JPH08159934A - Gas analysis system - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a gas analysis system which prevents a sensor from being adversely affected by simultaneously sucking a liquid when sucking a gas from a sampling unit. A system comprising at least a hollow conduit having an opening at its tip, means for sucking gas from the tip toward the inside of the hollow conduit, and a sensor for analyzing the components of the sucked gas There is a gas analysis system with a water-repellent gas permeable membrane in the gas flow path from the tip to the sensor.

Description

Detailed Description of the Invention

[0001]

This invention relates to gas analysis systems. More specifically, the present invention relates to a gas analysis system that prevents a sensor from being adversely affected by simultaneously sucking a liquid when a gas is sucked from a sampling unit, and an example of the gas analysis system to which the present invention can be advantageously applied. In addition to a gas sampling device from the inside of the diaper, there is a gas analyzer for staying in the upper part of a plant for culturing animal and plant cells or a fermentation tank for microorganisms, and a gas analyzer for the upper part of an electrolytic cell.

[0002]

2. Description of the Related Art It is conceivable to detect gas excretion by sampling gas from the diapers of all elderly care workers, sick people and infants. Due to the progress of water-absorbing polymers, care paper diapers can be adequately cared only for urine by regular replacement about twice a day. However, since stool cannot be easily absorbed into the polymer like urine, it is desirable to replace the diaper as soon as possible after excretion. Currently, caregivers judge whether or not they have stool by opening a diaper or sniffing when patrolling.

[0003]

However, as described above, the method in which the caregiver checks the diaper when patrolling requires a lot of labor and time, and there is a problem that the caregiver cannot replace the diaper at any time. Therefore, it is an object of the present invention to solve such problems and provide a simple means for automatically detecting (monitoring) excretion of stool in a diaper. Further, broadly, it is an object of the present invention to provide a gas analysis system which prevents liquid from being sucked at the same time when gas is sucked from the sampling unit and adversely affecting the sensor.

[0004]

In order to achieve the above object, the present invention has at least a hollow conduit having an opening at its tip and a means for sucking gas from the tip toward the inside of the hollow conduit. And a sensor for analyzing a component of sucked gas, wherein a water repellent gas permeable film is provided in a gas flow path from a tip portion to the sensor.

That is, the gas analysis system of the present invention is shown in FIG.
Referring to the case of detecting stool in a diaper, a hollow conduit 1 having an opening at the tip, a means 2 for sucking gas from the tip toward the inside of the hollow conduit 1,
It is composed of a sensor 3 for analyzing the components of the sucked gas, and detects the stool excretion by analyzing the gas from the diaper (sampling part) 4 and detecting propane gas, methane gas, alcohol gas, etc. can do. However, since there is urine water in the diaper, this urine water enters the flow path from the opening to the sensor,
Since it adversely affects the sensor, it cannot be put to practical use as it is. Therefore, in the present invention, by providing the water repellent gas permeable film 5 in the gas flow path from the tip to the sensor, only gas selectively passes through the water repellent gas permeable film, and water (liquid) is blocked there. , The sensor is protected from the adverse effects of moisture. Therefore, the gas analysis system of the present invention can be put to practical use as a simple means for detecting stool in a diaper. In addition, when detecting stools in the diaper, this system can be used to exhaust excessive humidity (gas vapor) inside the diaper to the outside of the diaper, without urine leakage.
There is also an effect that it can be used as a stool detection system.

As described above, the gas analysis system of the present invention is
It is useful as a gas analysis system that prevents the sensor from being adversely affected by sucking the liquid at the same time when the gas is sucked from the sampling unit, and can be applied to many purposes such as stool detection in a diaper. For example, it is necessary to analyze the concentration of oxygen and carbon dioxide in the gas staying in the upper part of a tank for culturing animal and plant cells or a fermentation tank for microorganisms, and add oxygen and nutrients as necessary. However, if gas is introduced directly into the sensor section using a hollow tube, liquid droplets due to agitation may enter the hollow tube, or the culture solution may be sucked as it is due to rise in the liquid level. At this time, if only the sensor portion is protected by the water-repellent gas permeable membrane, the sampling hollow tube and the suction pump are contaminated even if the sensor portion is safe. In addition, if a simple gas-liquid separation trap is provided, the culture solution stored in the trap may be putrefaction or the fermentation may proceed, which may cause an error in the culture analysis in the tank. Therefore, as in the present invention, a system in which a water-repellent gas permeable membrane is arranged in the sampling pipe (hollow pipe) and somewhere in the sampling portion direction, that is, in the upstream direction from the sensor portion is effective.

When the electrolytic solution is electrolyzed in the electrolytic cell, harmful or dangerous gases such as chlorine and hydrogen are generated. By steady analysis of these gas concentrations, it is possible to know the decrease in electrolysis efficiency due to the deterioration of the diaphragm. At this time, gas may be generated by electrolysis, bubbles may be formed, and electrolytic solution may be spattered by breaking bubbles, or mist with strong alkali or strong acid may be generated.Therefore, an opening was simply provided in the upper part of the electrolytic cell. This will cause corrosion not only on the sensor but also on the piping and suction pump. Therefore, the system of the present invention in which a water-repellent gas-permeable membrane having excellent chemical resistance is arranged upstream of the sensor is suitable. Furthermore, by connecting the suction pump exhaust port to an appropriate gas treatment device, it is possible to integrally configure the exhaust-analysis-exhaust gas treatment system of harmful or dangerous gas from the electrolytic cell.

The water-repellent gas-permeable membrane used in the present invention is not particularly limited as long as it is a membrane that does not pass water (liquid) but only gas, but is a porous organic polymer having water repellency. Membrane, especially stretched porous polytetrafluoroethylene (PTFE) membrane, or porous film such as polypropylene or polyethylene, continuous porous membrane in which the skeleton of a porous polymeric substrate such as a hollow system is coated with a water-repellent organic polymer Etc. can be used. Considering high water pressure resistance and application to a sick person with a pressure sore, an expanded porous PTFE membrane capable of high-pressure steam sterilization is preferable.

As a base polymer for a continuous porous membrane in which the skeleton of a porous polymer base material is coated with a water-repellent organic polymer,
Polyolefin resin such as polyethylene and polypropylene, polycarbonate, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyester and other resins, or polytetrafluoroethylene, tetrafluoroethylene / hexafluoropropylene copolymer, polyvinyl fluoride, polyvinylidene fluoride, etc. Fluororesin, etc. can be used. Among them, the stretched porous polytetrafluoroethylene is excellent in water repellency, heat resistance, chemical resistance and the like.

The water-repellent organic polymer of the continuous porous film in which the skeleton of the porous polymer substrate is coated with the water-repellent organic polymer is not particularly limited as long as it is a water-repellent organic polymer, but fluorinated organic side chains Polymers having as a pendant group repeatedly appearing are preferred. Since the pendant group of the polymer chain of this organic polymer is highly fluorinated, it has the function of increasing the water repellency and oil repellency of the porous polymer material that is the base material. Specific examples of this organic polymer include PCT / US93 / 08884 (WO94 / 22)
928), but one example is

[0011]

Embedded image

(Wherein n is an integer of ₃ to 13 and R is H or CH ₃ ), fluoroalkyl acrylate and fluoroalkyl methacrylate. Also,
"AF polymer" (trade name of DuPont), "CYTOP" (trade name of Asahi Glass), etc. can also be used. Further, copolymers of these organic polymers can also be used.

It is possible to coat the skeleton of a porous polymer substrate with such an organic polymer having water repellency to impart water repellency (and oil repellency) to the substrate while maintaining the continuous pores of the substrate. Needed, but this is for example "Florinert"
It is possible to dissolve these polymers in an inert solvent such as (3M company trade name), impregnate the porous polymer substrate, and then evaporate and remove the solvent.

The organic polymer has an average particle size of 0.01 to
By using fine particles of about 0.5 μm, it is possible to penetrate well into the fine structure of the porous substrate and form a coating with a uniform thickness on the skeletal structure thereof. Aqueous latices containing such fine polymer particles are made possible by the careful selection of microemulsions of monomers (WO94 / 22928). An organic polymer, a fluorosurfactant, and optionally a co-solvent or an inorganic salt are mixed to prepare a monomer microemulsion, and a polymerization initiator is introduced to carry out polymerization. The monomer microemulsion is 1 to 40% by weight of monomer, preferably 5 to
15% by weight, surfactant 1-40% by weight, preferably 2
-25% by weight, balance water.

The aqueous latex of the polymer thus produced can be applied to the substrate. It is also possible to apply the monomer microemulsion to the substrate and then polymerize it to coat the substrate with the polymer. After applying the polymer to the substrate, the remaining water, surfactants, polymerization initiators, etc. are appropriately removed. Then, or by the same treatment as the removal operation, the polymer remaining in the pores of the substrate can be melted to coat the skeleton of the porous substrate with the polymer and maintain the continuous pores.

The preferred physical properties of the water-repellent air-permeable membrane of the present invention are a pore size of 10 μm or less, more preferably 3 μm or less, and a porosity of 30% or more, more preferably 50% or more. For example, in the case of expanded porous PTFE, the pore size is 10μ
When it exceeds m, the water pressure resistance becomes small, and the liquid invades with the suction means having a large degree of pressure reduction. Also, if the porosity is small, the pressure loss in the water-repellent gas permeable membrane becomes large, which is not preferable. The film thickness is not particularly limited, but can be increased from the viewpoint of durability (strength) if it can be obtained without impairing the pore diameter and porosity. Further, from the viewpoint of strength, it may be laminated with a non-woven fabric or the like, if necessary.

A method of attaching the water repellent gas permeable membrane will be described later. The hollow conduit of the present invention is not particularly limited. For diapers, those having little kink and crushing and being flexible are preferable, and polyvinyl chloride and other resin conduits are suitable, but for electrolytic cells and the like, metal ones are also used. Further, the inner surface may be lined with a fluororesin or the like to improve the corrosion resistance.

The suction means of the present invention may be any of various suction means such as a suction pump and an aspirator. The gas sensor of the present invention may be any of various analysis means used depending on the analysis purpose of the system. Propane gas, methane gas, alcohol, etc. are simple and small size sensors suitable for diaper stool detection. However, a sensor for oxygen, hydrogen, etc. may be used depending on the purpose, and a large-scale analysis means such as an infrared analysis device may be used.

Next, the attachment of the water repellent gas permeable membrane will be described with reference to the drawings. FIG. 2A shows an example in which the water repellent gas permeable membrane 12 is bonded to the end surface of the hollow tube 11. In FIG. 2, the end surface of the hollow tube 11 is cut obliquely in order to increase the area of the water-repellent gas permeable membrane 12 and ensure the amount of ventilation, but it may be cut vertically. In FIG. 2B, a water repellent gas permeable membrane 12 is attached in the middle of the hollow tube 11. However, in this embodiment, the hollow tube 11 may be an ordinary hollow tube, but the hollow tube 11
When water penetrates into the tip of the water, the gas stops flowing and analysis cannot be performed until the water is completely evaporated. Therefore, the hollow tube 11 on the tip side of the water-repellent gas permeable membrane 12 is provided with a plurality of openings 13.

In FIG. 2C, a tubular water-repellent gas permeable membrane 12 '(preferably expanded porous polytetrafluoroethylene tube) is attached to the tip of the hollow tube 11. In FIGS. 2 (A) and 2 (B), if the water droplets are attached to the film portion, the ventilation function deteriorates, so that the film surface is not covered with the water droplets at one time. The tip of the tubular water-repellent air-permeable membrane 12 'is sealed. In this mode, the air permeability is secured unless the entire tubular water-repellent gas permeable membrane 12 'is submerged in water. However, since the flow path of the water-repellent gas-permeable membrane tube 12 'may be obstructed by crushing, kinking, etc., the water-repellent gas-permeable membrane is provided inside the hollow tube 14 having a plurality of openings as shown in FIG. 2D. The tube 12 'can be a double tube in which it is arranged.

The tubular water-repellent gas permeable membrane 12 '
Can be preferably obtained by making the extruded PTFE tube into a stretched porous structure, but the uniaxially stretched tube product may have a slightly lower water pressure resistance. As a countermeasure, surface treatment of coating with the water-repellent / oil-repellent organic polymer described above,
A method of covering the outer periphery of the uniaxially stretched tube with a uniaxially stretched or biaxially stretched porous PTFE film having a water pressure resistance of 76 cmHg or more can be adopted. The situation is shown in FIG. As shown in FIG. 3A, the outer periphery of the uniaxially expanded porous PTFE tube 16 is spirally wound with a film 17, or
Wrap in parallel as shown in (a). The film 17 may be partially adhered as a stretched porous PTFE film, but as a simple and reliable method, it is coated with an unsintered uniaxially stretched or biaxially stretched porous PTFE film and then heated and sintered to be integrated. The way to do is good. In addition, the tubular water-repellent air-permeable membrane 12 'is formed by stretching unbaked film-shaped expanded porous PTFE around a core material such as stainless steel or copper in a spiral or parallel shape, firing the core material, and then removing the core material to form a tubular expanded porous film. Quality PTFE can also be obtained.

FIG. 4A shows a mode in which a bag-shaped water-repellent gas permeable membrane 12 ″ is attached to the tip of the hollow tube 11. This mode is also effective for increasing the area of the water-repellent air-permeable film and ensuring a steady air permeability. However, in order to prevent the bag from being completely crushed by suction, it is necessary to dispose the spacer 18 inside the bag. As the spacer 18, in addition to a net having a coarse mesh or a non-woven fabric, a comb-shaped spacer 18 'as shown in FIG.

FIG. 5 illustrates the production of a modification of the bag-shaped water-repellent air-permeable membrane 12 ''. In (a), a water-repellent gas permeable membrane 22 is integrated on both surfaces of a plate-like material 21 such as a thermoplastic nonwoven fabric or foam having open cells (polypropylene, polyethylene, polyurethane, acrylic, etc.) while maintaining air permeability. The method of integration may be partial adhesion, compression between hot rolls and lamination. In (a), a notch 23 is inserted into one end of the plate-like material 21, and a thermoplastic resin hollow tube 24 is inserted ((c)). Next, a metal rod 25 is inserted so that the hollow tube 24 is not blocked, and then the outer peripheral portion of the plate-like material 21 and the insertion portion of the hollow tube 24 are fused. The fusion-bonding portion 26 is a sealing portion that does not let air pass through, let alone water. This seal is
For example, it can be carried out by heating and pressing the outer peripheral portion and the insertion portion of the hollow tube with a mold (e is a half mold) shown in (e). After this fusion, 25 is removed.

Further, such a bag-shaped water-repellent air-permeable membrane 1
For example, when used in a diaper, 2 '' has a fold or a comb-shaped projection 28 on the surface to prevent the film surface from directly touching the skin and sticking to it or being contaminated with body fat. Can be attached ((A) of FIG. 6 is a perspective view, (A) is a sectional view). Further, the treatment with the water-repellent / oil-repellent organic polymer described above is also effective for improving the oil stain resistance.

In FIG. 7, a thermoplastic resin housing 29, a non-woven fabric or foam 21, and a water-repellent air-permeable membrane 22 are combined and the outer peripheral portion 30 is fused. Housing 2
Reference numeral 9 denotes, for example, a cylindrical shape with a bottom, and a nonwoven fabric or foam 21 and a water-repellent gas permeable membrane 22 are arranged on the open top portion, and the portion where the nonwoven fabric or foam 21 (and the water-repellent gas permeable membrane 22) contacts the housing 29 is fused. It was done. The inside of the cylindrical housing 29 is communicated with the intake hollow tube by a hollow tube 29a. Further, a spacer may be further arranged in the space inside 29.

8 and 9 show examples in which the outer circumference of a porous sintered body of metal or plastic is covered with a tube or film of a water repellent gas permeable film. For example, by inserting a stretched porous PTFE tube (one having a surface treatment or a composite with a biaxially stretched film) 32 having one end sealed into the porous sintered body 31 (FIG. 8), a porous having one end sealed Stretched porous P on sintered body 33
Wrap the TFE film 34 (FIG. 9). 35 is a hollow conduit. These parts may be covered with a net or a cylinder having many openings for protection (not shown).

The water repellent gas permeable membrane mounting portion as described above may be directly provided in the hollow conduit communicating with the suction means, but only the water repellent gas permeable membrane mounting portion may be replaceable. For example, in the example of FIG. 8, the porous sintered body 3
Since the member 37 supporting 1 is formed so as to be inserted into the hollow conduit 35, only this portion can be replaced. According to the gas analysis system of the present invention, since the sensor unit is installed at a place apart from the sampling unit by the hollow conduit, it is possible to protect the sensor unit and the electric circuit unit from a polluting or corrosive atmosphere around the sampling, for example. it can. Further, by preparing a plurality of hollow conduits and using a switching valve together, it is possible to analyze the gas of a large number of sampling parts with one sensor.

[0028]

【Example】

(Example 1) A mounting portion for a water-repellent air-permeable membrane as shown in FIG. 7 was prepared. That is, a bottomed cylindrical member (housing) 29 having an outer diameter of 10 mm, an inner diameter of 4 mm, a height of 2 mm, and a hole depth of 1.65 mm was made of ABS resin. A hole having an outer diameter of 1.3 mm is provided on the side surface of the bottomed cylindrical member 29. A stainless pipe 29a having an outer diameter of 1.27 mm and an inner diameter of 0.8 mm was inserted into this hole and bonded with an epoxy adhesive.

As the water-repellent air-permeable membrane, polypropylene nonwoven fabric 21 (thickness 0.1 mm) 21 and expanded porous PTFE film (thickness 40 μm, nominal pore diameter 0.2 μm, porosity 78)
%, Water pressure resistance 3.4 kg / cm ² ) 22 integrated with a hot roll was used. This water-repellent air-permeable film was fused and integrated at the end of the open hole of the bottomed cylindrical member 29 by using a heat mold.

The stainless pipe 29a was inserted into a FEP hollow conduit having an outer diameter of 1.8 mm and an inner diameter of 1 mm. The air flow rate sampled by the suction pump through this hollow conduit and the degree of pressure reduction at that time were as follows. Flow rate (l / min) Decompression degree (cmHg) 1.5 -2 1.0 -1.5 0.5 -1 In addition, while sampling gas at a flow rate of 0.5 liter / min, the tip (water repellent aeration membrane) When the part was immersed in water, no infiltration of water through the water-repellent aeration film was observed. Also, when the tip was pulled up from the water, the air flow immediately recovered.

(Embodiment 2) Referring to FIG. 10, (a)
A stretched porous PTFE tube 42 was inserted into a polyvinyl chloride connector 41, and potted with a two-liquid mixed type epoxy resin 43 to be fixed. The expanded porous PTFE tube 42 is a uniaxially extruded PTFE tube and a biaxially expanded PTFE tube.
Composite tube wrapped with E film (outer diameter 1.9m
m, inner diameter 1.0 mm, length 10 cm). During the potting, a stainless steel pipe having an outer diameter of 1 mm was previously inserted into the tube so that the potting solution would not enter the tube, and the epoxy resin was removed after curing.

Then, a polyvinyl chloride tube 44 (inner diameter: 3 m) having a large number of holes with a diameter of 2 mm and one end sealed
m), the above-mentioned PTFE composite tube 42 is inserted so as to come into contact with the sealed end portion of the polyvinyl chloride tube 44, and the polyvinyl chloride connector 41 and the polyvinyl chloride tube 44 are connected to the polyvinyl chloride system. Bonded with an adhesive. Further, the polyvinyl chloride tube 44 is held so that the sealing end faces downward, and the two-component mixed epoxy resin 45 is injected from one of the openings to seal the end of the PTFE composite tube 42. I did it.

The end of the connector 41 was inserted into a hollow conduit (not shown) made of a polyvinyl chloride tube (inner diameter: 3 mm), and the PTFE composite tube 42 was connected to the intake pump via the hollow conduit. The air flow rate sampled through this hollow conduit and the degree of pressure reduction at that time were as follows.

Flow rate (l / min) Decompression degree (cmHg) 1.5 <1 1.0 <1 0.5 <1 Further, while sampling gas at a flow rate of 1.0 liter / min, the tip (water repellent gas permeable membrane) ) Part was immersed in water, no infiltration of water through the water-repellent air-permeable membrane was observed. Also, when the tip was pulled up from the water, the air flow immediately recovered.

Example 3 Fluoroacrylate was added to a 100 ml glass reactor.

[0036]

Embedded image

(Du Pont product name Zonyl TA-N) 10 g,
Add 15 g of ammonium perfluorooctaate (fluorinated surfactant) and 70 g of distilled water, and stir to 7
Heated to 0 ° C. A pale green clear microemulsion was formed. 0.1 g of potassium persulfate dissolved in 5 g of distilled water was placed in the reactor to start the reaction. The reaction was carried out at 70 ° C for about 1 hour. Then the reaction mixture was cooled to room temperature. A clear latex was obtained and was stable at room temperature for at least 24 hours. The average particle size of the latex was about 0.03 μm as determined by the pseudoelastic light scattering method. When the weight average molecular weight of the obtained polymer was measured, it was about 1,000,000 or more by the classical light scattering method.

An expanded porous PTFE membrane (thickness 40 μm, nominal pore diameter 0.2 μm, porosity 75%) was dipped in a product obtained by diluting this aqueous latex three times with distilled water to remove excess liquid, Place in a 225 ° oven for 3 minutes. By this treatment, water and the fluorinated surfactant were removed, and the fluorinated polymer was melted and fluidized. The Gurley number of the obtained film was 11 seconds, and it was confirmed that continuous pores were maintained. The water pressure resistance of this membrane was 5.1 kg / cm ² .

Referring to FIG. 5, a basis weight of 300 g / m ²
The above-prepared film 22 was integrated on both surfaces of the polypropylene nonwoven fabric 21 by using a hot roll. The thickness after integration was 1.2 mm. At one end of the integrated three-layer structure, a cut was made in the layer of polypropylene nonwoven fabric, and a polyvinyl chloride hollow tube (inner diameter 0.8 mm, outer diameter 2 mm) 24 was inserted. Brass wire (outer diameter 0.9m) inside the hollow tube 24
m) 25 was inserted, and the peripheral portion and the hollow tube were heat-sealed to form a watertight and airtight integrated product, and then the brass wire 25 was removed. The effective ventilation area that was not crushed by this heat fusion was 2 cm ² in total for the front and back surfaces.

The air flow rate sampled by the suction pump through the hollow conduit and the degree of pressure reduction at that time were as follows. Flow rate (l / min) Decompression degree (cmHg) 1.5 <1 1.0 <1 0.5 <1 In addition, while sampling gas at a flow rate of 1.0 liter / min, remove the tip (water repellent gas permeable membrane) part. When immersed in water, no infiltration of water through the water-repellent air-permeable membrane was observed. Also, when the tip was pulled up from the water, the air flow immediately recovered.

As a control, expanded porous PTF not coated with the above water-repellent and oil-repellent organic polymer.
E membrane (thickness 40 μm, nominal pore diameter 0.2 μm, porosity 75
%) To prepare a water-repellent gas-permeable membrane component (embodiment of FIG. 5) having the same structure. Then, regarding the water-repellent air-permeable membrane component of the example 3 and the contrast, the thread cutting oil for waterworks conduit "Miyagawa 50
W "(REX INDUSTRIES CO.LT
D. ) Was diluted to a concentration of 0.1% by volume, and the suction pump was actuated in the same manner as in the above-mentioned example to bring it into a reduced pressure state. as a result,
When the tip of the control part was immersed in water mixed with the above oil at a reduced pressure of 0.1 kg / cm ² , a water leak was observed 64 minutes later, but the part of Example 3 still observed water intrusion. Was not done.

[0042]

According to the present invention, there is provided a gas analysis system capable of simultaneously sucking a liquid when the gas is sucked from the sampling portion and preventing the possibility of adversely affecting the sensor. This gas analysis system,
It is extremely useful in providing a simple automatic detection system for stools in diapers such as sick people and infants. In addition, it is also useful for gas analysis in the upper part of the culture tank, the fermentation tank, and the upper part of the electrolysis tank. In addition, there is also the effect of forced ventilation that selectively discharges only gas without discharging water from the system,
Furthermore, since a water-repellent gas permeable membrane with a sufficiently small pore size is used, there is no release of pollutant particles (including microorganisms) from the inside of the system to the outside of the system, and even if the suction pump stops It also has the effect of preventing contaminant particles from entering the inside.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a gas analysis system of the present invention.

FIG. 2 is an explanatory diagram of a water repellent gas permeable membrane portion of the gas analysis system of the present invention.

FIG. 3 is a diagram illustrating the production of a water-repellent air-permeable membrane composite tube.

FIG. 4 is an explanatory diagram of a water repellent gas permeable membrane portion of the gas analysis system of the present invention.

FIG. 5 is an explanatory diagram of a water repellent gas permeable membrane portion of the gas analysis system of the present invention.

FIG. 6 is an explanatory view of a water repellent gas permeable membrane portion of the gas analysis system of the present invention.

FIG. 7 is an explanatory view of a water repellent gas permeable membrane portion of the gas analysis system of the present invention.

FIG. 8 is an explanatory view of a water repellent gas permeable membrane portion of the gas analysis system of the present invention.

FIG. 9 is an explanatory diagram of a water repellent gas permeable membrane portion of the gas analysis system of the present invention.

FIG. 10 is an explanatory diagram of a gas analysis system of an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hollow conduit 2 ... Suction pump 3 ... Sensor 4 ... Sampling part 5 ... Water-repellent gas-permeable membrane 11 ... Hollow conduit 12, 12 ', 12' '... Water-repellent gas-permeable membrane 13 ... Opening 14 ... External tube 18 ... Spacer 21 ... nonwoven fabric or foam 22 ... water repellent gas permeable membrane 24 ... hollow tube 25 ... metal rod 26 ... peripheral part sealing portion 29 ... housing 29a ... hollow tube 31 ... porous sintered body 41 ... connector 42 ... water repellent gas permeable membrane 43 ... Adhesive 44 ... External tube

Claims (4)

[Claims] 1. At least a hollow conduit having an opening at the tip, means for sucking gas from the tip toward the inside of the hollow conduit, and a sensor for analyzing the components of the sucked gas. A gas analysis system, characterized in that a water-repellent gas permeable membrane is provided in a gas flow path from the tip to the sensor. 2. The gas analysis system according to claim 1, wherein the water-repellent gas permeable membrane is porous polytetrafluoroethylene having continuous pores. 3. The gas according to claim 1, wherein the water-repellent air-permeable membrane is a membrane in which a skeleton of a porous polymer substrate having continuous pores is covered with a water-repellent and oil-repellent organic polymer and the continuous pores are maintained. Analytical sensor. 4. The gas analysis system according to claim 1, wherein the opening and the water repellent gas permeable film are detachably provided.