KR102374977B1 - Liquid Level Measuring Apparatus With Built-in Alarm By Using LED-module - Google Patents

Abstract

Fluid level measuring device according to an embodiment of the present disclosure,
The body portion 1 having an open space formed at a predetermined position and provided with a coupling port on the upper surface of the open space; a fluid storage part having one side fitted to the coupling port (2); a float part (3) located inside the fluid storage part (2), moving in the vertical direction according to the flow of the fluid, and having a magnet therein; a pipe coupling part 4 having one side fitted to a lower portion of the fluid storage unit 2 and the other side connected to a pipe, and having a flow path therein; at least one alarm point unit 5 coupled to one side of the body unit 1; an alarm display unit (6) provided at a predetermined position of the body unit (1) and providing a visual notification according to the interaction between the float unit (3) and the alarm point unit (5); a power supply unit (7) provided to be replaceable inside the body unit (1) and supplying power for fluid level measurement; and a control unit 8 provided inside the body unit 1 to control the components; including,
The control unit 8 may include a light receiving module 8a to control power to be supplied by the power supply unit 7 when a light source is supplied to the light receiving module 8a.

Description

Fluid Level Measuring Device {Liquid Level Measuring Apparatus With Built-in Alarm By Using LED-module}

The present specification relates to a fluid level measuring device such as oil or lubricating oil, and more particularly, to a fluid level measuring device using a latching type reed switch that interacts with a magnet of a float part.

In general, lubricating oil must be properly supplied for smooth operation of industrial machinery, and the operation of checking lubricating oil is visually checked by the operator.

On the other hand, due to recent safety issues, a transparent wall is installed to prevent workers from approaching the machine facilities to keep them at a distance, making it more difficult to check the lubricant.

As a prior art, Korean Patent Publication No. 10-1997-0042116 discloses a level gauge inserted into a guide rod inside a tank and formed so that a cap coupled with a display unit moves up and down along the fluid surface, but the fluid display unit is installed inside the tank. It was configured so that it could be known through a transparent window, etc., so there was a problem that the operator had to check it from a short distance.

In addition, since the conventional case is not a latching type reed switch, there is a problem in that the operation of the reed switch is released when the reed switch interval is out of the magnetic field of the magnet in the float.

Accordingly, there is a need for a device capable of accurately checking the level of a fluid such as oil or lubricating oil from a distance by solving the above problems.

KR 1019970042116 A KR 100519138 B1 KR 1020180080249 A KR 1020180062462 A

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The fluid level measuring device according to an embodiment of the present disclosure is created to improve the problems of the prior art as described above, and is implemented wirelessly by applying a latching type reed switch, and minimizing current consumption using a low power device. It is an object of the present invention to provide a fluid level measuring device that can check the fluid level even from a long distance.

Fluid level measuring device according to the present disclosure for solving the above problems,

The body portion 1 having an open space formed at a predetermined position and provided with a coupling port on the upper surface of the open space; a fluid storage part having one side fitted to the coupling port (2); a float part (3) located inside the fluid storage part (2), moving in the vertical direction according to the flow of the fluid, and having a magnet therein; a pipe coupling part 4 having one side fitted to a lower portion of the fluid storage unit 2 and the other side connected to a pipe, and having a flow path therein; at least one alarm point unit 5 coupled to one side of the body unit 1; an alarm display unit (6) provided at a predetermined position of the body unit (1) and providing a visual notification according to the interaction between the float unit (3) and the alarm point unit (5); a power supply unit (7) provided to be replaceable inside the body unit (1) and supplying power for fluid level measurement; and a control unit 8 provided inside the body unit 1 to control the components; including,

The control unit 8 may include a light receiving module 8a to control power to be supplied by the power supply unit 7 when a light source is supplied to the light receiving module 8a.

In addition, the coupling port of the main body (1) may be configured to include a backlight module for illuminating the inside of the fluid storage unit (2) on the lower surface.

In addition, the alarm point unit 5 may be configured as a latching type reed switch is provided.

In addition, the alarm point unit 5 may be configured to be coupled to one side of the body unit 1 so as to be movable in the vertical direction.

In addition, the alarm point unit 5 may be configured to further include a fixing module to be fixed at a predetermined position.

In addition, the alarm display unit 6 includes at least one LED module,

The LED module may be configured such that at least one color is expressed.

In addition, by the alarm point unit 5, the fluid storage unit 2 is formed with LowLow, Low, and Normal sections at predetermined positions along the direction in which the fluid flows,

When the position of the float unit 3 is in the normal section of the fluid storage unit 2 and in a section other than the normal section, the control unit 8 signals the alarm display unit 6 to operate with different colors. It can be configured by sending

In addition, when the position of the float unit 3 is in the Low section of the fluid storage unit 2, the control unit 8 controls the alarm display unit 6 so that the LED module flashes once for a predetermined time interval. send a signal to

When the position of the float unit 3 is in the LowLow section of the fluid storage unit 2, the control unit 8 signals the alarm display unit 6 so that the LED module blinks twice during a predetermined time interval. It can be configured by sending

In addition, the fluid storage unit 2 further includes a High section at a predetermined position along the direction in which the fluid flows,

When the position of the float unit 3 is in the High section of the fluid storage unit 2, the control unit 8 signals the alarm display unit 6 so that the LED module flashes three times during a predetermined time interval. It can be configured by sending

In addition, the color expressed in the LED module, the blinking time interval, and the blinking frequency may be configured as changeable by the control unit 8 .

Accordingly, the fluid level measuring device according to the embodiment of the present disclosure,

The advantage of using a latching type reed switch is that the fluid level can be accurately measured even when the distance between the reed switches is far apart and out of the magnetic field of the magnet in the float.

There is an advantage of being implemented wirelessly using a low-power device.

In addition, there is an advantage that the fluid level can be checked even in the case of a non-transparent fluid.

In addition, there is an advantage that the fluid level can be intuitively checked even from a distance.

In addition, there is an advantage that the fluid level can be checked quickly and accurately even in the dark.

In addition, there is an advantage that it can be used for a long time by minimizing current consumption by using the standby mode.

1 is a configuration diagram schematically showing a fluid level measuring device according to an embodiment of the present disclosure;
2 is a configuration diagram schematically showing a fluid level measuring device according to an embodiment of the present disclosure;
3 is a view for specifically explaining a fluid level measuring device according to an embodiment of the present disclosure;
4 is a view for specifically explaining a fluid level measuring device according to an embodiment of the present disclosure;
5 is a flowchart illustrating a method for measuring a fluid level according to an embodiment of the present disclosure.

Hereinafter, the technical spirit of the present invention will be described with reference to the drawings, but this is for easier understanding, and the scope of the present invention is not limited thereto, and the present invention is only defined by the scope of the claims.

In the description of the embodiment of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted, and the same reference numerals refer to the same components throughout the specification. refers to the element.

1 is a configuration diagram schematically showing a fluid level measuring device according to an embodiment of the present disclosure, FIG. 2 is a configuration diagram schematically showing a fluid level measuring device according to an embodiment of the present disclosure, and FIG. 3 is an embodiment of the present disclosure Figure 4 is a view for specifically explaining a fluid level measuring apparatus according to an embodiment of the present disclosure, Figure 5 is a fluid level measuring method according to an embodiment of the present disclosure It is a flowchart to explain.

<Fluid level measuring device according to an embodiment of the present disclosure>

1 to 2 , the fluid level measuring device according to an embodiment of the present disclosure includes a body unit 1, a fluid storage unit 2, a float unit 3, a pipe coupling unit 4, and an alarm point unit. (5), the alarm display unit 6, the power supply unit 7, may be configured to include a control unit (8).

The main body 1 may have a structure in which a 'C'-shaped first frame and a second frame of a left-right symmetrical structure are coupled left and right to open a predetermined portion.

Sliding rails may be provided inside the side pillars of the first frame and the second frame so that an alarm point unit 5 to be described later is coupled to move up and down.

Meanwhile, a coupling port (not shown) for fitting one side of the fluid storage unit 2 to be described later may be provided on the upper surface of the open space of the main body 1 .

When a fluid storage unit 2 to be described later is fitted to the lower surface of the coupling port (not shown), a backlight module (not shown) for illuminating the inside of the fluid storage unit 2 may be included. there is.

The fluid storage unit 2 may be configured such that one side is fitted to the coupling port of the body unit 1 and the other side is fitted and fixed with a pipe coupling unit 4 to be described later. The fluid storage unit 2 is preferably configured in the form of a transparent material circular tube so that the user can visually check the liquid level, but is not limited thereto, and may be configured in various materials and shapes as needed. .

On the other hand, an air discharge valve (not shown) for discharging the internal air may be provided at a predetermined position on the upper portion of the fluid storage unit 2 , and further, into the fluid storage unit 2 . A fluid outlet (not shown) for discharging the introduced fluid may be provided at a predetermined position.

The float part 3 may be located inside the fluid storage part 2 and, when a fluid flows into the fluid storage part 2, may be configured to move up and down according to the flow of the fluid. A magnet interacting with an alarm point part 5 to be described later is provided at a predetermined position inside the float part 3 .

The pipe coupling unit 4 may be configured such that one side is fitted to the lower portion of the fluid storage unit 2 and the other side is connected to a pipe for measuring the fluid level. A flow path through which the fluid can move is formed inside the pipe coupling part 4 , and the fluid flows in through the flow path to move the fluid into the fluid storage unit 2 .

On the other hand, inside the pipe coupling part 4, a temperature sensing module (not shown) capable of detecting the temperature of the fluid, and a buzzer providing a notification to the user when the temperature is higher than a predetermined temperature based on the data of the temperature sensing module A module (not shown) may be further included.

The alarm point part 5 is coupled to one side of the body part 1 , and a reed switch may be provided therein to interact with the magnet of the float part 3 .

The alarm point part 5 may be configured to be movable up and down by being coupled to the sliding rail inside the side pillar of the body part 1 described above. The alarm point unit 5 may be configured to further include a fixing module (not shown) so as to be moved to a predetermined position and fixed to a predetermined position.

On the other hand, it is preferable to use a latching type reed switch as the reed switch. Accordingly, there is an advantage in that the fluid level can be accurately measured by solving the problem that the operation of the reed switch is released when the reed switch interval is out of the magnetic field of the magnet in the float part 3 because it is not a latching type in the prior art.

By the interaction between the alarm point unit 5 and the float unit 3, the fluid storage unit 2 may be formed in at least two or more sections in which level classification is possible.

Specifically, when the float part 3 is moved by the fluid flowing into the fluid storage part 2 , the permanent magnet inside the float part 3 and the lead inside the alarm point part 5 . The output resistance value may be changed by the interaction between the switches, and the fluid level section may be divided through the changed output resistance value.

The alarm display unit 6 may be provided at a predetermined position of the main body 1 , and may be configured to provide a visual notification according to the interaction between the float unit 3 and the alarm point unit 5 described above. The alarm display unit 6 may include at least one LED module, and the LED module may be configured to display at least one color.

The alarm display unit 6 may further include a lens cap (not shown) capable of diffusing light and preventing dust from entering.

The power supply unit 7 is provided to be replaceable inside the body unit 1, and may be configured to supply power for fluid level measurement. The power supply unit 7 is configured to be supplied with power by an external power line, and may be configured to be supplied with power through the battery by separately providing a battery, and the battery is detachably provided and charged separately. Or, it may be configured to be wirelessly charged in a mounted state.

The control unit 8 may be provided inside the main body 1 and be configured to control components for fluid level measurement. The control unit 8 may be configured to include a microcontroller unit (not shown) and a light receiving module 8a. The light receiving module 8a may further include a lens cap (not shown) capable of diffusing light and preventing dust from entering, similarly to the above-described alarm display unit 6 .

By using the microcontroller unit, the control unit 8 controls the alarm point unit 5 and the alarm display unit 6, and the power supply unit 7 is configured to supply power to the device according to the present disclosure. can be

The control unit 8 will be described in detail with reference to FIGS. 3 to 4 .

The control unit 8 may be configured to operate the alarm display unit 6 by sending different signals to the alarm display unit 6 according to the section in which the float unit 3 is located.

In the embodiment of the present disclosure, the fluid storage unit 2 by the alarm point unit 5 is described as including four sections of LowLow, Low, Normal, and High, but is not limited thereto and can be adjusted as needed. of course there is

The fluid storage unit 2 includes LowLow, Low, and Normal sections at predetermined positions along the direction in which the fluid flows, and the control unit 8 determines that the position of the float unit 3 is determined by the fluid storage unit 2 ) in the normal section and in the non-normal section, it can be configured to send a signal so that different colors are expressed.

For example, when the position of the float unit 3 is in the Normal section of the fluid storage unit 2 , the control unit 8 controls the alarm display unit so that green is displayed in the LED module of the alarm display unit 6 . (6) to send a signal, and when the position of the float unit 3 is in a section other than the Normal of the guide pipe 120, that is, LowLow, Low section, in the LED module of the alarm display section 6 The control unit 8 may be configured to send a signal to the alarm display unit 6 so that red is expressed.

Accordingly, when the fluid level is in the normal section and in the section other than the normal section, it will be possible to immediately distinguish it through the color expressed in the LED module of the alarm display unit 6 .

On the other hand, the LowLow section and the Low section cannot be distinguished through the color expressed on the LED module of the alarm display unit 6, so a method of distinguishing them is required. In the above, the LED module of the alarm display unit 6 may be configured to send a signal to the alarm display unit 6 so that the LED module blinks a different number of times during a predetermined time interval.

For example, when the position of the float unit 3 is in the Low section of the fluid storage unit 2, the control unit 8 is configured such that the LED module of the alarm display unit 6 blinks once every 4 seconds. When a signal is sent to the alarm display unit 6 and the position of the float unit 3 is in the LowLow section of the fluid storage unit 2, the LED module of the alarm display unit 6 blinks twice at a 4 second cycle. Preferably, the control unit 8 may be configured to send a signal to the alarm display unit 6 .

Additionally, the fluid storage unit 2 may further include a High section following the Normal section at a predetermined position along the direction in which the fluid flows, and the position of the float unit 3 is determined by the fluid storage section 2 . If it is in the High section, the control unit 8 may be configured to send a signal to the alarm display unit 6 so that the LED module blinks 3 times in a 4 second cycle.

3 (a) is a view showing a case in which the fluid level is in the High section. In this case, the control unit 8 controls the LED module of the alarm display unit 6 so that the red light flashes three times at a cycle of 4 seconds. It will send a signal to the alarm display (6).

3 (b) is a view showing a case in which the fluid level is in the Normal section. In this case, the control unit 8 controls the alarm display unit 6 so that the LED module of the alarm display unit 6 emits green light. will send a signal to

4 (a) is a view showing a case in which the fluid level is in the Low section. In this case, the control unit 8 controls the LED module of the alarm display unit 6 so that the red light blinks once every 4 seconds. It will send a signal to the alarm display (6).

4 (b) is a view showing a case in which the fluid level is in the LowLow section. In this case, the control unit 8 controls the LED module of the alarm display unit 6 so that the red light blinks twice at a cycle of 4 seconds. It will send a signal to the alarm display (6).

Additionally, by the alarm point unit 5, the fluid storage unit 2 may further include a HighHigh section following the High section at a predetermined position along the direction in which the fluid flows, and the float section 3 When the position is in the HighHigh section of the guide pipe 120 , the control unit 8 may be configured to send a signal to the alarm unit 300 so that the LED module flashes 4 times in a 4 second cycle.

On the other hand, the color expressed in the LED module of the alarm display unit 6, the blinking time interval, and the blinking frequency may be configured to be changeable by the control unit 8, thereby measuring the fluid level in various conditions and situations have the advantage of being able to

In addition, the control unit 8 may include a program for minimizing the use of power. Specifically, the control unit 8 controls the power supply unit 7 and when a predetermined time elapses, the power supply unit ( 7) may be configured to enter a standby mode that cuts off the power supplied by and turns off the LED module of the alarm display unit 6 to minimize power use.

To be a little more specific,

When the position of the float unit 3 is in the Normal section of the fluid storage unit 2, green light is continuously displayed on the LED module of the alarm display unit 6, and when a predetermined time has elapsed, the It may be configured to cut off the power supplied by the power supply unit 7 and enter the standby mode after turning off the LED module of the alarm display unit 6 .

When the position of the float unit 3 is in a section other than Normal of the fluid storage unit 2, the red light blinks at a predetermined time interval on the LED module of the alarm display unit 6, and the predetermined time elapses. In one case, the power supplied to the power supply unit 7 is cut off, and the LED module of the alarm display unit 6 is turned off and then is configured to enter the standby mode. In addition, in addition, every predetermined time interval After the standby mode is released to operate the alarm display unit 6, it may be configured to enter the standby mode again. This is to continuously provide an alarm to the inspector when the position of the float part 3 is in a section other than the normal of the guide pipe 120 .

In addition, the control unit 8 may further include a noise removal module (not shown) for removing noise from the fluid level measurement data.

The noise removal module samples the resistance value including noise at a predetermined time interval, compares the sampled resistance value with the resistance value sampled immediately before that, and after the difference between the values is within a predetermined range When the sampled voltage is adopted and the difference between the values is out of a predetermined range, the resistance value sampled immediately before is adopted and the control unit 8 controls the alarm display unit 6 based on the adopted resistance value. can be configured to control

For example, when the predetermined range is A, if the absolute value of the difference between the sampled resistance values is smaller than A, the resistance value sampled later is determined to be free of noise and adopted, and the difference between the sampled resistance values is determined If the absolute value of is greater than A, the resistance value sampled later is judged to contain noise and is not adopted, and the resistance value sampled before may be adopted, and this determination process may be configured to be repeated several times. There will be. Thereby, it will be possible to more precisely measure the fluid level by minimizing the malfunction.

On the other hand, the light receiving module 8a is connected to the control unit 8 to serve as a switch, and may include a light receiving lens, and when a light source is supplied to the light receiving module 8a, the control unit ( 8), the alarm display unit 6 may be configured to operate immediately.

Specifically, even when the control unit 8 is in the standby mode, when a light source is supplied to the light receiving module 8a, the control unit 8 immediately releases the standby mode and according to the fluid level, the alarm display unit ( 6) can be configured to operate, thereby minimizing power use and can be configured to immediately measure the fluid level when an inspection is required.

On the other hand, the control unit 8 may be configured to further include a communication module (not shown) capable of sending and receiving data, and when a light source is supplied to the light receiving module 8a, the control unit 8 is a fluid It may be configured to transmit level measurement related data to a separate server. These data may include not only fluid level measurement data, but also data required for overall monitoring, such as power supply-related data and light reception-related data.

In addition, the control unit 8 receives the fluid temperature data of the temperature sensing module of the pipe coupling unit 4, and based on this, when the temperature is higher than a predetermined temperature, the alarm display unit 6 or a separate buzzer module (not shown) ) can be configured to provide a notification through.

In addition, it may be configured to further include a power saving unit (not shown) for reducing power consumed in the fluid level measuring device according to the present disclosure.

The power saving unit includes a low-power power module circuit (not shown) supporting multiple voltages by passing power supplied from the power supply unit 7 through a voltage regulator (not shown), and the power module circuit includes the power supply unit ( 7) A separate MCU (not shown) that controls and controls, a DC/DC converter that converts the voltage supplied from the power supply unit 7 into DC voltages of 10V, 5V, 3.3V, etc. (not shown) , a control switch (not shown) for switching the voltage supplied from the power supply unit 7 may be configured.

Specifically, when the voltage supplied from the power supply unit 7 decreases, the power saving unit detects this in the MCU, and the MCU controls the voltage of the voltage regulator to a low voltage. For example, when the fluid level measuring device is operated at 10V and the voltage supplied from the power supply unit 7 is lowered, so that the power consumption is to be reduced, the power supply unit 7 is operated by the voltage regulator according to the command of the MCU. It will switch the supplied voltage to 3.3V.

In addition, the MCU has a built-in program to control the operating time of the fluid level measuring device by the MCU's self-timer, and to remotely monitor various data through the IoT network and to detect the presence or absence of an abnormality in the fluid level device. may be configured.

On the other hand, the MCU may include an error detection and correction function in order to prevent data errors of the fluid level measuring device, and the error correction is CRC. Turbocode algorithm may be applied. In addition, it may be possible to further improve security by applying a security algorithm related to data security.

Accordingly, the fluid level measuring device according to the embodiment of the present disclosure,

Using a latching type reed switch has the advantage of being able to accurately measure the fluid level even when the reed switch is far apart and out of the magnetic field of the magnet in the float, and it has the advantage of being implemented wirelessly using a low-power device.

In addition, there is an advantage that the fluid level can be checked even in the case of a non-transparent fluid, and there is an advantage that the fluid level can be intuitively checked even from a distance.

In addition, there is an advantage that the fluid level can be checked quickly and accurately even in a dark place, and it can be used for a long time by using the standby mode to minimize current consumption.

<Method for measuring fluid level according to an embodiment of the present disclosure>

Referring to Figure 5, the fluid level measuring method according to an embodiment of the present disclosure,

A first step of providing a light source to the light receiving module (8a);

a second step in which the standby mode of the control unit 8 is released;

a third step of recognizing the position of the float unit 3 by the fluid introduced into the fluid storage unit 2;

a fourth step in which the control unit 8 sends a signal to the alarm display unit 6 according to a predetermined section of the fluid storage unit 2 in which the float unit 3 is located;

a fifth step in which the alarm display unit 6 is operated;

a sixth step in which the control unit 8 enters the standby mode again after a predetermined time has elapsed; It may be configured as comprising a.

Although described above with reference to the drawings according to the embodiment of the present disclosure, it is possible for those of ordinary skill in the art to make various applications, modifications and adaptations within the scope of the present invention based on the above contents. will be.

1000: Fluid level measuring device according to an embodiment of the present disclosure
S1000: Fluid level measuring method according to an embodiment of the present disclosure
1: body part 2: fluid storage part
3: float part 4: pipe coupling part
5: alarm point unit 6: alarm display unit
7: power supply unit 8: control unit
8a: light receiving module

Claims (10)

The body portion 1 having an open space formed at a predetermined position and provided with a coupling port on the upper surface of the open space; a fluid storage part having one side fitted to the coupling port (2); a float part (3) located inside the fluid storage part (2), moving in the vertical direction according to the flow of the fluid, and having a magnet therein; a pipe coupling part 4 having one side fitted to a lower portion of the fluid storage unit 2 and the other side connected to a pipe, and having a flow path therein; at least one alarm point unit 5 coupled to one side of the body unit 1; an alarm display unit (6) provided at a predetermined position of the body unit (1) and providing a visual notification according to the interaction between the float unit (3) and the alarm point unit (5); a power supply unit (7) provided to be replaceable inside the body unit (1) and supplying power for fluid level measurement; and a control unit 8 provided inside the body unit 1 to control the components; including,
The coupling port of the main body (1) includes a backlight module for illuminating the inside of the fluid storage unit (2) on the lower surface,
The alarm point unit 5 is coupled to one side of the body unit 1 so as to be movable in the vertical direction, and further includes a fixing module configured to be fixed at a predetermined position,
The alarm display unit 6 includes at least one LED module, and the LED module is characterized in that at least one color is expressed,
The control unit 8 includes a light receiving module 8a, and when a light source is supplied to the light receiving module 8a, the power supply unit 7 controls power to be supplied,
When a predetermined time elapses by controlling the power supply unit 7, the control unit 8 cuts off the power supplied by the power supply unit 7 and enters a standby mode, but the light receiving module 8a) When the light source is supplied to the fluid level measuring device, characterized in that the standby mode is immediately released to operate the alarm display unit (6).
delete 2. The method of claim 1
The alarm point unit (5) is a fluid level measuring device, characterized in that provided with a latching type reed switch.
delete delete delete According to claim 1,
By the alarm point unit 5, the fluid storage unit 2 has LowLow, Low, Normal, and High sections formed at predetermined positions along the direction in which the fluid flows,
When the position of the float unit 3 is in a normal section of the fluid storage section 2 and in a section other than the normal section, the control section 8 signals the alarm display section 6 to operate with different colors. characterized by sending
When the position of the float unit 3 is in the Low section of the fluid storage unit 2, the control unit 8 signals the alarm display unit 6 so that the LED module blinks once for a predetermined time interval. characterized by sending
When the position of the float unit 3 is in the LowLow section of the fluid storage unit 2, the control unit 8 signals the alarm display unit 6 so that the LED module blinks twice during a predetermined time interval. characterized by sending
When the position of the float unit 3 is in the High section of the fluid storage unit 2, the control unit 8 signals the alarm display unit 6 so that the LED module flashes three times during a predetermined time interval. It is characterized by sending
The control unit 8 enters the standby mode after a predetermined time elapses, but when the position of the float unit 3 is in a section other than the Normal of the fluid storage unit 2, the standby mode is set at every predetermined time interval. A fluid level measuring device, characterized in that after releasing and operating the alarm display unit (6), it enters the standby mode again.
delete delete 8. The method of claim 7,
Fluid level measuring device, characterized in that the color expressed in the LED module, the blinking time interval, and the blinking frequency are changeable by the control unit (8).

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