JP5409185B2 - Air salinity measuring method and measuring system - Google Patents

Description

  The present invention relates to an air salinity measurement method and measurement system. More specifically, the present invention relates to an air salinity measurement method and a measurement system for dissolving salinity in the atmosphere in pure water and measuring the salinity in the atmosphere from a measured value of electric conductivity of the pure water.

  As a conventional technique for measuring the salinity in the atmosphere, an air salinity measuring method described in Patent Document 1 is known. This air salinity measuring method is carried out using an air salinity meter shown in FIG. Specifically, an outside air introduction pipe 103 for introducing outside air into the container 101 and a pure water suction pipe 104 for sucking up the pure water 102 in the container 101 into a sealed container 101 in which a certain amount of pure water 102 is sealed. Mist 110 is generated in the container 101 by the outside air injected from the nozzle 103 a provided at the tip of the outside air introduction pipe 103 and the pure water 102 in the container 101 sucked up by the pure water suction pipe 104. A fog spray device 105 is provided. Then, by removing the air in the container 101 from the exhaust port 106 provided in the container 101 by an exhaust pump, the container 101 is brought to a negative pressure, and the outside air to be measured is introduced into the container 101 from the outside air introduction pipe 103 and pure water is sucked. The pipe 104 sucks up the pure water 102 in the container, generates a mist 110 from the mist blowing device 105 so as to collide with the inner wall of the container 101, and dissolves the salt contained in the outside air to be measured in the pure water 102 in the container 101, The salinity of the outside air to be measured is measured from the measured value of electric conductivity in the pure water 102 in the container 101 (measured by the electrode 112). The air salinity meter shown in FIG. 9 includes a pure water tank 107, a water absorption electromagnetic valve 108, a drain electromagnetic valve 109, and pure water as a mechanism for exchanging the pure water 102 in the container 101 at regular intervals. A water level sensor 111 for determining a certain amount is provided.

Japanese Patent Publication 5-8982

  However, the air salinity measurement method described in Patent Document 1 cannot be said to have sufficient measurement accuracy, and there is a problem in that highly reliable data cannot be obtained.

  In addition, the air salinity measurement method described in Patent Document 1 is based on the premise that the pure water 102 in the container 101 is replaced at regular intervals, and the entire amount of pure water in the container 101 is replaced for each measurement. . In recent years, it has been required to continuously measure air salinity over a long period of 1 to 2 months or more, and such a method capable of continuously measuring salinity over a long period of time. Establishment of is desired.

  Then, an object of this invention is to provide the air salinity measuring method and measuring system which can measure the salinity contained in to-be-measured external air accurately.

  The present invention also provides an air salinity measurement method and measurement system that can accurately measure the salinity contained in the outside air to be measured and that can continuously measure over a long period of time. Objective.

  As a result of intensive studies by the inventors of the present application in order to solve such a problem, in the conventional air salinity measurement method as described in Patent Document 1, the mist 110 containing the salt generated in the mist blowing device 105 is generated. It was found that the exhaust was exhausted by the exhaust pump, and this was a fundamental factor that lowered the measurement accuracy.

  Further, in the conventional air salinity measuring method as described in Patent Document 1, the nozzle 103a of the outside air introduction tube 103 is clogged with dust or salt crystals, and the injection of outside air from the nozzle 103a is hindered. It has been found that the fog 110 may be difficult to occur. It has also been found that solid matter such as insects enters the outside air introduction tube 103 and clogs the vicinity of the nozzle 103a, thereby inhibiting the injection of outside air from the nozzle 103a and making it difficult to generate the mist 110. . In other words, it has been found that the clogging of the nozzle 103a of the outside air introduction tube 103 can also be a factor that impedes the injection of the outside air to be measured and reduces the measurement accuracy.

  On the other hand, the inventors of the present application have examined whether the salinity measurement can be continuously performed over a long period of 1 to 2 months or more by the air salinity measurement method described in Patent Document 1. Went. As a result, it occurs in the conventional method which is based on the premise that the pure water 102 in the container 101 is replaced every predetermined time, for example, every 5 to 6 hours, and the entire amount of the pure water 102 in the container 101 is replaced for every measurement. The problem that was not obtained became clear. That is, when the measurement period exceeds one day, in addition to the mist 110 being exhausted by the exhaust pump, the pure water 102 in the container 101 is evaporated and the amount thereof is reduced, and the mist 110 can be generated. It turned out to be gone.

  Therefore, the inventors of the present application provide a pure water tank 107, a water absorption electromagnetic valve 108, and a water level sensor 111 for determining a constant amount of pure water, which are mechanisms for exchanging the pure water 102 in the container 101 at regular intervals. By using this, the water level sensor 111 detects that the amount of pure water 102 in the container 101 has decreased, and the water absorption electromagnetic valve 108 is operated to replenish the pure water 102 from the pure water tank 107. The experiment was carried out on the assumption that continuous salinity measurement could be carried out. However, in this case, it has been found that the problem of the clogging of the nozzle 103a of the outside air introduction pipe 103 becomes more remarkable.

  Therefore, the inventors of the present application have repeatedly studied to improve the measurement accuracy than before, and have adopted the new method different from the conventional method for generating fog that is easily exhausted, thereby solving the above-mentioned problems. As a result, the present invention has been completed.

That is, the air salinity measuring method according to claim 1 is an air salinity measuring method for measuring the salinity contained in the outside air to be measured, and the outside air having both ends opened in a sealed container containing pure water. The inlet tube is inserted, the opening located outside the sealed container is used as the outside air suction part, and the opening located inside the sealed container is used as the outside air discharge part, and the outside air discharge part does not come into contact with the pure water in the sealed container. A filter member is provided in the outside air introduction pipe, and pure water in the sealed container is supplied to a position between the outside air suction part and the filter member in the outside air introduction pipe, and the pure water is supplied to the outside air discharge part. By circulating, the pure water in the sealed container circulates in the outside air introduction pipe and forms a pure water circulation path that returns from the outside air discharge part to the sealed container again, while exhausting the inside of the sealed container to measure Solid matter contained in the outside air is removed with a filter member While the outside air measured by the outside air suction portion of the outside air introducing pipe is circulated toward the ambient air discharging unit, salt contained in the outside air to be measured in pure water flowing through the external air introduction pipe, the measured outside air from adhering to the filter member The salinity and the salinity derived from the outside air to be measured adhering to the wall surface of the outside air introduction pipe are dissolved, and the salinity contained in the outside air to be measured is measured from the measured value of the electric conductivity of pure water in the sealed container.

The air salinity measuring system according to claim 3 is an air salinity measuring system for measuring the salinity contained in the outside air to be measured, which is a sealed container containing pure water, and a pipe having both ends open. The opening that is inserted into the sealed container and located outside the sealed container is used as an outside air suction part, and the opening that is located inside the sealed container is used as an outside air discharge part, and the outside air discharge part is pure water in the sealed container. The outside air introduction pipe arranged at a position not in contact with the air, the exhaust device for exhausting the inside of the sealed container, the filter member provided in the outside air introduction pipe, and the first pipe whose one end is in contact with the pure water in the sealed container A second pipe having one end connected to a position between the outside air suction part of the outside air introduction pipe and the filter member, a liquid feed pump connecting the other end of the first pipe and the other end of the second pipe, A measuring device that measures the electrical conductivity of pure water in a sealed container Pure water circulation in which the deionized water in the sealed container circulates in the order of the first pipe, the second pipe, and the outside air introduction pipe and returns to the sealed container again from the outside air discharge section by operating the liquid pump. While the passage is formed, the measured air is circulated from the outside air suction part to the outside air discharge part of the outside air introduction pipe while the solid matter contained in the outside air to be measured is removed by the filter member by operating the exhaust device. Let the salt contained in the measured outside air in the pure water flowing through the outside air introducing pipe, the salt derived from the measured outside air attached to the filter member and the salt derived from the measured outside air attached to the wall surface of the outside air introducing pipe , The salinity of the outside air to be measured is measured from the measured value of the electrical conductivity of pure water in the sealed container obtained by the measuring device.

  Therefore, according to the air salinity measuring method according to claim 1 and the air salinity measuring system according to claim 3, the pure water in the sealed container is placed at a position between the outside air suction part and the filter member in the outside air introduction pipe. Since the pure water is circulated through the outside air introduction pipe, the salt contained in the measured outside air flowing through the outside air introduction pipe can be dissolved in the pure water. Since pure water in which salt is dissolved flows down or drops from the outside air discharge part of the outside air introduction pipe, it is more than the mist generated by contacting the air to be measured and pure water as in the conventional air salinity measurement method. It becomes difficult to be exhausted. In addition, while removing solids contained in the measured outside air by the filter member provided in the outside air introduction pipe, the outside air to be measured is introduced into the sealed container, and between the outside air suction part in the outside air introduction pipe and the filter member. Since the pure water in the sealed container is supplied to the position, the dirt and salt derived from the outside air to be measured captured by the filter member are dissolved in the pure water and removed from the filter member. The clogging of the outside air introduction pipe due to will not occur. Moreover, the salt content derived from the outside air to be measured can be dissolved in pure water and used for the measurement. Furthermore, it is possible to avoid a trouble that solid matter such as insects enters the sealed container and the piping is blocked by the filter member provided in the outside air introduction pipe.

  Here, in the air salinity measurement method according to claim 1, when the amount of pure water in the sealed container is reduced as described in claim 2, the outside air suction part and the filter member in the outside air introduction pipe are It is preferable to supply pure water into the sealed container by supplying pure water to a position between the two. Further, in the air salinity measurement system according to claim 3, as described in claim 4, a pure water storage tank for storing pure water and a supply source of pure water to the outside air introduction pipe are provided from inside the sealed container. Switching means for switching to the deionized water storage tank, and when the amount of pure water in the sealed container falls below a specified value, the switching means is operated to switch the pure water supply source to the deionized water storage tank and to store the deionized water in the sealed container It is preferable to include control means for operating the switching means to switch the source of pure water into the sealed container when the amount of water is greater than or equal to the specified value. In this case, when the amount of pure water in the sealed container is reduced, it is possible to replenish pure water from the pure water storage tank. Therefore, the amount of pure water in the sealed container is kept constant over a long period of time. be able to. Moreover, it is possible to replenish pure water into the sealed container through the outside air introduction pipe without stopping the introduction of the measured outside air from the outside air introduction pipe into the sealed container. It is possible to replenish pure water while continuing.

  Further, in the air salinity measurement system according to claim 3, as described in claim 5, a pipe having a smaller outer diameter than the outside air introduction pipe is arranged in parallel between the filter member of the outside air introduction pipe and the outside air discharge portion. It is preferable that a plurality of them are provided. In this case, when the measured outside air and pure water flow through a plurality of tubes having an outer diameter smaller than that of the outside air introduction pipe, the contact area between the measured outside air and pure water increases and is included in the measured outside air. Salinity easily dissolves in pure water.

  Furthermore, in the air salinity measurement system according to claim 3, as described in claim 6, an annular member having a reverse funnel shape whose inner diameter is gradually reduced from the lower end toward the upper end surrounds the outside air discharge portion. It is preferable to be provided in the outside air introduction pipe or to be provided in the outside air introduction pipe so as to connect the upper end of the outside air introduction pipe. In this case, it is possible to reliably prevent the pure water containing salt dripping from the outside air discharge portion of the outside air introduction pipe from being exhausted by the exhaust device.

Further, in the air salinity measurement system according to claim 3, as described in claim 7, the air salinity measurement system includes a compressor that supplies compressed gas into the sealed container, stops the exhaust device, and supplies compressed gas from the compressor The compressed gas is supplied from the outside air discharge part to the outside air suction part by supplying it into the sealed container, and the adhering matter blocking the filter member and the solid matter accumulated on the filter member are sucked into the outside air from the outside air introduction pipe. It is preferable to discharge from the part. In this case, the deposits blocking the filter member and the solid matter deposited on the filter member, which are factors that hinder the introduction of the measured outside air from the outside air introduction pipe into the sealed container, are periodically or It can be optionally removed, and the introduction of the outside air to be measured from the outside air introduction pipe into the sealed container can be kept good for a long time. In addition, when exchanging pure water in the sealed container, it is preferable to supply the compressed gas from the compressor to the pure water in the sealed container and perform bubbling to clean the inner wall of the sealed container.

  According to the air salinity measuring method according to claim 1 and the air salinity measuring system according to claim 3, the pure water in the sealed container is placed at a position between the outside air suction part and the filter member in the outside air introduction pipe. Since the pure water is supplied and circulated in the outside air introduction pipe, the salt contained in the measured outside air flowing through the outside air introduction pipe can be dissolved in the pure water. Since pure water in which salt is dissolved flows down or drops from the outside air discharge part of the outside air introduction pipe, it is more than the mist generated by contacting the air to be measured and pure water as in the conventional air salinity measurement method. It becomes difficult to be exhausted. Therefore, measurement accuracy can be improved as compared with the conventional air salinity measurement method. In addition, while removing solids contained in the measured outside air by the filter member provided in the outside air introduction pipe, the outside air to be measured is introduced into the sealed container, and between the outside air suction part in the outside air introduction pipe and the filter member. Since the pure water in the sealed container is supplied to the position, dirt and salt derived from the measured outside air trapped in the filter member are dissolved in the pure water and removed from the filter member. The inlet pipe is not clogged. In addition, the salt content derived from the outside air to be measured can be dissolved in pure water for measurement, so that the salt content in the outside air to be measured can be measured without any excess, improving measurement accuracy over conventional air salinity measurement methods. Can be made. Furthermore, it is possible to avoid a trouble that solid matter such as insects enters the sealed container and the piping is blocked by the filter member provided in the outside air introduction pipe.

  According to the air salinity measurement method according to claim 2 and the air salinity measurement system according to claim 4, when pure water in the sealed container is reduced, pure water is replenished from the pure water storage tank. Therefore, the amount of pure water in the sealed container can be kept constant for a long time. Moreover, it is possible to replenish pure water into the sealed container through the outside air introduction pipe without stopping the introduction of the measured outside air from the outside air introduction pipe into the sealed container. It is possible to replenish pure water while continuing. Therefore, air salinity measurement can be continuously performed over a long period of time.

  According to the air salinity measuring system according to claim 5, the measured outside air and pure water are circulated through a plurality of tubes having an outer diameter smaller than that of the outside air introduction pipe, whereby the measured outside air and pure water are The contact area increases and the salt contained in the outside air to be measured is easily dissolved in pure water. Therefore, even if the length of the outside air introduction pipe is shortened, the salt contained in the outside air to be measured is sufficiently dissolved in the pure water, so the length of the outside air introduction pipe is shortened and the overall system configuration is compact. It becomes possible.

  According to the air salinity measurement system of the sixth aspect, it is possible to reliably prevent the pure water containing salt dripped from the outside air discharge portion of the outside air introduction pipe from being exhausted by the exhaust device. Therefore, the measurement accuracy can be greatly improved as compared with the conventional air salinity measurement method.

  According to the air salinity measuring system according to claim 7, in this case, the adhering matter blocking the filter member, which is a factor that hinders introduction of the measured outside air from the outside air introduction pipe into the sealed container, and The solid matter accumulated on the filter member can be removed periodically or voluntarily, and the state of introduction of the measured outside air from the outside air introduction pipe into the sealed container can be maintained for a long time. Become.

It is a figure which shows an example of embodiment in the case of measuring air salinity by the air salinity measuring system of this invention. It is a figure which shows an example of embodiment in the case of supplying water in an airtight container, measuring air salinity by the air salinity measuring system of this invention. It is a figure which shows an example of embodiment in the case of removing clogging of a filter member by the air salinity measuring system of this invention. In the air salinity measurement system of this invention, it is a figure which shows an example of embodiment in the case of replacing | exchanging the pure water in an airtight container. It is a figure which shows an example of the form of the filter member in this embodiment. In this embodiment, it is a figure which shows an example of the form of the contact tube with which an external air introduction pipe is equipped. It is a figure which shows the comparison experiment result of the gauze method in a comparative example, and the air salinity measuring system shown in FIG. It is a figure which shows the recovery rate (collection efficiency) at the time of using the air salinity measuring system of this invention. It is a figure which shows the conventional air salinity measurement system.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  The air salinity measurement method of the present invention is an air salinity measurement method for measuring the salinity contained in the outside air to be measured, and an air introduction pipe having both ends opened is inserted into a sealed container containing pure water, The opening located outside the sealed container is used as an outside air suction part and the opening located inside the sealed container is used as an outside air discharge part, and the outside air discharge part is arranged at a position where it does not come into contact with pure water in the sealed container, By providing a filter member in the outside air introduction pipe, supplying pure water in the sealed container to a position between the outside air suction part and the filter member in the outside air introduction pipe, and circulating the pure water toward the outside air discharge part, The pure water in the sealed container circulates in the outside air introduction pipe and forms a pure water circulation path that returns from the outside air discharge part back into the sealed container. On the other hand, by exhausting the inside of the sealed container, solids contained in the measured outside air Measured while removing objects with filter member Air is circulated from the outside air suction part of the outside air introduction pipe to the outside air discharge part, so that the salt contained in the measured outside air is dissolved in the pure water flowing through the outside air introduction pipe, and the electric conductivity of the pure water in the sealed container The salinity contained in the outside air to be measured is measured from the measured value.

  The air salinity measurement method of the present invention is implemented, for example, by an air salinity measurement system shown in FIGS. The air salinity measurement system 1 according to the present embodiment includes a sealed container 2 containing pure water, and a pipe that is open at both ends and is inserted into the sealed container 2 and located outside the sealed container 2. The outside air suction part 3a and the opening located inside the sealed container 2 are used as the outside air discharge part 3b, and the outside air discharge part 3b is disposed outside the sealed container 2 so as not to come into contact with the pure water. The exhaust device 4 for exhausting the inside of the sealed container 2, the filter member 5 provided in the outside air introduction pipe 3, the first pipe 6 whose one end is in contact with the pure water in the sealed container 2, and the outside air introduction pipe 3 A second pipe 7 having one end connected to a position between the outside air suction part 3a and the filter member 5, and a liquid feed pump 8 connecting the other end of the first pipe 6 and the other end of the second pipe 7. And a measuring device 12 for measuring the electrical conductivity of pure water in the sealed container 2 at least. In addition, by operating the liquid feed pump 8, the pure water in the sealed container 2 flows in the order of the first pipe 6, the second pipe 7 and the outside air introduction pipe 3, and again enters the sealed container 2 from the outside air discharge part 3b. On the other hand, the pure water circulation path is formed, while the exhaust device 4 is operated, so that the solid matter contained in the measured outside air is removed by the filter member 5 and the measured outside air is removed from the outside air introduction pipe 3. The salt water contained in the outside air to be measured is dissolved in the pure water flowing through the outside air introduction pipe 3 from the 3a to the outside air discharge section 3b. The salinity of the outside air to be measured is measured from the measured conductivity value. In FIGS. 1 to 4, when the valve (or electromagnetic valve) is black, it means that the valve is closed, and when it is not black, it means that the valve is open.

  The sealed container 2 may be made of a material that is unlikely to be corroded by pure water in which salt is dissolved, for example, a glass container, but is not limited thereto.

  The sealed container 2 contains pure water. Pure water is water that does not substantially contain an amount of metal ions or the like that affects the measurement of salinity by electrical conductivity. For example, distilled water or the like can be used.

  The outside air introduction tube 3 is a tube that is open at both ends. The “tube” referred to here includes not only a tube whose shape is fixed, such as a glass tube, but also a flexible tube.

  The outside air introduction pipe 3 is inserted into the sealed container 2, and an opening located outside the sealed container 2 is an outside air suction part 3 a, and an opening located inside the sealed container 2 is an outside air discharge part 3 b. In addition, regarding the vertical relationship between the positions of the outside air suction unit 3a and the outside air discharge unit 3b, the outside air suction unit 3a is disposed above the outside air discharge unit 3b so that a part of pure water flows down from the outside air suction unit 3a. I try to prevent it. In this embodiment, the outside air suction part 3a is arranged above the outside air discharge part 3b and is substantially perpendicular to the surface of the pure water in the sealed container 2, so that pure water supplied to the outside air introduction pipe 3a is outside air. It is made to flow down or drop from the discharge part 3b. However, the vertical relationship between the positions of the outside air suction part 3a and the outside air discharge part 3b is not limited to this form. For example, the outside air suction part 3a has the same height as the outside air discharge part 3b or the outside air suction part 3a. Is disposed below the outside air discharge portion 3b, the outside air introduction tube 3 is bent in the vicinity of the outside air suction portion 3a, and the outside air suction portion 3a is opened upward. While preventing the water from flowing down, the pure water can be circulated in the outside air introduction pipe 3 by the liquid feeding force of the liquid feeding pump 8.

  In the present embodiment, the outside air discharge portion 3b of the outside air introduction pipe 3 (the end surface inside the outside container of the outside air introduction pipe 3) is arranged at a position that does not come into contact with the pure water in the inside container 2. . As a result, the measured outside air is discharged from the outside air discharge portion 3 b, and the measured outside air can be introduced into the sealed container 2. The distance between the outside air discharge unit 3b and the surface of the pure water in the sealed container 2 is a distance at which splashing hardly occurs from the water surface when pure water containing salt flows down or drops from the outside air discharge unit 3b. Is preferred. Thereby, the fall of the measurement accuracy by the splash from a water surface being exhausted by the exhaust apparatus 4 can be suppressed.

  Here, in the air salinity measuring system according to the present invention, pure water containing salt is allowed to flow down or dripped as it is from the outside air discharge part 3b of the outside air introduction pipe 3, thereby reducing the fog generated in the conventional air salinity measuring method. The pure water containing salt can hardly be exhausted, and the measurement accuracy can be improved. However, as in this embodiment, the reverse funnel-shaped annular member 13 that gradually reduces the inner diameter from the lower end toward the upper end is provided. It is more preferable that the outside air introduction pipe 3 is provided so as to surround the outside air discharge part 3b and that pure water containing salt dripping from the outside air discharge part 3b of the outside air introduction pipe 3 flows down along the inner wall. Although most of the pure water containing salt discharged from the outside air discharge unit 3b flows down, a part of the pure water drops in the form of drops. Pure water dropped in the form of droplets is easily exhausted by the exhaust device 4. Therefore, by attaching the annular member 13 to the outside air discharge portion 3b of the outside air introduction pipe 3, when the pure water that drops and drops is exhausted, the pure water collides with the inner wall of the annular member 13. Can do. Here, since the annular member 13 has a reverse funnel shape in which the inner diameter gradually decreases from the lower end 13b toward the upper end 13a, the pure water trough colliding with the inner wall flows down to the surface of the pure water in the sealed container 2. . Therefore, pure water containing salt discharged from the outside air discharge unit 3 b is collected in the sealed container 2 without being exhausted by the exhaust device 4. Moreover, you may make it the annular member 13 be provided in the external air introduction pipe | tube 3 so that the upper end and the external air discharge part 3b may be connected. In this case, pure water containing salt discharged from the outside air discharge portion 3b flows down along the inner wall of the annular member 13, so that the pure water discharged from the outside air discharge portion 3b becomes droplets and hardly drops. Pure water can be prevented from being exhausted. In addition, the outside air to be measured is easily discharged from the outside air discharge unit 3b. In addition, the lower end of the annular member 13 is disposed at a position where it does not come into contact with the pure water in the sealed container 2, and is disposed at a distance at which it is difficult for the pure water flowing from the lower end to splash from the surface of the pure water in the sealed container 2. It is preferable to do.

  In the present embodiment, a filter member 5 is provided in the outside air introduction tube 3. The filter member 5 can circulate the measured outside air toward the outside air discharge part 3b while removing solids contained in the measured outside air. Therefore, it is possible to prevent the outside air discharge unit 3b from being clogged with dirt or salt crystals, or a solid matter such as insects from entering the sealed container 2 to close the piping or the like, thereby causing the air salinity measurement system to fail. .

  In this embodiment, as shown in FIG. 5, the filter member 5 is provided with a filter member 5 in a cylindrical casing, and provided with pipes at openings at substantially central portions at both ends of the casing. Although the pipe is connected to the outside air introduction pipe 3, the filter member may of course be provided directly in the outside air introduction pipe 3.

  The filter member 5 may be, for example, a mesh material having a mesh size of 0.1 mm to 1.0 mm, preferably about 0.8 mm, but the outside air to be measured while removing solids contained in the outside air to be measured. As long as it does not impede the introduction into the sealed container 2, it is not limited to this. The solid matter contained in the outside air to be measured is, for example, dust such as dust, salt, insects, and the like.

  One end of a second pipe 7 is connected to the outside air introduction pipe 3 at a position between the outside air suction part 3 a and the filter member 5. The other end of the second pipe 7 is connected to the liquid feed pump 8. Further, one end of the first pipe 6 is brought into contact with the pure water in the sealed container 2, and the other end is connected to the liquid feed pump 8.

  When the liquid feed pump 8 is operated, the pure water in the sealed container 2 is supplied to the position between the outside air suction part 3a in the outside air introduction pipe 3 and the filter member 5 through the first pipe 6 and the second pipe 7. Is done. Then, the pure water supplied to the outside air introduction pipe 3 flows down or drops from the outside air discharge part 3b and returns to the sealed container 2 again. That is, in the air salinity measurement system of the present invention, a pure water circulation path is formed in which pure water in the sealed container 2 returns to the sealed container 2 again through the outside air introduction pipe 3.

  When the exhaust device 4 is operated, the measured outside air flows from the outside air suction part 3a of the outside air introduction pipe 3 toward the outside air discharge part 3b. The measured outside air flowing through the outside air introduction pipe 3 comes into contact with the pure water supplied to the outside air introduction pipe 3, and the salt contained in the outside air to be measured is dissolved in this pure water. Here, when the measured outside air is circulated from the outside air suction part 3 a of the outside air introduction pipe 3 toward the outside air discharge part 3 b, salt contained in the measured outside air may adhere to the filter member 5. In the present embodiment, since the pure water in the sealed container 2 is supplied to a position between the outside air suction part 3a and the filter member 5 in the outside air introduction pipe 3, the measured outside air adhering to the filter member 5 is provided. The derived salt can be recovered by dissolving in pure water. Further, the salt content derived from the outside air to be measured attached to the wall surface of the outside air introduction pipe 3 can also be dissolved in pure water and recovered. Therefore, it is easy to recover the salt contained in the outside air to be measured by dissolving it in pure water without leakage.

  Note that a suction pump or the like can be used for the exhaust device 4, for example. In the present embodiment, the abnormality detection tank 40 is provided, and the inside of the sealed container 2 is exhausted through the abnormality detection tank 40. Thereby, when the pure water in the sealed container 2 continues to increase to a specified value or more, the pure water in the sealed container 2 is sent to the abnormality detection tank 40 and sent to the abnormality detection tank 40. When the liquid level of pure water touches the liquid level meter 41, an alarm can be issued. However, it is not always necessary to provide the abnormality detection tank 40, and the inside of the sealed container 2 may be directly exhausted by the exhaust device 4.

  Here, the dissolution of the salt contained in the outside air to be measured into the pure water is more likely to occur as the contact time between the outside air to be measured and the pure water is longer. Therefore, it is preferable to make the distance from the pure water supply position of the outside air introduction pipe 3 (the connection part between the second pipe 7 and the outside air introduction pipe 3) to the outside air discharge part 3b as long as possible. For example, by forming a spiral from the pure water supply position of the outside air introduction pipe 3 (connection portion between the second pipe 7 and the outside air introduction pipe 3) to the outside air discharge part 3b, the outside air to be measured can be made compact while having a compact configuration. The contained salt can be easily dissolved in pure water.

  Further, the dissolution of salt contained in the outside air to be measured into the pure water is more likely to occur as the contact area between the outside air to be measured and the pure water increases. Therefore, it is preferable that a plurality of tubes 10a having a smaller outer diameter than the outside air introduction tube 3 are provided in parallel between the filter member 5 of the outside air introduction tube 3 and the outside air discharge portion 3b. As a result, the outside air to be measured and pure water flow into and come into contact with the plurality of tubes 10a, respectively, and the contact area between the outside air to be measured and pure water is improved as compared with the outside air introduction pipe 3 having the same length. be able to. Therefore, the salt contained in the measured outside air can be easily dissolved in pure water.

  In this embodiment, the contact tube 10 shown in FIG. 5 is provided between the filter member 5 of the outside air introduction tube 3 and the outside air discharge part 3b. The contact tube 10 is configured as follows. That is, a plurality of thin tubes 10b, which are shorter than the height of the casing 10a and smaller in outer diameter than the inner diameter of the casing 10a, are arranged in parallel in a cylindrical casing 10a that is open at substantially the center of both ends. Filled. A partition plate 10c having a plurality of holes is provided at both ends of the thin tubes 10b filled in parallel in the housing 10a. Here, gaps 10d and 10e are provided between the partition plate 10c and both ends of the casing 10a, and the pure water and the outside air to be measured flowing into the casing 10a spread in the gap 10d and then flow into the narrow tube 10b. At the same time, the pure water and the outside air to be measured flowing out from the narrow tube 10b are discharged after being discharged into the gap 10e. And the pipe | tubes 10f and 10g are connected to the opening part of the both ends of the housing | casing 10a, and it can be connected in the external air introduction pipe | tube 3. FIG. By configuring in this way, pure water and the outside air to be measured easily flow into all of the plurality of thin tubes 10b, and salt contained in the outside air to be measured is easily dissolved in the pure water inside the thin tubes 10b, and the distance is short. However, the salt contained in the outside air to be measured can be easily dissolved in pure water. Therefore, the configuration of the entire system can be made compact without increasing the length of the outside air introduction tube 3.

  The electric conductivity of pure water in the sealed container 2 is measured by an electric conductivity measuring device 12 (for example, an electric conductivity meter manufactured by Toa DKK Co., Ltd.) through an electrode immersed in pure water, and is a data logger. The measured value is recorded by. Then, based on the relationship between the amount of salt dissolved in pure water and the electrical conductivity determined in advance from the measured value of electrical conductivity, the amount of salt dissolved in pure water, that is, the amount of salt contained in the outside air to be measured. The amount can be determined.

  As described above, in the air salinity measurement system shown in FIG. 1, the exhaust device 4 is operated to exhaust the inside of the sealed container 2, and the measured outside air flows from the outside air suction part 3 a to the outside air discharge part 3 b of the outside air introduction pipe 3. doing. On the other hand, the liquid feed pump 8 is also operating, and the pure water in the sealed container 2 returns again into the sealed container 2 through the outside air introduction pipe 3. That is, a pure water circulation path is formed. Therefore, in the outside air introduction pipe 3 and the contact pipe 10, the outside air to be measured and the pure water are circulated and contacted at the same time, and the salt contained in the outside air to be measured is dissolved in the pure water and returned to the sealed container 2. Then, the amount of salt contained in the outside air to be measured is measured from the measured value of the electrical conductivity of pure water in the sealed container 2.

  Here, in the present embodiment, as shown in FIG. 2, when the amount of pure water in the sealed container 2 is reduced, the pure water in the outside air introduction pipe 3 is placed at a position between the outside air suction portion 3 a and the filter member 5. Pure water is supplied into the sealed container 2 by supplying pure water. Specifically, the pure water storage tank 16 for storing pure water, the switching means 17 for switching the supply source of pure water to the outside air introduction pipe 3 from the sealed container 2 to the pure water storage tank 16, and the sealed container 2 When the amount of pure water falls below the specified value, the switching means 17 is operated to switch the pure water supply source to the pure water storage tank 16, and when the amount of pure water in the sealed container 2 is greater than the specified value, the switching means. The control means 18 which operates 17 and switches the supply source of a pure water in the airtight container 2 shall be provided.

  In the present embodiment, one end of the third pipe 19 is connected to the side surface of the first pipe 6 and the other end is brought into contact with the pure water in the pure water storage tank 16. The connecting part between the first pipe 6 and the third pipe 19 is provided with an electromagnetic valve 17a as the switching means 17, and the connecting part between the first pipe 6 and the third pipe 19 of the first container 6 and the sealed container 2 The electromagnetic valve 17b is provided between the electromagnetic valve 17b and the third pipe 19. When the liquid level sensor 20 provided in the sealed container 2 detects that the amount of pure water in the sealed container 2 has decreased below the specified value, a signal is sent to the control means 18, and the control means 18 is connected to the electromagnetic valve 17 a, 17 b and 17 c are operated to switch the pure water supply source to the pure water storage tank 16. That is, the solenoid valve 17b is closed, the solenoid valve 17c is opened, and the solenoid valve 17a is operated so that pure water can be supplied from the pure water storage tank 16 to the liquid feed pump 8. The flow path of pure water to 8 is blocked, and the flow path of pure water from the pure water storage tank 16 to the liquid feed pump 8 is secured. In addition, by connecting the 3rd piping 19 to the side surface of the 1st piping 6, the liquid pump 8 can pump up the pure water from the pure water storage tank 16. FIG. That is, since the liquid feed pump 8 can be used to pump both pure water in the sealed container 2 and pure water in the pure water storage tank 16, the system can be made compact and the cost can be reduced. However, pure water is supplied from the pure water storage tank 16 to the second pipe 7 by a liquid feed pump different from the liquid feed pump 8, or between the outside air suction part 3 a of the outside air introduction pipe 3 and the filter member 5. It is also possible to supply pure water directly to the position. When the liquid level sensor 20 provided in the sealed container 2 detects that the amount of pure water in the sealed container 2 is equal to or greater than a specified value, a signal is sent to the control means 18 and the control means 18 17 is operated to switch the supply source of pure water into the sealed container 2. That is, the electromagnetic valve 17b is opened, the electromagnetic valve 17c is closed, and the electromagnetic valve 17a is operated so that pure water can be supplied from the sealed container 2 to the liquid feed pump 8, whereby the liquid feed pump 8 from the sealed container 2 is supplied. The pure water flow path from the pure water storage tank 16 to the liquid feed pump 8 is blocked.

  In the present embodiment, the switching means 17 includes the three electromagnetic valves 17a, 17b and 17c. However, it is possible to switch the supply source of pure water using only the electromagnetic valve 17a. The solenoid valves 17b and 17c may be omitted. Moreover, since it is possible to switch the supply source of the solenoid valves 17b and 17c pure water, the solenoid valve 17a may be omitted.

  Further, in the present embodiment, the pure water storage tank 16 is provided with the liquid level sensors 42 and 43, and the amount of pure water in the pure water storage tank 16 decreases and the water level is higher than the tip (lower end) of the liquid level sensor 42. When pure water is reduced, pure water is replenished into the pure water storage tank 16, and when pure water comes into contact with the tip (lower end) of the liquid level sensor 43, replenishment of pure water into the pure water storage tank 16 is stopped. Thus, the water level in the pure water storage tank 16 is always maintained between the tip of the liquid level sensor 42 and the tip of the liquid level sensor 43, but only one liquid level sensor is provided. Of course, pure water may be replenished to the pure water storage tank 16 periodically or optionally without the liquid level sensor.

  As the liquid level sensor 20 provided in the sealed container 2, for example, a liquid level sensor using a laser (for example, a liquid level controller manufactured by Asahi Seisakusho Co., Ltd.) or the like can be used. In this liquid level sensor, when the tip is exposed to air, the difference in refractive index between the material of the tip and air is large, so that the light from the light source is totally reflected and returns to the light receiver, and the tip is When the liquid is in contact with the liquid, the difference in refractive index between the material at the tip and the liquid becomes small, and light from the light source is emitted into the liquid and does not return to the light receiving unit. That is, it is a sensor that can detect the presence or absence of liquid at the tip. When the position of the pure water level falls below a specified value and the tip of the liquid level sensor 20 does not come into contact with the pure water level, a signal is sent from the liquid level sensor 20 to the control means 18, and this signal The control means 18 that has received the operation operates the switching means 17 so that pure water is replenished from the pure water storage tank 16 into the sealed container 2 through the outside air introduction pipe 3. Then, when the position of the pure water level exceeds a specified value, the tip of the liquid level sensor 20 comes into contact with the pure water level. A signal is sent from the liquid level sensor 20 to the control means 18, and the control means 18 that has received this signal operates the switching means 17, and the pure water in the sealed container 2 is supplied to the outside air introduction pipe 3. Thereby, the liquid level of the pure water in the sealed container 2 is always controlled in the vicinity of the position of the tip of the liquid level sensor 20. In addition, when the pure water is replenished from the pure water storage tank 16, it is not necessary to stop the exhaust device 4, and the air salinity measurement can be continued. Therefore, the air salinity measurement is continuously performed for a long time. be able to. The liquid level sensor similar to the above can be used for the liquid level meter 41 provided in the abnormality detection tank 40 and the liquid level sensors 42 and 43 provided in the pure water storage tank 16.

  Here, when air salinity measurement is carried out continuously for a long period of time, solid matter adheres to the filter member 5 to partially close the eyes of the filter member 5 or solid matter accumulates on the filter member 5. The introduction of the outside air to be measured into the sealed container 2 may be hindered. Therefore, in the present invention, a system configuration for eliminating clogging and the like of the filter member 5 is provided. The operating state is shown in FIG. In the air salinity measurement system shown in FIG. 3, the exhaust device 4 is stopped, the valve 32 is closed, the liquid feed pump 8 is also stopped, the valve 33 is opened, and the compressor 14 is operated. Then, a compressed gas such as compressed air is supplied into the sealed container 2. As a result, the compressed gas flows from the outside air discharge portion 3b of the outside air introduction pipe 3 toward the outside air suction portion 3a, and at that time, the adhering matter that closes the filter member 5 and the solid matter deposited on the filter member 5 are collected. It is blown up and discharged toward the outside air suction part 3a. By performing this operation periodically or arbitrarily, the air permeability of the filter member 5 is ensured, and the air salinity measurement can be performed while stably introducing the outside air over a long period of time.

  Further, if air salinity measurement is carried out continuously for a long period of time, there may be no change in the measured value of the electrical conductivity of pure water in the sealed container 2. That is, as a result of the increase in electrical conductivity that cannot be measured by the measuring device 12 due to the high concentration of salinity, the measured value of electrical conductivity may show a constant value. In such a case, the pure water is replaced by the following procedure. As shown in FIG. 5, first, the valve 30 under the sealed container 2 is opened to drain pure water. Then, pure water is replenished from the pure water storage tank 16 into the sealed container 2. Here, the inner wall of the sealed container 2 may be contaminated with salt or fine particles contained in the air to be measured. Therefore, the compressed gas is supplied from the compressor 14 to the pure water to perform bubbling, and the inner wall of the sealed container 2 is cleaned. At that time, the exhaust valve 31 is opened and the sealed container 2 is opened in order to prevent breakage due to pressure increase in the sealed container 2. Thus, by providing the air salinity measurement system 1 with the compressor 14, not only the clogging of the filter member 5 but also the cleaning of the sealed container 2 by bubbling can be easily performed. Then, drain the water in which salt and dirt are dissolved, supply pure water again, confirm that the electrical conductivity of the pure water in the sealed container 2 is sufficiently low, and then measure the salinity in the air. Resume.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, when the inside of the sealed container 2 is exhausted by the exhaust device 4 through the abnormality detection tank 40 and the pure water in the sealed container 2 increases due to a failure of the liquid level sensor 20 or the like. The pure water is supplied to the abnormality detection tank 40 for detection. However, another liquid level sensor is provided in the sealed container 2 in addition to the liquid level sensor 20, and the position of the tip is determined. It is set higher than the liquid level sensor 20, and an alarm is issued when the pure water in the sealed container 2 increases due to a failure of the liquid level sensor 20 and the pure water contacts the tip of the liquid level sensor. May be. In this case, the abnormality detection tank 40 can be omitted, and the exhaust device 4 can exhaust the inside of the sealed container 2 directly, but an alarm can be issued when abnormal water increases in the sealed container 2.

  Examples of the present invention will be described below, but the present invention is not limited to these examples.

(Comparative example)
The salinity measurement in the atmosphere was carried out by the air salinity measurement system improved from the conventional air salinity measurement method. Specifically, when the amount of pure water 102 in the sealed container 101 falls below a specified value, the pure water 102 is replenished into the sealed container 101 via the outside air introduction pipe 103, so that dirt and salt content are reduced. The air salinity measurement system is configured to prevent clogging of the nozzle 103a due to crystals, and the mist 110 is generated from the mist blowing device 105 as in the prior art. With this system, air salinity was continuously measured for 700 hours. In the following description, this system will be referred to as an improved ejector system.

  First, we investigated the recovery efficiency of airborne salinity for the improved ejector system. Specifically, using two improved ejector systems, the first system takes in the atmosphere as the measured outside air, and the gas exhausted from the first system is taken in as the measured outside air of the second system. Connected.

Here, when the recovery rate of the air salinity by the improved ejector system is α and the air salinity is C, the salinity concentration X recovered in the first system (the salinity of pure water in which the salinity is dissolved) Is represented by the following equation.
X = C × α (1)

The salinity of the gas exhausted from the first system is C−C × α. Accordingly, the salinity concentration Y recovered in the second system is expressed by the following equation.
Y = (C−C × α) × α (2)

From the expressions (1) and (2), the following relational expression is established.
X / Y = (C × α) / {(C−C × α) × α}
That is, X / Y = 1 / (1-α) (3)

  Since the salinity concentrations X and Y are obtained by measuring the electric conductivity of pure water in each system, the recovery rate α of air salinity by the improved ejector system can be obtained by using the equation (3). it can.

The measurement results are shown in Table 1. In Table 1, the unit of numerical values other than the numerical value with% is “μg / m ³ as Cl”.

  From the results shown in Table 1, it has been clarified that the recovery rate is about 60 to 80%, and the fluctuation for each period is large, so that the measurement accuracy cannot be said to be sufficient.

  Next, with the improved ejector system, air salinity is measured continuously for 700 hours, and the measurement results are assumed to be based on the gauze method (JIS Z 2382). The results were compared with the theoretical calculation results including distance, wind speed, humidity, etc.

  The results are shown in FIG. In the case of the gauze method, the numerical value may decrease in the ejector-type improved system at a place where the numerical value is constant or increased.

  From this result, it was considered that the mist generated by the ejector method is exhausted, and the salt concentration that should be increased over time is lowered.

(Example)
The recovery rate by the air salinity measurement system of the present invention not adopting the ejector method was examined. Specifically, the recovery rate was obtained by connecting two systems as in the comparative example. Further, the experiment was performed by changing the flow rate of the liquid, the presence / absence of the contact tube 10, and the length of the outside air introduction tube 3 as parameters. However, the length from the outside air suction part 3a of the outside air introduction pipe 3 to the pure water supply position between the outside air suction part 3a and the filter member 5 was all constant.

  In this example, the air salinity measurement system shown in FIG. 1 was used. The volume of the sealed container 2 was 0.4 L. The exhaust speed by the exhaust device (suction pump) 4 was 10 L / min.

  The inside diameter of the outside air introduction tube 3 was 8 mm. A filter member 5 having an aperture of 0.8 mm was used. The contact tube has an outer diameter of 12 mm, an inner diameter of 9 mm, a length of the tube 10 b of 16 mm, an outer diameter of the tube 10 b of 1.5 mm, an inner diameter of 1.0 mm, and a number of 30 tubes. did. Further, the tubes 10f and 10g connected to the openings at both ends of the housing 10b have an outer diameter of 6 mm and an inner diameter of 4 mm. The gaps 10d and 10e between the partition plate 10c and both ends of the housing 10a were set to 0.2 mm.

  The annular member 13 was attached to the outside air introduction tube 3 so as to surround the outside air discharge part 3b with an inside diameter at the upper end of 6 mm and an inside diameter at the lower end of 25 mm. The distance from the outside air discharge part 3b to the pure water level in the sealed container 2 is about 15 mm, and the distance from the lower end of the annular member 13 to the pure water level in the sealed container 2 is about 3 mm, and the outside air discharge part It was confirmed that there was almost no scattering of pure water on the surface of pure water in the sealed container 2 due to the flow of pure water from 3b or dripping. The liquid flow rate of pure water by the liquid feed pump 8 was set to about 10 to 40 mL / min.

  The results are shown in FIG. ▲ indicates the result when the outside air introduction tube 3 is 120 cm long and there is no contact tube 10, ■ indicates the result when the outside air introduction tube 3 is 120 cm long and has the contact tube 10, and ○ indicates outside air introduction The result when the length of the tube 3 is 250 cm and there is no contact tube 10 is shown, and x shows the result when the length of the outside air introduction tube 3 is 150 cm and the contact tube 10 is present. In any case, the recovery rate (collection efficiency) exceeded 97%, and it became clear that an extremely high recovery rate could be achieved as compared with the improved ejector system used in the comparative example. It has been clarified that the recovery rate increases as the length of the outside air introduction pipe 3 is increased and the liquid feeding flow rate is increased. Moreover, it became clear by providing the contact tube 10 that even if the length of the outside air introduction tube 3 is shortened, an extremely high recovery rate (99 to 100%) can be achieved.

DESCRIPTION OF SYMBOLS 1 Air salinity measurement system 2 Sealed container 3 Outside air introduction pipe 3a Outside air suction part 3b Outside air discharge part 4 Exhaust device 5 Filter member 6 1st piping 7 2nd piping 8 Liquid feed pump 10 Contact pipe 12 Measuring device 13 Annular member 14 Compression Machine 16 Pure water storage tank 17 Switching means 18 Control means

Claims (7)

An air salinity measuring method for measuring the salinity contained in the outside air to be measured,
An outside air introduction pipe having both ends opened is inserted into a sealed container containing pure water, and the opening located outside the sealed container is used as an outside air suction part and the opening located inside the sealed container is outside air. A discharge portion, and the outside air discharge portion is disposed at a position not in contact with the pure water in the sealed container, and a filter member is provided in the outside air introduction pipe,
By supplying pure water in the sealed container to a position between the outside air suction part and the filter member in the outside air introduction pipe, and flowing the pure water toward the outside air discharge part, the inside of the sealed container While forming a pure water circulation path through which the pure water circulates in the outside air introduction pipe and returns from the outside air discharge portion to the inside of the sealed container,
By evacuating the inside of the sealed container, the measured outside air is circulated from the outside air suction portion of the outside air introduction pipe to the outside air discharge portion while removing solid matter contained in the outside air to be measured by the filter member. The salt water contained in the measured outside air in the pure water flowing through the outside air introducing pipe, the salt derived from the measured outside air attached to the filter member, and the measured outside air attached to the wall surface of the outside air introducing pipe Dissolve the salt from the origin ,
A method for measuring a salinity in air, wherein the salinity contained in the outside air to be measured is measured from a measured value of electrical conductivity of pure water in the sealed container. When the amount of pure water in the sealed container decreases, pure water is supplied into the sealed container by supplying pure water to a position between the outside air suction part and the filter member in the outside air introduction pipe. The method for measuring air salinity according to claim 1, wherein replenishment is performed. An air salinity measurement system for measuring the salinity contained in the outside air to be measured,
An airtight container containing pure water;
An opening that is open at both ends and is inserted into the sealed container and located outside the sealed container serves as an outside air suction part, and an opening located inside the sealed container serves as an outside air discharge part and The outside air discharge section is arranged at a position not contacting the pure water in the sealed container; and
An exhaust device for exhausting the inside of the sealed container;
A filter member provided in the outside air introduction pipe;
A first pipe having one end in contact with pure water in the sealed container;
A second pipe having one end connected to a position between the outside air suction part of the outside air introduction pipe and the filter member;
A liquid feed pump connecting the other end of the first pipe and the other end of the second pipe;
And at least a measuring device for measuring the electrical conductivity of pure water in the sealed container,
By operating the liquid feed pump, the pure water in the sealed container flows in the order of the first pipe, the second pipe, and the outside air introduction pipe, and returns to the sealed container from the outside air discharge unit again. While a pure water circuit is formed,
By operating the exhaust device, the measured outside air is circulated from the outside air suction portion of the outside air introduction pipe to the outside air discharge portion while removing solid matter contained in the outside air to be measured by the filter member. The salt contained in the measured outside air in the pure water flowing through the outside air introducing pipe, the salt derived from the measured outside air attached to the filter member, and the measured outside air attached to the wall surface of the outside air introducing pipe The salt content of
An air salinity measurement system for measuring the salinity of the outside air to be measured from a measured value of electric conductivity of pure water in the sealed container obtained by the measuring device. A pure water storage tank for storing pure water;
Switching means for switching the source of pure water to the outside air introduction pipe from the sealed container to the pure water storage tank;
When the amount of pure water in the sealed container falls below a specified value, the switching means is operated to switch the pure water supply source to the pure water storage tank and the amount of pure water in the sealed container is a specified value. 4. The air salinity measurement system according to claim 3, further comprising control means for operating the switching means to switch the supply source of the pure water into the sealed container. The air salinity measurement system according to claim 3, wherein a plurality of pipes having an outer diameter smaller than that of the outside air introduction pipe are provided in parallel between the filter member of the outside air introduction pipe and the outside air discharge portion. A reverse funnel-shaped annular member that gradually reduces the inner diameter from the lower end toward the upper end is provided in the outside air introduction pipe so as to surround the outside air discharge portion, or the upper end and the outside air discharge portion are connected to each other. The air salinity measurement system according to claim 3, which is provided in an outside air introduction pipe. A compressor for supplying compressed gas into the sealed container;
The exhaust device is stopped, the compressed gas is supplied from the compressor into the sealed container, and the compressed gas is circulated from the outside air discharge portion toward the outside air suction portion, thereby closing the filter member. Discharging the deposits and solid matter deposited on the filter member from the outside air suction part of the outside air introduction pipe ,
4. In the operation of exchanging pure water in the sealed container, the compressed gas is supplied from the compressor to pure water in the sealed container to perform bubbling, and the inner wall of the sealed container is cleaned. The air salinity measurement system described.