Gas concentration detection device

Abstract

A gas concentration detection device (10) is provided with a gas balancer (31), a pump (32), a gas concentration sensor (34), and a plurality of second cylinders. The gas balancer (31) is provided with a first cylinder through which a component to be detected, which is a gas, can permeate and which does not permeate moisture. The gas balancer (31) is configured so that the concentration of a component to be detected, which is a gas, can be balanced without permeation of moisture between the gas in the internal space of the first cylinder and external water. The pump (32) generates an air flow in the interior space. The gas concentration sensor (34) detects the concentration of a component to be detected in the gas. Each of the plurality of second cylinders is configured from a cylindrical wall that does not allow gas and moisture to pass therethrough. The internal space (110) of the first cylinder, the pump (32), and the gas concentration sensor (34) are connected by a plurality of second cylinders, thereby forming a circulation flow path (300) in which the gas in the flow path can circulate. The pump (32) is disposed on the downstream side of the gas balancer (31) in the circulation flow path (300).

Description

Technical Field

[0001] This invention relates to a technique for detecting the gas concentration of a target component in water. Background Technology

[0002] Non-Patent Document 1 describes an apparatus for detecting gas concentrations in water. The apparatus in Non-Patent Document 1 has a cylindrical housing. A CO2 sensor, a pressure sensor, a temperature sensor, and a battery are housed within the housing.

[0003] A gas-permeable membrane is disposed at the front end of the cylindrical shell. One side of the gas-permeable membrane is in contact with water, and the other side faces the interior space of the shell.

[0004] The target component in the water is drawn into the housing through a gas-permeable membrane. Then, after the gas concentration in the housing and water reaches equilibrium through the gas-permeable membrane, the gas concentration in the housing's internal space is measured. Thus, the gas concentration in the water is determined.

[0005] Existing technical documents

[0006] Non-patent literature

[0007] Non-patent literature 1: Environ. Sci. Technol. 2014, 48, 12126-12133 Summary of the Invention

[0008] The problem the invention aims to solve

[0009] However, in the device described in Non-Patent Document 1, the time it takes for the gas concentration in the water and the gas concentration in the gas chamber (internal space of the casing) to reach equilibrium is relatively long. Therefore, there is a relatively long time before the measurement begins.

[0010] In addition, previous gas concentration detection technologies in water were studied. Previous devices were large-scale devices that used pumps to draw in the water to be detected and circulate it.

[0011] Therefore, the object of the present invention is to provide a gas concentration detection device that can shorten the time until the gas concentration (concentration of the target component) in water and gas reaches an equilibrium state, and can also suppress large-scale development.

[0012] Solution for solving the problem

[0013] A gas concentration detection device according to one embodiment of the present invention includes a gas balancer, a pump, a gas concentration sensor, and multiple second cylinders. The gas balancer includes a first cylinder that allows the target gaseous component to pass through while preventing moisture from passing through. The gas balancer has a structure capable of balancing the concentration of the target component between the internal space of the first cylinder and the external water. The pump generates airflow within the internal space. The gas concentration sensor detects the concentration of the target component in the gas. Each of the multiple second cylinders is constructed with a cylindrical wall that prevents both gas and moisture from passing through.

[0014] A circulating flow path is formed by connecting the internal space of the first cylinder with multiple second cylinders, a pump, and a gas concentration sensor, thus enabling gas circulation within the flow path. The pump is positioned downstream of the gas balancer in the circulating flow path.

[0015] In this structure, since gas flows within the flow path of the gas balancer, gas exchange between the gas within the flow path and the water is promoted. Therefore, the time required to reach equilibrium between the concentration of the target component in the water and the concentration of the target component in the gas within the flow path is shorter. Furthermore, since it is a gas-circulating pump, it can be miniaturized compared to pumps that circulate liquids.

[0016] Invention Effects

[0017] According to the present invention, the time required to reach an equilibrium state of the concentration of the target component in water and gas can be shortened, and the large-scale development of the device can be suppressed. Attached Figure Description

[0018] Figure 1 This is a schematic external view of the gas concentration detection device according to the first embodiment.

[0019] Figure 2 This is a functional block diagram of the gas concentration detection device according to the first embodiment.

[0020] Figure 3 This is a chart illustrating the changes in carbon dioxide concentration in the gas for different connection methods.

[0021] Figure 4 This is a functional block diagram of the gas concentration detection device according to the second embodiment.

[0022] Figure 5 This is a functional block diagram of the gas concentration detection device according to the third embodiment.

[0023] Figure 6 This is a functional block diagram of the gas concentration detection device according to the fourth embodiment.

[0024] Figure 7 This is a functional block diagram of the gas concentration detection device according to the fifth embodiment.

[0025] Figure 8 This is a functional block diagram of the gas concentration detection device according to the sixth embodiment.

[0026] Figure 9 This is a functional block diagram of the gas concentration detection device according to the seventh embodiment.

[0027] Figure 10 This is a functional block diagram of the gas concentration detection device according to the eighth embodiment.

[0028] Figure 11 This is a functional block diagram of the gas concentration detection device according to the 9th embodiment.

[0029] Figure 12 This is a functional block diagram of the gas concentration detection device according to the 10th embodiment.

[0030] Figure 13 This is a functional block diagram of the gas concentration detection device according to the 11th embodiment.

[0031] Figure 14 This is a functional block diagram of the gas concentration detection device according to the 12th embodiment.

[0032] Figure 15 This is a functional block diagram of the gas concentration detection device according to the 13th embodiment.

[0033] Figure 16 This is a functional block diagram of the gas concentration detection device according to the 14th embodiment.

[0034] Figure 17 This is a functional block diagram of the gas concentration detection device according to the 15th embodiment. Detailed Implementation

[0035] [First Implementation]

[0036] The gas concentration detection device of the first embodiment of the present invention will be described with reference to the accompanying drawings.

[0037] Figure 1 This is a schematic external view of the gas concentration detection device according to the first embodiment. Figure 2 This is a functional block diagram of the gas concentration detection device according to the first embodiment.

[0038] (Including the overall general structure of the shape)

[0039] like Figure 1 As shown, the gas concentration detection device 10 includes a housing 100, a gas balancer 31, a dehumidifier 35, a first tube 301, a second tube 302, a third tube 303, a power cable 400, and a communication cable 500.

[0040] The housing 100 is waterproof and has a sealed internal space 110. A gas balancer 31 and a dehumidifier 35 are disposed on the outside of the housing 100.

[0041] The gas balancer 31 includes multiple hollow fiber membranes 311, a first bonding member 312, and a second bonding member 313.

[0042] The plurality of hollow fiber membranes 311 are flexible cylindrical bodies with internal spaces. The plurality of hollow fiber membranes 311 allow the target component (e.g., carbon dioxide CO2) to permeate between the internal space and the outside of the cylindrical body via the walls of the cylindrical body, while substantially blocking the permeation of moisture. The hollow fiber membranes 311 correspond to the "first cylindrical body" of the present invention.

[0043] The first connecting member 312 is connected to one end of the plurality of hollow fiber membranes 311. The first connecting member 312 has a gas inlet P31i. The first connecting member 312 communicates the inlet P31i with the internal space of the plurality of hollow fiber membranes 311.

[0044] The second connecting member 313 is connected to the other end of the plurality of hollow fiber membranes 311. The second connecting member 313 has a gas outlet P31o. The second connecting member 313 communicates the outlet P31o with the internal space of the plurality of hollow fiber membranes 311.

[0045] Thus, the gas balancer 31 causes the gas to flow in from the inlet P31i, flow into the internal space of the multiple hollow fiber membranes 311, and flow out from the outlet P31o.

[0046] Furthermore, the gas balancer 31 is not limited to hollow fiber membrane 311; any material that allows gas to pass through but not moisture can also be used, such as porous tubes.

[0047] The dehumidifier 35 is, for example, composed of a dehumidifying cylinder (corresponding to the third cylinder) and a desiccant. The dehumidifying cylinder is composed of a cylindrical wall that prevents gas and moisture outside the housing 100 from passing through and has a gas passage. The desiccant is contained (filled) in the dehumidifying cylinder.

[0048] The first tube 301, the second tube 302, and the third tube 303 are cylindrical bodies with cylindrical walls that prevent gas and moisture from passing through, and have gas communication channels by utilizing their hollow shape. The first tube 301, the second tube 302, and the third tube 303 correspond to the "second cylindrical body" of the present invention.

[0049] One end of the first pipe 301 is connected to the outlet P31o of the gas balancer 31. The other end of the first pipe 301 is connected to the housing 100. Thus, the outlet P31o of the gas balancer 31 and the internal space 110 of the housing 100 are connected by the first pipe 301.

[0050] One end of the second pipe 302 is connected to the housing 100. The other end of the second pipe 302 is connected to one end of the dehumidifier 35. Thus, the internal space 110 of the housing 100 and the dehumidifier 35 are connected by the second pipe 302.

[0051] One end of the third pipe 303 is connected to the other end of the dehumidifier 35. The other end of the third pipe 303 is connected to the inlet P31i of the gas balancer 31. Thus, the dehumidifier 35 and the inlet P31i of the gas balancer 31 are connected by the third pipe 303.

[0052] (Structure within the casing 100)

[0053] like Figure 2 As shown, the gas concentration detection device 10 also includes a controller 21, a pump 32, a gas state detection sensor 33, a gas concentration sensor 34, a fourth tube 304, and a fifth tube 305. The controller 21, pump 32, gas state detection sensor 33, gas concentration sensor 34, fourth tube 304, fifth tube 305, a portion of the first tube 301, and a portion of the second tube 302 are built into the internal space 110 of the housing 100.

[0054] The fourth tube 304 and the fifth tube 305 are made of the same material as the first tube 301, the second tube 302 and the third tube 303 described above.

[0055] The controller 21 is, for example, composed of an electronic circuit module.

[0056] Pump 32 is, for example, a piezoelectric pump, which is capable of achieving a large flow rate at low pressure. Pump 32 has an inlet P32i and an outlet P32o. Pump 32 is driven to draw in gas through the inlet P32i and to discharge gas from the outlet P32o at a predetermined flow rate.

[0057] The gas state detection sensor 33 includes at least one of a temperature sensor element, a humidity sensor element, and a pressure sensor element. The gas state detection sensor 33 detects the state (temperature, humidity, and pressure) of the incoming gas and generates gas state detection data. If the gas state detection sensor 33 includes a temperature sensor element, the gas state detection data includes the gas temperature; if the gas state detection sensor 33 includes a humidity sensor element, the gas state detection data includes the gas humidity; and if the gas state detection sensor 33 includes a pressure sensor element, the gas state detection data includes the pressure.

[0058] The gas concentration sensor 34 has a first port P34i for gas inflow and a second port P34o for gas outflow. The gas concentration sensor 34 measures the concentration of the target component contained in the gas flowing in through the first port P34i and generates measurement data. For example, the gas concentration sensor 34 measures the concentration of carbon dioxide (CO2) contained in the gas. Furthermore, the target component is not limited to carbon dioxide; it can also be methane, etc.

[0059] (Structures related to power supply and data communication)

[0060] The power supply 40 is connected to the gas concentration detection device 10 via a power cable 400. The operating device 50 is connected to the gas concentration detection device 10 via a communication cable 500.

[0061] Unlike the gas concentration detection device 10, the power supply 40 and the operating device 50 are not installed in water; for example, they are installed on water or on land. If installed on water, the power supply 40 and the operating device 50 are installed on a ship or a buoy. If installed on a buoy, they are housed in a waterproof casing.

[0062] Power supply 40 supplies power to controller 21, pump 32, gas state detection sensor 33 and gas concentration sensor 34 via power cable 400.

[0063] The operating device 50 is connected to the controller 21 via a communication cable 500, and communication is established between the operating device 50 and the controller 21. The operating device 50 controls the controller 21.

[0064] The controller 21 is electrically connected to the gas state detection sensor 33 and the gas concentration sensor 34. The controller 21 controls the operation of the gas state detection sensor 33 and the gas concentration sensor 34.

[0065] The controller 21 acquires gas state detection data from the gas state detection sensor 33. The controller 21 acquires measurement data of the concentration of the detected component from the gas concentration sensor 34.

[0066] The controller 21 corrects the measurement data of the concentration of the detected component based on the gas state detection data, and calculates the measurement result of the concentration of the detected component as a gas concentration detection device 10. The controller 21 sends the measurement result of the concentration of the detected component to the operating device 50. At this time, the controller 21 can correct the error of the measurement data caused by the environmental dependence of the gas concentration sensor 34 by using the gas state detection data (temperature, humidity, air pressure). As a result, the controller 21 can calculate the concentration of the detected component with high accuracy.

[0067] In addition, the operating device 50 may also have wireless communication capabilities, such as sending the measurement results of the concentration of the detected target component to an external data processing device.

[0068] (Structure of Circulation Path 300)

[0069] The other end of the first tube 301 is guided from the outside of the housing 100 to the internal space 110 and connected to the suction port P32i of the pump 32. One end of the fourth tube 304 is connected to the discharge port P32o of the pump 32. The other end of the fourth tube 304 is connected to the gas state detection sensor 33. One end of the fifth tube 305 is connected to the gas state detection sensor 33. The other end of the fifth tube 305 is connected to the first port P34i of the gas concentration sensor 34. One end of the second tube 302 is connected to the second port P34o of the gas concentration sensor 34. The second tube 302 is guided from the internal space 110 of the housing 100 to the outside.

[0070] Thus, the gas balancer 31, the first pipe 301, the pump 32, the fourth pipe 304, the gas state detection sensor 33, the fifth pipe 305, the gas concentration sensor 34, the second pipe 302, the dehumidifier 35, and the third pipe 303 are arranged in sequence to form a gas circulation path 300. The gas flowing inside this circulation path 300 corresponds to the "gas inside the flow path" of the present invention.

[0071] (To detect the components of the target substance contained in the moisture)

[0072] The gas concentration detection device 10 is disposed in water. The gas balancer 31 and the dehumidifier 35 are exposed in water because they are disposed outside the housing 100.

[0073] By exposing the gas balancer 31 to the water, multiple hollow fiber membranes 311 are exposed to the water. In this state, the multiple hollow fiber membranes 311 allow the target component (target gas) contained in the water to permeate into the internal space of each hollow fiber membrane 311.

[0074] If this state is maintained for a predetermined time, the concentrations of the target component in the internal space (gas within the flow path) of the hollow fiber membrane 311 and in the water become approximately equal. Subsequently, the permeation rate of the target component from the water into the internal space (gas within the flow path) of the hollow fiber membrane 311 and the permeation rate of the target component from the internal space (gas) of the hollow fiber membrane 311 into the water stably become approximately equal. This state represents an equilibrium state of the concentration of the target component between the internal space (gas within the flow path) of the hollow fiber membrane 311 and the water.

[0075] Furthermore, in equilibrium, by measuring the concentration of the target component by the gas concentration sensor 34, the gas concentration detection device 10 can measure the concentration of the target component contained in the water and detect the target component contained in the water.

[0076] More specifically, the gas concentration detection device 10 is used to detect the target components contained in the water.

[0077] First, as described above, the gas concentration detection device 10 is placed in water. Next, the operating device 50 controls the power supply 40 to energize the controller 21, pump 32, gas state detection sensor 33, and gas concentration sensor 34. As a result, the controller 21, pump 32, gas state detection sensor 33, and gas concentration sensor 34 are activated.

[0078] By starting pump 32, such as Figure 2 As shown by the dashed arrow, gas flows within the circulation path 300. Specifically, since the suction port P32i of the pump 32 is connected to the outlet P31o of the gas balancer 31 only through the first pipe 301, the pump 32 draws in gas from the circulation path within the gas balancer 31.

[0079] The gas drawn into the flow path by pump 32 is ejected from the outlet P32o of pump 32 and flows into the gas state detection sensor 33 via the fourth pipe 304. The gas flowing out of the flow path from the gas state detection sensor 33 flows into the first port P34i of the gas concentration sensor 34 via the fifth pipe 305. The gas flowing out of the second port P34o of the gas concentration sensor 34 returns to the inlet P31i of the gas balancer 31 via the second pipe 302, the dehumidifier 35, and the third pipe 303.

[0080] Thus, pump 32 is positioned on the outlet P31o side of gas balancer 31 in circulation flow path 300, i.e., downstream of gas balancer 31. Furthermore, no gas state detection sensor 33, gas concentration sensor 34, or dehumidifier 35 is configured between the outlet P31o of gas balancer 31 and the inlet P32i of pump 32.

[0081] According to this structure, the gas (gas within the flow path) passing through the internal spaces of the multiple hollow fiber membranes 311 of the gas balancer 31 flows at a predetermined flow rate. Thus, the gas (gas within the flow path) within the internal spaces of the multiple hollow fiber membranes 311 of the gas balancer 31 can be stably replaced, and the difference between the concentration of the target component in the water and the concentration of the target component within the internal spaces of the multiple hollow fiber membranes 311 (the difference in concentration of the target component between the water and the internal spaces of the multiple hollow fiber membranes 311) is kept as large as possible at all times until an equilibrium state is reached.

[0082] Therefore, the gas concentration detection device 10 can promote the permeation of the target component from water into the internal space (gas in the flow path) of the multiple hollow fiber membranes 311 until an equilibrium state is reached. As a result, the gas concentration detection device 10 can shorten the time to reach the equilibrium state.

[0083] Figure 3 This is a chart illustrating the changes in carbon dioxide concentration in the gas for different connection methods. Figure 3 The horizontal axis represents the time elapsed since the pump 32 was started, and the vertical axis represents the carbon dioxide concentration (the concentration of the target component) in the internal space of the multiple hollow fiber membranes 311. Additionally, φw on the vertical axis represents the carbon dioxide concentration (the concentration of the target component) in the water. Furthermore, φi is the initial value of the carbon dioxide concentration in the internal space of the hollow fiber membranes 311.

[0084] in addition, Figure 3 An example of the change in carbon dioxide concentration is shown, starting from a state where the initial carbon dioxide concentration φi in the internal space of the hollow fiber membrane 311 is higher than the carbon dioxide concentration φw in the water. Conversely, if starting from a state where the initial carbon dioxide concentration φi in the gas balancer 31 is lower than the carbon dioxide concentration φw in the water, the carbon dioxide concentration in the gas increases over time in a manner close to the carbon dioxide concentration φw in the water.

[0085] exist Figure 3 In the diagram, A represents the connection method of the first embodiment (in the order of gas balancer 31, pump 32, gas state detection sensor 33, gas concentration sensor 34, and dehumidifier 35 in the direction of gas flow). B represents the connection method of Comparative Example 1 (in the order of gas balancer 31, gas state detection sensor 33, pump 32, gas concentration sensor 34, and dehumidifier 35 in the direction of gas flow). C represents the connection method of Comparative Example 2 (in the order of gas balancer 31, dehumidifier 35, gas state detection sensor 33, pump 32, and gas concentration sensor 34 in the direction of gas flow). D represents the connection method of Comparative Example 3 (in the order of gas balancer 31, dehumidifier 35, gas concentration sensor 34, gas state detection sensor 33, and pump 32 in the direction of gas flow).

[0086] like Figure 3 As shown, by having the structure of the first embodiment (the structure of the gas concentration detection device 10), the time required to reach an equilibrium state between the concentration of the target component in the water and the concentration of the target component in the gas can be shortened. Therefore, the gas concentration detection device 10 can begin measuring the concentration of the target component in a short time.

[0087] In addition, comparison Figure 3As can be seen from A and B, the order of pump 32 and gas state detection sensor 33 can also be interchanged.

[0088] On the other hand, it is not preferable to connect a dehumidifier 35 between the outlet P31o of the gas balancer 31 and the inlet P32i of the pump 32. In other words, if a structure is constructed without connecting a dehumidifier 35 between the outlet P31o of the gas balancer 31 and the inlet P32i of the pump 32, at least the time required to reach equilibrium can be shortened.

[0089] Furthermore, the distance between the outlet P31o of the gas balancer 31 and the inlet P32i of the pump 32 in the circulation flow path 300 is preferably shorter than the distance between the outlet P32o of the pump 32 and the inlet P31i of the gas balancer 31 in the circulation flow path 300. More specifically, regarding the length of the flow path connecting the outlet P31o of the gas balancer 31 and the inlet P32i of the pump 32 (first length) and the length of the flow path connecting the outlet P32o of the pump 32 and the inlet P31i of the gas balancer 31 (second length), it is preferable that the first length is shorter than the second length.

[0090] This improves the pumping effect of pump 32 on the gas (gas within the flow path) in the internal space of the multiple hollow fiber membranes 311 in the gas balancer 31. Consequently, the gas concentration detection device 10 can more effectively and efficiently shorten the time to reach equilibrium.

[0091] Preferably, the outlet P31o of the gas balancer 31 and the inlet P32i of the pump 32 are connected only by the first pipe 301. This further improves the pumping effect of the pump 32 on the gas within the multiple hollow fiber membranes 311 of the gas balancer 31. Consequently, the gas concentration detection device 10 can more effectively and efficiently shorten the time to reach equilibrium.

[0092] And, as Figure 1 As shown, the flow path cross-sectional area S301 of the first tube 301 is smaller than the sum of the flow path cross-sectional areas S311 of each of the multiple hollow fiber membranes 311. This increases the flow rate of the gas (gas within the flow path) drawn in by the pump 32. Consequently, the suction efficiency of the pump 32 is improved, and the gas concentration detection device 10 can effectively and efficiently shorten the time to reach equilibrium.

[0093] At this time, by using multiple hollow fiber membranes 311, the flow rate within each of their internal spaces can be controlled. Specifically, for example, the flow rate within the internal spaces can be controlled to a rate that allows for efficient interperfusion of the target component between the water and the internal spaces of the multiple hollow fiber membranes 311. As a result, the gas concentration detection device 10 can further shorten the time to reach an equilibrium state.

[0094] Preferably, pump 32 is a pump capable of achieving a large flow rate at low pressure, as described above. That is, preferably, pump 32 is not a pressure pump, but a flow-rate pump (flow-priority pump). This reduces the pressure applied to the walls of the multiple hollow fiber membranes 311 and suppresses unwanted permeation of moisture into the internal spaces of the multiple hollow fiber membranes 311. Undesirable moisture inflow can lead to deterioration in measurement accuracy, short circuits, malfunctions, and other adverse effects due to moisture adhering to electronic components. Therefore, by using a flow-rate pump for pump 32, the gas concentration detection device 10 can suppress the deterioration of measurement accuracy and the reduction in reliability of the concentration of the detected component.

[0095] Furthermore, when a piezoelectric pump is used for pump 32, the driving voltage can be reduced. This allows for low-voltage driving of the gas concentration detection device 10.

[0096] Furthermore, in the gas concentration detection device 10, the controller 21, the gas state detection sensor 33, and the gas concentration sensor 34 can be constructed from ICs and small electronic circuit modules. Therefore, the housing 100 is miniaturized. As a result, the time required for the gas concentration detection device 10 to reach equilibrium between the concentrations of the target component in the water and the gas can be shortened, and the need for larger devices can be prevented. Additionally, by placing the pump 32 downstream of the gas balancer 31, the output (flow rate) of the pump 32 can be reduced. This allows for miniaturization of the pump 32, further preventing the need for larger gas concentration detection devices 10.

[0097] Furthermore, by using a piezoelectric pump for pump 32, the shape of pump 32 can also be miniaturized. As a result, the gas concentration detection device 10 can be further miniaturized.

[0098] Furthermore, in this structure, the gas balancer 31 is disposed outside the housing 100. This allows the multiple hollow fiber membranes 311 within the gas balancer 31 to be easily exposed in water. Moreover, disassembly and maintenance of the gas balancer 31 are easy.

[0099] Furthermore, in this structure, the dehumidifier 35 is disposed outside the housing 100. This makes disassembly and maintenance of the dehumidifier 35 easy.

[0100] [Second Implementation]

[0101] The gas concentration detection device of the second embodiment is described with reference to the accompanying drawings. Figure 4 This is a functional block diagram of the gas concentration detection device according to the second embodiment.

[0102] like Figure 4As shown, the gas concentration detection device 10A of the second embodiment differs from the gas concentration detection device 10 of the first embodiment in that the dehumidifier 35A is built into the internal space 110 of the housing 100. The other structures of the gas concentration detection device 10A are the same as those of the gas concentration detection device 10, and descriptions of the same parts are omitted.

[0103] The dehumidifier 35A is built into the internal space 110 of the housing 100.

[0104] Based on this structure, the gas concentration detection device 10A can perform the same function as the gas concentration detection device 10, except for the maintainability of the dehumidifier 35A. Furthermore, since the dehumidifier 35A is not exposed to water, waterproofing is not required. Therefore, a wider variety of dehumidifiers 35A can be used.

[0105] [Third Implementation]

[0106] The gas concentration detection device of the third embodiment is described with reference to the accompanying drawings. Figure 5 This is a functional block diagram of the gas concentration detection device according to the third embodiment.

[0107] like Figure 5 As shown, the gas concentration detection device 10B of the third embodiment differs from the gas concentration detection device 10 of the first embodiment in that the gas state detection sensor 33 is omitted. The rest of the structure of the gas concentration detection device 10B is the same as that of the gas concentration detection device 10, and the description of the same parts is omitted.

[0108] In the gas concentration detection device 10B, the outlet P32o of the pump 32 and the first port P34i of the gas concentration sensor 34 are connected by the fourth tube 304B.

[0109] Based on this structure, in addition to the correction of the measurement data, the gas concentration detection device 10B can perform the same function as the gas concentration detection device 10.

[0110] [Fourth Implementation]

[0111] The gas concentration detection device of the fourth embodiment is described with reference to the accompanying drawings. Figure 6 This is a functional block diagram of the gas concentration detection device according to the fourth embodiment.

[0112] like Figure 6 As shown, the gas concentration detection device 10C of the fourth embodiment differs from the gas concentration detection device 10 of the first embodiment in the order of the pump 32 and the gas state detection sensor 33 in the circulation path 300. The other structures of the gas concentration detection device 10C are the same as those of the gas concentration detection device 10, and descriptions of the same parts are omitted.

[0113] In the gas concentration detection device 10C, the inlet of the gas state detection sensor 33 is connected to the outlet P31o of the gas balancer 31 via a first pipe 301. The suction port P32i of the pump 32 is connected to the outlet of the gas state detection sensor 33 via a fourth pipe 304. The first port P34i of the gas concentration sensor 34 is connected to the discharge port P32o of the pump 32 via a fifth pipe 305. This structure is similar to the one described above. Figure 3 The structure of B shown corresponds to this.

[0114] Based on this structure, the gas concentration detection device 10C can achieve the same effect as the gas concentration detection device 10.

[0115] [Fifth Implementation]

[0116] The gas concentration detection device of the fifth embodiment is described with reference to the accompanying drawings. Figure 7 This is a functional block diagram of the gas concentration detection device according to the fifth embodiment.

[0117] like Figure 7 As shown, the gas concentration detection device 10D of the fifth embodiment differs from the gas concentration detection device 10 of the first embodiment in that it includes a battery 60 instead of a power source 40. The other structures of the gas concentration detection device 10D are the same as those of the gas concentration detection device 10, and descriptions of identical parts are omitted.

[0118] The battery 60 is built into the internal space 110 of the housing 100. The battery 60 supplies power to the controller 21, pump 32, gas state detection sensor 33 and gas concentration sensor 34 via power cable 600.

[0119] Based on this structure, the gas concentration detection device 10D can perform the same function as the gas concentration detection device 10. Furthermore, the gas concentration detection device 10D does not require a separate power supply.

[0120] [Sixth Implementation]

[0121] The gas concentration detection device of the sixth embodiment is described with reference to the accompanying drawings. Figure 8 This is a functional block diagram of the gas concentration detection device according to the sixth embodiment.

[0122] like Figure 8 As shown, the gas concentration detection device 10E of the sixth embodiment differs from the gas concentration detection device 10D of the fifth embodiment in that it includes a communication module 70 instead of an operation device 50. The rest of the structure of the gas concentration detection device 10E is the same as that of the gas concentration detection device 10D, and descriptions of identical parts are omitted.

[0123] The gas concentration detection device 10E includes a communication module 70. The communication module 70 is separately mounted from the housing 100. The communication module 70 is housed within a housing 79. The housing 79 is waterproof and has a structure that prevents moisture from leaking into the housing 79. The housing 79 is made of a water-floating material.

[0124] The communication module 70 has the function of data communication with external devices via wireless or other means. The communication module 70 is electrically connected to the controller 21 via a communication cable 700. The communication module 70 receives power from the battery 60 via a power cable 600.

[0125] In this configuration, the controller 21 performs the aforementioned measurement of the concentration of the target component, for example, upon receiving a detection start signal from an external source via the communication module 70. The controller 21 outputs the calculated measurement data of the target component concentration to the communication module 70. The communication module 70 then transmits the measurement data of the target component concentration to an external device.

[0126] Based on this structure, the gas concentration detection device 10E can perform the same function as the gas concentration detection device 10. Furthermore, since the gas concentration detection device 10E may not include a power supply 40 and an operating device 50, it can be easily positioned at the location where the target component is to be detected.

[0127] [Seventh Implementation]

[0128] The gas concentration detection device of the seventh embodiment is described with reference to the accompanying drawings. Figure 9 This is a functional block diagram of the gas concentration detection device according to the seventh embodiment.

[0129] like Figure 9 As shown, the gas concentration detection device 10F of the seventh embodiment differs from the gas concentration detection device 10E of the sixth embodiment in that it has a storage medium 210 but lacks a communication module 70. The rest of the structure of the gas concentration detection device 10F is the same as that of the gas concentration detection device 10E, and descriptions of identical parts are omitted.

[0130] The storage medium 210 is composed of a semiconductor memory or the like. The storage medium 210 is housed within the housing 100. The storage medium 210 is electrically connected to the controller 21. Alternatively, the storage medium 210 may also be housed within the controller 21.

[0131] The controller 21 stores the calculated measurement data of the concentration of the detected component. After the gas concentration detection device 10F is recovered, the controller 21 can read the stored measurement data.

[0132] Based on this structure, the gas concentration detection device 10F can achieve the same effect as the gas concentration detection device 10E. Furthermore, the gas concentration detection device 10F can be implemented with a simpler structure than the gas concentration detection device 10E.

[0133] [Eighth Implementation]

[0134] The gas concentration detection device of the eighth embodiment is described with reference to the accompanying drawings. Figure 10 This is a functional block diagram of the gas concentration detection device according to the eighth embodiment.

[0135] like Figure 10 As shown, the gas concentration detection device 10G of the eighth embodiment differs from the gas concentration detection device 10A of the second embodiment in that it omits the controller 21, the gas state detection sensor 33, and the operating device 50, and instead includes a data logger 80. The other structures of the gas concentration detection device 10G are the same as those of the gas concentration detection device 10A, and descriptions of identical parts are omitted. The dehumidifier 35G has the same structure as the dehumidifier 35A.

[0136] The outlet P32o of pump 32 is connected to the first port P34i of gas concentration sensor 34 via the sixth tube 306.

[0137] The data logger 80 is not housed within the housing 100; for example, it can be positioned on water or land. The data logger 80 receives power from the power supply 40. The data logger 80 is connected to the gas concentration sensor 34 via a communication cable 800.

[0138] The data logger 80 acquires and stores measurement data measured by the gas concentration sensor 34 via a communication cable 800.

[0139] With this structure, the gas concentration detection device 10G can achieve the same function as gas concentration detection devices in other embodiments. Furthermore, the gas concentration detection device 10G can achieve a simpler structure. Also, in the gas concentration detection device 10G, fewer functional parts are disposed within the housing 100, allowing for a more compact housing 100.

[0140] [Ninth Implementation]

[0141] The gas concentration detection device of the ninth embodiment is described with reference to the accompanying drawings. Figure 11 This is a functional block diagram of the gas concentration detection device according to the 9th embodiment.

[0142] like Figure 11As shown, the gas concentration detection device 10H of the ninth embodiment differs from the gas concentration detection device 10G of the eighth embodiment in that the data logger 80 is replaced by the controller 21. The rest of the structure of the gas concentration detection device 10H is the same as that of the gas concentration detection device 10G, and descriptions of identical parts are omitted. The dehumidifier 35H has the same structure as the dehumidifier 35G.

[0143] The controller 21 is not housed within the housing 100; for example, it can be positioned on water or land. The controller 21 receives power from the power supply 40. The controller 21 is connected to the gas concentration sensor 34 via a communication cable 211.

[0144] The controller 21 controls the operation of the gas concentration sensor 34 via the communication cable 211.

[0145] With this structure, the gas concentration detection device 10H can achieve the same effect as gas concentration detection devices in other embodiments. Furthermore, the gas concentration detection device 10H can achieve a simpler structure. Moreover, in the gas concentration detection device 10H, fewer functional parts are disposed within the housing 100, allowing for a more compact housing 100.

[0146] [10th Implementation]

[0147] The gas concentration detection device of the tenth embodiment is described with reference to the accompanying drawings. Figure 12 This is a functional block diagram of the gas concentration detection device according to the 10th embodiment.

[0148] like Figure 12 As shown, the gas concentration detection device 10I of the tenth embodiment differs from the gas concentration detection device 10G of the eighth embodiment in that the dehumidifier 35G is omitted while each tube has a dehumidification function. The rest of the structure of the gas concentration detection device 10I is the same as that of the gas concentration detection device 10G, and the description of the same parts is omitted.

[0149] The gas concentration detection device 10I includes a first tube 301I, a sixth tube 306I, and a seventh tube 307I.

[0150] The first pipe 301I is connected to the outlet P31o of the gas balancer 31 and the inlet P32i of the pump 32. The sixth pipe 306I is connected to the outlet P32o of the pump 32 and the first port P34i of the gas concentration sensor 34. The seventh pipe 307I is connected to the second port P34o of the gas concentration sensor 34 and the inlet P31i of the gas balancer 31.

[0151] The first tube 301I, the sixth tube 306I, and the seventh tube 307I are provided with a moisture-absorbing membrane on their inner wall surfaces. The dehumidifying membrane is arranged along the inner wall surfaces of each of the first tube 301I, the sixth tube 306I, and the seventh tube 307I, and is in a shape that does not block the gas flow path. The dehumidifying membrane is made of, for example, washi paper, but is not limited to this.

[0152] This suppresses condensation on the inner walls of the first tube 301I, the sixth tube 306I, and the seventh tube 307I. Consequently, in the gas concentration detection device 10I, malfunctions of the gas concentration sensor 34 caused by water droplets or the like can be suppressed.

[0153] Therefore, in the gas concentration detection device 10I, the dehumidifier shown in the above embodiments can be omitted, while achieving the same effect. Furthermore, by omitting the dehumidifier, the gas concentration detection device 10I can achieve a simpler structure.

[0154] In addition, the gas concentration detection device 10I only needs to have a dehumidification membrane in at least the 6th tube 306I.

[0155] In addition, this embodiment shows an example of a dehumidifying membrane being installed along the inner wall of each tube, but it can also be in a shape that allows gas to pass through and blocks the flow path, like a filter.

[0156] [11th Implementation]

[0157] The gas concentration detection device of the 11th embodiment is described with reference to the accompanying drawings. Figure 13 This is a functional block diagram of the gas concentration detection device according to the 11th embodiment.

[0158] like Figure 13 As shown, the gas concentration detection device 10J of the 11th embodiment differs from the gas concentration detection device 10G of the 8th embodiment in that the dehumidifier 35G is omitted and a housing 100J is included. The rest of the structure of the gas concentration detection device 10J is the same as that of the gas concentration detection device 10G, and the description of the same parts is omitted.

[0159] The gas concentration detection device 10J includes a housing 100J, a sixth tube 306, and a seventh tube 307.

[0160] The sixth tube 306 is connected to the outlet P32o of the pump 32 and the first port P34i of the gas concentration sensor 34. The seventh tube 307 is connected to the second port P34o of the gas concentration sensor 34 and the inlet P31i of the gas balancer 31.

[0161] The casing 100J is made of a material with insulating properties. Specifically, the casing 100J is made of a material with a lower thermal conductivity than ordinary metals. As an example, the casing 100J is made of a plastic material such as vinyl chloride.

[0162] According to this structure, the internal space 110 of the housing 100J is insulated to a temperature higher than that of water. By insulating the interior of the housing 100J, the sixth tube 306 disposed in the internal space 110 of the housing 100J is also insulated.

[0163] Therefore, condensation on the inner wall surface of the sixth tube 306 can be suppressed. Consequently, in the gas concentration detection device 10J, malfunctions of the gas concentration sensor 34 caused by water droplets, etc., can be suppressed.

[0164] According to this structure, the dehumidifier can be omitted in the gas concentration detection device 10J, and the same effect as the embodiments described above can be achieved. Furthermore, by omitting the dehumidifier, the gas concentration detection device 10J can achieve a simpler structure.

[0165] [12th Implementation]

[0166] The gas concentration detection device of the 12th embodiment is described with reference to the accompanying drawings. Figure 14 This is a functional block diagram of the gas concentration detection device according to the 12th embodiment.

[0167] like Figure 14 As shown, the gas concentration detection device 10K of the 12th embodiment differs from the gas concentration detection device 10F of the 7th embodiment in that the dehumidifier 35K is built into the internal space 110 of the housing 100. The rest of the structure of the gas concentration detection device 10K is the same as that of the gas concentration detection device 10F, and the description of the same parts is omitted.

[0168] The dehumidifier 35K is built into the internal space 110 of the housing 100.

[0169] Based on this structure, the gas concentration detection device 10K can achieve the same effect as the gas concentration detection device 10F. Furthermore, since the dehumidifier 35K is not exposed to water, waterproofing is not required. Therefore, a wider variety of dehumidifiers 35K can be used.

[0170] (13th implementation)

[0171] The gas concentration detection device of the 13th embodiment is described with reference to the accompanying drawings. Figure 15 This is a functional block diagram of the gas concentration detection device according to the 13th embodiment.

[0172] like Figure 15As shown, the gas concentration detection device 10L of the 13th embodiment differs from the gas concentration detection device 10K of the 12th embodiment in that it omits the gas state detection sensor 33 and the dehumidifier 35K and includes a housing 100L. The other structures of the gas concentration detection device 10L are the same as those of the gas concentration detection device 10K, and descriptions of identical parts are omitted. The housing 100L has the same structure as the housing 100J.

[0173] The gas concentration detection device 10L has a housing of 100L, a sixth tube of 306L, and a seventh tube of 307L.

[0174] The sixth tube 306L is connected to the outlet P32o of the pump 32 and the first port P34i of the gas concentration sensor 34. The seventh tube 307L is connected to the second port P34o of the gas concentration sensor 34 and the inlet P31i of the gas balancer 31.

[0175] With this structure, the internal space 110 of the housing 100L is insulated to a temperature higher than that of water. By insulating the interior of the housing 100L, the sixth tube 306L disposed in the internal space 110 of the housing 100L is also insulated.

[0176] This suppresses condensation on the inner wall of the sixth tube 306L. Consequently, in the gas concentration detection device 10L, malfunctions of the gas concentration sensor 34 caused by water droplets or the like can be suppressed.

[0177] According to this structure, the gas concentration detection device 10L can achieve the same effect as the gas concentration detection device 10K. Furthermore, by omitting the gas state detection sensor 33 and the dehumidifier 35K, the gas concentration detection device 10L can achieve a simpler structure.

[0178] (14th embodiment)

[0179] The gas concentration detection device of the 14th embodiment is described with reference to the accompanying drawings. Figure 16 This is a functional block diagram of the gas concentration detection device according to the 14th embodiment.

[0180] like Figure 16 As shown, the gas concentration detection device 10M of the 14th embodiment differs from the gas concentration detection device 10K of the 12th embodiment in that the storage medium 210 is omitted and the communication module 70M is built into the internal space 110 of the housing 100. The other structures of the gas concentration detection device 10M are the same as those of the gas concentration detection device 10, and descriptions of identical parts are omitted. The communication module 70M has the same structure as the communication module 70.

[0181] The communication module 70M is built into the internal space 110 of the housing 100.

[0182] Based on this structure, the gas concentration detection device 10M can achieve the same effect as the gas concentration detection device 10K. Furthermore, since the communication module 70M is not exposed to water, it does not need to be waterproof. Therefore, a wider variety of communication modules 70M can be used.

[0183] [15th Embodiment]

[0184] The gas concentration detection device of the 15th embodiment is described with reference to the accompanying drawings. Figure 17 This is a functional block diagram of the gas concentration detection device according to the 15th embodiment.

[0185] like Figure 17 As shown, the gas concentration detection device 10N of the 15th embodiment differs from the gas concentration detection device 10L of the 13th embodiment in that the storage medium 210 is omitted and the communication module 70N is built into the internal space 110 of the housing 100N. The other structures of the gas concentration detection device 10N are the same as those of the gas concentration detection device 10L, and descriptions of identical parts are omitted. The housing 100N has the same structure as the housing 100L. The communication module 70N has the same structure as the communication module 70. The sixth tube 306N has the same structure as the sixth tube 306L. The seventh tube 307N has the same structure as the seventh tube 307L.

[0186] The gas concentration detection device 10N comprises a housing 100N, a sixth tube 306N, and a seventh tube 307N.

[0187] According to this structure, the storage medium 210 can be omitted in the gas concentration detection device 10N, and the same effect as the gas concentration detection device 10L can be achieved.

[0188] Furthermore, while this embodiment employs a structure with heat-insulating shells, the shell material can be chosen more freely as long as a mechanism is provided that can extend the period during which the temperature inside the shell is higher than the temperature in the water. For example, the following structure can be used.

[0189] A. A heater is installed inside the housing. In this case, the interior of the housing can be kept warm by the heat from the heater. Preferably, the heater is in contact with the gas concentration sensor 34.

[0190] B. The shell is at least translucent in its upper part (the portion on the water surface). In this case, when sunlight shines into the shell, the air inside is heated, thus maintaining the temperature inside the shell.

[0191] The structures of the above-described embodiments can be appropriately combined to achieve the corresponding effects of each combination.

[0192] <1> A gas concentration detection device, wherein,

[0193] This gas concentration detection device has the following features:

[0194] A gas balancer has a first cylinder that allows the target component, which is a gas, to pass through but not water. The gas balancer can balance the concentration of the target component between the internal space of the first cylinder and the water outside.

[0195] A pump that generates airflow in the internal space;

[0196] A gas concentration sensor that detects the concentration of the component to be detected; and

[0197] Multiple second cylinders, each consisting of a cylindrical wall that prevents gas and moisture from passing through.

[0198] By connecting the internal space of the first cylinder with the plurality of second cylinders, the pump, and the gas concentration sensor, a circulating flow path capable of supplying gas circulation within the flow path is formed.

[0199] The pump is located downstream of the gas balancer in the circulation path.

[0200] <2> According to the gas concentration detection device in <1>, wherein,

[0201] The gas balancer has an inlet located upstream of the circulation path and an outlet located downstream of the circulation path.

[0202] The pump has a suction inlet located upstream of the circulation path and a discharge outlet located downstream of the circulation path.

[0203] The gas concentration sensor has a first port located upstream of the circulation path and a second port located downstream of the circulation path.

[0204] The outlet of the gas balancer is connected to the inlet of the pump.

[0205] The pump's outlet is connected to the first port of the gas concentration sensor.

[0206] The second port of the gas concentration sensor is connected to the inlet of the gas balancer.

[0207] <3> According to the gas concentration detection device of <1> or <2>, wherein,

[0208] The flow path cross-sectional area of ​​the second cylinder is smaller than that of the first cylinder of the gas balancer.

[0209] <4> Based on any one of the gas concentration detection devices from <1> to <3>, where,

[0210] The gas concentration detection device includes a gas state detection sensor that detects at least one of the temperature, humidity, and gas pressure in the circulation path of the gas.

[0211] The gas state detection sensor is connected to the circulation path.

[0212] <5> According to any one of the gas concentration detection devices in <1> to <4>, where,

[0213] The gas concentration detection device includes a dehumidifier for dehumidifying the gas in the flow path.

[0214] <6> According to the gas concentration detection device in <5>, wherein,

[0215] The dehumidifier consists of a third cylinder that prevents gas and moisture from passing through and a dehumidifier contained within the third cylinder.

[0216] <7> According to the gas concentration detection device of <5> or <6>, wherein,

[0217] The dehumidifier is connected between the second port of the gas concentration sensor and the inlet of the gas balancer.

[0218] <8> According to any one of the gas concentration detection devices in <1> to <4>, where,

[0219] The gas concentration detection device is equipped with a dehumidifying membrane for dehumidifying the gas in the flow path.

[0220] <9> According to the gas concentration detection device in <8>, wherein,

[0221] The dehumidifying membrane is installed along the inner wall surface of the second cylinder.

[0222] <10> According to any one of the gas concentration detection devices from <1> to <9>, where,

[0223] The gas concentration detection device has a housing that integrates the pump, the gas concentration sensor, and a portion of the second cylinder.

[0224] The shell is made of a material with a lower thermal conductivity than water.

[0225] <11> According to any one of the gas concentration detection devices in <1> to <9>, where,

[0226] The gas concentration detection device has a housing that integrates the pump, the gas concentration sensor, and a portion of the second cylinder.

[0227] A heater is located inside the housing.

[0228] <12> According to any one of the gas concentration detection devices in <1> to <9>, where,

[0229] The gas concentration detection device has a housing that integrates the pump, the gas concentration sensor, and a portion of the second cylinder.

[0230] The housing has a mechanism for receiving external light.

[0231] <13> According to the gas concentration detection device of <5> or <6>, wherein,

[0232] The gas concentration detection device has a housing that integrates the pump, the gas concentration sensor, and the dehumidifier.

[0233] <14> According to any one of the gas concentration detection devices in <1> to <13>, where,

[0234] The cross-sectional area of ​​the flow path of the second cylinder, from the gas balancer to the pump, is smaller than the cross-sectional area of ​​the flow path of the gas balancer.

[0235] <15> According to any one of the gas concentration detection devices in <1> to <14>, wherein,

[0236] The component to be detected is carbon dioxide.

[0237] The gas concentration sensor detects the concentration of carbon dioxide in the gas within the flow path.

[0238] <16> According to any one of the gas concentration detection devices from <1> to <15>, wherein,

[0239] The distance from the gas balancer to the pump in the circulation path is shorter than the distance from the pump to the gas balancer in the circulation path.

[0240] <17> According to any one of the gas concentration detection devices in <1> to <16>, where,

[0241] The pump in question is a flow rate pump that takes priority over pressure.

[0242] Explanation of reference numerals in the attached figures

[0243] 10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10I, 10J, 10K, 10L, 10M, 10N: Gas concentration detection device; 21, Controller; 31, Gas balancer; 32, Pump; 33, Gas state detection sensor; 34, Gas concentration sensor; 35, 35A, 35G, 35H, 35K: Dehumidifier; 40, Power supply; 50, Operating device; 60, Battery; 70, 70M, 70N: Communication module; 79, Housing; 80, Data logger; 100, 100J, 100L, 100N: Housing; 110, Internal space; 210, Storage medium; 300, Circulation flow. Path; 301, 301I, Pipe 1; 302, Pipe 2; 303, Pipe 3; 304, 304B, Pipe 4; 305, Pipe 5; 306, 306I, 306L, 306N, Pipe 6; 307, 307I, 307L, 307N, Pipe 7; 311, Hollow fiber membrane; 312, First connecting member; 313, Second connecting member; 400, 600, Power cable; 211, 500, 700, 800, Communication cable; P31i, Inlet; P31o, Outlet; P32i, Suction port; P32o, Spray port; P34i, First port; P34o, Second port; S301, S311, Flow path cross-sectional area.

Claims

1. A gas concentration detection device, wherein, This gas concentration detection device has the following features: A gas balancer has a first cylinder that allows the target component, which is a gas, to pass through but not water. The gas balancer can balance the concentration of the target component between the internal space of the first cylinder and the water outside. A pump that generates airflow in the internal space; A gas concentration sensor that detects the concentration of the component to be detected; and Multiple second cylinders, each consisting of a cylindrical wall that prevents gas and moisture from passing through. By connecting the internal space of the first cylinder with the plurality of second cylinders, the pump, and the gas concentration sensor, a circulating flow path capable of supplying gas circulation within the flow path is formed. The pump is located downstream of the gas balancer in the circulation path.

2. The gas concentration detection device according to claim 1, wherein, The gas balancer has an inlet located upstream of the circulation path and an outlet located downstream of the circulation path. The pump has a suction inlet located upstream of the circulation path and a discharge outlet located downstream of the circulation path. The gas concentration sensor has a first port located upstream of the circulation path and a second port located downstream of the circulation path. The outlet of the gas balancer is connected to the inlet of the pump. The pump's outlet is connected to the first port of the gas concentration sensor. The second port of the gas concentration sensor is connected to the inlet of the gas balancer.

3. The gas concentration detection device according to claim 1 or 2, wherein, The flow path cross-sectional area of ​​the second cylinder is smaller than that of the first cylinder of the gas balancer.

4. The gas concentration detection device according to any one of claims 1 to 3, wherein, The gas concentration detection device includes a gas state detection sensor that detects at least one of the temperature, humidity, and gas pressure of the gas in the flow path. The gas state detection sensor is connected to the circulation path.

5. The gas concentration detection device according to any one of claims 1 to 4, wherein, The gas concentration detection device includes a dehumidifier for dehumidifying the gas in the flow path.

6. The gas concentration detection device according to claim 5, wherein, The dehumidifier consists of a third cylinder that prevents gas and moisture from passing through and a dehumidifier contained within the third cylinder.

7. The gas concentration detection device according to claim 5 or 6, wherein, The dehumidifier is connected between the second port of the gas concentration sensor and the inlet of the gas balancer.

8. The gas concentration detection device according to any one of claims 1 to 4, wherein, The gas concentration detection device is equipped with a dehumidifying membrane for dehumidifying the gas in the flow path.

9. The gas concentration detection device according to claim 8, wherein, The dehumidifying membrane is installed along the inner wall surface of the second cylinder.

10. The gas concentration detection device according to any one of claims 1 to 9, wherein, The gas concentration detection device has a housing that integrates the pump, the gas concentration sensor, and a portion of the second cylinder. The shell is made of a material with a lower thermal conductivity than water.

11. The gas concentration detection device according to any one of claims 1 to 9, wherein, The gas concentration detection device has a housing that integrates the pump, the gas concentration sensor, and a portion of the second cylinder. A heater is located inside the housing.

12. The gas concentration detection device according to any one of claims 1 to 9, wherein, The gas concentration detection device has a housing that integrates the pump, the gas concentration sensor, and a portion of the second cylinder. The housing has a mechanism for receiving external light.

13. The gas concentration detection device according to claim 5 or 6, wherein, The gas concentration detection device has a housing that integrates the pump, the gas concentration sensor, and the dehumidifier.

14. The gas concentration detection device according to any one of claims 1 to 13, wherein, The cross-sectional area of ​​the flow path of the second cylinder, from the gas balancer to the pump, is smaller than the cross-sectional area of ​​the flow path of the gas balancer.

15. The gas concentration detection device according to any one of claims 1 to 14, wherein, The component to be detected is carbon dioxide. The gas concentration sensor detects the concentration of carbon dioxide in the gas within the flow path.

16. The gas concentration detection device according to any one of claims 1 to 15, wherein, The distance from the gas balancer to the pump in the circulation path is shorter than the distance from the pump to the gas balancer in the circulation path.

17. The gas concentration detection device according to any one of claims 1 to 16, wherein, The pump in question is a flow rate pump that takes priority over pressure.

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