KR20240070761A - All-in-one type leak detection apparatus and leak detection method using the same - Google Patents

Abstract

An all-in-one type leak detection device and a leak detection method using the same are disclosed.
Among these, the all-in-one type leak detection device includes a leak detection sensor that detects a leaking sample, a leak detection module that determines whether the sample is leaking by comparing the detection value detected by the leak detection sensor with a preset setting value; A control monitor that is connected to the leak detection module, inputs and changes set values, and transmits the changed contents to the leak detection module. The leak detection sensor includes a liquid leak detection sensor that detects whether the sample is liquid. Liquid sensing unit; A temperature sensing unit that detects the temperature of the sample; It is a composite sensor consisting of a resistance and breakdown voltage sensing unit that detects the resistance and breakdown voltage of the sample, a capacitance sensing unit that detects the capacitance of the sample, and an electrode sensing unit that includes a pH sensing unit that detects the pH of the sample. The leak detection module includes a receiving unit that receives detection values for each item transmitted from the liquid sensing unit, temperature sensing unit, and electrode sensing unit and input data input from the control monitor, setting values for each item, and the control. It consists of a storage unit that stores the input data of the monitor, a control unit that compares the received value received from the receiver with the setting value stored in the storage unit to determine whether there is leakage, and a transmission unit that transmits the determination result from the control unit to the control monitor. The receiver includes a liquid status receiver, a temperature value receiver, a resistance value receiver, a decomposition voltage value receiver, a capacitance value receiver, and a pH value receiver, where each receiver is turned on/off through the control monitor. It is characterized in that it further includes selectively receiving only the receiver that is configured.

Description

All-in-one type leak detection apparatus and leak detection method using the same}

The present invention relates to the field of a leak detection device for detecting leakage of a sample (chemical substance).

In more detail, it is equipped with an optical infrared detection function, pH detection function, capacitance detection function, resistance detection function, decomposition voltage detection function, and temperature detection function to detect the specimen physically, chemically, and electrically, and each detection function This relates to an all-in-one type leak detection device that can be turned on/off to enable selective or comprehensive detection depending on the characteristics of the sample to be detected, and a method of detecting leakage using the same.

The conventional leak detection device is a single detection device that has only one independent detection method among the optical infrared detection method, short circuit method, electrical conductivity detection method, capacitance detection method, pH detection method, resistance detection method, and decomposition voltage detection method. It is divided into a complex detection method that mixes two detection methods, such as resistance detection and optical infrared detection, or resistance detection and decomposition voltage detection, which can use two detection methods in parallel.

For reference, to explain each detection method, first, in the optical infrared detection method, when light is emitted from the transmitter, the receiver receives light. When liquid comes into contact, the state of light received by the receiver changes, and this difference is This is a detection method that outputs a different voltage signal. This method does not show light change due to solids or gases, but only shows light change in liquids. A disadvantage of this detection method is that if the sensor is exposed to a lot of external light, it may be affected and malfunction, so light exposure must be minimized when manufacturing the sensor. This method can confirm the presence or absence of liquid, but cannot distinguish the type of liquid.

Next, the capacitance detection method does not detect the degree of obstruction to the flow of current like a resistance, but detects the change in current according to the capacitance value generated when an object to be leaked comes into contact between two electrodes that are separated from each other. This is a method of detecting the change in current by amplifying and outputting it. In this method, if the electrode surface area of the sensor is small, the capacitance value generated by the uniform electric field is relatively very small, making it difficult to detect leakage by measuring the capacitance value in the controller.

When these capacitive liquid leak detection devices are installed outdoors, the conductor resistance value increases in proportion to the sensor installation distance, resulting in a relative decrease in capacitance value, which causes water, water-soluble ionic substances, and polar organic solutions. There is a problem in that malfunction of the sensing device occurs due to poor detection discrimination for non-polar organic solutions, and in a uniform electric field, there is a problem in that a capacitance value is generated regardless of the type of material.

Next, the pH detection method measures the concentration of hydrogen ions contained in various aqueous solutions using a pH sensor, and is basically used in manufacturing process control and quality management in chemicals, food, medicine, environment, and semiconductors. Depending on the type, they can be divided into bench top, portable and continuous measurement systems.

The pH electrode, which is the core of the pH sensing method, depending on its material, is the most commonly used glass electrode, polymer-type electrode using a hydrogen ion-selective material, metal (Sb, Ir, Pd, Pt, etc.), or metal oxide (Sb ₂ O ₃ , etc.) are divided into solid electrodes using semiconductors, ISFETs using semiconductors, etc. Among these, glass electrodes are the most widely used and effective, but their durability against impact is weak, contaminated electrodes cannot be reused immediately, and above all, glassy electrodes are soluble in hydrofluoric acid (HF), so the pH of samples containing hydrofluoric acid is low. It is difficult to measure.

Therefore, not only can glassy pH electrodes not guarantee the reliability of measurement values in the long term, but the electrodes must be replaced frequently. In the case of ISFETs using solid electrodes and Pt-gates using metals (Sb, Ir, Pt, etc.) or metal oxides (Sb ₂ O ₃ , IrO ₂ , PtO ₂ , etc.), which have recently been commercialized in foreign countries, the material of the sensitive part is different. It has the advantage of being unaffected by hydrofluoric acid and having strong durability (impact, etc.). In particular, solid electrodes using metals (Sb, Ir, Pt, etc.) or metal oxides (Sb ₂ O ₃ , IrO ₂ , PtO ₂ , etc.) have the advantage that they can be reused through polishing if the electrode surface is contaminated.

Next, the resistance detection method detects the specific resistance of a chemical substance, but the change in resistance is large and unstable depending on the amount of contact with the sensor and the external temperature. On the other hand, non-polar organic materials such as MDI, TDI, toluene, xylene, benzene, galdenum, gasoline, and diesel oil are almost insulating materials, so it is difficult to measure them with a tester that measures the 0 to 30 MΩ range. Therefore, this method works well only for polar chemicals, including water, but it is difficult to measure non-polar chemicals.

Next, the decomposition voltage detection method detects the oxidation-reduction reaction by applying the voltage (decomposition potential) necessary to cause electrolysis to a water-soluble compound. This method consists of ionic bonds or coordination bonds soluble in water such as HCl, HF, HBr, HCOOH, H ₂ O ₂ , CH ₃ COOH, H ₂ SO ₄ , HNO ₃ , H ₃ PO ₄ , BBr ₃ , POCl ₃ , Acidic substances such as POBr ₃ , SiCl ₄ , Si ₂ Cl ₆ , TiCl ₄ , GeCl ₄ , SbCl ₃ , NH ₄ OH, NaOH, KOH, LiOH, CsOH, NaOR, sodium chlorate, potassium chlorate, potassium perchlorate, potassium permanganate, etc. It is very useful in detecting basic substances, salt substances such as sodium cyanide, sodium chloride, ammonium nitrate, potassium nitrate, sodium nitrate, and ammonium chloride. Ion-binding materials do not conduct current on their own but supply electrical energy to induce an involuntary reaction, where (+) ions are reduced at the (-) cathode and (-) ions are generated at the (+) anode (anode). This oxidation redox reaction occurs. In this way, the decomposition voltage of numerous ionic substances can be known from the standard reduction potential difference as the required current or voltage value required to decompose the substance. However, ionic substances are well detected by the decomposition voltage detection method, but polar organic substances and non-polar organic substances rarely ionize and cannot be detected by the decomposition voltage detection method.

Previously, among the above-mentioned detection methods, a single detection method in which only one of the detection methods was applied or a complex detection method in which two were applied were applied. In this case, only one or two characteristics of the chemical, physical, and electrical characteristics of the chemical substance as a sample were detected. As this could happen, a judgment error occurred in which it was judged to be a leak as it reacted not only to the sample in question but also to similar samples other than the sample in question. As a result, there was a problem that the reliability of leak detection was lowered.

Public Patent Publication No. 10-2022-0028803 Registered Patent Publication No. 10-1623537

The present invention is to solve the problems of conventional leak detection devices. The purpose of the present invention is to provide an optical infrared detection function, a pH detection function, a capacitance detection function, a resistance detection function, and We provide an all-in-one type leak detection device that has both a decomposition voltage detection function and a temperature detection function, and allows each detection function to be turned on/off, enabling selective or comprehensive detection depending on the characteristics of the sample being detected.

Another object of the present invention is to provide a method for detecting leakage using the above-described all-in-one type leakage detection device.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

The present invention for achieving the above object is a leak detection sensor that detects a leaking sample, and a leak detection module that determines whether the sample is leaking by comparing the detection value detected by the leak detection sensor with a preset setting value. ; A control monitor that is connected to the leak detection module, inputs and changes set values, and transmits the changed contents to the leak detection module. The leak detection sensor includes a liquid leak detection device that detects whether the sample is liquid. It further includes a complex sensor consisting of a liquid sensing unit, a temperature sensing unit for detecting the temperature of the sample, and an electrode sensing unit for detecting the resistance and decomposition voltage, capacitance, and pH of the sample, and the leak detection module detects whether the liquid is present. A receiving unit that receives the detection values for each item transmitted from the sensing unit, the temperature sensing unit, and the electrode sensing unit and the input data input from the control monitor, a storage unit that stores the setting values for each item and the input data of the control monitor, It includes a control unit that compares the reception value received from the receiver and the setting value stored in the storage unit to determine whether there is a leak, and a transmission unit that transmits the determination result from the control unit to the control monitor, wherein the receiver includes a liquid status receiver, It has a temperature value receiver, a resistance value receiver, a decomposed voltage value receiver, a capacitance value receiver, and a pH value receiver, and each receiver is controlled on/off through the control monitor, and only the receiver that is turned on is selectively received. An all-in-one type leak detection device is provided.

Preferably, the leak detection sensor includes a sensor housing having a cylindrical shape with open upper and lower parts; A cylindrical sensor mounting block built into the sensor housing and provided with respective sensor mounting grooves in the vertical direction where the liquid detection sensor, temperature detection sensor, and electrode sensor are mounted; It is in the shape of a plate, and an opening hole is provided in the center into which the lower part of the sensor housing is inserted. Fastening parts that are screwed to the housing and the sensor mounting block are provided on both sides of the edges of the opening hole, and the edges of the plate are provided to the fixed body. A fixing plate provided with a fixing hole for fixing; and a cover that shields the open top of the sensor housing.

Preferably, the sensor housing is made of a chemically resistant polymer material or a metal material. The polymer material may be any one of PE, PP, PVC, PTFE, and ETFE, and the metal material may be any one of stainless steel, copper, and brass. .

Preferably, the leak detection module is composed of a module housing and a control module built into the module housing, wherein the control module includes the detection value for each item detected from the leak detection sensor and the input input from the setting monitor. A receiving unit that receives data; a storage unit that temporarily stores the detection values for each item and the setting values input from the setting monitor; A control unit that compares the detection value stored in the storage unit with the set value to determine whether the sample is leaking; and a transmission unit that transmits the determination result from the control unit to the setting monitor.

Preferably, when the control unit determines that the sample has leaked, it may further include a warning alarm unit that is activated by the control unit.

The present invention for achieving another purpose is a leak detection method using the all-in-one type leak detection device described above, in which the measured value for each item received by the selected receiver of the leak detection module and the corresponding setting value all match. Only in some cases, a leakage detection method is provided that determines that the sample has leaked and activates a warning alarm simultaneously with the leakage determination.

According to an embodiment of the present invention, harmful chemicals that were difficult to detect with existing leak detectors can be detected, and the effects of minimizing casualties, property damage, and environmental damage due to leaks and relieving psychological anxiety about leaks There is.

In addition, the present invention can detect the capacitance value of a chemical substance, the presence or absence of light refraction, the specific resistance value, the pH intensity, the electrolysis value, and the presence or absence of exothermic and endothermic reactions, etc. with a single device, so that 1) water, 2) Hydrogen peroxide, 3) Acidic solutions, basic solutions, electrolytes, inorganic solutions, 4) Polar organic solutions (alcohols, ketones, amines, esters, amides, ethers, carboxylic acids, alkyl halides, imines, nitriles, sulfides, aldehydes, It is possible to accurately classify and detect substances by dividing them into groups such as substances with high dielectric constants such as acid chlorides) and 5) non-polar organic solutions (substances with very low dielectric constants such as hexane, heptene, toluene, xylene, MDI, diesel fuel, kerosene, and oil). .

In addition, the present invention has the effect of detecting heat or fire when a leaked chemical substance comes in contact with another substance due to the temperature detection method, which is one of the detection methods. For example, it is particularly effective in detecting oxides, such as hydrogen peroxide.

The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is an overall configuration diagram of an all-in-one type leak detection device according to the present invention;
Figure 2 is a block diagram of an all-in-one type leak detection device according to the present invention;
Figure 3 is an assembled and disassembled perspective view of the leak detection sensor according to the present invention;
Figure 4 is a flow chart to explain the leak detection method according to the present invention.

The embodiments described in the present invention and the configurations shown in the drawings are merely preferred examples of the disclosed invention, and at the time of filing this application, there may be various modifications that can replace the embodiments and drawings of the present specification.

In addition, the same reference numbers or symbols shown in each drawing of this specification indicate parts or components that perform substantially the same function.

Additionally, the terms used in this specification are used to describe embodiments and are not intended to limit or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. The existence or addition of numbers, steps, operations, components, parts, or combinations thereof is not excluded in advance.

In addition, terms including ordinal numbers such as “first”, “second”, etc. used in this specification may be used to describe various components, but the components are not limited by the terms, and the terms It is used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component.

Meanwhile, the terms “front,” “rear,” “top,” “bottom,” “front,” and “bottom” used in the following description are defined based on the drawings, and the shapes of each component are defined by these terms. and location is not limited.

Hereinafter, an embodiment of an all-in-one type leak detection device according to the present invention will be described with reference to the accompanying drawings.

The all-in-one type leak detection device 100 according to the present invention consists of an optical infrared detection method, a capacitance detection method, a pH detection method, a resistance detection method, a decomposition voltage detection method, and a temperature detection method in one system to detect the liquid. It is characterized by allowing the detection method to be selected according to the characteristics of the chemical substance.

This all-in-one type leak detection device 100 may include a leak detection sensor 200, a leak detection module 300, and a control monitor 400, as shown in FIGS. 1 and 2.

The leak detection sensor 200 is a complex sensor that can physically, chemically, and electrically detect a chemical substance (sample) when it comes into contact with a conductive wire.

Chemical substances have various chemical/physical properties such as resistance, decomposition voltage, pH, reaction heat generation by catalyst, degree of refraction, electric field, boiling point, melting point, color, density, temperature, specific gravity, thermal conductivity, specific heat, solubility, vapor pressure, and electrical conductivity. , and capacitance are different. The most ideal way to detect leaks of hazardous chemicals is to detect leaked hazardous chemicals by applying detection technology to various chemical, physical, and electrical properties to detect the most effective leakage.

This leak detection sensor 200 may be composed of a liquid sensing unit 210, a temperature sensing unit 220, and an electrode sensing unit 330.

Here, the liquid sensing unit 210 serves to detect whether the sample (chemical substance) is liquid, and the temperature sensing unit 220 serves to detect the temperature of the sample. The two sensing units serve to detect leakage. The physical and chemical properties of the sample are detected.

The liquid sensing unit 210 may be an optical sensor. The optical sensor is composed of a structure in which the light irradiated from the light emitting unit is refracted through the triangular cross-section of the prism and the returned light is received in the light receiving unit. When the liquid comes into contact with the prism, the refractive index of the light through the prism changes and the light receiving unit receives the returned light. The amount of light received becomes reduced or absent. The optical sensor detects liquid from this change in the amount of light received.

The temperature sensing unit 220 may use an NTC thermistor. The temperature sensing unit 220 detects the temperature when the sample is contacted. If the sample comes into contact with the sensing catalyst ball connected to the NTC thermistor of the leak detection sensor and generates heat, the temperature will appear above the set temperature. When measuring the temperature of a sample in contact with the NTC thermistor of the leak detection sensor 200, the starting temperature (or current temperature) is measured when three signals are generated.

For samples that generate heat due to a catalyst, a warning signal appears when the temperature goes above (or below) the set temperature at the set time. Liquids appear in different states depending on the four seasons. In other words, water becomes a liquid when it is above 0℃ and a solid when it is below 0℃, and ethanol becomes a liquid when it is above -114.1℃ and a solid when it is below -114.1℃.

Therefore, the temperature of the sample in contact with the sensing catalyst ball depends on the melting point (or freezing point) of the sample depending on the four seasons. On the other hand, when hydrogen peroxide comes into contact with the sensing catalyst ball made of manganese dioxide as a catalyst, heat is generated and the temperature rises, and if it exceeds the set temperature after a set time, a leak signal appears. The melting points (or freezing points) of common chemicals are shown in [Table 1] below.

freezing point of chemicals matter Freezing point (℃) Boiling point (℃) water 0 100 Acetic acid (99.5%) 16.6 118 Ethanol (99.5%) -114.1 78.37 Methanol (95 to 99.9%) -98 64.7 Hydrogen peroxide (35%) 33 108 Methyl ethyl ketone (99.9%) -86 80 MDI (50 to 60%) 15 to 20 - Benzene (99.9) 5.49 80.09 Toluene (99.9%) -93 110~111 Dichloromethane (99,9%) -97 40 Sulfuric acid (95 to 97%) -20 295~315 Hydrochloric acid (35 to 38%) -25.4 50.5 Sodium hydroxide (10 to 30%) 1.67 112.78 ammonia -55 38 (at 1013 mPa)

The electrode sensing unit 230 detects the electrical properties of the sample, that is, resistance, decomposition voltage, capacitance, and pH. The resistance is for detecting organic resistance, inorganic resistance, water resistance, and high resistance, and the decomposition Voltage detects inorganic decomposition and water decomposition. Here, in measuring the capacitance, the capacitance value that appears when the sample is in contact with the surface of the electrode sensing unit 230 is largely divided into three types. For this purpose, the electrode sensing unit 230 includes a resistance and breakdown voltage sensing unit 231 that detects the resistance and breakdown voltage of the specimen, a capacitance sensing unit 232 that senses the capacitance of the specimen, and a capacitance sensing unit 232 that senses the pH of the specimen. It may consist of a pH sensing unit 233.

When the sample is water or an inorganic material, a relatively high capacitance is shown, an organic material shows a relatively low capacitance, and an insulating material shows almost no capacitance. The capacitance value varies slightly depending on the surface area of the electrode, the temperature of the sample, and the volume of the sample in contact. Based on this, the capacitance sensing method of the present invention can be divided into three groups as shown in [Table 2].

Classification of chemicals according to electrostatic capacity matter Capacitance value level Water, inorganic substances (acidic, basic substances), etc. height polar organic substances middle oils lowness

In addition, the pH value is measured by measuring the potential difference of the sample between the two electrodes of the electrode sensing unit 330, thereby measuring the pH value of the chemical substance. In this embodiment, to measure pH, the electrode sensing unit 330 uses a reference electrode made of Ag/AgCl, antimony (Sb), iridium (Ir), palladium (Pd), or platinum (Pt), and another form of SUS wire. Ir/IrOx, Sb/Sb ₂ O ₃ , Ir/IrO ₂ , Pd/PdO ₂ , Pt/PtO ₂ , SnO ₂ , PtO ₂ , TiO ₂ , OsO ₂ , RhO ₂ , RuO ₂ and Ta ₂ O ₅ etc. The pH value of the sample is detected by calculating the potential difference between the metal oxide-coated sensing electrodes as a pH value. This pH detection method can be divided into acidic, neutral, and basic depending on the pH strength measured when the sample comes in contact with the electrode sensor. In this way, the leak detection sensor 200 has all the conditions to detect hazardous chemicals physically, chemically, and electrically, so any chemical substance can be detected by the leak detection sensor according to the present invention.

In this embodiment, the leak detection sensor 200 may be composed of a sensor housing 240, a sensor mounting block 250, a fixing plate 260, and a cover 270.

The sensor housing 240 is a cylindrical case with open upper and lower parts. According to this embodiment, the sensor housing may have a thickness of 1.0 to 2.0 mm, a diameter of 20 to 50 mm, and a height of 10 to 50 mm, but is not limited to this. no.

The sensor housing 240 is preferably made of a chemical-resistant material, considering that it may repeatedly come into contact with hazardous chemicals that are samples. For example, PP. Polymer materials such as PE (or HDPE), PTFE (Teflon), and ETFE (Ethylene Tetrafluoroethylene) can be applied, and metal materials such as SUS 316, copper, and brass can be applied.

The sensor mounting block 250 is built into the sensor housing 240 and is for mounting the complex sensor (liquid sensing unit, temperature sensing unit, and electrode sensing unit), and has the sensor housing 240 and the sensor housing 240 on the side. A plurality of screw holes 251 for screw connection are formed, and a sensing mounting hole for inserting and mounting the liquid sensing unit 210, temperature sensing unit 220, and electrode sensing unit 230 in the vertical direction. (252,253,254) may be formed to penetrate each.

Unexplained symbols (255) and (256) are connection grooves between the air hole and the power cable (280). Here, the air hole 255 is for discharging the air generated between the bottom surface and the sample when the sample contacts the bottom surface of the leak detection sensor 200 to the outside. This is to prevent the detection accuracy from being reduced due to air. This is a configuration for

The fixing plate 260 is for fixing the leak detection sensor 200 to the fixture, and has a plate shape. An opening hole 261 is formed in the center into which the lower part of the sensor housing 240 is inserted. A fastening portion 262 is formed on the edge of 261 to be screwed into the screw hole 241 of the housing 240, and a fixing hole 263 is formed on the edge of the plate for screwing to the counterpart. . Here, the opening hole 261 is the part where the sample comes into contact with the composite sensor.

The cover 270 is coupled to the open upper part of the housing 240 and serves to shield the upper part of the housing.

The leak detection module 300 receives the detection value detected by the leak detection sensor 200 in real time and determines whether there is a leak through logic that compares the received detection value with a preset setting value.

The leak detection module 300 may be composed of a module housing 310 and a control module 320 built into the module housing. The control module 320 is generally a PCB.

The control module 320 includes a receiving unit 321 that receives the detection value for each item detected by the leak detection sensor 200 and the input data input from the control monitor 400, the setting value for each item, and the control monitor. A storage unit 322 that stores the input data of (400), a control unit 323 that determines whether liquid is leaked by comparing the reception value received from the receiver and the setting value stored in the storage unit, and the control monitor displays the determination result. It may be composed of a transmission unit 324 that transmits to (400).

Here, the receiver 321 includes a liquid status receiver 321-1, a temperature value receiver 321-2, a resistance value receiver 321-3, and a decomposition voltage value receiver 321 to receive detection values for each item. -4), a capacitance value receiving unit 321-5, and a pH value receiving unit 321-6.

In this embodiment, each of the receiving units 321-1 to 321-6 can be selectively turned on/off by a dip switch. Accordingly, according to the on/off operation of the dip switch, the receiving unit in the on state among each of the receiving units (321-1 to 321-6) receives the detection value transmitted from the leak detection sensor 200, The receiving unit in the off state blocks reception of the detection value transmitted from the leak detection sensor 200, so the detection value is not transmitted to the control unit 323. Therefore, it is possible to select and receive only selected received data and exclude received data that is not related to the sample.

When the detection value from the selected receiver is transmitted to the control unit 323, the corresponding detection value is compared with the setting value for each item preset in the control unit to determine whether the corresponding sample is leaking.

The reason for allowing selection of detection items in this way is to improve the accuracy of measurement by selecting and measuring only the necessary items that match the sample among several detection items.

To elaborate, the standard for judging a leak is that if all the detected values of the selected item match the corresponding set value, it is judged as a leak. However, if even unnecessary parts are detected, if this item does not match the set value, it may be dangerous. Since errors that are not considered leaks may occur, it is advisable to activate and measure only necessary items to improve accuracy.

In addition, the control module 320 may be configured with a connection terminal, a communication connection terminal, a power connection terminal, and a contact terminal of the leak detection sensor 200. In particular, a plurality of channel IP address switching circuits can be configured so that the setting value can be changed using the control monitor 400, a PC, or a mobile communication device.

Additionally, the leak detection module 300 may be provided with a reset button 301 to initialize the control unit 323. The reset button 301 can prevent the control module 320 and the leak detection sensor from being damaged due to the current transmitted to the leak detection sensor 200.

In addition, the leak detection module 300 includes a power cutoff unit (not shown) that automatically cuts off the power supplied to the leak detection sensor 200 when the detection value and the set value range match the determination result of the control unit 323. It can be included. In addition, the leak detection module 300 is supplied with a high voltage of 220V when detecting a sample by the liquid sensing unit 210, the temperature sensing unit 220, and the electrode sensing unit 230, and the high voltage is supplied. During this period, the output can be controlled to be DC 24V or less by the current and voltage control unit (not shown).

Here, the liquid sensing unit 210 may be configured to always check whether the sample has leaked without turning off the power even when the sample comes into contact with the leak detection sensor 200. However, if the power is always on due to contact with the leak detection sensor 200 by the leak detection module, a load is applied to the leak detection module 300. To prevent this, it is preferable to turn off the power when the leak detection sensor 200 is contacted with the leak detection sensor. .

In addition, the electrode sensing unit 230, which detects the decomposition voltage, is a conductive wire + electrode of the leak detection sensor 200 to prevent the control module 320 from being damaged by power of 5V or less applied to the leak detection sensor 200. And - it is desirable to set the electrode to change every few seconds.

In addition, the leak detection module 300 may further include a warning alarm activated by the control unit 323 when the control unit 323 determines that the sample has leaked. Here, the warning alarm may output an alarm sound through the speaker 302 provided in the leak detection module 300, or alternatively, may cause a warning light to blink.

The leakage of the sample is judged to be a leak only when the measured value for each item received by the selected receiver of the leak detection module 300 and the corresponding set value all match, and in this case, the warning alarm occurs. These work in conjunction with each other at the same time.

The control monitor 400 is connected to the leak detection module 300, and serves to input and change the set value and transmit the changed contents to the leak detection module 300, using the operator's hand or electronic pen, etc. It can be operated by touch.

The control monitor 400 can display, for example, detection line length, measurement line disconnection information, specific line short information, water detection, hydrogen peroxide detection, ionic bonding substance detection, polar organic solution detection, and non-polar organic solution detection, etc. The presence or absence of method selection, detection upper/lower limit values, detection time setting, and presence of detection alarm can also be displayed, and the chemical detection function of multiple detection methods, detection alarm function, and detection result display function can also be displayed. In addition, the resistance value of the leak detection sensor 200, sensor length, power connection status, disconnection of the conductive wire, etc. may be displayed.

Although the above description was limited to the control monitor, it goes without saying that it can also be connected to a computer or mobile communication device.

As shown in the flowchart of FIG. 3, this all-in-one type liquid leak detection device 100 determines whether the liquid contacting substance is liquid when a sample comes into contact with the leak detection sensor 200. Liquidity is determined when a change in light occurs in the light-receiving part and the light-emitting part when the specimen comes into contact with the prism of the leak detection sensor 200.

If the sample is determined to be a liquid, the electrode sensing unit 230 detects the resistance value and decomposition voltage value of the sample. The resistance value refers to the specific resistance of the sample, and the decomposition voltage value refers to the potential difference between the two electrodes in contact with the sample. In particular, the decomposition voltage value greatly depends on the electrode material and electrolyte. Therefore, the resistance value and decomposition voltage value of the liquid can be divided into i) water, ii) hydrogen peroxide, iii) water-soluble ion-binding material, iv) polar organic solution and v) non-polar organic solution and can be expressed as in [Table 3].

number Type of solution breakdown voltage resistance One Acids, Bases, Electrolytes 1.40 to 5.00 V 100~1200 Ω 2 Water, rainwater, industrial water 3.80~4.80V 1201Ω ~ 200 ㏀ 3 hydrogen peroxide 3.80~4.80V 1.2 ㏀ ~ 800 ㏀ 4 polar organic solution Not detected 201 ㏀ ~ 10 ㏁ 5 non-polar organic solution Not detected 10 ㏁ or more

As shown in [Table 3], when determining the type of sample, if the resistance value of the sample is between 100 Ω and 1200 Ω and the decomposition voltage value is within 1.40 V to 5.00 V, it is judged to be an acidic solution, basic solution, or electrolyte. If the resistance value is between 1201 KΩ and 200 KΩ and the breakdown voltage value is within 3.80 V to 4.80 V, it is judged to be water, rainwater, or industrial water. Additionally, if the resistance value of the sample appears to be between 201 KΩ and 10 MΩ, which is not within the range indicated above, and the decomposition voltage value cannot be measured, it is judged to be a polar organic solution. If the resistance value of the sample is over 10 MΩ or appears to be infinite and the decomposition voltage value is not measured, use insulating gasoline, diesel oil, kerosene, toluene, xylene, benzene, hexane, MDI, TDI, Galden, robot lubricant, etc. It is judged to be a non-polar solution.

50% high purity hydrogen peroxide is stored in a 25,000L outdoor tank. In addition, a number of leak detection sensors 220 according to the present invention were installed around the joints of the tank. In order to detect whether the solution leaked on the floor was hydrogen peroxide, the control unit 323 was adjusted as follows. Afterwards, when the water and hydrogen peroxide solutions each came into contact with the leak detection sensor 220, it was checked whether warning sounds for the two solutions sounded.

Chemical/physical properties of hydrogen peroxide:

1. Liquid

2. pH: approximately 1.5 (50%) to 3.0 (30%)

3. Reaction heat generation by MnO2

4. Resistance value: approximately 2,500Ω ~ 600KΩ

5. Breakdown voltage value: approximately 3.5V ~ 4.8V

Detection method and controller settings for detecting hydrogen peroxide:

1. Optical infrared detection method: There must be refraction of light.

2. pH detection method: lowest value (L = 1.0) to highest value (H = 3.5)

3. Temperature detection method: Hydrogen peroxide generates heat by catalyst MnO2 when the temperature increases by more than 3℃ after 10 seconds after contact with the liquid.

4. Resistance detection method: lowest value (L = 2,500) ~ highest value (H = 600KΩ)

5. Resolution voltage detection method: lowest value (L = 3.5V) to highest value (H = 4.8V)

When the detection range is set in the control module 320 by manipulating the control monitor 400 as shown in [Table 4] above, if rain or water comes into contact with the leak detection sensor 200, the alarm does not operate. The reason is that although the liquid sensing unit 210 detects that the water is liquid, its temperature does not increase due to the catalyst and its pH is in the range of 68 to 73, so it is not an acidic substance. And although the decomposition voltage of water and hydrogen peroxide are similar, the resistance value of water is usually 1200Ω ~ 120KΩ. As a result, water is detected in the optical infrared and decomposition voltage values of the liquid sensing unit, but is not detected in other detection methods such as temperature, pH, and resistance detection methods. Therefore, the alarm does not work because the detection method of everyone who turned on the switch is not detected. This prevents errors in mistaking water or rainwater for chemicals.

MDI is stored in a 10,000L outdoor tank. In addition, a number of leak detection sensors 220 according to the present invention were installed around the joints of the tank. In order to detect whether the solution leaked on the floor was hydrogen peroxide, the control unit 323 was adjusted as follows. Afterwards, when water and MID (insulator) each come into contact with the leak detection sensor 220, it was checked whether warning sounds for the two solutions sounded.

Chemical/physical properties of MDI:

1. Liquid

2. pH: about 70

3. Resistance value: infinite (insulator)

4. Breakdown voltage value: None

Detection method and controller settings for detecting hydrogen peroxide:

1. Optical infrared detection method: There must be refraction of light.

2. Resistance detection method: lowest value (L = 10MΩ) to highest value (H = infinity (∞))

The detection method for insulator MDI, which is a light yellow liquid, uses liquid detection and resistance detection to distinguish between water and MDI solution. The reason is that MDI is an insulating material and has a high resistance value, so it shows high resistance, or the liquid sensing unit 210 confirms that it is a liquid by refraction of optical infrared rays, and when detection occurs, an alarm is generated. Occurs. On the other hand, water is confirmed to be a liquid due to light refraction in the optical infrared, but it is not detected due to high resistance, so the alarm does not trigger. In this way, since only the chemical substances required to detect the leak to be detected can be identified and detected, errors caused by other substances can be prevented.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

100: All-in-one type leak detection device 200: Leak detection sensor
210: liquid sensing unit 220: temperature sensing unit
230: Electrode sensing unit 231: Resistance and decomposition voltage sensing unit
232: capacitance sensing unit 233: pH sensing unit
240: sensor housing 241: screw hole
250: sensor mounting block 251: screw hole
252, 253, 254: Sensor mounting groove 255: Air hole
256: Connection groove 260: Fixed plate
261: opening hole 262: fastening part
263: fixing hole 270: cover
280: Power cable 300: Leak detection module
301: Reset button 302: Speaker
310: module housing 320: control module
321: Receiving unit 321-1: Liquid status receiving unit
321-2: Temperature value receiving unit 321-3: Resistance value receiving unit
321-4: Decomposition resistance value receiving unit 321-5: Electrostatic capacity value receiving unit
321-6: pH value receiving unit 322: Storage unit
323: control unit 324: transmission unit

Claims (6)

A leak detection sensor that detects a leaking sample, and a leak detection module that determines whether the sample is leaking by comparing the detection value detected by the leak detection sensor with a preset setting value; A control monitor that is connected to the leak detection module, inputs and changes set values, and transmits the changed contents to the leak detection module.
The leak detection sensor includes a liquid sensing unit that detects whether the sample is liquid; A temperature sensing unit that detects the temperature of the sample; It is a composite sensor consisting of a resistance and breakdown voltage sensing unit that detects the resistance and breakdown voltage of the sample, a capacitance sensing unit that detects the capacitance of the sample, and an electrode sensing unit that includes a pH sensing unit that detects the pH of the sample. Includes,
The leak detection module includes a receiver that receives the detection values for each item transmitted from the liquid sensing unit, the temperature sensing unit, and the electrode sensing unit and the input data input from the control monitor, the setting value for each item, and the input of the control monitor. It includes a storage unit that stores data, a control unit that compares the reception value received from the receiver with the setting value stored in the storage unit to determine whether there is a leak, and a transmission unit that transmits the determination result from the control unit to the control monitor,
The receiving unit has the liquid status receiving unit, a temperature value receiving unit, a resistance value receiving unit, a decomposed voltage receiving unit, a capacitance value receiving unit, and a pH value receiving unit, where each receiving unit is turned on/off controlled through the control monitor. An all-in-one type leak detection device that further includes a selective receiving device.
In claim 1,
The leak detection sensor,
A sensor housing having a cylindrical shape with the top and bottom open;
A cylindrical sensor mounting block built into the sensor housing and provided with respective sensor mounting grooves in the vertical direction where the liquid detection sensor, temperature detection sensor, and electrode sensor are mounted;
It is in the shape of a plate, and an opening hole is provided in the center into which the lower part of the sensor housing is inserted. Fastening parts that are screwed to the housing and the sensor mounting block are provided on both sides of the edges of the opening hole, and the edges of the plate are provided to the fixed body. A fixing plate provided with a fixing hole for fixing; and
a cover that shields the open top of the sensor housing;
An all-in-one type leak detection device characterized by consisting of.
In claim 2,
The sensor housing is made of a chemical-resistant polymer material or metal material,
The polymer material is any one of PE, PP, PVC, PTFE, and ETFE,
An all-in-one type leak detection device, characterized in that the metal material is any one of stainless steel, copper, and brass.
In claim 1,
The leak detection module consists of a module housing and a control module built into the module housing,
The control module is,
A receiving unit that receives the detection value for each item detected from the leak detection sensor and the input data input from the setting monitor;
a storage unit that temporarily stores the detection values for each item and the setting values input from the setting monitor;
a control unit that compares the detection value stored in the storage unit with the set value to determine whether the sample is leaking; and
An all-in-one type leak detection device, characterized in that it consists of a transmission unit that transmits the decision result from the control unit to the setting monitor.
In claim 4,
An all-in-one type leak detection device further comprising a warning alarm activated by the control unit when the control unit determines that the sample has leaked.
A leak detection method using the all-in-one type leak detection device according to any one of claims 1 to 5,
Only when the measurement values for each item received by the selected receiver of the leak detection module and the corresponding set values all match, the sample is judged to have leaked, and a warning alarm is activated at the same time as the leak is determined. method.

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