member 23 rotates accordingly. The magnet 24 is the LP in the container 51.
First reed switch 1 driven when G has a remaining amount of 40%
When the position of 5A is reached, the magnet 24 drives the first reed switch 15A, and the switch is turned on.
For example, a buzzer sounds to indicate the remaining amount.

As the LPG decreases, the float 62
When the magnet 24 comes to the position of the second reed switch 15B driven when the remaining amount of LPG in the container 51 is 20%, the magnet 24 moves to the second reed switch. When 15B is driven and the switch is turned on, a buzzer sounds, for example, to notify the remaining amount.

According to the second embodiment as described above,
In addition to the same effects as (2) to (4), there are the following effects. (5) Float level gauge 60 with contacts in horizontal container 51
In the above, since the contact 20 is provided outside the container 51 and on the joint member 61 which is a member separate from the container 51,
There is no danger of explosion when the switch is pressed. Therefore,
Since the liquid level gauge 50 does not have to have an explosion-proof structure, the structure is simple and the cost can be reduced.

The present invention is not limited to the above-described embodiments, but may be modified as follows as long as the object of the present invention can be achieved. For example, in each of the above-described embodiments, the reed switch 15 forming the contact 20 is replaced by the first and second reed switches 15A,
Although it is formed of two 15B, the reed switch 15 may be formed of, for example, three or one. Further, in each of the above embodiments, the contact 20 is
Although the magnetic force type including the reed switch 15 and the magnet 24 is used, the present invention is not limited to this, and a type using an optical sensor, a type using a potentiometer, or the like may be used.

Furthermore, in each of the above embodiments, a buzzer is connected to the reed switch 15 which constitutes the contact 20, and the buzzer sounds when the liquid level reaches a predetermined position.
Although the liquid level position such as the remaining amount is notified, the present invention is not limited to this, and the pump for supplying the LPG to the containers 1 and 51 and the reed switch 15 are connected to each other so that the LPG is predetermined when the LPG is supplied. The pump may be stopped when the liquid level position is reached.

[0042]

As described above, according to the float level gauge with contacts of the present invention, in the float level gauge with contacts in a vertical or horizontal mounted member, the contact is outside the mounted member. In addition, since it is provided in the joint member which is a member different from the member to be attached, there is no danger of explosion due to switch input. Therefore, since the float level gauge with contacts does not have to be an explosion-proof structure, the structure is simple and the cost can be reduced. Also, when the contact point of the liquid level indicating means indicates a predetermined liquid level position, the control contact output is transmitted to inform the liquid level position.If the control contact output is connected to a buzzer, etc. By sounding the buzzer, it is possible to easily detect the liquid level position such as the amount of liquid remaining inside the vertical or horizontal mounted member, and to take early measures such as arrangement of replenishing liquid and prevention of overfilling. Can be taken.

[Brief description of drawings]

FIG. 1 is an overall view showing a state in which a float level gauge with contacts of a first embodiment according to the present invention is attached to a container.

FIG. 2 is a vertical cross-sectional view showing the structure of the float level gauge with contacts of the embodiment.

FIG. 3 is a perspective view showing a main part of the embodiment.

FIG. 4 is a view on arrow IV in FIG.

FIG. 5 is an overall view showing a state in which a float level gauge with contacts of a second embodiment according to the present invention is attached to a container.

FIG. 6 is a vertical sectional view showing the structure of a float level gauge with contacts according to the second embodiment.

FIG. 7 is a view on arrow VII in FIG.

[Explanation of symbols]

1,51 LPG container which is a member to be attached Float level gauge with 10,50 contacts 11,61 Joint member 15-contact reed switch 20 contacts 21 Liquid level indicator Magnet that composes 24 contacts 40,60 rotation axis 42,62 float

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2F013 AA05 AA06 AA07 BC02 CA08                       CA17 CB02                 3E072 AA01 CA03 DA02 GA30

Claims (4)

[Claims] 1. A rotary shaft that extends longitudinally of a member to be mounted vertically and is rotatably supported at both ends in the longitudinal direction so as not to be axially displaceable, and a liquid contained inside the member to be mounted. A float that moves back and forth along the rotation axis in accordance with the vertical displacement of the surface; and a liquid level indicating means that is associated with the rotation axis and that has a pointer that indicates the liquid level position according to the rotation of the rotation axis, And a contact for transmitting the predetermined control contact output to indicate the liquid level position when the pointer of the liquid level indicating means indicates a predetermined liquid level position, the contact being provided on the joint member. The float level gauge with contacts, wherein the joint member accommodates the liquid level indicating means and is detachably attached to the attached member. 2. A rotary shaft that is provided rotatably and is orthogonal to the longitudinal direction of a mounted member that is installed in a lateral direction, and is connected to the rotary shaft via a support shaft and is housed inside the mounted member. The float that moves according to the vertical displacement of the liquid level and the connecting portion between the rotation shaft and the support shaft, convert the vertical movement of the float into rotation of the rotation shaft, and rotate the rotation shaft. Rotation driving means, a liquid level indicating means that is related to the rotary shaft and indicates a liquid level position according to the rotation of the rotary shaft, and the pointer of the liquid level indicating means indicates a predetermined liquid level position. And a contact for notifying the liquid surface position by transmitting a predetermined control contact output, the contact being provided in a joint member, the joint member accommodating the liquid surface indicating means and being attached to the mounted member. Detachable to parts Contact with the float level gauge, characterized by being Attach. 3. The float level gauge with contacts according to claim 1, wherein the contact is a reed switch fixed to the joint member and a rotatable magnet provided on the liquid level indicating means side. A float level gauge with contacts, characterized by being composed of and. 4. The float level gauge with contacts according to claim 3, wherein the reed switches are provided at a plurality of locations.