KR101831964B1 - A method for detecting level of the fluid in the tank using a plurality of pcb pad - Google Patents

A method for detecting level of the fluid in the tank using a plurality of pcb pad Download PDF

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KR101831964B1
KR101831964B1 KR1020160027521A KR20160027521A KR101831964B1 KR 101831964 B1 KR101831964 B1 KR 101831964B1 KR 1020160027521 A KR1020160027521 A KR 1020160027521A KR 20160027521 A KR20160027521 A KR 20160027521A KR 101831964 B1 KR101831964 B1 KR 101831964B1
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pcb
fluid
level
tank
pads
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KR1020160027521A
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Korean (ko)
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KR20170104749A (en
Inventor
장석윤
서호철
장지상
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세종공업 주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/007—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring the level variations of storage tanks relative to the time
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H05K1/111—Pads for surface mounting, e.g. lay-out

Abstract

The present invention relates to a method for detecting the level of fluid in a tank using a plurality of PCB pads. According to the present invention, it is possible to quickly reflect the temperature change of the PCB pad due to the input of the fluid. That is, since the temperature of the PCB pad, which does not reach the level of the fluid, does not change and the area of each PCB pad is smaller than that of the prior art, the temperature of the PCB pad, The response speed of the water level sensing apparatus according to the present invention becomes faster. In addition, since it is possible to compare the capacitance difference between a PCB pad that does not reach the fluid level and a PCB pad that does not reach the fluid level by using several PCB pads, measurement error of the fluid level can be reduced. In addition, it is possible to improve the precision of the fluid level measurement in the water level sensing apparatus according to the present invention by removing the humidified state of the tank or noise due to waterdrops.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of detecting a level of fluid in a tank using a plurality of PCB pads,

The present invention relates to a method of detecting the level of fluid in a tank using a plurality of PCB pads, and more particularly, to a method and apparatus for detecting a level of fluid in a tank, The present invention relates to a method for detecting the level of a fluid in a tank using a plurality of PCB pads for preventing water level rise in the tank.

It is the level sensing device that is used when it is necessary to measure the level of liquids, liquid particles or powdered particles in industrial automation equipment or personal equipment. The level (level) measured by the level sensor means the position or height of the charged surface of the object to be measured, and is used to detect the height of the object filled in the tank. In other words, it is applied to the oil tank of an automobile and is used to measure the amount of oil to be charged.

Such a level sensing device may be classified into a float level sensing device, an electronic level sensing device, a radio wave level sensing device, or a capacitance level sensing device according to a driving method.

Among them, the capacitance level sensing device uses the electrostatic capacity which rises as the liquid, the powdery particles, etc. having a larger dielectric constant than the air rises and approaches the electrodes included in the level sensing device, (I.e., the water level).

Among them, unlike the float level sensing device, the electronic level sensing device, the radio wave level sensing device, and the like, the capacitance level sensing device is a method of measuring using the dielectric constant of the fluid, so that the dielectric constant of the fluid is an important factor for sensing.

More specifically, the principle of the capacitance level sensing device is shown in FIG. Further, it can be derived as the following equation (1). That is, the capacitance value is inversely proportional to the thickness of the tank in which the fluid is stored, and is proportional to the area and permittivity of the electrode (i.e., PCB pad) connected to the level sensor.

Figure 112016022227725-pat00001

(here,

Figure 112016022227725-pat00002
Is the capacitance measured on each PCB pad,
Figure 112016022227725-pat00003
Is the area of the PCB pad corresponding to the level of the fluid,
Figure 112016022227725-pat00004
Is the thickness of the tank in which the fluid is stored,
Figure 112016022227725-pat00005
Is the dielectric constant of the tank and is similar to the dielectric constant of air,
Figure 112016022227725-pat00006
Is the dielectric constant of the electrode)

That is, the capacitance level sensing device senses the level of the fluid in the tank by measuring the impedance change between the electrode connected to the level sensor and the tank. In other words, when the level of the fluid rises, the value of the capacitance rises, and when the value of the capacitance reaches a predetermined value, the level sensor detects the level of the fluid stored in the tank by outputting the level sensing signal.

Since the electrostatic capacity varies depending on the temperature of the electrode (i.e., the PCB pad), when a fluid having a temperature different from that of the PCB pad is input, the dielectric constant according to the temperature of the PCB pad must be corrected to accurately measure the fluid level. However, the conventional capacitive level sensing apparatus has only one level sensor. Accordingly, when a fluid having a temperature different from that of the PCB pad is input, the temperature change rate of the PCB pad is very slow, so that the level of the fluid can not be accurately measured.

(For example, when the PCB pad is at 100 degrees centigrade and the water of 10 degrees Celsius is supplied, the temperature of the PCB pad is gradually lowered at 100 degrees centigrade.) Therefore, , It is difficult to distinguish whether the change in capacitance measured on the PCB pad is due to the input of water or the temperature change of the PCB pad.

Further, there is a problem that it is difficult to distinguish the humidification state or noise due to water drops. That is, in the conventional capacitance level sensing apparatus having only one level sensor, the capacitances when the fluid level is low and when the entire PCB pad is exposed to the water droplet or humidified state are measured similarly. Therefore, there is a high possibility of malfunction when measuring the level of the fluid.

Japanese Patent Application Laid-Open No. 2007-298362 (November 15, 2007)

SUMMARY OF THE INVENTION It is an object of the present invention to dispose a plurality of PCB pads so that they are not separated from each other along the height direction of a tank T, Quickly reflects the change, and removes noise due to humidification or water droplets.

The apparatus for detecting the level of fluid in a tank using a plurality of PCB pads according to the present invention includes a PCB substrate 100 disposed vertically in a height direction of a tank T in which fluids are stored; And is disposed between the PCB substrate 100 and the tank T and mounted on the PCB substrate 100 so as not to be separated from each other along the height direction of the tank T,

Figure 112016022227725-pat00007
A plurality of (m) PCB pads 200 for measuring the number of PCB pads 200; And a table of permittivity of the PCB pad 200 according to temperature is stored,
Figure 112016022227725-pat00008
And a water level derivation unit 300 for deriving the level of the fluid stored in the tank T from the permittivity according to the temperature of the PCB pad 200.

The water level derivation unit 300 is connected to the plurality of PCB pads 200 through the PCB substrate 100.

The lower surface of the PCB pad disposed at the lowermost end of the plurality of PCB pads 200 is disposed at the same height as the lowermost level of the liquid level in the tank T. [

The upper surface of the PCB pad disposed at the uppermost one of the plurality of PCB pads 200 is disposed at the same height as the uppermost level of the level of the fluid in the tank T. [

The plurality of (m) PCB pads 200 are multiples of ten.

The PCB pad disposed at the lowermost one of the plurality of PCB pads 200 is a PCB pad 210 and the PCB pad disposed at the uppermost end is m PCB pads 2m0.

The height of the plurality of PCB pads 200 is all the same.

A method of sensing the level of fluid in a tank using a plurality of PCB pads according to the present invention includes the steps of: injecting fluid into a tank (T100); The capacitance of each of the plurality of PCB pads 200 (

Figure 112016022227725-pat00009
(S200); Deriving a permittivity of each of the PCB pads 200 from a permittivity table of pre-stored temperature-PCB pads (S300); The capacitance (
Figure 112016022227725-pat00010
Deriving the level of the fluid measured at each of the PCB pads 200 as a percentage of the height of the PCB pad 200 from the permittivity of each of the PCB pads 200 and the PCB pads 200 ); (S500) whether the level (%) of the fluid derived from all PCB pads (200) of the PCB pad (200) is less than a predetermined reference percentage (%); When any one of the water level (%) of the fluid derived from the PCB pad 200 exceeds the preset reference percentage (%), all PCB pads 200 of the PCB pads 200 (S600) of determining whether the level (%) of the fluid derived from the fluid reaches 100%; And when the water level of the fluid discharged from the PCB pad 200 does not reach 100% within a predetermined time, the water level of the fluid discharged from the PCB pad 200 is used , And deriving the level of the fluid with respect to the total height of the tank (S700).

When the level of the fluid drawn out from all the PCB pads 200 of the PCB pads 200 is less than a predetermined reference percentage (%), And a first malfunction determination step (S800) for determining that the water level sensing device is malfunctioning.

The water level sensing method may again perform the measuring step (S200) after the first malfunction determination step (S900).

When the water level (%) of the fluid discharged from all the PCB pads 200 of the PCB pads 200 reaches 100% within a predetermined time, the water level sensing method uses a plurality of PCB pads, And a second malfunction determination step (S900) of determining that the malfunction of the water level sensing device in step S900 is determined.

The water level sensing method may again perform the measuring step (S200) after the second malfunction determination step (S900).

The derivation step S700 may be performed in such a manner that the water level (%) of the last PCB pad (n-th PCB pad) at which the liquid level of the PCB pad 200 reaches 100% The level of the fluid relative to the total height of the tank T is derived using the level (x%) of the fluid derived from the first PCB pad (n + 1) .

The deriving step S700 is characterized by deriving the level of the fluid with respect to the entire height of the tank T by using the following equation.

Figure 112016022227725-pat00011

As described above, according to the present invention, it is possible to quickly reflect the temperature change of the PCB pad due to the input of the fluid. That is, since the temperature of the PCB pad, which does not reach the level of the fluid, does not change and the area of each PCB pad is smaller than that of the prior art, the temperature of the PCB pad, The response speed of the water level sensing apparatus according to the present invention becomes faster.

In addition, since it is possible to compare the capacitance difference between a PCB pad that does not reach the fluid level and a PCB pad that does not reach the fluid level by using several PCB pads, measurement error of the fluid level can be reduced.

In addition, it is possible to improve the precision of the fluid level measurement in the water level sensing apparatus according to the present invention by removing the humidified state of the tank or noise due to waterdrops.

1 is a view for explaining the principle of a capacitance level sensing apparatus;
2 is a schematic view of an apparatus for detecting the level of fluid in a tank using a plurality of PCB pads according to the present invention.
3 is a flowchart of a method of detecting the level of fluid in a tank using a plurality of PCB pads according to the present invention.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term in order to describe its invention in the best way And should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic view of an apparatus for detecting the level of fluid in a tank using a plurality of PCB pads according to the present invention. Referring to FIG. 2, an apparatus for detecting the level of fluid in a tank using a plurality of PCB pads according to the present invention includes a PCB substrate 100, a plurality of (m) PCB pads 200, a water level derivation unit 300, .

The PCB substrate 100 is disposed vertically in the height direction of the tank T in which the fluid is stored. A PCB pad 200 is disposed between the PCB substrate 100 and the tank T and mounted on the PCB substrate 100. At this time, the PCB pads 200 are disposed so as not to be separated from each other along the height direction of the tank T. At this time, the PCB pad 200 has a capacitance

Figure 112016022227725-pat00012
), And may be plural (m).

That is, the printed circuit board 100 is arranged vertically in the height direction of the tank T in which the fluid is stored, and the PCB pads 200 are closely arranged as described above, The height of the fluid can be measured more precisely.

At this time, the bottom surface of the PCB pad disposed at the lowermost one of the plurality of PCB pads 200 is disposed at the same height as the lowermost level of the fluid in the tank T, The upper surface of the PCB pad disposed in the tank T is disposed at the same height as the uppermost level of the level of the fluid in the tank T. Therefore, from the time when the tank T is empty, the level of the fluid can be precisely measured and derived until the tank T is filled with the fluid.

The plurality of (m) PCB pads 200 may be multiples of ten, and the PCB pads disposed at the lowermost one of the plurality of PCB pads 200 may be a PCB pad 210 The PCB pads can be m PCB pads (2m0). In addition, the height of the plurality of PCB pads 200 may all be set equal. This is to easily represent the level of the fluid relative to the height of the tank T in a specific method of deriving the level of the fluid stored in the tank T, which will be described later.

In order to derive the permittivity of each of the PCB pads 200 from the permittivity table of the PCB pad 200 of the PCB pads 200 to be described later, Equipment (temperature sensor, etc.) may be installed.

A table of permittivity of the PCB pad 200 according to temperature is stored in the water level derivation unit 300. Further, the water level derivation unit 300 calculates the water level

Figure 112016022227725-pat00013
And the dielectric constant of the PCB pad 200 according to the temperature of the PCB pad 200. The water level derivation unit 300 is connected to the plurality of PCB pads 200 through the PCB substrate 100 to detect the capacitance
Figure 112016022227725-pat00014
) ≪ / RTI >

That is, depending on the temperature of the PCB pad 200, the dielectric constant of the PCB pad 200 is changed, and accordingly, the capacitance measured at the PCB pad 200

Figure 112016022227725-pat00015
) Is also different. Accordingly, the water level derivation unit 300 calculates the water level
Figure 112016022227725-pat00016
) Using the dielectric constant of the PCB pad 200 according to the temperature of the PCB pad 200,
Figure 112016022227725-pat00017
(The area of the PCB pad corresponding to the level of the fluid). In addition,
Figure 112016022227725-pat00018
(The width of the PCB pad is a predetermined value and can be easily confirmed).

At this time, the temperature of the PCB pad 200 is stored in the water level deriving unit 300, and the dielectric constant of the PCB pad 200 is determined based on the temperature of the PCB pad 200, The table can be a value derived by experiment.

A specific method of deriving the level of the fluid stored in the tank T in the water level derivation unit 300 will be described later.

3 is a flowchart of a method of detecting the level of fluid in a tank using a plurality of PCB pads according to the present invention. Referring to FIG. 3, a method of detecting the level of fluid in a tank using a plurality of PCB pads according to the present invention includes the steps of injecting a fluid into a tank T (S100) Capacitance (

Figure 112016022227725-pat00019
A step S300 of deriving the permittivity of each of the PCB pads 200, a step of deriving the fluid level as a percentage of the height of the PCB pads 200 (S400), determining whether the level of the fluid is less than a predetermined reference percentage (S500), determining whether the level of the fluid derived from all the PCB pads (200) reaches 100% (S700), a first malfunction determination step (S800), and a second malfunction determination step (S900), in order to determine the level of the fluid relative to the entire height of the tank (T).

Hereinafter, a method of detecting the level of fluid in a tank using a plurality of PCB pads according to the present invention will be described in detail. First, a fluid is injected into the tank T (S100), and capacitance of each of the plurality of PCB pads 200

Figure 112016022227725-pat00020
(S200). For example, the number m of PCB pads 200 may be ten.

Then, the permittivity of each of the PCB pads 200 is derived from the temperature of the pre-stored PCB pads - the permittivity table of the PCB pads (S300). The permittivity table of the PCB pad 200 is stored in the water level deriving unit 300 and the permittivity table of the PCB pad 200 is a table of the permittivity table derived from the experiment Lt; / RTI >

In order to derive the permittivity of each of the PCB pads 200 from the permittivity table of the PCB-pads 200, a separate device for sensing the temperature of each of the PCB pads 200 (Temperature sensor, etc.) may be mounted on the PCB pad 200, and the temperature of each of the PCB pads 200 is sensed from the separate equipment to derive the dielectric constant of the corresponding PCB pad 200.

Then, the capacitance (

Figure 112016022227725-pat00021
And the water level of the fluid measured at each of the PCB pads 200 is derived from the permittivity of each of the PCB pads 200 at step S400. In more detail, referring to Equation (1) above, the capacitance
Figure 112016022227725-pat00022
) And the permittivity of each of the PCB pads 200 (
Figure 112016022227725-pat00023
), And the thickness of the tank in which the fluid is stored
Figure 112016022227725-pat00024
) And the dielectric constant of the tank (
Figure 112016022227725-pat00025
) Is also a constant value that can be identified, so the area of the PCB pad corresponding to the fluid level
Figure 112016022227725-pat00026
Can easily be derived. Further, since the width of the PCB pad is a predetermined value and can be easily confirmed,
Figure 112016022227725-pat00027
It is possible to derive the fluid level from the fluid.

Then, the level of the fluid is derived as a percentage (%) with respect to the height of the PCB pad 200 (S400). That is, the water level of the fluid is divided by the height of each of the PCB pads 200 and then multiplied by 100 to represent the water level as a percentage (%). This is to easily derive the level of the fluid in the step S700 of deriving the level of the fluid with respect to the total height of the tank T. [

Then, it is determined whether the level of the fluid drawn out from all the PCB pads 200 of the PCB pads 200 is less than a predetermined reference percentage (S500). The predetermined reference percentage (%) may be 30%, but is not limited thereto and may be set differently depending on the designer's intention and the like.

This is because the electrostatic capacity values measured at all the PCB pads 200 (and the level (%) of the fluid derived therefrom) change but do not exceed the predetermined reference percentage (%), This is because there is a high possibility of noise.

That is, when noise due to water droplets or humidification occurs, the liquid level (%) derived from all the PCB pads 200 has a value similar to each other and can not reach 100%.

Accordingly, when the level of the fluid derived from all the PCB pads 200 of the PCB pads 200 is less than a predetermined reference percentage (%), the level of the fluid in the tank using the plurality of PCB pads It is judged as a malfunction (S800), and the measuring step S200 is performed again.

When any one of the level of the fluid discharged from the PCB pad 200 exceeds the predetermined reference percentage, the PCB pad 200 of the PCB pad 200 is discharged within a predetermined time, And determines whether the level of the fluid derived from the fluid reaches 100% (S600).

This is to eliminate the noise generated when the PCB pad 200 is exposed to EMC (Electro-Magnetic Compatibility). That is, when the fluid is input, the level of the fluid must be sequentially derived from the first PCB pad 210 disposed at the lowermost one of the PCB pads 200 to 100%. However, when exposed to EMC (Electro-Magnetic Compatibility), the capacitance measured at all the PCB pads 200 of the PCB pads 200 changes at the same time, The water level becomes 100%. Therefore, in order to exclude such noise, step S600 is performed.

Therefore, when the level of the fluid drawn out from all the PCB pads 200 of the PCB pads 200 reaches 100% within a predetermined time, the malfunction of the level sensor of the fluid in the tank using the plurality of PCB pads (S900), and performs the measurement (S200) again.

If the water level of the fluid discharged from the PCB pad 200 does not reach 100% within a predetermined time, the water level of the fluid discharged from the PCB pad 200 The level of the fluid relative to the total height of the tank T is derived (S700).

More specifically, the deriving step (S700) may include a step of determining whether the level of the fluid in the PCB pad 200 reaches 100% of the last PCB pad (n-th PCB pad) (X%) of the fluid derived from the first PCB pad (n + 1 PCB pads) which is not the first PCB pad is substituted into the following equation (2) to derive the level of the fluid with respect to the total height of the tank .

Figure 112016022227725-pat00028

For example, if the number of PCB pads 200 is 10, the level of the fluid reaches 100% (n = 3) to the PCB pad 3, and the fluid level at the 4th PCB pad is 50% (X = 50), the level of the fluid relative to the total height of the tank T is 35%.

That is, in the present invention, the printed circuit board 100 is disposed vertically in the height direction of the tank T in which the fluid is stored, and the PCB pad 200 is closely arranged as described above, The level of the fluid relative to the entire height of the fluid can be easily obtained.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, as claimed, and will be fully understood by those of ordinary skill in the art. The present invention is not limited thereto. It will be apparent to those skilled in the art that various substitutions, modifications and variations are possible within the scope of the present invention, and it is obvious that those parts easily changeable by those skilled in the art are included in the scope of the present invention .

100 PCB board
200 PCB Pads
210 1st PCB Pad
...
PCB pad 2m0 m times
300 water level deriving part
T tank

Claims (7)

Injecting fluid into the interior of the tank T (S100);
The capacitance of each of the plurality of PCB pads 200 (
Figure 112016022227725-pat00029
(S200);
Deriving a permittivity of each of the PCB pads 200 from a permittivity table of pre-stored temperature-PCB pads (S300);
The capacitance (
Figure 112016022227725-pat00030
Deriving the level of the fluid measured at each of the PCB pads 200 as a percentage of the height of the PCB pad 200 from the permittivity of each of the PCB pads 200 and the PCB pads 200 );
(S500) whether the level (%) of the fluid derived from all PCB pads (200) of the PCB pad (200) is less than a predetermined reference percentage (%);
When any one of the water level (%) of the fluid derived from the PCB pad 200 exceeds the preset reference percentage (%), all PCB pads 200 of the PCB pads 200 (S600) of determining whether the level (%) of the fluid derived from the fluid reaches 100%; And
When the water level of the fluid drawn out from the PCB pad 200 does not reach 100% within a predetermined time, the water level of the fluid drawn from the PCB pad 200 is used, Deriving the level of the fluid relative to the total height of the tank (S700);
And a plurality of PCB pads including the plurality of PCB pads. The method according to claim 1,
When the level of the fluid drawn from all the PCB pads 200 of the PCB pads 200 is less than a preset reference percentage (%), the malfunction of the level sensing device of the fluid in the tank using the plurality of PCB pads A first malfunction determination step S800;
Wherein the plurality of PCB pads are used to detect the level of fluid in the tank. 3. The method of claim 2,
Wherein the measuring step S200 is performed again after the first malfunction determination step S900 is performed. The method according to claim 1,
When the level of the fluid drawn out from all the PCB pads 200 of the PCB pads 200 reaches 100% within a predetermined time, the water level of the fluid in the tank using the plurality of PCB pads A second malfunction determination step (S900) of judging malfunction;
Wherein the plurality of PCB pads are used to detect the level of fluid in the tank. 5. The method of claim 4,
Wherein the measuring step (S200) is performed again after the second malfunction determination step (S900). The method according to claim 1,
The derivation step S700 may be performed in such a manner that the water level (%) of the last PCB pad (n-th PCB pad) at which the liquid level of the PCB pad 200 reaches 100% (X%) of the fluid derived from the first PCB pad (n + 1), which is not the first PCB pad (n + 1), is used to derive the level of the fluid relative to the total height of the tank A method for detecting the level of fluid in a tank using a plurality of PCB pads. The method according to claim 6,
The deriving step S700 derives the level of the fluid with respect to the entire height of the tank T using the following equation: < EMI ID = 1.0 > Way.
Figure 112016022227725-pat00031
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KR102632463B1 (en) 2023-09-19 2024-02-02 주식회사 이도 Urban flooding monitoring system
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