KR101816788B1 - System for inspecting leakage of fueltank - Google Patents

System for inspecting leakage of fueltank Download PDF

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Publication number
KR101816788B1
KR101816788B1 KR1020150184595A KR20150184595A KR101816788B1 KR 101816788 B1 KR101816788 B1 KR 101816788B1 KR 1020150184595 A KR1020150184595 A KR 1020150184595A KR 20150184595 A KR20150184595 A KR 20150184595A KR 101816788 B1 KR101816788 B1 KR 101816788B1
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KR
South Korea
Prior art keywords
fuel tank
test gas
test
valve
vacuum pump
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KR1020150184595A
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Korean (ko)
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KR20170075827A (en
Inventor
최난웅
김세준
이승호
백명훈
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(주)동희산업
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Priority to KR1020150184595A priority Critical patent/KR101816788B1/en
Publication of KR20170075827A publication Critical patent/KR20170075827A/en
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Publication of KR101816788B1 publication Critical patent/KR101816788B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum
    • F04B37/16—Means for nullifying unswept space
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/223—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for pipe joints or seals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • G01M3/229—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators removably mounted in a test cell
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air

Abstract

A test chamber having a built-in space in which a fuel tank is embedded; A plurality of sealing pipes provided in a built-in space of the test chamber and each closely surrounding the plurality of connector joint portions of the fuel tank; A test gas analyzer provided outside the test chamber, a plurality of transfer lines connecting the test gas analyzer and the respective sealing pipes, and a plurality of valves provided for each of the plurality of transfer lines; An inner vacuum pump and a test gas tank provided outside the test chamber and communicating with the interior of the built-in fuel tank and forming the interior of the fuel tank in a vacuum state or injecting the test gas into the interior of the fuel tank; And the internal vacuum pump is controlled during the leak test to form a vacuum inside the fuel tank. The test gas tank is controlled to inject the test gas into the fuel tank. The valve is selectively opened and controlled. The test gas analyzer And a controller for detecting a connector coupling portion where leak is generated by detecting the leakage of the gas.

Description

{SYSTEM FOR INSPECTING LEAKAGE OF FUELTANK}

The present invention relates to a fuel tank leakage inspection system and an inspection method which are capable of inspecting leaks due to manufacturing errors or design errors around fused portions and connector joint portions of fuel tanks.

In the case of a fuel tank, it can be made of steel or plastic, and it is usually manufactured by separately fabricating the upper and lower parts and welding them together.

Various types of connectors for fuel transfer and fuel gas discharge are connected to the fuel tank, and these connectors are generally assembled together when manufacturing the fuel tank.

In the fuel tank manufactured as described above, if a minute manufacturing error occurs in the fused portion and the connector-coupled portion, there is a possibility that the fuel inside the fuel tank is leaked at the time of subsequent use, which is not very safe and environmentally friendly.

Therefore, when the fuel tank is put into a separate sealed chamber to perform the leak test, if the fuel tank is simply inserted into the chamber and the special test gas is injected to judge the leak, the leakage is detected. I can not tell if there is a defect and leak.

Therefore, in conducting the leak inspection, it is necessary not only to judge whether the product is defective or not, but also to be able to precisely detect the error in any part.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-2007-0061698 A

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such problems, and it is an object of the present invention to provide a fuel tank leakage inspection system and an inspection method for inspecting leaks due to manufacturing errors or design errors around fused portions of fuel tanks and connector- to be.

According to an aspect of the present invention, there is provided a fuel tank leak inspection system including: a test chamber having a built-in space in which a fuel tank is installed; A plurality of sealing pipes provided in a built-in space of the test chamber and each closely surrounding the plurality of connector joint portions of the fuel tank; A test gas analyzer provided outside the test chamber, a plurality of transfer lines connecting the test gas analyzer and the respective sealing pipes, and a plurality of valves provided for each of the plurality of transfer lines; An inner vacuum pump and a test gas tank provided outside the test chamber and communicating with the interior of the built-in fuel tank and forming the interior of the fuel tank in a vacuum state or injecting the test gas into the interior of the fuel tank; And the internal vacuum pump is controlled during the leak test to form a vacuum inside the fuel tank. The test gas tank is controlled to inject the test gas into the fuel tank. The valve is selectively opened and controlled. The test gas analyzer And a controller for detecting a connector coupling portion where leak is generated by detecting leakage of the gas.

The internal space of the test chamber is connected to the test gas analyzer as a check line, the valve is provided in the check line, and the control unit can detect the leakage of the upper and lower fuselage of the fuel tank through the test gas analyzer when the valve on the check line is open- have.

And an external vacuum pump provided outside the test chamber and connected to the transfer line and the check line to form a space between the exterior of the fuel tank and the built-in space in a vacuum and to form a transfer line, a check line, .

The control unit opens both the transfer line and the check line valve at the time of the leak inspection and controls both the inner vacuum pump and the outer vacuum pump to form both the inside and the outside of the fuel tank in a vacuum and close both the transfer line and the check line valve Test gas can be injected into the fuel tank by controlling the gas tank.

In the checking of the leakage by selectively opening each valve, the control unit can open the valve after inspecting the leakage by forming a vacuum state through the external vacuum pump before opening each valve.

A method for inspecting a fuel tank leak using a fuel tank leakage inspection system of the present invention comprises the steps of: forming an interior of a fuel tank through an inner vacuum pump in a vacuum; Injecting a test gas into the fuel tank by controlling the test gas tank; And detecting the connector engagement where leaks occur by selectively opening each valve and detecting leakage of the test gas to the test gas analyzer.

Another fuel tank leakage inspection method using the fuel tank leakage inspection system of the present invention comprises the steps of: forming an interior of a fuel tank in a vacuum through an internal vacuum pump; Forming the outside of the fuel tank through the outer vacuum pump in a vacuum; Injecting a test gas into the fuel tank by controlling the test gas tank; And detecting the connector engagement where leaks occur by selectively opening each valve and detecting leakage of the test gas to the test gas analyzer.

According to the fuel tank leakage inspection system and inspection method of the present invention, it is possible to check leakage due to manufacturing errors or design errors around the fused portion and the connector engagement portion of the fuel tank.

Particularly, it is very effective in inspecting and re-manufacturing the fuel tank in that it is possible to specifically understand which of the plurality of engaging portions has an error and to improve only the relevant portion to prevent leakage.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a view of a fuel tank leak inspection system in accordance with an embodiment of the present invention.
2 is a view showing the inside of a chamber of a fuel tank leak inspection system according to an embodiment of the present invention.
3 to 4 are flowcharts of a fuel tank leak inspection method according to an embodiment of the present invention.

FIG. 1 is a view showing a fuel tank leak inspection system according to an embodiment of the present invention, FIG. 2 is a view showing the inside of a chamber of a fuel tank leak inspection system according to an embodiment of the present invention, A flowchart of a fuel tank leak inspection method according to an embodiment of the present invention.

The fuel tank leakage inspection system according to the present invention includes: a test chamber 100 having a built-in space 120 in which a fuel tank 300 is embedded; A plurality of sealing pipes 401, 403 and 404 provided in the built-in space 120 of the test chamber 100 and closely attached to the periphery of the plurality of connector fittings 301, 303 and 304 of the fuel tank 300; A test gas analyzer 702 provided outside the test chamber 100, a plurality of transfer lines 500 connecting the test gas analyzer 702 and each of the sealing pipes 401, 403 and 404, and a plurality of transfer lines 500 provided for each of the plurality of transfer lines 500 The valve 600 of FIG. The test chamber 300 is provided outside the test chamber 100 and communicates with the interior of the fuel tank 300 to form the inside of the fuel tank 300 in a vacuum state or to inject the test gas into the inside of the fuel tank 300 A pump 703 and a test gas tank 704; The internal vacuum pump 703 is controlled to form the inside of the fuel tank 300 in a vacuum and the test gas tank 704 is controlled to inject the test gas into the fuel tank 300, And a control unit for selectively detecting the leakage of the test gas by the test gas analyzer 702 to detect the connector connectors 301, 303, and 304 that are leaked.

The test chamber 100 is sealed with the outside, and a built-in space 120 is formed in the inside of the test chamber 100, and a fuel tank 300 to be subjected to a leak test is built in the built-in space. The test chamber 100 is provided with a plurality of sealing pipes 401, 403, and 404. The sealing pipes 401, 403 and 404 are made extendable / contractible by the cylinder.

The sealing pipes 401, 403 and 404 are provided in the interior space of the test chamber 100 and are in close contact with the periphery of the plurality of connector fittings 301, 303 and 304 of the fuel tank 300, respectively. In the illustrated embodiment, the fuel tank 300 is composed of a fuel pump connector connector 303, a filler neck connector connector 301, and a leveling pipe connector connector 304, and each of the connector connectors 301, 303, The sealing pipes 401, 403, and 404 are extended to come in close contact with the peripheral portions of the connector connectors 301, 303, and 304 of the fuel tank 300, respectively. Since the sealing pipes 401, 403 and 404 are in close contact with the connector fitting portions 301, 303 and 304, only the leakage of the corresponding connector fitting portions 301, 303 and 304 can be discriminated without any further influences.

A test gas analyzer 702 provided outside the test chamber 100, a plurality of transfer lines 500 connecting the test gas analyzer 702 and each of the sealing pipes 401, 403 and 404 and a plurality of transfer lines 500 provided for each of the plurality of transfer lines 500 A plurality of valves 600 are provided. A test gas analyzer 702 is provided outside the test chamber 100 and the test gas analyzer 702 is connected to the sealing pipes 401, 403 and 404 through the transfer line 500, respectively. A valve 600 is provided in each transfer line 500.

The inner vacuum pump 703 is provided outside the test chamber 100 and communicates with the interior of the built-in fuel tank 300 to form the inside of the fuel tank 300 in a vacuum state. The test gas tank 704 is provided outside the test chamber 100 and communicates with the interior of the built-in fuel tank 300 and injects the test gas into the fuel tank 300. The internal vacuum pump 703 and the test gas tank 704 may be connected to the internal fuel tank 300 through a test chamber 100 in a separate line and may include a valve.

Then, the controller performs the leak test. The control unit first controls the inner vacuum pump 703 at the start of the leak inspection to form the inside of the fuel tank 300 in a vacuum. Then, the test gas tank 704 is controlled to inject the test gas into the fuel tank 300 formed in a vacuum. When the valve 600 is opened, the test gas analyzer 702 detects the leakage of the test gas to thereby detect the leakage of the specific connector coupling portions 301, 303, and 304 ) Of the user. That is, for example, when inspection of the fuel pump connector engagement portion 303 is required, only the valve 603 on the transfer line 503 is opened and all the remaining valves 601, 602, and 604 are closed. Then, the test gas analyzer 702 performs the test gas detection, and if the test gas is detected, the test gas filled in the fuel tank, which is detected by the sealing pipe 403 of the relevant portion, 303, < / RTI >

When the above process is performed for each of the connector connectors 301, 303, and 304, it is possible to determine what kind of leakage occurs in the coupling part. As a result, only the corresponding part is replaced or repaired, And it is possible to correct the error more quickly by designing only the connector of the corresponding part again.

On the other hand, the built-in space 120 of the test chamber 100 is connected to the test gas analyzer 702 by a check line C, the valve 602 is provided to the check line C, When the valve 602 is open-controlled, leak of the upper and lower fused portions of the fuel tank 300 can be detected through the test gas analyzer 702. That is, an opening is formed in the inner surface of the test chamber 100 and is connected to the test gas analyzer 702 by a separate check line (C). The fuel tank 300 is generally formed by separately molding the upper and lower parts and joining together the edges of the fuel tank 300 to obtain a sealed tank shape. In order to check the fuel tank 300 separately, leakage may occur at the fusion point to be. Accordingly, it is possible to check the leakage of the fused portion together with the connector engaging portions 301, 303, and 304 by inspecting the leak and selectively opening the valve 602 on the check line C as with the other valves 601, 603 and 604.

An external vacuum pump 701 is provided outside the test chamber 100 and an external vacuum pump 701 is connected to the transfer line 500 and the check line C to provide a space between the exterior of the fuel tank and the built- And the inside of the transfer line 500, the check line C, and the sealing pipes 401, 403 and 404 is vacuum-formed. As a result, the inside of the fuel tank 300 before the test as well as the outside can be formed into a vacuum. Particularly, by evacuating the vicinity of the fused portion and the various connector connecting portions, It is possible to solve the detection error caused by the error.

The control unit opens both the transfer line 500 and the valve 600 of the check line C and controls the inner vacuum pump 703 and the outer vacuum pump 701 to check the inside of the fuel tank 300 And the test gas tank 704 is controlled to inject the test gas into the fuel tank 300 by closing both the transfer line 500 and the valve 600 of the check line C .

Meanwhile, in checking the leakage by selectively opening each valve 600, the control unit forms a vacuum state through the external vacuum pump 701 before opening each valve 600, . ≪ / RTI > That is, after diagnosing the leak of the fuel pump connector connector 303, all the valves 600 are opened and then the vacuum state of all the lines is again formed through the external vacuum pump 701, Only the valve 602 of the check line C is opened to check the leak of the fused portion. Through this process, it is possible to check more precisely during the inspection of each step and to minimize the influence on each other during the inspection step.

3 is a flow chart of a fuel tank leak inspection method according to an embodiment of the present invention. In the fuel tank leak inspection method using the fuel tank leak inspection system of the present invention, the inside of the fuel tank is evacuated through an inner vacuum pump ; Injecting a test gas into the fuel tank by controlling the test gas tank; And detecting the connector engagement where leaks occur by selectively opening each valve and detecting leakage of the test gas to the test gas analyzer.

In another aspect of the present invention, there is provided a fuel tank leak inspection method using a fuel tank leak inspection system, comprising the steps of: forming an interior of a fuel tank in a vacuum through an internal vacuum pump; Forming the outside of the fuel tank through the outer vacuum pump in a vacuum; Injecting a test gas into the fuel tank by controlling the test gas tank; And detecting the connector engagement where leaks occur by selectively opening each valve and detecting leakage of the test gas to the test gas analyzer.

The inspection method will be described with reference to the drawings. First, the fuel tank is installed in the test chamber. And the test chamber is sealed.

Then, each sealing pipe is tightly attached to the connector coupling portion through the cylinder extension. Then, the entire valve is opened and the outer vacuum pump is activated to vacuum the test chamber, the sealing pipe, and the transfer line. Further, the inner vacuum pump is operated to form the inside of the fuel tank in a vacuum. This completes the test preparation.

Then, helium gas is injected into the fuel tank from the external test gas tank.

In this state, all of the test gas is filled in the fuel tank. In this state, the valve of the coupling part of the filler neck connector is opened and checked for leaks. After the check, the valve is closed and only the other valve is opened so that the fused portion and all the connector engagement portions are sequentially checked in this order.

After all checks have been completed, return the test chamber and fuel tank to atmospheric pressure and withdraw the fuel tank to repair or replace any leaking parts or to supplement the design itself.

According to the fuel tank leakage inspection system and inspection method of the present invention, it is possible to check leakage due to manufacturing errors or design errors around the fused portion and the connector engagement portion of the fuel tank.

Particularly, it is very effective in inspecting and re-manufacturing the fuel tank in that it is possible to specifically understand which of the plurality of engaging portions has an error and to improve only the relevant portion to prevent leakage.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

100: Test chamber 300: Fuel tank
500: transfer line 600: valve
701: outer vacuum pump 703: inner vacuum pump

Claims (7)

A test chamber having a built-in space in which a fuel tank is embedded;
A plurality of sealing pipes provided in a built-in space of the test chamber and each closely surrounding the plurality of connector joint portions of the fuel tank;
A test gas analyzer provided outside the test chamber, a plurality of transfer lines connecting the test gas analyzer and each of the sealing pipes, and a plurality of valves provided for each of the plurality of transfer lines;
An inner vacuum pump and a test gas tank provided outside the test chamber and communicating with the interior of the built-in fuel tank and forming the interior of the fuel tank in a vacuum state or injecting the test gas into the interior of the fuel tank; And
When the leak test is performed, the inner vacuum pump is controlled to form a vacuum inside the fuel tank. The test gas tank is controlled to inject the test gas into the fuel tank. The valves are selectively opened and controlled. The test gas analyzer And a controller for detecting a connector coupling portion where leakage occurs by detecting leakage of the connector connector,
The internal space of the test chamber is connected to the test gas analyzer by a check line, the valve is provided on the check line,
And an external vacuum pump provided outside the test chamber and connected to the transfer line and the check line to form a space between the outside of the fuel tank and the built-in space in a vacuum and to form a transfer line, a check line, Wherein the fuel tank leakage inspection system is characterized in that the fuel tank leakage inspection system is provided. The method according to claim 1,
And the control unit detects leaks in the upper and lower fused portions of the fuel tank through the test gas analyzer when the valve on the check line is open-controlled. delete The method according to claim 1,
The control unit opens both the transfer line and the check line valve at the time of the leak inspection, controls the inner vacuum pump and the outer vacuum pump to form both the inside and the outside of the fuel tank, and closes both the transfer line and the check line valve And the test gas tank is injected into the fuel tank by controlling the test gas tank. The method according to claim 1,
Wherein the control unit opens a valve by opening a valve through an external vacuum pump before opening each valve to selectively open each valve to inspect the leak and check the leakage of the fuel. system. delete delete
KR1020150184595A 2015-12-23 2015-12-23 System for inspecting leakage of fueltank KR101816788B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150184595A KR101816788B1 (en) 2015-12-23 2015-12-23 System for inspecting leakage of fueltank

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Application Number Priority Date Filing Date Title
KR1020150184595A KR101816788B1 (en) 2015-12-23 2015-12-23 System for inspecting leakage of fueltank

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KR20170075827A KR20170075827A (en) 2017-07-04
KR101816788B1 true KR101816788B1 (en) 2018-01-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210121670A (en) 2020-03-31 2021-10-08 비오티 주식회사 Apparatus for detecting gas leak and system using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210121670A (en) 2020-03-31 2021-10-08 비오티 주식회사 Apparatus for detecting gas leak and system using the same

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