JP2000350924A - Filter tool, filter using the tool and concentration measuring system formed of combination of filter with portable concentration meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily filter for separating a transparent liquid to be measured by setting an MF hollow fiber membrane filter on the tip of an injecting and pouring instrument of the injector shape, sucking and picking the liquid to be measured and then removing the filter and feeding a filtered transparent liquid to be measured from the injecting and pouring instrument into a portable concentration meter. SOLUTION: When the concentration of a processing liquid, a cleaning liquid, or the like, is measured, the tip of a transparent guide tube 13 of a filter is immersed in a liquid to be measured and a piston 32 of an injecting and pouring instrument 3 is drawn out of a cylinder 31, the pressure in the interior space of the cylinder 31 is reduced, and a liquid to be measured is absorbed and introduced through filter meshes of an MF hollow fiber membrane 11, and the transparent liquid to be measured which is filled by an MF hollow fiber membrane 11 is stored in an interior space of the cylinder 31. Then, a filter tool 1 is removed from the injecting and pouring instrument 3, and the piston 32 is operated to drop one drip of the filtered liquid to be measured stored in the interior space of the cylinder 31 from the tip of the cylinder 31 onto an adhesive face of the liquid to be measured of a portable concentration meter. Then the measurement of concentration is carried out by observing from an eyepiece section of the portable concentration meter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for filtering a liquid to be measured used for concentration measurement using a portable densitometer using a measuring method based on visual observation of transmitted light of the liquid to be measured, and using the same. The present invention relates to a filter and a concentration measuring system combining the filter and a portable densitometer.

[0002]

2. Description of the Related Art Processing fluids and cleaning fluids are used for processing such as cutting, polishing and cutting, and cleaning of manufactured parts. When maintaining and processing the quality of these machining fluids and cleaning fluids, these fluids are used. It is necessary to measure the concentration of the liquid. In this case, a stationary type concentration measuring device may be used, but as a simple method, a portable refractometer or the like which can be used at the site where the liquid to be measured is collected is often used. Also, in the measurement of the sugar content and the like of fruits, as a simple measuring method, a portable refractometer or the like which can be used at a fruit sampling site is used. The measurement by these portable refractometers and portable refractometers (hereinafter collectively referred to as portable densitometers) uses a measurement method by visual observation of the transmitted light of the liquid to be measured in the portable densitometers. It is. In the measurement, a drop of the liquid to be measured is placed on the surface of the portable densitometer to which the liquid to be measured is attached. This is performed by visually reading the scale indicated by the position.

[0003]

However, liquids to be measured, such as working fluids and cleaning liquids, contain oils and fats in the form of emulsion and other fine dirt components. The observation surface was not obtained, and it was difficult to measure the concentration accurately. Also, in the measurement of sugar content of fruit juice and the like, these liquids to be measured contain a large number of components other than the components to be measured, and the liquid to be measured is not transparent due to these components. Accurate measurement with a refractometer was difficult. Therefore, when a portable densitometer is used, it is necessary to remove fats and oils and dirt contained in the liquid to be measured, or components unnecessary for the concentration measurement before the concentration measurement. However, if the apparatus for performing this filtration is large-scale, the portable convenience of the portable densitometer cannot be utilized, so that a filter that is convenient to carry and that can easily filter the liquid to be measured has been demanded. . Accordingly, the present invention has been made to solve this problem, and a filtration for obtaining a transparent liquid to be measured, which is necessary for measurement with a portable densitometer, can be easily performed, and furthermore, a filtration which is convenient and portable. Another object of the present invention is to provide a filter and a filter using the same and a simple concentration measuring system combining the filter and a portable densitometer.

[0004]

Means for Solving the Problems In order to solve such problems, the present inventors have made intensive studies and as a result have obtained the following idea. That is, in order to obtain a transparent liquid to be measured, which is necessary for measurement by a portable densitometer, a filter of an MF hollow fiber membrane for filtering components unnecessary for measurement is attached to the tip of a syringe-like injection / injector. The liquid to be measured is suctioned and collected, and then the filter is removed and the filtered and transparent liquid to be measured is supplied to the portable densitometer from the pouring and injecting device (first method), or a syringe-like injection method is used. Aspirate and collect the liquid to be measured with the accessor,
Thereafter, a filter of an MF hollow fiber membrane is attached to the tip of the pouring / injecting device, and a transparent liquid to be measured filtered from the tip of the filter is supplied to a portable densitometer (second method).
It is.

More specifically, a first filter for obtaining a transparent liquid to be measured filtered by the first method comprises a pouring / injecting device having a piston and a cylinder, and a filter.
The first filter tool, which is the filter tool, has a closed end at the distal end, forms an outer surface as a suction surface for the liquid to be measured, and opens the target device through an opening provided at the base end through a hollow internal space. An MF hollow fiber membrane for discharging a liquid out of the membrane, connecting means for detachably connecting the base end opening of the MF hollow fiber membrane and a distal end of the pouring / injecting device, and the MF hollow fiber membrane from the connecting means. A guide means extending toward the tip of the MF hollow fiber membrane so as to surround the MF hollow fiber membrane, the tip end opening thereof being positioned near the closed end of the MF hollow fiber membrane, and the opening serving as an inlet for the liquid to be measured. It consists of. At this time, the MF hollow fiber membrane is configured so that the distal end is located deeper than the distal end opening surface of the guide means.

[0006] The MF used in the first filter tool
The hollow fiber membrane is a microfilter hollow fiber membrane, and is a pipe-shaped filter having a fine mesh.
The front end of the MF hollow fiber membrane is closed so that the liquid to be measured does not directly enter from the front end.

[0007] In the first filter having the above-mentioned structure, the first filter and the spout are connected by connecting the tip of the cylinder of the spout to the connecting means of the first filter. ing. In this first filter, the internal space of the cylinder of the pouring and injecting device, the internal space of the connecting means, and the hollow internal space of the MF hollow fiber membrane communicate with each other to form one confidential space. This secret space is called a connection space. The introduction space formed by the outer surface of the MF hollow fiber membrane and the inner peripheral surface of the guide means is a space having an opening as an opening, and is adjacent to the above coupling space via the MF hollow fiber membrane. I have. These spaces serve as passages for the liquid to be measured.

When the introduction port, which is the tip of the first filter, is immersed in the liquid to be measured, the opening of the introduction space is closed by the liquid to be measured, so that the introduction space is kept confidential. Next, when the piston of the injector is drawn out of the cylinder, the internal space of the cylinder is depressurized, the coupling space is depressurized, and the introduction space is also depressurized through the mesh of the MF hollow fiber membrane. Then, the liquid to be measured is sucked / introduced into the introduction space by the reduced pressure, and is sucked / introduced into the coupling space through the mesh of the MF hollow fiber membrane. As a result, the liquid to be measured, which is filtered by the MF hollow fiber membrane, is contained in the cylinder internal space.

Next, the first filter is removed from the injector of the first filter, and the piston of the injector is operated to operate the filtered liquid to be measured contained in the internal space of the cylinder. Is dropped onto the surface of the portable densitometer to which the liquid to be measured adheres by dropping one drop from the tip of the cylinder of the injection / injector. The density is measured as described above by observing through the eyepiece of the portable densitometer. In the above method,
Since the liquid to be measured is filtered by the MF hollow fiber membrane to be a transparent liquid, a transparent observation surface can be obtained with a portable densitometer, and the concentration can be accurately measured.

[0010] Since the above-mentioned first filter and the injector are very small, the use of the first filter and the injector makes it possible to carry the first filter for concentration measurement conveniently and easily. And a first filter can be realized. In addition, the filtration for obtaining a transparent liquid to be measured can be easily performed by a simple operation of dipping the tip of the first filter into the liquid to be measured and pulling out the piston of the pouring and injecting device from the cylinder. By using the first filter together with a small portable densitometer, a first concentration measurement system that is convenient and simple to carry can be realized.

In the above-mentioned first filter, the first filter used in the filter is configured so that the tip of the MF hollow fiber membrane is located deeper than the inlet. You may comprise so that it may be located at this side. But in this case,
Since the tip of the MF hollow fiber membrane protrudes from the inlet, it is easily contaminated, and when the liquid to be measured is placed in a shallow petri dish or the like, it is not easy to immerse the inlet in the liquid to be measured. Therefore, by configuring the tip of the MF hollow fiber membrane to be located deeper than the inlet, it is possible to provide a first filtering tool in which the MF hollow fiber membrane is less likely to be soiled and the operation for collecting the liquid to be measured is easy.

The MF hollow fiber membrane used for the first filter needs to be closed at the tip so that the liquid to be measured does not directly enter the tip of the MF hollow fiber membrane. A method of closing the tip with an adhesive is required. However, there is also a method in which the closing is performed by bending the MF hollow fiber membrane. This method does not require separate materials such as adhesives and is easy to work.
It is possible to provide a low cost first filtering device.

Next, a description will be given of a second filter for obtaining a transparent liquid to be measured filtered by the second method. A second filter, an injector having a piston and a cylinder,
A second filter tool, which is a filter tool,
A closed end is provided on the side close to the pouring / injecting device, the outer surface is a suction surface for the liquid to be measured, and the measured object is passed through an opening provided on the far side from the closed end through a hollow internal space. An MF hollow fiber membrane that discharges the liquid outside the membrane, and a pipe end surrounding the MF hollow fiber membrane on the inner peripheral surface and having the opening of the MF hollow fiber membrane, and connecting the pipe end to the outer peripheral surface. A sealing opening formed between the outer surface of the MF hollow fiber membrane and a connection opening for supporting the end of the injecting and ejecting device at the other end in a sealed state with the space therebetween being provided at the other end; Through
It comprises a tubular guide means for guiding the liquid to be measured poured out from the pouring / introducing device to the outer surface of the MF hollow fiber membrane. The closed end of the MF hollow fiber membrane can be formed in the same manner as in the first filter.

[0014] In the second filter having the above-mentioned structure, the second filter and the spout are connected to the connecting opening provided in the guide means of the second filter with the tip of the cylinder of the spout. Inserted and joined. The inner space of the cylinder of the injector and the closed space of the guide means are connected to each other to form one secret space, and this secret space is formed by the MF hollow fiber membrane through the MF hollow fiber membrane. Adjacent to the hollow internal space, these spaces become passages for the liquid to be measured.

[0015] As a filtration method using the second filter, first, a pouring / injecting device is used alone. That is, the tip of the pouring / injecting device is immersed in the liquid to be measured, and the liquid to be measured is suctioned and collected into the cylinder of the pouring / injecting device. Next, the tip of the injector is inserted into the connection opening of the second filter to form a second filter, and the piston is operated to measure the liquid to be measured contained in the internal space of the cylinder. Is sent to the closed space of the guide means of the second filter and is extracted into the internal space of the MF hollow fiber membrane through the outer surface of the MF hollow fiber membrane, thereby filtering the liquid to be measured. Then, one drop of the filtered transparent liquid to be measured is dropped from the opening of the MF hollow fiber membrane onto the surface of the portable densitometer to which the liquid to be measured is attached, and adhered thereto in the same manner as described in the first filter. Concentration is measured by measuring the concentration of the liquid to be measured because the liquid to be measured is transparent.

With the above second filter, a second filter and a second filter for concentration measurement which can be easily filtered to obtain a transparent liquid to be measured and which are convenient to carry can be realized. . In addition, by using this second filter together with a small portable densitometer, a second concentration measuring system that is convenient and simple to carry can be realized.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. The present invention relates to a filter and a filter for obtaining a transparent liquid to be measured required for measurement by a portable densitometer, and relates to a first filter and a first filter used in the first method described above. A first embodiment relating to a filter and a second embodiment relating to a second filter and a second filter used in the above-described second method will be described.

First, the first embodiment will be described. FIG.
FIG. 2 is a front view of a first filter of the first embodiment, and FIG. 2 is a longitudinal sectional view of a first filter used therein. First, the configuration of the first filter 1 will be described. The first filtration device 1 uses an MF hollow fiber membrane 11 as a filtration member. As described above, the MF hollow fiber membrane is a microfilter hollow fiber membrane, and is a pipe-shaped filter having a fine filter. The size of the mesh of the MF hollow fiber membrane 11 changes according to the cleanliness of the liquid to be measured.

The MF hollow fiber membrane 11 needs to be closed at its tip to form a closed end so that the liquid to be measured does not directly enter from its tip. This tip is referred to as the MF hollow fiber membrane closed end 15. As a method of forming the closed end, welding, adhesion, or the like can be adopted, but welding is superior in that no impurities are mixed. As shown in FIG. 6, there is also a method of binding the tip of the MF hollow fiber membrane 11 with a thread 51 or the like. A more preferable method for forming the closed end is to bend the MF hollow fiber membrane as shown in FIG. This method does not require equipment such as a welding device or a separate material such as an adhesive, and is easy to operate. Therefore, a low-cost filter can be provided.

On the other hand, the other end of the MF hollow fiber membrane 11 is opened to form the MF hollow fiber membrane base opening 16. By suctioning the liquid to be measured from the outer surface of the pipe-shaped filter, the liquid to be measured is filtered, and the filtered liquid is passed through the MF hollow fiber membrane inner space 17 which is the hollow of the pipe-shaped filter. MF hollow fiber membrane base opening 16
To the outside. The MF hollow fiber membrane 11 in FIGS. 1 and 2 is exaggerated as a whole, including the MF hollow fiber membrane closed end 15 which is the tip.

As shown in FIG. 2, the MF hollow fiber membrane 11 has a diameter larger than that of the MF hollow fiber membrane 11 and is attached to an open end of a connecting pipe 12 having both ends opened and having flexibility. I have. The other end of the connecting pipe 12 has an open shape, and the inner diameter thereof is set so that the tip of an injecting / discharging device 3 as a suction means described later can be detachably inserted. As shown in FIG. 2, the MF hollow fiber membrane 1 extends around the entire length of the MF hollow fiber membrane 11 to which the proximal end opening 16 of the MF hollow fiber membrane is fixed by the connecting pipe 12 as shown in FIG.
1 is provided with a transparent guide tube 13 surrounding one end of which is attached to the MF hollow fiber membrane base opening 16.
2 attached to one end. The other end of the guide tube 13 is open to form an inlet 18 for the liquid to be measured. The guide tube 13 is located at a position deeper than the inlet 18 of the guide tube 13.
It is arranged so that the F hollow fiber membrane closed end 15 is located.

As shown in FIG. 1, a cylinder 31 is connected to the other end of the connecting pipe 12 of the first filter 1 constructed as described above.
Tip 3 of injecting and ejecting device 3 having piston 32 and piston 32
3 to form a first filter of the first embodiment.
The pouring / injecting device 3 has a syringe shape and uses a well-known general-purpose device. In the first filter including the first filter 1 and the pouring / injecting device 3, the internal space of the cylinder 31 of the pouring / injecting device 3, the internal space 20 of the connecting pipe 12, and the internal space 17 of the MF hollow fiber membrane are different from each other. Communicate with each other to form one confidential space, and this confidential space is referred to as a joint space. Also M
The introduction space 19 formed by the outer surface of the F hollow fiber membrane 11 and the inner peripheral surface of the guide tube 13 is a space in which the introduction port 18 is opened, and the above-mentioned coupling space is formed through the MF hollow fiber membrane 11. Are adjacent. These spaces serve as passages for the liquid to be measured.

The inlet 18 which is the tip of the first filter
Is immersed in the liquid to be measured, the opening of the introduction space 19 is closed with the liquid to be measured, so that the introduction space 19 is kept confidential. Next, when the piston 32 of the pouring and injecting device 3 is pulled out from the cylinder 31, the internal space of the cylinder 31 is depressurized, the coupling space is also depressurized, and through the mesh of the MF hollow fiber membrane 11,
The pressure in the introduction space 19 is also reduced. Therefore, the liquid to be measured is sucked and introduced into the introduction space 19 by this reduced pressure, and the MF hollow fiber membrane 1 is introduced.
It is sucked and introduced into the coupling space through one filter. As a result, the MF hollow fiber membrane 11
The transparent liquid to be measured, which is filtered by the above, is stored. In the first filter, since the guide tube 13 is made of a transparent material, the state of the liquid to be measured can be easily understood when the liquid to be measured is sucked and introduced into the introduction space 19, and the liquid to be measured is collected. Can contribute to ease of operation.

Next, the first filter 1 is removed from the injecting / discharging device 3 of the first filter, and the liquid to be measured protection plate 42 of the portable densitometer 4 is placed upward as shown in FIG. After lifting,
By operating the piston 32 of the injection / injection device 3, the cylinder 31
A drop of the filtered liquid to be measured contained in the internal space of
Is dropped and adhered to the surface 41 to be measured. Then, by observing through the eyepiece section 44 of the portable densitometer 4, the density is measured as described above. In the above method, since the liquid to be measured is filtered by the MF hollow fiber membrane 11 to become a transparent liquid, a transparent observation surface is obtained in the portable densitometer 4 and the concentration can be accurately measured. . FIG. 8 shows this state, and shows that the boundary between the two-color layers, which is visible in the field of view of the eyepiece 44 of the portable densitometer 4, is clear. FIG. 9 shows a state where the concentration of the liquid to be measured is measured without being filtered.
Note that a saccharimeter is also a type of densitometer, and a saccharimeter can be measured by a similar method.

Since the first filter 1 and the spout 3 are very small, the use of the first filter 1 and the spout 3 makes it convenient to carry the concentration measurement. The first filter and the first filter can be realized. Further, the filtration for obtaining a transparent liquid to be measured can be easily performed by a simple operation of dipping the tip of the first filter into the liquid to be measured and pulling out the piston 32 of the pouring and injecting device 3 from the cylinder 31. it can. By using the first filter together with the small portable densitometer 4, a portable and simple concentration measuring system can be realized.

In the above-mentioned first filter, the first filter 1 used for the filter has the MF hollow fiber membrane closed end 15 located behind the inlet port 18 which is the open end of the guide tube 13. Although it is configured as described above, it may be configured so as to be located before the inlet 18. However, in this case, the inlet 1
8, the closed end 15 of the MF hollow fiber membrane protrudes, is easily contaminated, and when the liquid to be measured is placed in a petri dish with a shallow bottom, it is not easy to immerse the inlet 18 in the liquid to be measured. Therefore, by configuring the MF hollow fiber membrane closed end 15 so as to be located deeper than the introduction port 18, the MF hollow fiber membrane 11 is less likely to be contaminated, and the first filter 1 that facilitates the operation of collecting the liquid to be measured is used. Can be provided.

Although one MF hollow fiber membrane 11 is used for the first filter 1 used in the first filter, the present invention is not limited to this, and a plurality of MF hollow fiber membranes may be used. it can.
FIG. 3 shows an example in which two MF hollow fiber membranes are used. In this case, since the surface area of the MF hollow fiber membrane is increased as compared with the case of a single MF hollow fiber membrane, there is an advantage that a force for sucking a certain amount of the liquid to be measured can be reduced. Although the first filter 1 is formed as a separate member from the connecting tube 12 and the guide tube 13, it can be integrally formed. FIG. 4 shows this example. The MF hollow fiber membrane 11 in FIGS. 3 and 4 is exaggerated as a whole, including the MF hollow fiber membrane closed end which is the tip.

Although the first filter is constructed by combining the first filter 1 and the pouring / injecting device 3, the present invention is not limited to this. The configuration method used is also conceivable.

Next, a second embodiment will be described. The second filter of the second embodiment is also composed of a filter and a spout. FIG. 10 is a longitudinal sectional view of a second filter used in the second filter. In addition, as the spouting device used in the second filter, a known product similar to that used in the first embodiment is used.

Next, the second filter 6 will be described. In FIG. 10, the MF hollow fiber membrane 61 having the same structure as that of the first embodiment is used as the second filter 6. The MF hollow fiber membrane 61 has an MF hollow fiber membrane inner space 67, the tube end is an MF hollow fiber membrane opening 66, and the other end is an MF hollow fiber membrane closed end 65. For forming the MF hollow fiber membrane closed end 65, the same method as in the first embodiment is used. The MF hollow fiber membrane 6
1 is a flexible pipe with open ends at both ends, and the entire length of the guide tube 63 is longer than the entire length of the MF hollow fiber membrane 61.
Is arranged such that the outer peripheral surface of the MF hollow fiber membrane 61 is surrounded by the inner peripheral surface of the guide tube 63. The MF hollow fiber membrane opening 66 is open on the opening surface of the guide tube tip 68, and the outer peripheral surface of the MF hollow fiber membrane 61 and the guide tube 63.
The introduction space 69 formed by the inner peripheral surface of the
The MF hollow fiber membrane 61 and the guide tube 63 are attached to the MF hollow fiber membrane fixing portion 6
4 is tightly fixed. The other end of the guide tube 63 is a connection opening 70 having an open shape, and the inner diameter thereof is set so that the tip of the injecting and dispensing device 3 can be detachably inserted. Although one MF hollow fiber membrane 61 is used in the above description, the present invention is not limited to this, and a plurality of MF hollow fiber membranes can be used as in the first embodiment.

A second filter using the second filter 6 having the above-described structure is used.
The filter 70 has a connection opening 70 of the second filter and the cylinder tip 33 of the pouring / injecting device 3 connected to each other. Therefore,
The internal space of the cylinder 31 of the injecting / discharging device 3 and the introduction space 69 of the second filtering device 6 communicate with each other to form one confidential space, and this confidential space is formed via the MF hollow fiber membrane 61. The MF hollow fiber membrane inner space 67, and these spaces serve as passages for the liquid to be measured.

In the method of using the second filter, first, the pouring / injecting device 3 is used alone. That is, the tip of the pouring / injecting unit 3 is immersed in the liquid to be measured, and the liquid to be measured is poured into the cylinder 31
Collect by suction. Next, the cylinder tip 33 of the pouring and dispensing device 3 is inserted into the connection opening 70 of the second filter 6 to form a second filter. And the piston 3 of the pouring and injecting device 3
2, the liquid to be measured contained in the internal space of the cylinder 31 is sent out to the introduction space 69 of the second filtering device 6,
By extracting into the MF introduction space 69 through the outer surface of the MF hollow fiber membrane 61, the liquid to be measured is filtered. Then, the filtered transparent liquid to be measured is mixed with M as shown in FIG.
One drop is dropped from the F hollow fiber membrane opening 66 onto the surface 41 to be measured of the portable densitometer 4 and adhered thereto. Then, the concentration is measured in the same manner as described in the first embodiment, but
Since the liquid to be measured is transparent, the concentration can be measured accurately.

The second filter 6 and the second filter 6 for concentration measurement which can be easily filtered to obtain a transparent liquid to be measured can be easily carried out. it can. In addition, by using the second filter together with the small-sized portable densitometer 4, a second concentration measuring system that is convenient and simple to carry can be realized.

In the second filter of the second embodiment, since the introduction space 69 is pressurized by pushing the piston 32,
The second filtering tool 6 is easily detached from the pouring / injecting device 3. Therefore, the outside diameter of the cylinder tip 33 of the pouring / injecting device 3 is made slightly larger than the inside diameter of the connection opening 70 of the second filtering device 6, and the cylinder tip 33 is pressed into the connection opening 70. It is effective to use a method in which the connection between the connection opening 70 of the second filter 6 and the cylinder tip 33 of the injecting and ejecting device 3 is firmly secured while maintaining confidentiality. On the other hand, in the first filter of the first embodiment, since the connecting portion internal space 20 is depressurized by pulling the piston 32, there is an advantage that the filter 1 does not easily come off from the pouring / injecting device 3.

[0035]

According to the filter according to claim 1 or claim 8 or the filter according to claim 5 or claim 11, the filter used for these is very small and transparent. Since a filtration for obtaining a liquid to be measured can be easily performed, a portable and simple filter and a filter tool for measuring the concentration of a liquid can be realized.

According to the filter according to the second aspect or the filter according to the sixth aspect, the filter used in the filter is such that the front end of the MF hollow fiber membrane is an inlet opening at the front end of the guide means. Is located farther back than
It is possible to provide a filter and a filter tool in which the F hollow fiber membrane is hardly stained and the operation of collecting the liquid to be measured is easy.

According to the filter according to the third or ninth aspect or the filter according to the seventh or twelfth aspect, the MF hollow fiber membrane of the filter used for the filter is closed by the MF hollow fiber. Since it is performed by bending the yarn membrane, it does not require equipment such as welding equipment or separate materials such as adhesives,
In addition, since the operation is easy, it is possible to provide a low-cost filter and filter.

According to the concentration measuring system of the fourth or tenth aspect, the filtering tool used in this system is very small and can easily perform filtration for obtaining a transparent liquid to be measured. A portable and simple concentration measurement system can be realized.

[Brief description of the drawings]

FIG. 1 is a front view of a first filter of a first embodiment.

FIG. 2 is a longitudinal sectional view of a first filtering device used for the first filtering device.

FIG. 3 is a longitudinal sectional view of another embodiment of the first filtering device.

FIG. 4 is a longitudinal sectional view of another embodiment of the first filtering device.

FIG. 5 is a longitudinal sectional view of another embodiment of the method for closing the tip of the MF hollow fiber membrane of the first filtering device.

FIG. 6 is a longitudinal sectional view of another embodiment of the method for closing the tip of the MF hollow fiber membrane of the first filtering device.

FIG. 7 is a diagram illustrating the use of the portable densitometer in the first embodiment.

FIG. 8 is an example of a visual field of an eyepiece of a portable densitometer when the first filter is used.

FIG. 9 is an example of a visual field of an eyepiece of a portable densitometer when the first filter is not used.

FIG. 10 shows a second filter used in the second filter of the second embodiment.
Longitudinal section of the filter

FIG. 11 is a diagram illustrating the use of a portable densitometer in the second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st filtration tool 3 Dispenser 4 Portable densitometer 6 2nd filtration tool 11 MF hollow fiber membrane 12 Connecting pipe 13 Guide pipe 14 MF hollow fiber membrane fixing part 15 MF hollow fiber membrane closed end 16 MF hollow fiber Membrane base end opening 17 MF hollow fiber membrane internal space 18 Inlet 19 Introduction space 20 Connecting pipe internal space 31 Cylinder 32 Piston 33 Cylinder tip 41 Measurement liquid adhesion surface 42 Measurement liquid protection plate 43 Measurement liquid 44 Eyepiece 51 thread 61 MF hollow fiber membrane 63 guide tube 64 MF hollow fiber membrane fixed part 65 MF hollow fiber membrane closed end 66 MF hollow fiber membrane opening 67 MF hollow fiber membrane internal space 68 guide tube tip 69 introduction space 70 connection opening

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G059 AA01 BB04 BB11 CC20 EE01 KK07 KK10 4D006 GA07 HA03 JA19A JA52A KA17 KA72 KB30 LA10 MA01 MB02 PA10 PB15 PC01 PC17 PC38

Claims (12)

[Claims] 1. An injecting / injecting device having a piston and a cylinder, and a filter, wherein the filter has a closed end at a tip, has an outer surface serving as a suction surface of a liquid to be measured, and has a hollow shape. An MF hollow fiber membrane for discharging the liquid to be measured out of the membrane from an opening provided at the base end through the internal space, and a detachable connection between the base end opening of the MF hollow fiber membrane and the tip of the pouring / injecting device. Connecting means for connecting, from the connecting means toward the tip of the MF hollow fiber membrane,
A tubular guide means extending so as to surround the MF hollow fiber membrane, and having a leading end opening positioned near the closed end of the MF hollow fiber membrane and having this opening as an inlet for the liquid to be measured; vessel. 2. The filter according to claim 1, wherein a closed end of the MF hollow fiber membrane is located on a deeper side than an open end of the guide means. 3. The MF hollow fiber membrane is bent to form the MF hollow fiber membrane.
3. The filter according to claim 1, wherein a closed end of the hollow fiber membrane is formed. 4. A concentration measuring system comprising the filter according to claim 1, and a portable densitometer using a measuring method based on visual observation of transmitted light of a liquid to be measured. 5. A closed end at the tip, an outer surface serving as a suction surface of the liquid to be measured, and discharging the liquid to be measured out of the membrane through an opening provided at a base end through a hollow internal space. MF
A hollow fiber membrane, connecting means for detachably connecting the base end opening of the MF hollow fiber membrane and the tip of the infusion device, and from the connecting means toward the tip of the MF hollow fiber membrane,
A tubular guide means extending so as to surround the MF hollow fiber membrane, and having a leading end opening positioned near the closed end of the MF hollow fiber membrane and having this opening as an inlet for the liquid to be measured; Utensils. 6. The filter according to claim 5, wherein a closed end of the MF hollow fiber membrane is located at a position deeper than an open end of the guide means. 7. The filter according to claim 5, wherein the MF hollow fiber membrane is bent to form a closed end of the MF hollow fiber membrane. 8. An injecting device having a piston and a cylinder, and a filtering device, wherein the filtering device has a closed end on a side close to the injecting device, and sucks a liquid to be measured on an outer surface. A MF hollow fiber membrane that discharges the liquid to be measured out of the membrane from an opening provided farther from the closed end through a hollow internal space that is a surface, and an MF hollow fiber membrane on the inner peripheral surface. Surrounding the MF hollow fiber membrane, the tube end provided with the opening is supported at one end while the tube end is sealed between the tube end and the outer peripheral surface, and the tip of the pouring and dispensing device is detachable at the other end. A connection opening is provided for connecting the liquid to be measured, which is discharged from the pouring and injecting device, to the outside of the MF hollow fiber membrane through a closed space formed between the MF hollow fiber membrane and the outer surface of the MF hollow fiber membrane. A filter comprising tubular guide means for guiding to a surface. 9. The MF hollow fiber membrane is bent to form the MF
The filter according to claim 8, wherein a closed end of the hollow fiber membrane is formed. 10. A concentration measuring system comprising the filter according to claim 8 and a portable densitometer using a measuring method by visual observation of transmitted light of a liquid to be measured. 11. A closed end on a side close to the pouring / injecting device, an outer surface serving as a suction surface of a liquid to be measured, and provided on a far side from the closed end through a hollow internal space. An MF hollow fiber membrane for discharging the liquid to be measured out of the membrane from an opening, a pipe end surrounding the MF hollow fiber membrane on the inner peripheral surface, and a pipe end provided with the opening of the MF hollow fiber membrane; The outer peripheral surface is sealed at one end and supported at one end, and the other end is provided with a connection opening for detachably connecting the tip of the pouring / injecting device, and between the outer surface of the MF hollow fiber membrane and the opening. A filter tool comprising a tubular guiding means for guiding a liquid to be measured which is poured out of the pouring / injecting device through the formed closed space to the outer surface of the MF hollow fiber membrane. 12. The MF hollow fiber membrane is bent to form the MF
The filter device according to claim 11, wherein a closed end of the hollow fiber membrane is formed.